GRB221009A

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Go back to Transient Working Group.

Go Back to Gamma-Ray Bursts (GRBs).


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

Multi-wavelength Observations

Some references useful to understand the multi-wavelength context:

  • Discussion on modelling/jet structure:


Publication status

Targeted journal:

Section Preliminary deadline Status Responsible (and main responsible)
Introduction Ongoing All (Monica)
Observations Ongoing All (Alice?)
Data Analysis (Moon) Ongoing Arnau, Kenta
Data Analysis (Dark) Ongoing Arnau, Kenta
Results Ongoing Arnau, Kenta
Modelling Not started Susumu
Discussion Not started All (Alessandro)
Conclusion Not started All

LST Observations

  • Observation conditions
    • camera summary plot [1]
    • first night (Oct 10) of the GRB observation and moon Crab observation (Nov 3-5) superplots
  • Dates of data-taking: 2022-10-10,12,15-18,21,23-26,28,31. 2022-11-13,16,17,20
    • 2022-10-10
      • Zenith range (deg): 38.8 -> 57.9
      • Transmission9km: n/a
      • Observation condition: moon
      • Observation mode: std wobble, reduced HV
      • Runs: 9604 - 9607
      • Joint observations with MAGIC? : No
      • ELOG link: [2]
      • Important comments: Data were affected by timestamp issue. (Reprocessing is already done and results below are from reprocessed data)
    • 2022-10-12
      • Zenith range (deg): 34.6 -> 50.5
      • Transmission9km: n/a
      • Observation condition: moon
      • Observation mode: std wobble, reduced HV
      • Runs: 9613 - 9617
      • Joint observations with MAGIC? : Yes
      • ELOG link: [3]
      • Important comments: Data were affected by timestamp issue. (Reprocessing is already done and results below are from reprocessed data). Run 9613 taken with HV setting "set_hv_reduced_0.5", the others with "set_hv_reduced_0.3"
    • 2022-10-15
      • Zenith range (deg): 23.8 -> 57.9
      • Transmission9km: n/a
      • Observation condition: dark and moon (9629,9630)
      • Observation mode: std wobble
      • Runs: 9625 - 9630
      • Joint observations with MAGIC? : Yes, except the first 2 runs
      • ELOG link: [4]
      • Important comments: Data were affected by timestamp issue. (Reprocessing is already done and results below are from reprocessed data)
    • 2022-10-16
      • Zenith range (deg): 32.1 -> 64.1
      • Transmission9km: n/a
      • Observation condition: dark
      • Observation mode: std wobble
      • Runs: 9640 - 9647
      • Joint observations with MAGIC? : No
      • ELOG link: [5]
      • Important comments: Data were affected by timestamp issue. (Reprocessing is already done and results below are from reprocessed data)
    • 2022-10-17
      • Zenith range (deg): 25.9 -> 58.6
      • Transmission9km: n/a
      • Observation condition: dark
      • Observation mode: std wobble
      • Runs: 9670 - 9677
      • Joint observations with MAGIC? : Yes
      • ELOG link: [6]
      • Important comments: Data were affected by timestamp issue. (Reprocessing is already done and results below are from reprocessed data)
    • 2022-10-18
      • Zenith range (deg): 23.1 -> 43.5
      • Transmission9km: n/a
      • Observation condition: dark
      • Observation mode: std wobble
      • Runs: 9691 - 9696
      • Joint observations with MAGIC? : No
      • ELOG link: [7]
      • Important comments: unstable rate in run 9691
    • 2022-10-21
      • Zenith range (deg): 34.6 -> 55.6
      • Observation condition: dark
      • Observation mode: std wobble
      • Runs: 9802 - 9807
      • Joint observations with MAGIC? : Yes
      • ELOG link: [8]
      • Important comments:
    • 2022-10-23
      • Zenith range (deg): 32.07 -> 59.21
      • Observation condition: dark
      • Observation mode: std wobble
      • Runs: 9829 - 9835
      • Joint observations with MAGIC? : Yes
      • ELOG link: [9]
      • Important comments:
    • 2022-10-24
      • Zenith range (deg): 49.6 -> 58.8
      • Observation condition: dark
      • Observation mode: std wobble
      • Runs: 9861 - 9863
      • Joint observations with MAGIC? : No
      • ELOG link: [10]
      • Important comments: some clouds
    • 2022-10-25
      • Zenith range (deg): 43.6 -> 56
      • Observation condition: dark
      • Observation mode: std wobble
      • Runs: 9888 - 9891
      • Joint observations with MAGIC? : Yes
      • ELOG link: [11]
      • Important comments:
    • 2022-10-26
      • Zenith range (deg): 40 -> 56
      • Observation condition: dark
      • Observation mode: std wobble
      • Runs: 9917 - 9920
      • Joint observations with MAGIC? : Only run 9919
      • ELOG link: [12]
      • Important comments: run 9918,9919 are both in W2
    • 2022-10-28
      • Zenith range (deg): 36.04 -> 50.09
      • Observation condition: moon (first 3 runs) and dark
      • Observation mode: std wobble
      • Runs: 9956 - 9960
      • Joint observations with MAGIC? : yes
      • ELOG link: [13]
      • Important comments:
    • 2022-10-31
      • Zenith range (deg): 58
      • Observation condition: moon
      • Observation mode: std wobble
      • Runs: 10021
      • Joint observations with MAGIC? : yes
      • ELOG link: [14]
      • Important comments: calibration rate is zero, but Calibox is connected and firing
    • 2022-11-13
      • Zenith range (deg): 41->58
      • Observation condition: dark conditions
      • Observation mode: std wobble
      • Runs: 10501 - 10505
      • Joint observations with MAGIC? : no
      • ELOG link: [15]
      • Important comments: Structure in FAULT, BUSY spikes.
    • 2022-11-16
      • Zenith range (deg): 48->64
      • Observation condition: dark conditions
      • Observation mode: std wobble
      • Runs: 10611 - 10614
      • Joint observations with MAGIC? : yes
      • ELOG link: [16]
      • Important comments: Several spikes in rates. At 20:19, MAGIC stopped util 21:15.
    • 2022-11-17
      • Zenith range (deg): 43->65
      • Observation condition: dark conditions
      • Observation mode: std wobble
      • Runs: 10643 - 10650
      • Joint observations with MAGIC? : no for 10643, yes for the rest
      • ELOG link: [17]
      • Important comments: Several spikes in rates.
    • 2022-11-20
      • Zenith range (deg): 45->67
      • Observation condition: dark conditions
      • Observation mode: std wobble
      • Runs: 10892 - 10899
      • Joint observations with MAGIC? : yes
      • ELOG link: [18]
      • Important comments: Several car flashes (19:47, 19:58 and 20:58)

Fast check: Src-indep 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

  • Cuts and parameters used:
    • intensity > 100
    • gammaness > 0.6, 0.3
    • leakage < 0.2
    • Eest range: 0.3 - 10 TeV
    • th2 cut = 0.04
    • background normalization range: 0.2 < th2 < 0.4
Theta2 plot for GRB221009A.
1 OFF position; gammaness > 0.6; no background normalization
Theta2 plot for GRB221009A.
1 OFF position; gammaness > 0.6; background normalization applied
Theta2 plot for GRB221009A.
1 OFF position; gammaness > 0.3; no background normalization
Theta2 plot for GRB221009A.
1 OFF position; gammaness > 0.3; background normalization applied

Significance evolution

Significance evolution for GRB221009A.
1 OFF position; gammaness > 0.6; with background normalization
Significance evolution for GRB221009A.
1 OFF position; gammaness > 0.3; with background normalization


Detailed analysis

Related analysis pages

Source-dependent analysis

Source-independent analysis


Conferences