Fast Offline Analysis 4C+27.50 September 2024 P068

Fast offline analysis 4C+27.50 September 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:
  • Joshua Baxter (ICRR, Univ. of Tokyo - joshua28@icrr.u-tokyo.ac.jp)

• Dates of data-taking:
  • Date: 2024-09-08 (1.8 h)
  • Date: 2024-09-09 (1.9 h)
  • Date: 2024-09-10 (1.8 h)
  • Date: 2024-09-11 (1.7 h)
  • Date: 2024-09-12 (1.7 h)
    • ZD range (deg): 0 deg - ~35 deg
    • Observations:

2024-09-08: [18948 18949 18950 18951 18952 18953]
2024-09-09: [18968 18969 18970 18971 18972 18973]
2024-09-10: [19004 19005 19006 19007 19008]
2024-09-11: [19024 19025 19026 19027 19028 19029]
2024-09-12: [19042 19043 19044 19045 19046 19047]

• Data quality selection:

Total number of runs: 21 (in 4 nights) Total observation time: 6.56 hours

20240908: [18948 18950 18951 18952 18953]

20240909: [18968 18969 18970 18971 18972 18973]

20240910: [19003 19004 19005 19006 19007 19008]

20240911: [19024 19027 19028 19029]

20240912: [19042 19043 19044 19045 19046 19047]

• Joint observations with MAGIC?: yes
• Information on data-taking (observations summaries):

https://www.lst1.iac.es/datacheck/observation_overview/2024/09/run_summary_2024_09_08.pdf, https://www.lst1.iac.es/datacheck/observation_overview/2024/09/run_summary_2024_09_09.pdf, https://www.lst1.iac.es/datacheck/observation_overview/2024/09/run_summary_2024_09_10.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:

/home/joshua.baxter/Work/LST-1_analysis/FOA/4C+27/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:

/home/joshua.baxter/Work/LST-1_analysis/FOA/4C+27/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

Stacked observations

• Theta2 plot (3 days data stacked, 20240908-20240910)

• Theta2 plot (4 days data stacked, 20240908-20240911)

• Theta2 plot (5 days data stacked, 20240908-20240912)

Spectral results

• 3 days data stacked (20240908-20240910)

• 4 days data stacked (20240908-20240911)

Light curve