Fast Offline Analysis GRB240929A October 2024 P069

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Fast offline analysis GRB240929A October 2024 P069

General information

• Name of the source: GRB240929A
• Brief description of the source:
  • Object type : GRB (https://gcn.nasa.gov/circulars/37630)
  • Redshift (z) :
  • Other relevant information
  • RA, Dec in deg (ICRS): 2.4233, 74.8275

• Analysis by:
  • Yusuke Suda (Hiroshima University - ysuda@hiroshima-u.ac.jp)

Data-taking information

• Dates of data-taking:
  • Date: 2024-09-29 (1.86 h)
    • ZD range (deg): ~58 - ~50 deg
    • Observations:

2024-09-26: [19233, 19234, 19235, 19236, 19237, 19238]

• Data quality selection:
  • Number of selected runs: 6
  • Data quality. All data passed the criteria.

• Joint observations with MAGIC?:
• Information on data-taking (observations summaries):

https://www.lst1.iac.es/datacheck/observation_overview/2024/09/run_summary_2024_09_29.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/DL1/20240929/v0.10/tailcut84/dl1_LST-1.Run19???.h5

Monte Carlo information

• All-sky MC production used: 20240131_allsky_v0.10.5_all_dec_base
• Declination line (training): dec_6676

Random forest

Path to the models used:

/fefs/aswg/data/models/AllSky/20240131_allsky_v0.10.5_all_dec_base/dec_6676

DL2 data

Config file:

/fefs/aswg/data/models/AllSky/20240131_allsky_v0.10.5_all_dec_base/dec_6676/lstchain_config_2024-01-31.json 

Files in:

/fefs/aswg/workspace/yusuke.suda/analysis/GRB240929A/DL2

DL3 data & IRF

Files in:

/fefs/aswg/workspace/yusuke.suda/analysis/GRB240929A/DL3

Configuration used for producing IRF/DL3 files:

 "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]
 },

• Standard cuts: Intensity > 50 p.e., 70 % efficiency for both gammaness and theta gamma-ray selection energy-dependent cuts
• Point-like IRF

High-level analysis and results

Analysis settings

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

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: 0.01 - 10 TeV

Daily results

• 2024-09-29: No detection

Significance and Excess sky maps

Energy > 500 GeV