GRB221009A

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Alert Information

• Name/type of the alert:
• GCN notice: []
• Triggered by: Fermi GBM/Swift BAT
• Alert coordinates:
  • RA: h m s, Dec: deg m s
  • RA, Dec in deg (ICRS): 288.26452 deg, +19.77350 deg
• Alert arrival time:
• Other relevant information:
  • Redshift (z): 0.151

LST Observations

• Dates of data-taking: 2022-10-10,12,15,16,17,18,21,23
  • 2022-10-10
    • Zenith range (deg): ->
    • Transmission9km:
    • Observation condition: moon
    • Observation mode: std wobble, reduced HV
    • Runs: 9604 - 9607
    • Joint observations with MAGIC? : No
    • ELOG link: [1]
    • Important comments: Data were affected by timestamp issue. (Reprocessing is already done and results below are from reprocessed data)

Analysis by Kenta (Kyoto)

• Email address of analyser: terauchi.kenta.74s@st.kyoto-u.ac.jp

Data info

• Overall selected observation time: min ( h)
• Selected runs: 9604 - 9607
• Position analyzed: RA 288.26452 deg, Dec +19.77350 deg

DL1 data

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

/fefs/aswg/data/real/DL1/20221010/v0.9/tailcut84/

DL2 data

• Random forest:

/fefs/aswg/data/models/AllSky/20220511_allsky_std/dec_2276

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

/fefs/aswg/data/models/AllSky/20220511_allsky_std/dec_2276/lstchain_84.json

Theta2 plot from DL2/DL3

• Cuts and parameters used:
  • intensity > 100
  • gammaness > 0.6, 0.3
  • leakage < 0.2
  • Eest range: 0.3 - 10 TeV

1 OFF position; gammaness > 0.6; no background normalization

1 OFF position; gammaness > 0.6; background normalization applied

1 OFF position; gammaness > 0.3; no background normalization

1 OFF position; gammaness > 0.3; background normalization applied