Fast Offline Analysis GRB240809A August 2024 P067

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General information

  • Name of the source: GRB240809A
  • Brief description of the source:
    • Object type : GRB
    • Redshift (z) : ?
    • Other relevant information
    • RA, Dec in deg (ICRS): 237.5438, -2.3176
  • Analysis by:
    • Irene Jiménez Martínez (MPI - irenejm@mpp.mpg.de)

Data-taking information

  • Dates of data-taking:
    • Date: 2024-08-09 (2.2 h)
      • ZD range (deg): 45 - 65
      • Observations:
2024-08-05: [18530, 18531, 18532, 18533, 18534, 18535, 18536, 18537]

Diagnostic GRB240809A 20240809 irenejm.png

  • Data quality selection: no run survives the data quality selection, but some runs pass all selections except the dR/dI rate selection: [18530 18531 18532 18533 18534]. FOA is performed with all runs, not only these ones.

General analysis information

  • source-independent analysis
  • lstchain version: v0.10.9
  • DL1b standard production (v0.10/tailcut84), run-wise merged files in:
/fefs/aswg/data/real/DL1/20240809/v0.10/tailcut84/dl1_LST-1.Run18530.h5
/fefs/aswg/data/real/DL1/20240809/v0.10/tailcut84/dl1_LST-1.Run18531.h5
/fefs/aswg/data/real/DL1/20240809/v0.10/tailcut84/dl1_LST-1.Run18532.h5
/fefs/aswg/data/real/DL1/20240809/v0.10/tailcut84/dl1_LST-1.Run18533.h5
/fefs/aswg/data/real/DL1/20240809/v0.10/tailcut84/dl1_LST-1.Run18534.h5
/fefs/aswg/data/real/DL1/20240809/v0.10/tailcut84/dl1_LST-1.Run18535.h5
/fefs/aswg/data/real/DL1/20240809/v0.10/tailcut84/dl1_LST-1.Run18536.h5
/fefs/aswg/data/real/DL1/20240809/v0.10/tailcut84/dl1_LST-1.Run18537.h5

Monte Carlo information

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_min_413


Random forest

Path to the models used:

/fefs/aswg/data/models/AllSky/20240131_allsky_v0.10.5_all_dec_base/dec_min_413


DL2 data

Config file:

/fefs/aswg/data/models/AllSky/20240131_allsky_v0.10.5_all_dec_base/dec_min_413/lstchain_config_2024-01-31.json

Files in:

/fefs/aswg/workspace/irene.jimenez/FOA/GRB240809A_20240809/DL2


DL3 data & IRF

"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

Analysis settings

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

Theta2 plot

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

  • 2024-08-09:

Theta2 GRB240809A 20240809 irenejm.png


Stacked observations

Significance and Excess sky maps

Camera homogeneity probably affected by MAGIC LIDAR as occurred in https://www.lst1.iac.es/wiki/index.php/Fast_Offline_Analysis_GRB240805B_August_2024_P067 .

Skymap200GeV GRB240809A 20240809 irenejm.png

Skymap200GeVbgkres GRB240809A 20240809 irenejm.png

Spectral results

Light curve