Fast Offline Analysis grb alert 740166710 June 2024 P065

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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

 "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

Theta2 grb alert 740166710 20240615 juanbernete.png

Stacked observations

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)

GRB240615 TS distribution.ong.png

GRB240615A skymap dmorcuende.png

Spectral results

Light curve