Difference between revisions of "Fast Offline Analysis GRB240805B August 2024 P067"

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*Joint observations with MAGIC?: yes
 
*Joint observations with MAGIC?: yes
 
*Information on data-taking (observations summaries): https://www.lst1.iac.es/datacheck/observation_overview/2024/08/run_summary_2024_08_05.pdf
 
*Information on data-taking (observations summaries): https://www.lst1.iac.es/datacheck/observation_overview/2024/08/run_summary_2024_08_05.pdf
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From Seiya Nozaki (via Slack): The last part of observations was significantly affected by MAGIC LIDAR, then rate control was not properly working and the rates were very low (~1 kHz). It seems this also affected the camera homogeneity, so I think that's why the background level is different between ON/OFF.
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http://www.lst1.iac.es/elog/LST+commissioning/3512
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This seems to be causing spurious excess due to ON/OFF mismatch in one of the latest GRB data runs (18448)
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[[File:Run_summary_20240805.png | 600 px]]
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[[File:Camera_inhomogeneity_run_18447_grb.png | 400 px]]
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[[File:Camera_inhomogeneity_run_18448_grb.png | 400 px]]
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Those last runs of GRB observations present a much higher camera average rate.
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[[File:Camera_avg_rate_20240805_grb_observations.png | 900 px]]
  
 
==General analysis information==
 
==General analysis information==
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=== Light curve ===
 
=== Light curve ===
  
Note: Run 18448 has excess of events in theta2 plot, likely because camera homogeneity was affected by MAGIC LiDAR and ON/OFF counts were different. See explanation here: https://www.lst1.iac.es/elog/LST+commissioning/3512 .
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Note: Run 18448 has an excess of events in theta2 plot, likely because camera homogeneity was affected by MAGIC LiDAR and ON/OFF counts were different. See explanation here: https://www.lst1.iac.es/elog/LST+commissioning/3512.
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[[ File:Lc_grb240805b_ryuji_FOA.png | 500 px]]

Latest revision as of 17:20, 7 August 2024

General information[edit]

  • Name of the source: GRB240805B
  • Brief description of the source:
    • Object type : GRB
    • Redshift (z) : ?
    • Other relevant information
    • RA, Dec in deg (ICRS): 254.2391, 18.3233
  • Analysis by:
    • Irene Jiménez Martínez (MPI - irenejm@mpp.mpg.de)

Data-taking information[edit]

  • Dates of data-taking:
    • Date: 2024-08-05 (3.8 h)
      • ZD range (deg): 10 - 60
      • Observations:
2024-08-05: [18438, 18439, 18440, 18441, 18442, 18443, 18444, 18445, 18446, 18447, 18448, 18449]

Diagnostic GRB240805B 20240805 irenejm.png

From Seiya Nozaki (via Slack): The last part of observations was significantly affected by MAGIC LIDAR, then rate control was not properly working and the rates were very low (~1 kHz). It seems this also affected the camera homogeneity, so I think that's why the background level is different between ON/OFF. http://www.lst1.iac.es/elog/LST+commissioning/3512

This seems to be causing spurious excess due to ON/OFF mismatch in one of the latest GRB data runs (18448)

Run summary 20240805.png


Camera inhomogeneity run 18447 grb.png Camera inhomogeneity run 18448 grb.png

Those last runs of GRB observations present a much higher camera average rate.

Camera avg rate 20240805 grb observations.png

General analysis information[edit]

  • source-independent analysis
  • lstchain version: v0.10.9
  • DL1b standard production (v0.10/tailcut84), run-wise merged files in:
/fefs/aswg/data/real/DL1/20240805/v0.10/tailcut84/dl1_LST-1.Run18438.h5
/fefs/aswg/data/real/DL1/20240805/v0.10/tailcut84/dl1_LST-1.Run18439.h5
/fefs/aswg/data/real/DL1/20240805/v0.10/tailcut84/dl1_LST-1.Run18440.h5
/fefs/aswg/data/real/DL1/20240805/v0.10/tailcut84/dl1_LST-1.Run18441.h5
/fefs/aswg/data/real/DL1/20240805/v0.10/tailcut84/dl1_LST-1.Run18442.h5
/fefs/aswg/data/real/DL1/20240805/v0.10/tailcut84/dl1_LST-1.Run18443.h5
/fefs/aswg/data/real/DL1/20240805/v0.10/tailcut84/dl1_LST-1.Run18444.h5
/fefs/aswg/data/real/DL1/20240805/v0.10/tailcut84/dl1_LST-1.Run18445.h5
/fefs/aswg/data/real/DL1/20240805/v0.10/tailcut84/dl1_LST-1.Run18446.h5
/fefs/aswg/data/real/DL1/20240805/v0.10/tailcut84/dl1_LST-1.Run18447.h5
/fefs/aswg/data/real/DL1/20240805/v0.10/tailcut84/dl1_LST-1.Run18448.h5
/fefs/aswg/data/real/DL1/20240805/v0.10/tailcut84/dl1_LST-1.Run18449.h5

Monte Carlo information[edit]

Write below the MC production ID among the existing MC

  • All-sky MC production used: 20240131_allsky_v0.10.5_all_dec_base
  • Declination line (training): dec_2276


Random forest[edit]

Path to the models used:

/fefs/aswg/data/models/AllSky/20240131_allsky_v0.10.5_all_dec_base/dec_2276


DL2 data[edit]

Config file:

/fefs/aswg/data/models/AllSky/20240131_allsky_v0.10.5_all_dec_base/dec_2276/lstchain_config_2024-01-31.json

Files in:

/fefs/aswg/workspace/irene.jimenez/FOA/GRB240805B_20240805/DL2


DL3 data & IRF[edit]

"EventSelector": {
   "filters": {
     "intensity": [50, Infinity],
     "width": [0, Infinity],
     "length": [0, Infinity],
     "r": [0, 1],
     "wl": [0.01, 1],
     "leakage_intensity_width_2": [0, 1],
     "event_type": [32, 32]
   }
 },
 "DL3Cuts": {
   "min_event_p_en_bin": 100,
   "min_gh_cut": 0.1,
   "max_gh_cut": 0.98,
   "min_theta_cut": 0.1,
   "max_theta_cut": 0.32,
   "fill_theta_cut": 0.32,
   "allowed_tels": [1]
 }


  • 70 % efficiency for both gammaness and theta gamma-ray selection cuts
  • Point-like IRF

High-level analysis and results[edit]

Analysis settings[edit]

  • Gammapy version: 1.1
  • 1D analysis (point-like IRF)

Theta2 plot[edit]

Settings:

  • Theta2 cut for signal extraction: 0.04 deg2
  • Normalization range: 0.1 - 0.4 deg2
  • Number of off positions: 3
  • Energy range: 0.01 - 10 TeV

Daily results[edit]

  • 2024-08-05: No detection

Theta2 GRB240805B 20240805 irenejm.png


Stacked observations[edit]

Significance and Excess sky maps[edit]

Spectral results[edit]

Light curve[edit]

Note: Run 18448 has an excess of events in theta2 plot, likely because camera homogeneity was affected by MAGIC LiDAR and ON/OFF counts were different. See explanation here: https://www.lst1.iac.es/elog/LST+commissioning/3512.

Lc grb240805b ryuji FOA.png