Analysis BLLac July 2021

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

Data-taking information

• Dates of data-taking:
  • 2021-07-09 (~0.4 h)
    • ZD: 23 - 26 deg
    • Transmission9km: ~90%
    • Runs: 5219, 5220
    • Joint observations with MAGIC

• • 2021-07-10 (~1.6 h)
    • ZD: 20 - 40 deg
    • Transmission9km: 50% - 60%
    • Runs: 5229 - 5235
    • Joint observations with MAGIC (runs 5229, 5230)

• • 2021-07-12 (~1.6 h)
    • ZD: 43 - 47 deg
    • Transmission9km: < 50%
    • Runs: 5251 - 5252
    • 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: 0.1

Significance of the detection

• 2021-07-09:

1 Off reflected position
Observation time: 0.41 h
Number of ON events: 319
Number of OFF events: 208 +/- 14
Excess: 111 +/- 23
Li&Ma significance: 4.9 sigma

• 2021-07-10:

• 2021-07-12:

• Stacked

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