GRB241029A

Alert Information

• Name/type of the alert: GRB 241029A
• GCN circular: [1]
• Astro-COLIBRI: [2]
• Triggered by: SVOM/ECLAIRs
• Alert coordinates:
  • RA: 21 41 18.48 (hh mm ss), Dec: 5 5 9.6 (dd mm ss)
  • RA, Dec in deg (ICRS): 325.327deg, 5.086deg
• Alert arrival time: 2024-10-29 02:19:53UTC
• Other relevant information:
  • GCN notices + circulars: [3]
  • Redshift (z): z = 1.072 (OSIRIS@GTC, GCN #37950 [4])

LST Observations

• Dates of data-taking: 2024-10-29
  • 2024-10-29
    • Zenith range (deg): 26 --> 40
    • Transmission9km: tbd
    • Observation condition: dark
    • Observation mode: std wobbles
    • Runs: 19377 - 19382
    • Joint observations with MAGIC? : yes (19377 - 19382)
    • ELOG link:[ https://www.lst1.iac.es/elog/LST+commissioning/3632]
    • Important comments:

Fast analysis

• Analysis by:
  • Analyzer 1 name (Roger Grau - rgrau@ifae.es)
  • Analyzer 2 Tora T. H. Arnesen (IAC - tora.arnesen@iac.es)

Data-taking information

• Dates of data-taking: 2024-10-29
  • Date (time of observation h) 2024-10-29: 1.488 h
    • ZD range (deg): 22-42
    • Observations: (see example below)

2024-10-29: [19377 19378 19379 19381 19382]

• Data quality selection: 19376, 19380 runs did not survive the data quality selection (max NSB std: 2.3)

Cross-check

• Dates of data-taking: 2024-10-29
  • Date (time of observation h) 2024-10-29: 1.27 h
    • ZD range (deg): 24-42
    • Observations: (see example below)

2024-10-29: [19378 19379 19380 19381 19382]

• Data quality selection: runs 19376 and 19377 failed default dR/dI rate and were not included

Note: run 19380 was cut from high-level analysis as elapsed_time < 300s

General analysis information

• source-independent analysis
• lstchain version: v0.10.12
• 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

• All-sky MC production used: 20240131_allsky_v0.10.5_all_dec_base
• Declination line (training): dec_931

Random forest

Path to the models used:

/fefs/aswg/data/models/AllSky/20240131_allsky_v0.10.5_all_dec_base/dec_931

DL2 data

The config file to produce the DL2 files must be the one used to produce the RF models. Should be located together with model's files.

Files in:

/fefs/aswg/workspace/roger.grau/fast_oa_Oct_2024/GRB241029A/DL2

DL3 data & IRF

Files in:

/fefs/aswg/workspace/roger.grau/fast_oa_Oct_2024/GRB241029A/DL3

Configuration used for producing IRF/DL3 files (you can leave standard settings):

 "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 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

• 2024-10-29: No detection

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