GRB220527A

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Alert Information

• Name/type of the alert:
• GCN notice: [1]
• Triggered by: Fermi LAT
• Alert coordinates:
  • RA: 21 h 34 m 16.776 s, Dec: -14 deg 54 m 0.000 s
  • RA, Dec in deg (ICRS): 323.56990 deg, -14.90000 deg
• Alert arrival time: 14:49:16 UTC
• Other relevant information:
  • Redshift (z):

LST Observations

• Dates of data-taking: 2022-05-27
  • 2022-05-27
    • Zenith range (deg): 52
    • Transmission9km: 0.82
    • Observation condition: dark
    • Observation mode: std wobble
    • Runs: 8501
    • Joint observations with MAGIC? : No
    • ELOG link: [2]
    • Important comments: only one run taken due to issue in starting data taking

Analysis by Alice (INAF)

Data info

• Overall selected observation time: 18.91 min
• Selected runs: 8501
• Position analyzed: RA 323.56990 deg, Dec -14.90000 deg

DL1 data

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

/fefs/aswg/data/real/DL1/20220527/v0.9/tailcut84/dl1_LST-1.Run08501.h5

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 > 0.7
  • leakage < 0.2

Theta2 plot for GRB220527A.

Excess plot for GRB220527A.