GRB221028A

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Alert Information

• GCN notice: [1]
• Triggered by: Swift BAT
• Alert coordinates:
  • RA: 20 h 56 m 49.392 s, Dec: +41 deg 3 m 56.160 s
  • RA, Dec in deg (ICRS): 314.20580 deg, 41.06560 deg
• Alert arrival time: 13:16:47 UTC
• Other relevant information:
  • Redshift (z):

LST Observations

• Dates of data-taking: 2022-10-28
  • 2022-10-28
    • Zenith range (deg): 31 --> 50.72
    • Transmission9km: n/a
    • Observation condition: dark
    • Observation mode: std wobble
    • Runs: 9961 - 9968
    • Joint observations with MAGIC? : Yes
    • ELOG link: [2]
    • Important comments: runs 9961-9962-9963 calibration rate was 0 and in run 9964 telescope stop tracking and still calibration rate is 0

Analysis by Alice

Data info

• Overall selected observation time: 52.8min (0.9h)
• Selected runs: 9965, 9966, 9967, 9968
• Position analyzed: RA 314.20580 deg, Dec 41.0656 deg

DL1 data

Used DL1b files produced by LSTOSA (lstchain v0.9.6)

/fefs/aswg/data/real/DL1/20221028/v0.9/tailcut84/

DL2 data

• Random forest:

/fefs/aswg/data/models/AllSky/20220511_allsky_std/dec_min_413

• lstchain v0.9.6 with config file taken from the All Sky model

/fefs/aswg/data/models/AllSky/20220511_allsky_std/dec_min_413/lstchain_84.json

Theta2 plot from DL2

• Cuts and parameters used:
  • intensity > 50
  • gammaness > 0.6
  • leakage < 0.2
  • norm_range_theta2_min=0.2
  • norm_range_theta2_max=0.5

Theta2 plot for GRB221028A.