Fast Offline Analysis grb alert 740166710 June 2024 P065

Fast offline analysis grb_alert_740166710 June 2024 P065

General information

• Name of the source: grb_alert_740166710
• Brief description of the source:
  • Object type : GRB
  • Redshift (z) :
  • Other relevant information
  • RA: 22 21 33.60 (hh mm ss), Dec: +42 33 00.0 (dd mm ss)
  • RA, Dec in deg (ICRS): 335.39 , 42.55
  • Updated localization of the source: (GUANO) https://gcn.nasa.gov/circulars/36672. RA, Dec = 326.1413, +38.5948 deg

• Analysis by:
  • Juan Bernete (CIEMAT - juan.bernete@ciemat.es)

Data-taking information

• Dates of data-taking:
  • Date: 2024-06-15 (0.68 h)
    • ZD range (deg): 40 - 55
    • Observations:

2024-06-15: [17815, 17816, 17817]

• Data quality selection: no runs survive the data quality selection. Strong moon. They are still analised anyway.
• Joint observations with MAGIC?: Yes
• Information on data-taking (observations summaries):

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/YYYYMMDD/v0.10/tailcut84/dl1_LST-1.Run?????.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_4822

Random forest

Path to the models used:

/fefs/aswg/data/models/AllSky/20240131_allsky_v0.10.5_all_dec_base/dec_4822

DL2 data

Config file:

Files in:

/fefs/aswg/workspace/juan.bernete/fastanalysis/grb_alert_740166710/DL2

DL3 data & IRF

/fefs/aswg/workspace/juan.bernete/fastanalysis/grb_alert_740166710/DL3

 "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": 0.95,
   "min_theta_cut": 0.0,
   "max_theta_cut": 0.2,
   "fill_theta_cut": 0.2,
   "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

• 2024-06-15: No detection

Significance and Excess sky maps

335.39, 24.55 deg were the initial coordinates to which LST observations were performed.

Later, the location was updated: RA, Dec = 326.1413, +38.5948 deg (https://gcn.nasa.gov/circulars/36672)