Analysis BLLac Oct 2022

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BL Lacertae flare July 2021

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
  • Analysis by Daniel Morcuende (UCM, Madrid - dmorcuen@ucm.es)

Data-taking information

  • Dates of data-taking:
    • 2022-10-20 (0.41 h)
      • ZD: 23 - 26 deg
      • Transmission9km: ~90%
      • Runs: 5219, 5220
      • Joint observations with MAGIC


DL2 data

Standard run-wise data files produced by LSTOSA.

  • lstchain v0.7.3
  • tailcut 8-4 (with cleaning based on pedestal RMS)
/fefs/aswg/data/real/DL2/20210709/v0.7.3/tailcut84/dl2_LST-1.Run05219.h5
/fefs/aswg/data/real/DL2/20210709/v0.7.3/tailcut84/dl2_LST-1.Run05220.h5
/fefs/aswg/data/real/DL2/20210710/v0.7.3/tailcut84/dl2_LST-1.Run05229.h5
/fefs/aswg/data/real/DL2/20210710/v0.7.3/tailcut84/dl2_LST-1.Run05230.h5
/fefs/aswg/data/real/DL2/20210710/v0.7.3/tailcut84/dl2_LST-1.Run05231.h5
/fefs/aswg/data/real/DL2/20210710/v0.7.3/tailcut84/dl2_LST-1.Run05232.h5
/fefs/aswg/data/real/DL2/20210710/v0.7.3/tailcut84/dl2_LST-1.Run05233.h5
/fefs/aswg/data/real/DL2/20210710/v0.7.3/tailcut84/dl2_LST-1.Run05234.h5
/fefs/aswg/data/real/DL2/20210710/v0.7.3/tailcut84/dl2_LST-1.Run05235.h5
/fefs/aswg/data/real/DL2/20210712/v0.7.3/tailcut84/dl2_LST-1.Run05251.h5
/fefs/aswg/data/real/DL2/20210712/v0.7.3/tailcut84/dl2_LST-1.Run05252.h5

DL3 data selection

  • intensity > 30
  • r: [0, 1 ]
  • wl: [0.05, 1]
  • leakage_intensity_width_2: [0, 0.2 ]
  • fixed_gh_cut: 0.7
  • fixed_theta_cut: 0.2

High-level analysis

Significance of the detection

1 Off reflected position
Theta2 cut: 0.04 deg
  • Squares: Background
  • Circles: Signal events

Date: 2021-07-09

  • List of runs: [5219, 5220]
  • Observation time: 0.41 h
  • Number of ON events: 257
  • Number of OFF events: 234 +/- 15
  • Excess: 23 +/- 22
  • Li&Ma significance: 1.0 sigma

Theta2 BLLac 2021-07-09 DMorcuende.png

Date: 2021-07-10

  • List of runs: [5229, 5230, 5231, 5232, 5233, 5234, 5235]
  • Observation time: 1.56 h
  • Number of ON events: 598
  • Number of OFF events: 351 +/- 19
  • Excess: 247 +/- 31
  • Li&Ma significance: 8.1 sigma

Theta2 BLLac 2021-07-10 DMorcuende.png

Date: 2021-07-12

  • List of runs: [5251, 5252]
  • Observation time: 0.49 h
  • Number of ON events: 26
  • Number of OFF events: 31 +/- 6
  • Excess: -5 +/- 8
  • Li&Ma significance: -0.7 sigma

Theta2 BLLac 2021-07-12 DMorcuende.png

Date: 2021-07-15

500px

Stacked

  • List of runs: [5219, 5220, 5229, 5230, 5231, 5232, 5233, 5234, 5235, 5251, 5252]
  • Observation time: 2.46 h
  • Number of ON events: 881
  • Number of OFF events: 616 +/- 25
  • Excess: 265 +/- 39
  • Li&Ma significance: 6.9 sigma

Theta2 BLLac Stacked DMorcuende.png

Spectral analysis

Effective area

Aeff BLLac.png


Migration Matrix and exposure

Migration matrix exposure BLLac 2021-09-10.png


  • 2021-07-10

SED PWL 2021-07-10 DMorcuende.png

  • PowerLaw fit:
    • index: 3.5 +/- 0.2
    • E_ref: 0.1 TeV
    • amplitude: 1.3 +/- 0.2 10^-9 cm-2 s-1 TeV-1

Residuals Excess energy.png


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