Fast offline analysis GRB May 2024

Alert Information

• Name/type of the alert: PKT 61 - SWIFT_BAT_GRB_POSITION
• GCN notice: [1]
• Triggered by: Swift BAT
• Alert coordinates:
  • RA: 22 21 17.160 (hh mm ss), Dec: 51 33 18.720 (dd mm ss)
  • RA, Dec in deg (ICRS): 335.32150deg, 51.55520deg
• Alert arrival time: 2024-05-29 02:58:48UTC
• Other relevant information:
  • Redshift (z): 2.695

General information

• Name of the source: GRB 240529A
• Brief description of the source:
  • Object type : GRB
  • Redshift (z) : 2.695
  • Other relevant information
  • RA: 22:21:26.04 (hh mm ss), Dec: +51:33:43.4 (dd mm ss)
  • RA, Dec in deg (ICRS): 335.35851, 51.56205
• Analysis by:
  • Lea Heckmann (MPP - heckmann@mpp.mpg.de)
  • Arnau Aguasca-Cabot (UB - arnau.aguasca@fqa.ub.edu). The analysis performed by Arnau is described here

Data-taking information

• Dates of data-taking: 2024-05-28
  • 2024-05-28 (1.6 h)
    • ZD range (deg): 46 --> 33
    • AZ range (deg): 45 --> 37.5
    • Transmission9km: 0.94
    • Observation condition: moon and dark
    • Observation mode: std wobbles
    • Runs: 17478 - 17483
    • ELOG link:[ http://www.lst1.iac.es/elog/LST+commissioning/3377]
    • Important comments: first run (17478) performed with wrong coordinates. second run (17479) was interrupted to synchronize with Magic
    • Observations:

'2024-05-28': [17479, 17480 17481 17482 17483] 1.23h

• Data quality selection applied on above data sample: All cut because of NSB, analysis stil done. Run 17479 not included in theta2 because <5 min according to script
• Joint observations with MAGIC? : No
• Information on data-taking (observations summaries): https://www.lst1.iac.es/datacheck/observation_overview/2024/05/run_summary_2024_05_28.pdf

General analysis information

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

Monte Carlo information

Write below the MC production id among the existing MC

• All-sky MC production used: 20240426_v0.10.9_src3_dec3476_4822_tunedNSB
  • Declination line (training): dec_4822

/fefs/aswg/data/real/DL1/20240528/v0.10/tailcut84/dl1_LST-1.Run17479.h5 /fefs/aswg/data/real/DL1/20240528/v0.10/tailcut84/dl1_LST-1.Run17480.h5 /fefs/aswg/data/real/DL1/20240528/v0.10/tailcut84/dl1_LST-1.Run17481.h5 /fefs/aswg/data/real/DL1/20240528/v0.10/tailcut84/dl1_LST-1.Run17482.h5 /fefs/aswg/data/real/DL1/20240528/v0.10/tailcut84/dl1_LST-1.Run17483.h5

Random forest

Path to the models used:

/fefs/aswg/data/models/AllSky/20240426_v0.10.9_src3_dec3476_4822_tunedNSB/dec_4822

DL2 data

Config file:

/fefs/aswg/data/models/AllSky/20240426_v0.10.9_src3_dec3476_4822_tunedNSB/dec_4822/lstchain_config_2024-04-26.json

Files in:

/fefs/aswg/workspace/lea.heckmann/FOA/GRB_20240528/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

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

Analysis Results

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: 100 GeV - 10 TeV

Daily results

• 2024-05-28

Spectral results

• 2024-05-28

Spectral parameters: PL

No enough signal

Light curve

• 2024-05-28

not enough signal