GRB221009A

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Go back to Transient Working Group.

Go Back to Gamma-Ray Bursts (GRBs).

Contents

1 Alert Information
2 Multi-wavelength Observations
3 LST Observations
4 Fast check: Src-indep analysis by Kenta (Kyoto)
5 Detailed analysis
- 5.1 Related analysis pages
  - 5.1.1 Source-dependent analysis
  - 5.1.2 Source-independent analysis
6 Conferences

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:

Swift: https://www.swift.ac.uk/burst_analyser/01126853/

Fermi-GBM: https://arxiv.org/pdf/2303.14172.pdf

Fermi-LAT: https://agenda.infn.it/event/33457/contributions/204976/attachments/109809/156172/BISSALDI_TeVPa_BoatGRB_230913.pdf

H.E.S.S. paper. (53 hours after) : https://arxiv.org/pdf/2303.10558.pdf

LHAASO paper (last stage at 10^3s): https://arxiv.org/pdf/2306.06372.pdf

Discussion on the jet structure:

- Clearest evidence of structure of a jet so far.Indirect evidence for structured jets in long GRBs has been around for a while: https://arxiv.org/abs/2206.11088
- HESS upper limits combined with radio measurements indeed already constrain parameters such as the circumburst density for the outer jet. https://arxiv.org/abs/2310.12856
- numerical simulations to study the structured jets e.g. Gottlieb et al. https://ui.adsabs.harvard.edu/abs/2022MNRAS.510.4962G/abstract
- structure evolution of the afterglow using VLBI observations. Giarratana, Salafia, Ghirlanda et al. https://arxiv.org/pdf/2311.05527.pdf

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

Low-level reprocessing: strong moon condition

Source-dependent analysis

Source-dependent analysis in strong moon condition

Source-independent analysis

Conferences

HEPRO VIII GRB221009A analysis

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