Fast Offline Analysis GRB240825A August 2024 P068

General information

• Name of the source:
• Brief description of the source: GRB 240825A
  • Object type : GRB
  • Redshift : z = 0.659
  • Other relevant information
  • RA, Dec in deg (ICRS): 344.56, 1.04
  • RA: 22h 58m 14.4s, Dec: 1° 02' 24"
  • Analysis by:
  • Helena Luciani (University of Trieste - helena.luciani@phd.units.it)

Data-taking information

• Dates of data-taking: 2024-08-26
  • • ZD range (deg): --> 20-80 deg
    • AZ range (deg): --> 100-200 deg
    • Observation condition: dark
    • Observation mode: std wobbles
    • Effective time: 4.042 h
    • Observations:

'2024-08-26': [18676, 18677, 18678, 18679, 18680, 18681, 18682, 18683, 18684, 18685, 18686, 18687, 18688, 18689] 

[[File: | 600 px]]

• Data quality selection: Almost runs did not survive the default dR/dI@442pe limit of 1.5.
• 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_26.pdf

General analysis information

• source-independent analysis
• lstchain version: v0.10.11
• DL1b standard production (v0.10/tailcut84), run-wise merged files in:

/fefs/aswg/data/real/DL1/20240826/v0.10/tailcut84/dl1_LST-1.Run18676.h5
/fefs/aswg/data/real/DL1/20240826/v0.10/tailcut84/dl1_LST-1.Run18677.h5
/fefs/aswg/data/real/DL1/20240826/v0.10/tailcut84/dl1_LST-1.Run18678.h5
/fefs/aswg/data/real/DL1/20240826/v0.10/tailcut84/dl1_LST-1.Run18679.h5
/fefs/aswg/data/real/DL1/20240826/v0.10/tailcut84/dl1_LST-1.Run18680.h5
/fefs/aswg/data/real/DL1/20240826/v0.10/tailcut84/dl1_LST-1.Run18681.h5
/fefs/aswg/data/real/DL1/20240826/v0.10/tailcut84/dl1_LST-1.Run18682.h5
/fefs/aswg/data/real/DL1/20240826/v0.10/tailcut84/dl1_LST-1.Run18683.h5
/fefs/aswg/data/real/DL1/20240826/v0.10/tailcut84/dl1_LST-1.Run18684.h5
/fefs/aswg/data/real/DL1/20240826/v0.10/tailcut84/dl1_LST-1.Run18685.h5
/fefs/aswg/data/real/DL1/20240826/v0.10/tailcut84/dl1_LST-1.Run18686.h5
/fefs/aswg/data/real/DL1/20240826/v0.10/tailcut84/dl1_LST-1.Run18687.h5
/fefs/aswg/data/real/DL1/20240826/v0.10/tailcut84/dl1_LST-1.Run18688.h5
/fefs/aswg/data/real/DL1/20240826/v0.10/tailcut84/dl1_LST-1.Run18689.h5

Monte Carlo information

• 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/helena.luciani/fast_offline_analysis/GRB240825A/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,
   "global_gh_cut": 0.7,
   "gh_efficiency": 0.7,
   "min_gh_cut": 0.1,
   "max_gh_cut": 0.98,
   "global_alpha_cut": 10,
   "global_theta_cut": 0.2,
   "theta_containment": 0.7,
   "alpha_containment": 0.7,
   "min_theta_cut": 0.1,
   "max_theta_cut": 0.32,
   "fill_theta_cut": 0.32,
   "min_alpha_cut": 1,
   "max_alpha_cut": 20,
   "fill_alpha_cut": 20,
   "allowed_tels": [1]
 }

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

Files in:

/fefs/aswg/workspace/helena.luciani/fast_offline_analysis/GRB240825A/DL3/

High-level analysis

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

Analysis Results

Theta2 plot

Settings:

• Theta2 cut for signal extraction: 0.04 deg2
• Normalization range: 0.1 - 0.4 deg2
• Number of off positions: [1,3]
• Energy range: 10 GeV - 10 TeV

Daily results

Dark NSB image cleaning: No detection

Significance and Excess sky maps