GRB231215A

Alert Information

• Name/type of the alert:
• GCN notice: [1]
• Triggered by: SWIFT BAT
• Alert coordinates:
  • RA: 0 39 0.000 (hh mm ss), Dec: +57 38 31.920(dd mm ss)
  • RA, Dec in deg (ICRS): 9.75000 deg, 57.64220deg
• Alert arrival time: 2023-12-15T09:47:55UTC
• Other relevant information:
  • Redshift (z): 2.305

LST Observations

• Dates of data-taking: 2023-12-15
  • 2023-12-15
    • Zenith range (deg): 29.3 --> 51.2
    • Transmission9km: 0.76 --> 0.82
    • Observation condition: moon and dark
    • Observation mode: std wobbles
    • Runs: 16122,16124,16126 - 16137
    • Joint observations with MAGIC? : yes
    • ELOG link:[ http://www.lst1.iac.es/elog/LST+commissioning/3153]
    • Important comments:

Analysis by Irene Burelli (University of Udine - irene.burelli@gmail.com)

Data-taking information

• Overall selected observation time: 251.4 min
• Selected runs: 16122,16124,16126 --> 1637
• Position analyzed: RA 350.65deg, Dec -4.26deg

DL1 data

Used DL1b files produced by LSTOSA

/fefs/aswg/data/real/DL1/20231215/v0.10/tailcut84/

DL2 data

• Random forests for the runs in MOON (16122, 16124, 16126, NSB tuned from AllSky/dec_6676):

 /fefs/aswg/workspace/irene.burelli/analysis/models/20231215/v0.10.4/Run{runid}

• lstchain v0.10.4 with config file for the runs in MOON (16122, 16124, 16126)

 /fefs/aswg/workspace/irene.burelli/analysis/_configs/Av_NSB_params/final_NSBparams_day20231215_runs{run_num}.json

• Random forests for the runs in DARK (16127--> 16137)

  /fefs/aswg/data/models/AllSky/20230901_v0.10.4_allsky_base_prod/dec_6676/

• lstchain v0.10.4 with config file for the runs in DARK (16127--> 16137)

 /fefs/aswg/data/models/AllSky/20230901_v0.10.4_allsky_base_prod/dec_6676/lstchain_config_2023-09-01.json

Theta2 plot from DL2

• Cuts and parameters used:
  • intensity > 50
  • gammaness > 0.7
  • Theta2_global_cut=0.04
  • leakage < 0.2
  • norm_range_theta2_min=0.3
  • norm_range_theta2_max=0.5

Theta2 plot for GRB231215A.