Analysis BLLac Oct 2022

BL Lacertae flare Oct 2022

General information

• Name of the source: BL Lacertae
• Brief description of the source:
  • IBL / LBL
  • highly variable
  • z = 0.069
  • RA: 22 02 43.3 (hh mm ss), Dec: +42 16 40 (dd mm ss)
  • RA, Dec in deg (ICRS): 330.68038, 42.277772

Data-taking information

• Dates of data-taking:
  • 2022-10-20 (2.5 h)
    • ZD: 16 - 42 deg
    • Transmission9km: n/a
    • Runs: 9753, 9754, 9755, 9756, 9757, 9758, 9759, 9760, 9761
    • Joint observations with MAGIC
    • https://www.lst1.iac.es/datacheck/observation_overview/2022/10/CameraDailyCheck20221020.pdf

DL1 data

Standard run-wise data files produced by LSTOSA.

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

/fefs/aswg/data/real/DL1/20221020/v0.9/tailcut84/

Fast analysis by Seiya Nozaki (source-dependent analysis)

DL2 data

• lstchain v0.9.6
• source-dependent

Significance of the detection

• 1 Off reflected position
• cut
  • intensity > 100
  • gammaness > 0.7
  • alpha < 10

• statistics
  • Number of ON events: 128864
  • Number of OFF events: 113599
  • Excess: 15265
  • Li&Ma significance: 31 sigma

DL3 analysis

• gammapy 0.20.1
• cut
  • intensity > 0
  • 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=20)

• 2022-10-20 (SED)

• 2022-10-20 (LC)
  • > 100 GeV: (6.29 +/- 0.20) x 1E-10 / (cm2 s)

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