Fast Offline Analysis GRB240809A August 2024 P067

General information

• Name of the source: GRB240809A
• Brief description of the source:
  • Object type : GRB
  • Redshift (z) : ?
  • Other relevant information
  • RA, Dec in deg (ICRS): 237.5438, -2.3176

• Analysis by:
  • Irene Jiménez Martínez (MPI - irenejm@mpp.mpg.de)

Data-taking information

• Dates of data-taking:
  • Date: 2024-08-09 (2.2 h)
    • ZD range (deg): 45 - 65
    • Observations:

2024-08-05: [18530, 18531, 18532, 18533, 18534, 18535, 18536, 18537]

• Data quality selection: no run survives the data quality selection, but some runs pass all selections except the dR/dI rate selection: [18530 18531 18532 18533 18534]. FOA is performed with all runs, not only these ones.

• Joint observations with MAGIC?: yes but only between 18532 and 18535 both inclusive
• Information on data-taking (observations summaries): RTA reached more than 3 sigmas during data-taking. Camera homogeneity probably affected by MAGIC LIDAR as occurred in https://www.lst1.iac.es/wiki/index.php/Fast_Offline_Analysis_GRB240805B_August_2024_P067 . https://www.lst1.iac.es/datacheck/observation_overview/2024/08/run_summary_2024_08_09.pdf

General analysis information

• source-independent analysis
• lstchain version: v0.10.9
• DL1b standard production (v0.10/tailcut84), run-wise merged files in:

/fefs/aswg/data/real/DL1/20240809/v0.10/tailcut84/dl1_LST-1.Run18530.h5
/fefs/aswg/data/real/DL1/20240809/v0.10/tailcut84/dl1_LST-1.Run18530.h5
/fefs/aswg/data/real/DL1/20240809/v0.10/tailcut84/dl1_LST-1.Run18530.h5
/fefs/aswg/data/real/DL1/20240809/v0.10/tailcut84/dl1_LST-1.Run18530.h5
/fefs/aswg/data/real/DL1/20240809/v0.10/tailcut84/dl1_LST-1.Run18530.h5
/fefs/aswg/data/real/DL1/20240809/v0.10/tailcut84/dl1_LST-1.Run18530.h5
/fefs/aswg/data/real/DL1/20240809/v0.10/tailcut84/dl1_LST-1.Run18530.h5
/fefs/aswg/data/real/DL1/20240809/v0.10/tailcut84/dl1_LST-1.Run18537.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_min_413

Random forest

Path to the models used:

/fefs/aswg/data/models/AllSky/20240131_allsky_v0.10.5_all_dec_base/dec_min_413

DL2 data

Config file:

/fefs/aswg/data/models/AllSky/20240131_allsky_v0.10.5_all_dec_base/dec_min_413/lstchain_config_2024-01-31.json

Files in:

/fefs/aswg/workspace/irene.jimenez/FOA/GRB240809A_20240809/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

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

• 2024-08-09:

Significance and Excess sky maps

Camera homogeneity probably affected by MAGIC LIDAR as occurred in https://www.lst1.iac.es/wiki/index.php/Fast_Offline_Analysis_GRB240805B_August_2024_P067 .