Fast Offline Analysis S240915b September 2024 P068

General information

• Name of the source: S240915b
• Brief description of the source: compact binary merger candidate. The classification of the GW signal is BBH (86%), NSBH (14%), Terrestrial (<1%), or BNS (<1%)
  • Object type :
  • Redshift (z) :
  • Other relevant information
  • RA, Dec in deg (ICRS): 331.5, 73.1 (pointing coordinates)

• Analysis by:
  • Helena Luciani (University of Trieste - helena.luciani@phd.units.it)

Data-taking information

• Dates of data-taking: 2024-09-14
  • • time of observations: 1.2 hours
    • ZD range (deg): 50 - 70
    • ON-mode observations
    • Observations:

20240914 : [19076, 19077]

• Joint observations with MAGIC?: No
• Information on data-taking (observations summaries): https://www.lst1.iac.es/datacheck/observation_overview/2024/09/run_summary_2024_09_14.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/DL1/20240911/v0.10/tailcut84/dl1_LST-1.Run19076.h5
/fefs/aswg/data/real/DL1/20240911/v0.10/tailcut84/dl1_LST-1.Run19077.h5

Monte Carlo information

• All-sky MC production used: 20240131_allsky_v0.10.5_all_dec_base
• Declination line (training): dec_6676

Random forest

Path to the models used:

/fefs/aswg/data/models/AllSky/20240131_allsky_v0.10.5_all_dec_base/dec_6676/

DL2 data

Config file:

/fefs/aswg/data/models/AllSky/20240131_allsky_v0.10.5_all_dec_base/dec_6676/lstchain_config_2024-01-31.json

Files in:

/fefs/aswg/workspace/helena.luciani/fast_offline_analysis/gw_alert_S240915b/DL2

DL3 data & IRF

Files in:

/fefs/aswg/workspace/helena.luciani/fast_offline_analysis/gw_alert_S240915b/DL3

Configuration used for producing IRF/DL3 files (you can leave standard settings):

 "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": 0.95,
   "min_theta_cut": 0.0,
   "max_theta_cut": 0.2,
   "fill_theta_cut": 0.2,
   "allowed_tels": [1]
 },

• Standard cuts: Intensity > 50 p.e., 70 % efficiency for both gammaness and theta gamma-ray selection energy-dependent 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:
• Number of off positions: 3
• Energy range: 0 - 100 TeV

No detection

Sky map