Difference between revisions of "GRB230512A"

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Go back to [[Transient Working Group]].
 
Go back to [[Transient Working Group]].
−
Go back to [[Transient observation logbook]]
+
 
 +
Go back to [[Transient observation logbook]].
  
 
== Alert Information ==
 
== Alert Information ==
Line 45: Line 46:
 
| These are likely unrelated as they fall outside the LAT localization  
 
| These are likely unrelated as they fall outside the LAT localization  
 
| https://gcn.nasa.gov/circulars/33784
 
| https://gcn.nasa.gov/circulars/33784
 +
|-
 +
| 0.57624 d, 1.64044 d
 +
| Kitab
 +
|style="color:#FF0000" | aparent detection
 +
| 19.43, n/d (UL at 20)
 +
| A source disappeared from May 12 to May 13 in the XRT #5 error circle
 +
| https://gcn.nasa.gov/circulars/33796
 +
|-
 +
| 14.22 hours
 +
| GIT
 +
|style="color:#FF0000" | No detection
 +
| >20.39 (r), >21.08 (g')
 +
| 2x400s exposures in the r' and g' band
 +
| https://gcn.nasa.gov/circulars/33797
 +
|-
 +
| ~7.5 h
 +
| Liverpool Telescope
 +
|style="color:#FF0000" | No detection
 +
| 3-sigma limit of r’ > 22.15
 +
| We detect no source at the position of the candidate optical counterpart reported by Kitab
 +
| https://gcn.nasa.gov/circulars/33798
 +
|-
 +
| 1.003 d, 0.998 d
 +
| Zwicky Transient Facility
 +
|style="color:#FF0000" | No detection
 +
|  r , 21.02 mag; g , 20.83 mag
 +
| no sources were found up in the candidate optical counterpart reported by Kitab
 +
| https://gcn.nasa.gov/circulars/33799
 +
|-
 +
| 0.537 d, 1.543 d, 1.563 d
 +
| Nanshan/NEXT
 +
|style="color:#FF0000" | No detection
 +
|  r , 20.7 mag; r , 21.8 mag; z, 20.0 mag
 +
| No optical source is detected in our stacked images at the XRT source 5 position, it doesn't reveal the Kitab candidate although it is deeper.
 +
| https://gcn.nasa.gov/circulars/33800
 
|}
 
|}
  
 +
In the end no counterpart was detected. No counterpart was in the improved IPN triangulation (https://gcn.nasa.gov/circulars/33808)
  
 
== LST Observations ==
 
== LST Observations ==
Line 65: Line 102:
 
=== Data-taking information ===
 
=== Data-taking information ===
  
−
* Overall selected observation time:
+
* Overall selected observation time: ~ 4 h
−
* Selected runs:
+
* Selected runs: 12962 - 12973
−
* Position analyzed: ''RA, Dec''
+
* Position analyzed: ''295.4, 38.4''
  
 +
I divided the analysis between the dark analysis (12962 - 12968) and moon analysis (12969-12973) because the number of surviving pedestal for latter runs was higher than the threshold (4%) for the standard analysis. The moon raised more or less during run 12967. However, the standard cleaning seems OK until 12968.
  
 
=== DL1 data ===
 
=== DL1 data ===
  
−
Used DL1b files produced by LSTOSA
+
Used DL1ab files produced by LSTOSA
  
 
  /fefs/aswg/data/real/DL1/20230512/v0.9/tailcut84/
 
  /fefs/aswg/data/real/DL1/20230512/v0.9/tailcut84/
  
 +
For the moon analysis, I applied tighter cuts (tail cut 11, 5). Path to DL1b files for moon analysis:
 +
/fefs/aswg/workspace/arnau.aguasca/Analysis/results/real/DL2/20230512/srcind/v0.9.13/tailcut115_dynclg/AllSky_20230127_v0.9.12_base_prod_az_tel_dec_3476/
 +
 +
The config file is here:
 +
/fefs/aswg/workspace/arnau.aguasca/scripts/_configs/GRB230512A/real_config_lstchain_belong_v0.9.13_tailcut115.json
  
 
=== DL2 data ===
 
=== DL2 data ===
Line 81: Line 124:
 
* Random forest:  
 
* Random forest:  
  
−
  XXXXXXXXXXXXX
+
  /fefs/aswg/data/models/AllSky/20230127_v0.9.12_base_prod_az_tel/dec_3476/
  
−
* lstchain v0.9.12 with config file
+
* lstchain config file
−
  XXXXXXXXXXXXX
+
  /fefs/aswg/data/models/AllSky/20230127_v0.9.12_base_prod_az_tel/dec_3476/lstchain_config.json
  
  
 
=== Theta2 plot from DL2===
 
=== Theta2 plot from DL2===
  
 +
Dark analysis
 
*Cuts and parameters used:
 
*Cuts and parameters used:
 
**intensity > 50
 
**intensity > 50
−
**gammaness > 0.8
+
**gammaness > 0.7
−
**Theta2_global_cut=0.04
+
**Theta2_global_cut=0.09 (the uncertainty error of the Fermi-LAT position)
 
**leakage < 0.2
 
**leakage < 0.2
−
** norm_range_theta2_min=0.3   
 
−
** norm_range_theta2_max=0.5
 
  
 +
Moon analysis
 +
*Cuts and parameters used:
 +
**intensity > 150
 +
**gammaness > 0.7
 +
**Theta2_global_cut=0.09 (the uncertainty error of the Fermi-LAT position)
 +
**leakage < 0.2
 +
The intensity cut value is chosen close to the peak of the intensity distribution for all run in moon conditions.
 +
 +
 +
Theta2 plot for all runs:
 
{| align='center'
 
{| align='center'
−
| [[Image: Theta2_DL2_plot_GRB230512A.png |thumb|600px|center|alt=Theta2 plot for GRB130512A.|Theta2 plot for GRB230512A.]]
+
| [[Image: Theta2_DL2_plot_GRB230512A.png |thumb|600px|center|alt=Theta2 plot for GRB130512A. 3 OFF regions are used for the theta2 OFF distribution. |Theta2 plot for GRB230512A.]]
 
|}
 
|}
 +
 +
Appling BKG normalisation between
 +
** norm_range_theta2_min=0.3   
 +
** norm_range_theta2_max=0.5
 +
The significance is 0.23 sigma.
  
 
----
 
----

Latest revision as of 13:40, 26 May 2023

Go back to Transient Working Group.

Go back to Transient observation logbook.

Alert Information[edit]

  • Name/type of the alert: Name
  • GCN notice: https://gcn.nasa.gov/circulars/33778
  • Triggered by: Fermi GBM (but alert from TH by Fermi-LAT)
  • Alert coordinates (From Fermi-LAT):
    • RA: 19 41 36.00 (hh mm ss), Dec: +38 24 00.00 (dd mm ss)
    • RA, Dec in deg (ICRS): 295.4, 38.4
  • Alert arrival time: 06:27:45 UT
  • Other relevant information:
    • Redshift (z): n/a

Multi-wavelength Observations[edit]

Timeline
T0+ Instrument Outcome Outcome specific value (flux/UL/...) Comment Link
0-300 s after the GBM trigger Fermi-LAT Detection (1.0 ± 0.3) E-05 ph/cm2/s The highest-energy photon is a 1.7 GeV https://gcn.nasa.gov/circulars/33780
45.5 - 57.3 ks Swift-XRT No aparent detection Nine uncatalogued X-ray sources have been detected However none of them is above the RASS limit or shows definitive signs of fading. https://gcn.nasa.gov/circulars/33789
2 hours Zwicky Transient Facility No aparent detection Two sources were found within the 95% localization region These are likely unrelated as they fall outside the LAT localization https://gcn.nasa.gov/circulars/33784
0.57624 d, 1.64044 d Kitab aparent detection 19.43, n/d (UL at 20) A source disappeared from May 12 to May 13 in the XRT #5 error circle https://gcn.nasa.gov/circulars/33796
14.22 hours GIT No detection >20.39 (r), >21.08 (g') 2x400s exposures in the r' and g' band https://gcn.nasa.gov/circulars/33797
~7.5 h Liverpool Telescope No detection 3-sigma limit of r’ > 22.15 We detect no source at the position of the candidate optical counterpart reported by Kitab https://gcn.nasa.gov/circulars/33798
1.003 d, 0.998 d Zwicky Transient Facility No detection r , 21.02 mag; g , 20.83 mag no sources were found up in the candidate optical counterpart reported by Kitab https://gcn.nasa.gov/circulars/33799
0.537 d, 1.543 d, 1.563 d Nanshan/NEXT No detection r , 20.7 mag; r , 21.8 mag; z, 20.0 mag No optical source is detected in our stacked images at the XRT source 5 position, it doesn't reveal the Kitab candidate although it is deeper. https://gcn.nasa.gov/circulars/33800

In the end no counterpart was detected. No counterpart was in the improved IPN triangulation (https://gcn.nasa.gov/circulars/33808)

LST Observations[edit]

  • * Dates of data-taking: 2023-05-12
    • 2023-05-12 (4.1 h)
      • Zenith range (deg): 62 - 15
      • Transmission9km: n/a
      • Observation condition: dark, moonlight, high level of dust, moderate cloudiness
      • Observation mode: std wobbles
      • Runs: 12962 - 12973
      • Joint observations with MAGIC? : Yes
      • ELOG link: [1]
      • Important comments: '

Analysis by Arnau Aguasca-Cabot (UB - arnau.aguasca@fqa.ub.edu)[edit]

Data-taking information[edit]

  • Overall selected observation time: ~ 4 h
  • Selected runs: 12962 - 12973
  • Position analyzed: 295.4, 38.4

I divided the analysis between the dark analysis (12962 - 12968) and moon analysis (12969-12973) because the number of surviving pedestal for latter runs was higher than the threshold (4%) for the standard analysis. The moon raised more or less during run 12967. However, the standard cleaning seems OK until 12968.

DL1 data[edit]

Used DL1ab files produced by LSTOSA 

/fefs/aswg/data/real/DL1/20230512/v0.9/tailcut84/

For the moon analysis, I applied tighter cuts (tail cut 11, 5). Path to DL1b files for moon analysis: 

/fefs/aswg/workspace/arnau.aguasca/Analysis/results/real/DL2/20230512/srcind/v0.9.13/tailcut115_dynclg/AllSky_20230127_v0.9.12_base_prod_az_tel_dec_3476/

The config file is here: 

/fefs/aswg/workspace/arnau.aguasca/scripts/_configs/GRB230512A/real_config_lstchain_belong_v0.9.13_tailcut115.json

DL2 data[edit]

  • Random forest:
/fefs/aswg/data/models/AllSky/20230127_v0.9.12_base_prod_az_tel/dec_3476/
  • lstchain config file
/fefs/aswg/data/models/AllSky/20230127_v0.9.12_base_prod_az_tel/dec_3476/lstchain_config.json


Theta2 plot from DL2[edit]

Dark analysis

  • Cuts and parameters used:
    • intensity > 50
    • gammaness > 0.7
    • Theta2_global_cut=0.09 (the uncertainty error of the Fermi-LAT position)
    • leakage < 0.2

Moon analysis

  • Cuts and parameters used:
    • intensity > 150
    • gammaness > 0.7
    • Theta2_global_cut=0.09 (the uncertainty error of the Fermi-LAT position)
    • leakage < 0.2

The intensity cut value is chosen close to the peak of the intensity distribution for all run in moon conditions.


Theta2 plot for all runs:

Theta2 plot for GRB130512A. 3 OFF regions are used for the theta2 OFF distribution.
Theta2 plot for GRB230512A.

Appling BKG normalisation between

    • norm_range_theta2_min=0.3
    • norm_range_theta2_max=0.5

The significance is 0.23 sigma.

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