GRB230423A

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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: 8 10 25.176 (hh mm ss), Dec: -21 55 13.080 (dd mm ss)
  • RA, Dec in deg (ICRS): 122.60490 deg, -21.92030 deg
• Alert arrival time: 2023-04-23T19:08:56UTC
• Other relevant information:
  • Redshift (z):

LST Observations

• Dates of data-taking: 2023-04-23
  • 2023-04-23
    • Zenith range (deg): 56 --> 68
    • Transmission9km: N.A. (MAGIC lidar not working)
    • Observation condition: moderate moon (reduced dc)
    • Observation mode: std wobbles
    • Runs: 12682-->12686 , 12826-->12831
    • Joint observations with MAGIC? : no
    • ELOG link:[2]
    • Important comments:

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

Data-taking information

• Overall selected observation time: 94 min
• Selected runs: 12826-->12831
• Position analyzed: RA 122.06deg, Dec -21.92deg (Swift BAT revised position - telescope pointing)

DL1 data

Used DL1b files produced by LSTOSA

/fefs/aswg/data/real/DL1/20230423/v0.9/tailcut84/

DL2 data

• Random forest:

/fefs/aswg/data/models/AllSky/20220531_allsky_std/dec_3476

• lstchain v0.9.12 with config file

/fefs/aswg/data/models/AllSky/20220531_allsky_std/dec_3476/lstchain_config_2022-05-31.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 GRB230423A.

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