Fast Offline Analysis 4C+27.50 July2024 P066

Fast offline analysis 4C+27.50 July 2024 P066

General information

• Name of the source: 4C+27.50
• Brief description of the source:
  • Object type : FSQR
  • Redshift (z) : 1.255
  • Other relevant information
  • RA, Dec in deg (ICRS): 350.49942593, 27.54623436

• Analysis by:
  • Roger Grau (IFAE - rgrau@ifae.es)

• Dates of data-taking:
  • Date: 2024-07-11 (1.07 h)
    • ZD range (deg): 30-45
    • Observations:

2024-07-11: [18197 18198 18199 18200]

• Data quality selection: cosmic rates are somewhat low. None of the runs survive the default dR/dI@442pe limit of 1.5. Likely due to high dust concentration
• Joint observations with MAGIC?: no
• Information on data-taking (observations summaries): https://www.lst1.iac.es/datacheck/observation_overview/2024/07/run_summary_2024_07_11.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/YYYYMMDD/v0.10/tailcut84/dl1_LST-1.Run?????.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_2276

Random forest

Path to the models used:

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

DL2 data

Config file:

Files in:

/fefs/aswg/workspace/roger.grau/fast_oa/4C/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

Files in:

/fefs/aswg/workspace/roger.grau/fast_oa/4C/DL3

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

• 2024-07-09: No detection

Spectral results

   name     value      error        unit     
--------- ---------- --------- --------------
    index 3.4232e+00 8.750e-01               
amplitude 9.7958e-10 1.267e-09 TeV-1 s-1 cm-2
reference 9.0000e+01 0.000e+00            GeV