GRB230723B

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Alert Information

• Name/type of the alert: SWIFT_BAT_GRB_POSITION
• GCN notice: [1]
• Triggered by: Swift BAT
• Alert coordinates:
  • RA: 16 41 30.912 (hh mm ss), Dec: -5 19 37.920 (dd mm ss)
  • RA, Dec in deg (ICRS): 250.379 deg, -5.32720 deg
• Alert arrival time: 2023-07-23T11:42:46UTC
• Other relevant information:
  • Redshift (z):

LST Observations

• Dates of data-taking: 2023-07-23
  • 2023-07-23
    • Zenith range (deg): 34 --> 57
    • Transmission9km: N.A. (MAGIC lidar not working)
    • Observation condition: moderate moon
    • Observation mode: std wobbles
    • Runs: 13767-->13777
    • Joint observations with MAGIC? : yes
    • ELOG link:[2]
    • Important comments:

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

Data-taking information

• Overall selected observation time: 189.9 min
• Selected runs: 13767-->13777
• Position analyzed: RA 250.38deg, Dec -5.33deg

DL1 data

Used DL1b files produced by LSTOSA

/fefs/aswg/data/real/DL1/20230723/v0.10/tailcut84/

DL2 data

• Random forest (custom - NSB tuned from AllSky/dec_min_413):

/fefs/aswg/workspace/irene.burelli/analysis/models/20230723/Run{runid}

• lstchain v0.9.13 with config file (cleaning tuned to NSB)

/fefs/aswg/workspace/irene.burelli/analysis/_configs/Av_NSB_params/final_NSBparams_day20230723_{runid}.json

Theta2 plot from DL2

• Cuts and parameters used:
  • intensity > 50
  • gammaness > 0.8
  • Theta2_global_cut=0.04
  • leakage < 0.2
  • norm_range_theta2_min=0.3
  • norm_range_theta2_max=0.5

Theta2 plot for GRB230723B.

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