GRB221025A

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Alert Information

• GCN notice: [1]
• Triggered by: Fermi LAT
• Alert coordinates:
  • RA: 8 h 53 m 31.176 s, Dec: +10 deg 59 m 24 s
  • RA, Dec in deg (ICRS): 133.37990 deg, 10.99 deg
• Alert arrival time: 08:36:09 UTC
• Other relevant information:
  • Redshift (z):

LST Observations

• Dates of data-taking: 2022-10-25
  • 2022-10-25
    • Zenith range (deg): 61.25 --> 34.7
    • Transmission9km: n/a
    • Observation condition: dark
    • Observation mode: std wobble
    • Runs: 9908 - 9914
    • Joint observations with MAGIC? : No
    • ELOG link: [2]
    • Important comments: car flashes in the last run

Analysis by Alice

Data info

• Overall selected observation time: 2.19h
• Selected runs: 9910, 9912, 9913, 9914
• Position analyzed: Ra 133.37990 deg, Dec 10.99 deg

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_931

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

/fefs/aswg/data/models/AllSky/20220511_allsky_std/dec_931/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 GRB221025A.