Fast offline analysis GRB240811A August 2024 P067

General information

• Name of the source: GRB240811A
• Brief description of the source:
  • Object type : GRB
  • Redshift (z) : ?
  • Other relevant information
  • RA, Dec in deg (ICRS): 226.3622, 28.8957
• Analysis by:
  • Ryuji Takeishi (ICRR - take@icrr.u-tokyo.ac.jp)

Data-taking information

• Dates of data-taking: 2024-08-11
  • • ZD range (deg): --> 30-50 deg
    • AZ range (deg): -->
    • Transmission9km:
    • Observation condition: moon
    • Observation mode: std wobbles
    • Observations:

'2024-08-11': [18574, 18575, 18576, 18577, 18578] 1.84 h

• Data quality selection: Almost runs did not survive the default dR/dI@442pe limit of 1.5. Likely due to high dust concentration
• Joint observations with MAGIC? : yes
• Information on data-taking (observations summaries): https://www.lst1.iac.es/datacheck/observation_overview/2024/08/run_summary_2024_08_11.pdf

General analysis information

• source-independent analysis
• lstchain version: v0.10.11
• DL1b standard production (v0.10/tailcut84), run-wise merged files in:

/fefs/aswg/data/real/DL1/20240811/v0.10/tailcut84/dl1_LST-1.Run18574.h5
/fefs/aswg/data/real/DL1/20240811/v0.10/tailcut84/dl1_LST-1.Run18575.h5
/fefs/aswg/data/real/DL1/20240811/v0.10/tailcut84/dl1_LST-1.Run18576.h5
/fefs/aswg/data/real/DL1/20240811/v0.10/tailcut84/dl1_LST-1.Run18577.h5
/fefs/aswg/data/real/DL1/20240811/v0.10/tailcut84/dl1_LST-1.Run18578.h5

Monte Carlo information

Write below the MC production id among the existing MC

• All-sky MC production used: 20240131_allsky_v0.10.5_all_dec_base
  • Declination line (training): dec_3476

High-NSB analysis:

• All-sky MC production used: 20240229_dec34_nsb14
  • Declination line (training): dec_3476

Random forest

Path to the models used:

/fefs/aswg/data/models/AllSky/20240131_allsky_v0.10.5_all_dec_base/dec_3476

High-NSB analysis:

/fefs/aswg/data/models/AllSky/20240229_dec34_nsb14/dec_3476

DL2 data

Config file (standard):

/fefs/aswg/data/models/AllSky/20240131_allsky_v0.10.5_all_dec_base/dec_3476/lstchain_config_2024-01-31.json

Config file (high-nsb):

/fefs/aswg/data/models/AllSky/20240229_dec34_nsb14/dec_3476/llstchain_config_2024-02-29.json

Files in:

/fefs/aswg/workspace/ryuji.takeishi/FOA/GRB240811A/DL2
/fefs/aswg/workspace/ryuji.takeishi/FOA/GRB240811A/NSB14/DL2

DL3 data & IRF

 "EventSelector": {
   "filters": {
     "intensity": [50, Infinity],
     "width": [0, Infinity],
     "length": [0, Infinity],
     "r": [0, 1],
     "wl": [0.01, 1],
     "leakage_intensity_width_2": [0, 1],
     "event_type": [32, 32]
   }
 },
 "DL3Cuts": {
   "min_event_p_en_bin": 100,
   "min_gh_cut": 0.1,
   "max_gh_cut": 0.98,
   "min_theta_cut": 0.1,
   "max_theta_cut": 0.32,
   "fill_theta_cut": 0.32,
   "allowed_tels": [1]
 },

• 70 % efficiency for both gammaness and theta gamma-ray selection cuts
• Point-like IRF

Files in:

/fefs/aswg/workspace/ryuji.takeishi/FOA/GRB240811A/DL3
/fefs/aswg/workspace/ryuji.takeishi/FOA/GRB240811A/NSB14/DL3

High-level analysis

• Gammapy 1.1
• 1D analysis (point-like IRF)

Analysis Results

Theta2 plot

Settings:

• Theta2 cut for signal extraction: 0.04 deg2
• Normalization range: 0.1 - 0.4 deg2
• Number of off positions: 3
• Energy range: 100 GeV - 10 TeV

Daily results

2024-08-03: No detection

2024-08-08: No detection