Analysis OP313 Dec 2023 ToO
Contents
General information
- 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
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).
Data-taking information
- 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 | 4-6 | - | - | ||
| 2024-01-19 | 16412, 16413, 16414, 16415 | 5-30 | - | - | ||
| 2024-01-21 | 16418, 16419, 16420 | 4-8 | - | - |
Fast Analysis (Daniel Morcuende)
Fast Analysis (Jorge Otero)
Standard MC dark analysis
-Zd~30-54 deg
-MC prod: 20230901_v0.10.4_allsky_base_prod/…/dec_3476
- Theta2 plots
- 10-14 December (ATel plot)
Energy dependent cuts: 0.6gh efficiency, 0.7theta efficiency
- All data stacked (10 December 2023 - 09 January 2024)
Energy dependent cuts: 0.5gh efficiency, 0.7theta efficiency (maximum theta cut restricted to 0.2 to avoid ON-OFF overlapping in post-DL3 analysis)
Different energy bins:
- SED
- Assuming power law spectral shape
-alpha=3.95 +/- 0.16
-f0=(1.36 +/- 0.21)e-12 GeV-1 cm-2 s-1
-E0=100 GeV (fixed)
- Assuming power law spectral shape with an exponential cut-off
- Lightcurve
!!!Light curve needs to be checked carefully. The adopted spectral shape has a large impact on the resulting integral flux!!!!!
Fast Analysis (Seiya Nozaki)
- 2023-12-10
- run 15973, 15974, 15975, 15976, 15977, 15978
- standard MC (dark)
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)
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)
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)
- 2023-12-14
- run 16114, 16115, 16116, 16117, 16118, 16119
- standard MC (dark)
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)
- 2023-12-16
- run 16188, 16189, 16190, 16191, 16192, 16193
- standard MC (dark)
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)
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)
File:OP313 20240109 srcdep g07 i50 stacked Nozaki.png intensity>50, gammaness>0.7 (stacked) |
Fast Analysis (Joshua Baxter)
- 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 %
- 2023-12-16
- Run Number: [16187, 16188, 16189, 16190, 16191, 16192, 16193]
gamma efficiency = 50 %, theta = 68 %
Fermi LAT
Mireia
David
Analysis time range
tmin = 723081605. tmax = 725846405.
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)
Corresponding SED
