GRB230414B

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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: 12 4 17.112 (hh mm ss), Dec: +53 7 36.480 (dd mm ss)
  • RA, Dec in deg (ICRS): 181.07130deg, 53.12680deg
• Alert arrival time: 2023-04-14T16:15:16UTC
• Other relevant information:
  • Redshift (z): 3.568 (GTC/OSIRIS) [2]

LST Observations

• Dates of data-taking: 2023-04-14
  • 2023-04-14
    • Zenith range (deg): 31-->41
    • Transmission9km: N.A. (MAGIC lidar not working)
    • Observation condition: dark
    • Observation mode: std wobbles
    • Runs: 12682-->12686 , 12690-->12696
    • Joint observations with MAGIC? : yes
    • ELOG link:[3]
    • Important comments:

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

Data-taking information

• Overall selected observation time: 202 min
• Selected runs: 12682-->12686 , 12690-->12696
• Position analyzed: RA 181.09deg, Dec 53.15deg (Swift BAT revised position - telescope pointing)

DL1 data

Used DL1b files produced by LSTOSA

/fefs/aswg/data/real/DL1/20230414/v0.9/tailcut84/

DL2 data

• Random forest:

/fefs/aswg/data/models/AllSky/20220511_allsky_std/dec_4822

• lstchain v0.9.12 with config file

/fefs/aswg/data/models/AllSky/20220523_allsky_std/dec_min_2924/lstchain_config_2022-05-23.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 GRB230414B.

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