Difference between revisions of "Analysis OP313 Dec 2023 ToO"

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* https://www.astronomerstelegram.org/?read=16381
 
* https://www.astronomerstelegram.org/?read=16381
  
−
The Large-Sized Telescope (LST-1) on La Palma has been monitoring the very distant Flat Spectrum Radio Quasar (FSRQ) OP 313 (z=0.997, Schneider et al. 2010, AJ, 139, 2360)  
+
The Large-Sized Telescope (LST-1) on La Palma has been monitoring the very distant Flat Spectrum Radio Quasar (FSRQ)  
−
  since November 2023. Following the announcement of enhanced gamma-ray emission by Fermi-LAT (ATel #16356) and several optical facilities (ATel #16360) in early December,  
+
OP 313 (z=0.997, Schneider et al. 2010, AJ, 139, 2360)  since November 2023. Following the announcement of enhanced  
−
  the Fermi-LAT emission of OP 313 has been closely monitored using the FlaapLUC pipeline (Astronomy and Computing, Volume 22, p. 9-15, 2018). This monitoring revealed the  
+
gamma-ray emission by Fermi-LAT (ATel #16356) and several optical facilities (ATel #16360) in early December,  the Fermi-
−
  detection of renewed activity in the high-energy (HE, E>100 MeV) band and so, Target of Opportunity observations with LST-1 were triggered on December 10th 2023. OP 313  
+
LAT emission of OP 313 has been closely monitored using the FlaapLUC pipeline (Astronomy and Computing, Volume 22,  
−
  was detected by LST-1 with a preliminary offline analysis using data from 2023/12/11 to 2023/12/14. It was detected with a significance greater than 5 sigma and an integrated  
+
p. 9-15, 2018). This monitoring revealed the  detection of renewed activity in the high-energy (HE, E>100 MeV) band and  
−
flux, above 100 GeV, at 15% flux of the Crab Nebula. LST-1 observations on OP 313 will continue during the next few nights and therefore multi-wavelength observations are highly  
+
so, Target of Opportunity observations with LST-1 were triggered on December 10th 2023. OP 313  was detected by LST-1  
−
  encouraged. LST-1 is a prototype of the Large-Sized Telescope for the Cherenkov Telescope Array Observatory, and is located on the Canary island of La Palma, Spain.
+
with a preliminary offline analysis using data from 2023/12/11 to 2023/12/14. It was detected with a significance greater than  
−
The telescope design is optimized for observation of gamma rays in the range from 20 GeV to 3 TeV. The preliminary offline analysis has been performed by Daniel Morcuende (dmorcuende@iaa.es),
+
5 sigma and an integrated flux, above 100 GeV, at 15% flux of the Crab Nebula. LST-1 observations on OP 313 will continue  
−
Jorge Otero-Santos (joteros@iaa.es) and Seiya Nozaki (nozaki@mpp.mpg.de). The LST-1 contact persons for these observations are Masahiro Teshima (mteshima@mpp.mpg.de) and Juan Cortina (juan.cortina@ciemat.es).
+
during the next few nights and therefore multi-wavelength observations are highly  encouraged. LST-1 is a prototype of the  
 +
Large-Sized Telescope for the Cherenkov Telescope Array Observatory, and is located on the Canary island of La Palma, Spain.
 +
The telescope design is optimized for observation of gamma rays in the range from 20 GeV to 3 TeV. The preliminary offline  
 +
analysis has been performed by Daniel Morcuende (dmorcuende@iaa.es), Jorge Otero-Santos (joteros@iaa.es) and Seiya Nozaki  
 +
(nozaki@mpp.mpg.de). The LST-1 contact persons for these observations are Masahiro Teshima (mteshima@mpp.mpg.de) and
 +
Juan Cortina (juan.cortina@ciemat.es).
  
−
==Data-taking information==
+
== Meeting ==
 +
* Kickoff meeting (19 Jan 2024): https://indico.cta-observatory.org/event/5330/
 +
* meeting 02 February 2024: https://indico.cta-observatory.org/event/5379/
 +
* meeting 16 February 2024: https://indico.cta-observatory.org/event/5412/
 +
 
 +
==Data-taking information and data quality selection==
 
* observation summary
 
* observation summary
 
{| class="wikitable"
 
{| class="wikitable"
 
| Date || Runs || time (h)|| Zd || Az || Transmission || Comments  
 
| Date || Runs || time (h)|| Zd || Az || Transmission || Comments  
 
|-
 
|-
−
| 2023-12-09 || 15942, 15943, 15944, 15945 || 1.31 || 35-53  || - || - || 50-sec shifted timestamp
+
| 2023-12-09 || 15942, 15943, 15944, 15945 || 1.31 || 35-53  || - || - || 50-sec shifted timestamp -> solved!
 
|-
 
|-
 
| 2023-12-10 || 15973, 15974, 15975, 15976, 15977, 15978 || 1.61 || 30-51 || - || - ||   
 
| 2023-12-10 || 15973, 15974, 15975, 15976, 15977, 15978 || 1.61 || 30-51 || - || - ||   
Line 36: Line 46:
 
| 2023-12-14 || 16114, 16115, 16116, 16117, 16118, 16119|| 1.60 || 30-52  || - || - ||   
 
| 2023-12-14 || 16114, 16115, 16116, 16117, 16118, 16119|| 1.60 || 30-52  || - || - ||   
 
|-
 
|-
−
| 2023-12-15 || 16150, 16151, 16152, 16153, 16154, 16155, 16156, 16157 || 1.75 || 30-52  || - || - ||   
+
| 2023-12-15 || 16150, 16151, 16152, 16153, 16154, 16155, 16156, 16157* || 1.75 || 30-52  || - || - ||  No tracking during run 16157
 
|-
 
|-
−
| 2023-12-16 || 16188, 16189, 16190, 16191, 16192, 16193 || ||  25-52 || - || - || Drive issue during run 16190 (no tracking)  
+
| 2023-12-16 || 16188, 16189, 16190*, 16191, 16192, 16193 || 1.67 ||  25-52 || - || - || Drive issue during run 16190 (no tracking)  
 
|-
 
|-
−
| 2023-12-17 || 16220, 16221, 16222, 16223, 16224, 16225 || ||  25-50 || - || - ||   
+
| 2023-12-17 || 16220, 16221, 16222, 16223, 16224, 16225 || 1.72 ||  25-50 || - || - ||   
 
|-
 
|-
 
| 2023-12-18 || 16240, 16241, 16242, 16243, 16244, 16246 ||  ||  25-50 || - || - || online gain-selected data
 
| 2023-12-18 || 16240, 16241, 16242, 16243, 16244, 16246 ||  ||  25-50 || - || - || online gain-selected data
Line 47: Line 57:
 
|-
 
|-
 
| 2023-12-20 || 16269, 16270 ||  ||  40-43 || - || - ||  online gain-selected data, humidity is rising during run 16270
 
| 2023-12-20 || 16269, 16270 ||  ||  40-43 || - || - ||  online gain-selected data, humidity is rising during run 16270
 +
|-
 +
| 2024-01-09 || 16293, 16294, 16295 || 0.63 ||  20-26 || - || - || 
 +
|-
 +
| 2024-01-13 || 16350, 16351, 16352, 16353, 16354, 16355, 16356, 16357, 16358, 16359 || 2.08 ||  15-43 || - || - || 
 +
|-
 +
| 2024-01-17 || 16391, 16392 || 0.46 ||  25-30 || - || - || Timestamp is shifted?? -> solved!
 +
|-
 +
| 2024-01-18 || 16407 ||0.10 || 4-6 || - || - ||
 +
|-
 +
| 2024-01-19 || 16412, 16413, 16414, 16415 || 1.34 || 5-30 || - || - ||
 +
|-
 +
| 2024-01-21 || 16418, 16419, 16420 || 0.70 || 4-8 || - || - ||
 
|}
 
|}
  
−
== Fast Analysis (Daniel Morcuende) ==
+
Final data quality selection (using the latest notebook, default settings + min_drdi_at_422pe = 1.2  instead of the default 1.5 to recover 1.7 h from January 2024 where we are limited by low statistic)
 +
 
 +
'2023-12-09': [15942, 15943, 15944, 15945],
 +
'2023-12-10': [15975, 15976, 15977, 15978],
 +
'2023-12-11': [16007, 16008, 16009, 16010],
 +
'2023-12-12': [16042, 16043, 16044, 16045],
 +
'2023-12-13': [16079, 16080, 16081, 16082, 16083],
 +
'2023-12-14': [16114, 16116, 16117, 16118, 16119],
 +
'2023-12-15': [16150, 16151, 16152, 16153, 16154, 16155, 16156],
 +
'2023-12-16': [16188, 16189, 16191, 16192, 16193],
 +
'2023-12-17': [16220, 16221, 16222, 16223, 16224, 16225],
 +
'2023-12-18': [16240, 16241, 16242, 16243, 16244, 16246],
 +
'2024-01-09': [16293, 16294, 16295],
 +
'2024-01-13': [16350, 16351, 16352, 16353, 16354, 16356, 16357, 16358, 16359],
 +
'2024-01-17': [16391, 16392],
 +
'2024-01-19': [16412, 16413, 16414, 16415],
 +
'2024-01-21': [16418, 16419, 16420]
 +
 
 +
== Analysis 1 (Daniel Morcuende) ==
  
 
[[File:OP313_20231213_Morcuende.png|thumb|centre|600px|Src-independent analysis, Gammaness cut efficiency of 40%, Theta containment 70%, 3 OFF positions, theta2 cut at 0.04 deg2]]
 
[[File:OP313_20231213_Morcuende.png|thumb|centre|600px|Src-independent analysis, Gammaness cut efficiency of 40%, Theta containment 70%, 3 OFF positions, theta2 cut at 0.04 deg2]]
  
−
== Fast Analysis (Jorge Otero) ==
+
== Analysis 2 (Jorge Otero) ==
  
 
Standard MC dark analysis
 
Standard MC dark analysis
 +
 +
Source independent analysis
 +
 +
-Zd~15-54 deg
 +
 +
-MC prod: 20230901_v0.10.4_allsky_base_prod/…/dec_3476
 +
 +
-3 OFFs
 +
 +
-Safe mask > 5% max. Aeff → Fit energy range: [70 GeV, 1 TeV]
 +
 +
A Crab Nebula analysis sanity check for the same nights as OP 313 can be checked here: https://www.lst1.iac.es/wiki/index.php/Crab_Sanity_check_JorgeOtero.
 +
 
* Theta2 plots
 
* Theta2 plots
−
** 10-14 December
 
−
Energy dependent cuts: 0.6gh efficiency, 0.7theta efficiency
 
−
[[File:OP313_20231213_Otero.png|thumb|centre|400px|energy dependent cuts (0.6gh efficiency, 0.7theta efficiency), interpolated IRFs]]
 
  
−
** 11-14 December
+
Energy dependent cuts: 0.7gh efficiency, 0.7theta efficiency
−
Global fixed cuts: 0.7 gammaness, 0.2 theta
+
(maximum theta cut restricted to 0.2 to avoid ON-OFF overlapping in post-DL3 analysis)
−
[[File:OP313_20231211-20231214_global_Otero.png|thumb|centre|400px|global fixed cuts (0.7 gammaness, 0.2 theta), interpolated IRFs]]
+
{| align='center'
 +
| [[File:OP313_20231209-20240121_endep_Otero.png|thumb|centre|400px|energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs (all Dec.+Jan. data)]] 
 +
| [[File:OP313_20231209-20231220_endep_high_Otero.png|thumb|centre|400px|energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs, high state (Dec. 2023)]] 
 +
| [[File:OP313_20240109-20240121_endep_low_Otero.png|thumb|centre|400px|energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs, low state (Jan. 2024)]] 
 +
|}
 +
 
 +
Different energy bins:
 +
[[File:OP313_20231209-20240121_endep_binned_Otero.png|thumb|centre|800px|energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs]]
 +
 
 +
Nightwise theta2 plots:
 +
{| align='center'
 +
| [[File:OP313_20231209_endep_binned_Otero.png|thumb|centre|400px|2023-12-09, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs]]
 +
| [[File:OP313_20231210_endep_binned_Otero.png|thumb|centre|400px|2023-12-10, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs]]
 +
| [[File:OP313_20231211_endep_binned_Otero.png|thumb|centre|400px|2023-12-11, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs]]
 +
|}
 +
{| align='center'
 +
| [[File:OP313_20231212_endep_binned_Otero.png|thumb|centre|400px|2023-12-12, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs]]
 +
| [[File:OP313_20231213_endep_binned_Otero.png|thumb|centre|400px|2023-12-13, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs]]
 +
| [[File:OP313_20231214_endep_binned_Otero.png|thumb|centre|400px|2023-12-14, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs]]
 +
|}
 +
{| align='center'
 +
| [[File:OP313_20231215_endep_binned_Otero.png|thumb|centre|400px|2023-12-15, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs]]
 +
| [[File:OP313_20231216_endep_binned_Otero.png|thumb|centre|400px|2023-12-16, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs]]
 +
| [[File:OP313_20231217_endep_binned_Otero.png|thumb|centre|400px|2023-12-17, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs]]
 +
|}
 +
{| align='center'
 +
| [[File:OP313_20231218_endep_binned_Otero.png|thumb|centre|400px|2023-12-18, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs]]
 +
| [[File:OP313_20240109_endep_binned_Otero.png|thumb|centre|400px|2024-01-09, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs]]
 +
| [[File:OP313_20240113_endep_binned_Otero.png|thumb|centre|400px|2024-01-13, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs]]
 +
|}
 +
{| align='center'
 +
| [[File:OP313_20240117_endep_binned_Otero.png|thumb|centre|400px|2024-01-17, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs]]
 +
| [[File:OP313_20240119_endep_binned_Otero.png|thumb|centre|400px|2024-01-19, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs]]
 +
| [[File:OP313_20240121_endep_binned_Otero.png|thumb|centre|400px|2024-01-21, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs]]
 +
|}
 +
 
 +
* SED
 +
 
 +
Assuming a PWL+EBL spectral model (Saldana-Lopez 2021 EBL model):
 +
{| align='center'
 +
| [[File:OP313_20231209-20231218_SED_powerlaw_EBL_SL21_Otero.png|thumb|centre|400px|energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs, high state (Dec. 2023)]]
 +
| [[File:OP313_20240109-20240121_SED_powerlaw_Otero.png|thumb|centre|400px|energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs, low state (Jan. 2024)]]
 +
|}
  
−
** All data stacked (10-17 December)
+
Spectral parameters for the high state (December 2023):
 +
F0=(1.15 土 0.13)・10e-11 TeV-1 cm-2 s-1
 +
alpha=2.07 土 0.51
 +
E0=100 GeV
 +
 
 +
Spectral parameters for the low state (January 2024):
 +
F0=(2.6 土 2.5)・10e-12 TeV-1 cm-2 s-1
 +
alpha=2.4 土 1.4
 +
E0=450 GeV
  
 
* Lightcurve
 
* Lightcurve
−
* SED
 
  
−
== Fast Analysis (Seiya Nozaki) ==
+
Complete lightcurve above 100 GeV assuming the SED obtained for the high state in December 2023:
 +
[[File:OP313_20231209-20240121_LC_DecJan_Otero.png|thumb|centre|600px|Daily binned lightcurve above 100GeV, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs]]
 +
 
 +
Average flux:
 +
F=(4.69 土 0.10)・10e-11 cm-2 s-1 = 10% Crab Nebula flux
 +
 
 +
Separating high and low state:
 +
{| align='center'
 +
| [[File:OP313_20231209-20231218_LC_Dec_Otero.png|thumb|centre|600px|Daily-binned lightcurve above 100GeV, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs, high state (Dec. 2023)]]
 +
| [[File:OP313_20240109-20240121_LC_Jan_Otero.png|thumb|centre|600px|Daily-binned lightcurve above 100GeV, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs, low state (Jan. 2024)]]
 +
|}
 +
 
 +
Average flux for the high state (December 2023):
 +
F=(1.35 土 0.19)・10e-10 cm-2 s-1 = 28.3% Crab Nebula flux
 +
 
 +
Average flux for the low state (January 2024) compatible with 0 flux.
 +
 
 +
== Analysis 3 (Seiya Nozaki) ==
 +
Standard MC dark analysis
 +
 
 +
Source dependent analysis
 +
 
 +
-Zd~15-54 deg
 +
 
 +
-MC prod: 20230901_v0.10.4_allsky_base_prod/…/dec_3476
 +
 
 +
* 2023-12-09
 +
** run 15942, 15943, 15944, 15945
 +
** '''standard MC (dark)'''
 +
{| align='center'
 +
| [[File:OP313_20231209_srcdep_g07_i50_Nozaki.png|thumb|centre|400px|intensity>50, gammaness>0.7]]
 +
| [[File:OP313_20231209_srcdep_g08_i150_Nozaki.png|thumb|centre|400px|intensity>150, gammaness>0.8]]
 +
|}
 +
 
 +
 
 +
 
 
* 2023-12-10
 
* 2023-12-10
 
** run 15973, 15974, 15975, 15976, 15977, 15978
 
** run 15973, 15974, 15975, 15976, 15977, 15978
Line 123: Line 257:
 
| [[File:OP313_20231215_srcdep_g06_i50_Nozaki.png|thumb|centre|400px|intensity>50, gammaness>0.6]]
 
| [[File:OP313_20231215_srcdep_g06_i50_Nozaki.png|thumb|centre|400px|intensity>50, gammaness>0.6]]
 
|}
 
|}
 +
 +
* 2023-12-16
 +
** run 16188, 16189, 16190, 16191, 16192, 16193
 +
** '''standard MC (dark)'''
 +
{| align='center'
 +
| [[File:OP313_20231216_srcdep_g07_i50_Nozaki.png|thumb|centre|400px|intensity>50, gammaness>0.7]]
 +
| [[File:OP313_20231216_srcdep_g07_i50_stacked_Nozaki.png|thumb|centre|400px|intensity>50, gammaness>0.7 (stacked)]]
 +
|}
 +
 +
* 2023-12-17
 +
** run 16220, 16221, 16222, 16223, 16224, 16225
 +
** '''standard MC (dark)'''
 +
{| align='center'
 +
| [[File:OP313_20231217_srcdep_g07_i50_Nozaki.png|thumb|centre|400px|intensity>50, gammaness>0.7]]
 +
| [[File:OP313_20231217_srcdep_g07_i50_stacked_Nozaki.png|thumb|centre|400px|intensity>50, gammaness>0.7 (stacked)]]
 +
|}
 +
 +
* 2024-01-09
 +
** run 16293, 16294, 16295
 +
** '''standard MC (dark)'''
 +
{| align='center'
 +
| [[File:OP313_20240109_srcdep_g07_i50_Nozaki.png|thumb|centre|400px|intensity>50, gammaness>0.7]]
 +
| [[File:OP313_20240109_srcdep_g07_i50_stacked_Nozaki.png|thumb|centre|400px|intensity>50, gammaness>0.7 (stacked)]]
 +
|}
 +
 +
== Crosschecks of plots to be approved ==
 +
 +
ADD HERE SEDs AND LCs OF DANIEL, SEIYA AND JORGE PLOTTED ALL TOGETHER
  
 
== Fast Analysis (Joshua Baxter) ==
 
== Fast Analysis (Joshua Baxter) ==
Line 146: Line 308:
 
| [[File:theta2_op313_dec16.png|thumb|centre|400px|intensity>50, gamma efficiency = 50 % (Dec 16th)]]
 
| [[File:theta2_op313_dec16.png|thumb|centre|400px|intensity>50, gamma efficiency = 50 % (Dec 16th)]]
 
| [[File:theta2_dec14_to_16.png|thumb|centre|400px|intensity>50, gamma efficiency = 50 % (Dec 14th-16th 3 days stacked)]]
 
| [[File:theta2_dec14_to_16.png|thumb|centre|400px|intensity>50, gamma efficiency = 50 % (Dec 14th-16th 3 days stacked)]]
 +
|}
 +
 +
 +
 +
== Fast Analysis (Elisa Visentin) ==
 +
 +
Joint runs: 2023/12/09, 2023/12/10, 2023/12/11, 2023/12/14, 2023/12/15, 2023/12/16, 2023/12/17, 2023/12/18, 2024/01/09
 +
 +
gamma efficiency 90%, theta cut 0.2 deg, MAGIC intensity > 30 pe, LST intensity > 50 pe
 +
Data selection: LST runs where > 3 minutes of stereo joint data taking
 +
 +
{| align='center'
 +
| [[File:LC_high_EV.jpg]]
 +
| [[File:LC_low_EV.jpg]]
 +
|}
 +
{| align='center'
 +
| [[File:Theta2 all EV.jpg]]
 +
| [[File:Theta2 E EV.jpg]]
 +
|}
 +
{| align='center'
 +
| [[File:Significance_EV.jpg]]
 +
|}
 +
{| align='center'
 +
| [[File:SED_EV.jpg]]
 
|}
 
|}
  
Line 155: Line 341:
  
 
=== David ===
 
=== David ===
 +
 +
 +
Analysis time range
 +
 +
tmin = 723081605.
 +
tmax = 725846405.
 +
 +
 +
[[File:OP313_LC_3daybin_20240108.png|thumb|centre|400px]]
 +
 +
[[File:OP313_LC_daybin_20240108.png|thumb|centre|400px]]
 +
 +
 +
Older analysis
  
 
3 hours bin LC from tmin = 723956405.0 (2023-12-11 03:00:00.000) to tmax = 724550405.000 (2023-12-18 00:00:00.000)
 
3 hours bin LC from tmin = 723956405.0 (2023-12-11 03:00:00.000) to tmax = 724550405.000 (2023-12-18 00:00:00.000)

Latest revision as of 13:52, 19 February 2024

Media:Example.ogg

General information[edit]

  • Name of the source: OP313
  • Brief description of the source:
- Object type : FSRQ
- Redshift : z=0.997 (Schneider et al. 2010, AJ, 139, 2360)

Atel[edit]

The Large-Sized Telescope (LST-1) on La Palma has been monitoring the very distant Flat Spectrum Radio Quasar (FSRQ) OP 313 (z=0.997, Schneider et al. 2010, AJ, 139, 2360) since November 2023. Following the announcement of enhanced gamma-ray emission by Fermi-LAT (ATel #16356) and several optical facilities (ATel #16360) in early December, the Fermi- LAT emission of OP 313 has been closely monitored using the FlaapLUC pipeline (Astronomy and Computing, Volume 22, p. 9-15, 2018). This monitoring revealed the detection of renewed activity in the high-energy (HE, E>100 MeV) band and so, Target of Opportunity observations with LST-1 were triggered on December 10th 2023. OP 313 was detected by LST-1 with a preliminary offline analysis using data from 2023/12/11 to 2023/12/14. It was detected with a significance greater than 5 sigma and an integrated flux, above 100 GeV, at 15% flux of the Crab Nebula. LST-1 observations on OP 313 will continue during the next few nights and therefore multi-wavelength observations are highly encouraged. LST-1 is a prototype of the Large-Sized Telescope for the Cherenkov Telescope Array Observatory, and is located on the Canary island of La Palma, Spain. The telescope design is optimized for observation of gamma rays in the range from 20 GeV to 3 TeV. The preliminary offline analysis has been performed by Daniel Morcuende (dmorcuende@iaa.es), Jorge Otero-Santos (joteros@iaa.es) and Seiya Nozaki (nozaki@mpp.mpg.de). The LST-1 contact persons for these observations are Masahiro Teshima (mteshima@mpp.mpg.de) and Juan Cortina (juan.cortina@ciemat.es).

Meeting[edit]

Data-taking information and data quality selection[edit]

  • observation summary
Date Runs time (h) Zd Az Transmission Comments
2023-12-09 15942, 15943, 15944, 15945 1.31 35-53 - - 50-sec shifted timestamp -> solved!
2023-12-10 15973, 15974, 15975, 15976, 15977, 15978 1.61 30-51 - -
2023-12-11 16007, 16008, 16009, 16010, 16011 1.39 30-54 - -
2023-12-12 16042, 16043, 16044, 16045, 16046 1.63 30-54 - -
2023-12-13 16079, 16080, 16081, 16082, 16083 1.69 30-53 - -
2023-12-14 16114, 16115, 16116, 16117, 16118, 16119 1.60 30-52 - -
2023-12-15 16150, 16151, 16152, 16153, 16154, 16155, 16156, 16157* 1.75 30-52 - - No tracking during run 16157
2023-12-16 16188, 16189, 16190*, 16191, 16192, 16193 1.67 25-52 - - Drive issue during run 16190 (no tracking)
2023-12-17 16220, 16221, 16222, 16223, 16224, 16225 1.72 25-50 - -
2023-12-18 16240, 16241, 16242, 16243, 16244, 16246 25-50 - - online gain-selected data
2023-12-19 16258, 16259, 16260, 16261, 16262, 16263 25-50 - - online gain-selected data
2023-12-20 16269, 16270 40-43 - - online gain-selected data, humidity is rising during run 16270
2024-01-09 16293, 16294, 16295 0.63 20-26 - -
2024-01-13 16350, 16351, 16352, 16353, 16354, 16355, 16356, 16357, 16358, 16359 2.08 15-43 - -
2024-01-17 16391, 16392 0.46 25-30 - - Timestamp is shifted?? -> solved!
2024-01-18 16407 0.10 4-6 - -
2024-01-19 16412, 16413, 16414, 16415 1.34 5-30 - -
2024-01-21 16418, 16419, 16420 0.70 4-8 - -

Final data quality selection (using the latest notebook, default settings + min_drdi_at_422pe = 1.2 instead of the default 1.5 to recover 1.7 h from January 2024 where we are limited by low statistic) 

'2023-12-09': [15942, 15943, 15944, 15945],
'2023-12-10': [15975, 15976, 15977, 15978],
'2023-12-11': [16007, 16008, 16009, 16010],
'2023-12-12': [16042, 16043, 16044, 16045],
'2023-12-13': [16079, 16080, 16081, 16082, 16083],
'2023-12-14': [16114, 16116, 16117, 16118, 16119],
'2023-12-15': [16150, 16151, 16152, 16153, 16154, 16155, 16156],
'2023-12-16': [16188, 16189, 16191, 16192, 16193],
'2023-12-17': [16220, 16221, 16222, 16223, 16224, 16225],
'2023-12-18': [16240, 16241, 16242, 16243, 16244, 16246],
'2024-01-09': [16293, 16294, 16295],
'2024-01-13': [16350, 16351, 16352, 16353, 16354, 16356, 16357, 16358, 16359],
'2024-01-17': [16391, 16392],
'2024-01-19': [16412, 16413, 16414, 16415],
'2024-01-21': [16418, 16419, 16420]

Analysis 1 (Daniel Morcuende)[edit]

Src-independent analysis, Gammaness cut efficiency of 40%, Theta containment 70%, 3 OFF positions, theta2 cut at 0.04 deg2

Analysis 2 (Jorge Otero)[edit]

Standard MC dark analysis

Source independent analysis

-Zd~15-54 deg

-MC prod: 20230901_v0.10.4_allsky_base_prod/…/dec_3476

-3 OFFs

-Safe mask > 5% max. Aeff → Fit energy range: [70 GeV, 1 TeV]

A Crab Nebula analysis sanity check for the same nights as OP 313 can be checked here: https://www.lst1.iac.es/wiki/index.php/Crab_Sanity_check_JorgeOtero.

  • Theta2 plots
Energy dependent cuts: 0.7gh efficiency, 0.7theta efficiency 
(maximum theta cut restricted to 0.2 to avoid ON-OFF overlapping in post-DL3 analysis)
energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs (all Dec.+Jan. data)
energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs, high state (Dec. 2023)
energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs, low state (Jan. 2024)
Different energy bins:
energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs
Nightwise theta2 plots:
2023-12-09, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs
2023-12-10, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs
2023-12-11, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs
2023-12-12, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs
2023-12-13, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs
2023-12-14, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs
2023-12-15, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs
2023-12-16, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs
2023-12-17, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs
2023-12-18, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs
2024-01-09, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs
2024-01-13, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs
2024-01-17, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs
2024-01-19, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs
2024-01-21, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs
  • SED
Assuming a PWL+EBL spectral model (Saldana-Lopez 2021 EBL model):
energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs, high state (Dec. 2023)
energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs, low state (Jan. 2024)
Spectral parameters for the high state (December 2023):
F0=(1.15 土 0.13)・10e-11 TeV-1 cm-2 s-1
alpha=2.07 土 0.51
E0=100 GeV

Spectral parameters for the low state (January 2024):
F0=(2.6 土 2.5)・10e-12 TeV-1 cm-2 s-1
alpha=2.4 土 1.4
E0=450 GeV
  • Lightcurve
Complete lightcurve above 100 GeV assuming the SED obtained for the high state in December 2023:
Daily binned lightcurve above 100GeV, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs
Average flux:
F=(4.69 土 0.10)・10e-11 cm-2 s-1 = 10% Crab Nebula flux

Separating high and low state:
Daily-binned lightcurve above 100GeV, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs, high state (Dec. 2023)
Daily-binned lightcurve above 100GeV, energy dependent cuts (0.7 gammaness, 0.7 theta), interpolated IRFs, low state (Jan. 2024)
Average flux for the high state (December 2023):
F=(1.35 土 0.19)・10e-10 cm-2 s-1 = 28.3% Crab Nebula flux

Average flux for the low state (January 2024) compatible with 0 flux.

Analysis 3 (Seiya Nozaki)[edit]

Standard MC dark analysis

Source dependent analysis

-Zd~15-54 deg

-MC prod: 20230901_v0.10.4_allsky_base_prod/…/dec_3476

  • 2023-12-09
    • run 15942, 15943, 15944, 15945
    • standard MC (dark)
intensity>50, gammaness>0.7
intensity>150, gammaness>0.8


  • 2023-12-10
    • run 15973, 15974, 15975, 15976, 15977, 15978
    • standard MC (dark)
intensity>50, gammaness>0.7
File:OP313 20231210 srcdep g08 i150 Nozaki.png
intensity>150, gammaness>0.8
  • 2023-12-11
    • run 16007, 16008, 16009, 16010, 16011
    • standard MC (dark)
intensity>50, gammaness>0.7
intensity>50, gammaness>0.7 (stacked)
File:OP313 20231211 srcdep g08 i150 Nozaki.png
intensity>150, gammaness>0.8
  • 2023-12-12
    • run 16042, 16043, 16044, 16045, 16046
    • standard MC (dark)
intensity>50, gammaness>0.7
intensity>50, gammaness>0.7 (stacked)
File:OP313 20231212 srcdep g08 i150 Nozaki.png
intensity>150, gammaness>0.8
  • 2023-12-13
    • run 16079, 16080, 16081, 16082, 16083
    • standard MC (dark)
intensity>50, gammaness>0.7
intensity>50, gammaness>0.7 (stacked)
intensity>150, gammaness>0.8
  • 2023-12-14
    • run 16114, 16115, 16116, 16117, 16118, 16119
    • standard MC (dark)
intensity>50, gammaness>0.7
File:OP313 20231214 srcdep g07 i50 stacked Nozaki.png
intensity>50, gammaness>0.7 (stacked)
File:OP313 20231214 srcdep g08 i150 Nozaki.png
intensity>150, gammaness>0.8
  • 2023-12-15
    • run 16150, 16151, 16152, 16153, 16154, 16155, 16156, 16157
    • standard MC (dark)
intensity>50, gammaness>0.7
intensity>50, gammaness>0.7 (stacked)
intensity>50, gammaness>0.6
  • 2023-12-16
    • run 16188, 16189, 16190, 16191, 16192, 16193
    • standard MC (dark)
intensity>50, gammaness>0.7
File:OP313 20231216 srcdep g07 i50 stacked Nozaki.png
intensity>50, gammaness>0.7 (stacked)
  • 2023-12-17
    • run 16220, 16221, 16222, 16223, 16224, 16225
    • standard MC (dark)
intensity>50, gammaness>0.7
File:OP313 20231217 srcdep g07 i50 stacked Nozaki.png
intensity>50, gammaness>0.7 (stacked)
  • 2024-01-09
    • run 16293, 16294, 16295
    • standard MC (dark)
intensity>50, gammaness>0.7
File:OP313 20240109 srcdep g07 i50 stacked Nozaki.png
intensity>50, gammaness>0.7 (stacked)

Crosschecks of plots to be approved[edit]

ADD HERE SEDs AND LCs OF DANIEL, SEIYA AND JORGE PLOTTED ALL TOGETHER

Fast Analysis (Joshua Baxter)[edit]

  • 2023-12-14
    • Run Number: [16114, 16115, 16116, 16117, 16118, 16119]

gamma efficiency = 50 %, theta = 68 %

  • 2023-12-15
    • Run Number: [16150, 16151, 16152, 16153, 16154, 16155, 16156, 16157]

gamma efficiency = 50 %, theta = 68 %

intensity>50, gamma efficiency = 50 % (Dec 14-15th 2 days stacked)
intensity>50, gamma efficiency = 50 % (Dec 14th)
intensity>50, gamma efficiency = 50 % (Dec 15th)
  • 2023-12-16
    • Run Number: [16187, 16188, 16189, 16190, 16191, 16192, 16193]

gamma efficiency = 50 %, theta = 68 %

intensity>50, gamma efficiency = 50 % (Dec 16th)
intensity>50, gamma efficiency = 50 % (Dec 14th-16th 3 days stacked)


Fast Analysis (Elisa Visentin)[edit]

Joint runs: 2023/12/09, 2023/12/10, 2023/12/11, 2023/12/14, 2023/12/15, 2023/12/16, 2023/12/17, 2023/12/18, 2024/01/09

gamma efficiency 90%, theta cut 0.2 deg, MAGIC intensity > 30 pe, LST intensity > 50 pe Data selection: LST runs where > 3 minutes of stereo joint data taking

LC high EV.jpg LC low EV.jpg
Theta2 all EV.jpg Theta2 E EV.jpg
Significance EV.jpg
SED EV.jpg


Fermi LAT[edit]

Mireia[edit]

David[edit]

Analysis time range

tmin = 723081605. tmax = 725846405.


OP313 LC 3daybin 20240108.png
OP313 LC daybin 20240108.png


Older analysis

3 hours bin LC from tmin = 723956405.0 (2023-12-11 03:00:00.000) to tmax = 724550405.000 (2023-12-18 00:00:00.000)

OP313 LC 18dec.png

Corresponding SED

SED OP313 PowerLaw 18dec.png
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