Analysis NGC1275 Dec 2022 source dep Nozaki

NGC1275 flare Dec 2022

Data-taking information

• Dates of data-taking:
  • 2022-12-20
    • ZD: 39 - 50 deg
    • Transmission9km: n/a
    • Runs: 11522, 11528, 11529, 11530, 11531

DL1 data

Standard run-wise data files produced by LSTOSA.

• tailcut 8-4 (with cleaning based on pedestal RMS)

/fefs/aswg/data/real/DL1/20221220/v0.9/tailcut84/

Fast analysis by Seiya Nozaki (source-dependent analysis)

DL2 data

• lstchain v0.9.6
• source-dependent

/fefs/aswg/workspace/seiya.nozaki/BLLac_paper/dec3476_4822_merged/all_az_srcdep/RF/trained_models/

Significance of the detection

• 1 Off reflected position
• cut
  • intensity > 50
  • gammaness > 0.8
  • alpha < 10

• statistics
  • Number of ON events: 34837
  • Number of OFF events: 32825
  • Excess: 2012
  • Li&Ma significance: 7.7 sigma

DL3 analysis

• gammapy 0.20.1
• cut
  • intensity > 50
  • r: [0, 1]
  • wl: [0.01, 1]
  • event_type = 32
  • 70% efficiency gammaness cut (min_gh_cut=0.1, max_gh_cut=0.95
  • 70% efficiency gammaness cut (min_alpha_cut=1, min_alpha_cut=45)

• 2022-12-20 (SED)

• 2022-12-20 (LC)

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