VERITAS follow-up observation of the BL Lac blazar B2 1811+31 2020 Flare
Pablo Drake (1), Colin Adams (1) (for the VERITAS collaboration, (1), Columbia University in the City of New York)
TL;DR
This paper reports on VERITAS follow-up observations of a gamma-ray flare from the BL Lac object B2 1811+31 in 2020, analyzing the VHE gamma-ray data in conjunction with Fermi-LAT observations.
Contribution
It presents the first combined analysis of VERITAS and Fermi-LAT data for this specific flare, demonstrating the effectiveness of coordinated multiwavelength follow-up.
Findings
Detection of VHE gamma rays during the flare
Correlation between Fermi-LAT and VERITAS observations
Preliminary results support the flare's high-energy emission model
Abstract
VERITAS is an imaging atmospheric Cherenkov telescope (IACT) array most sensitive to gamma rays in the very-high-energy (VHE) energy band (85 GeV - 30 TeV). As a part of its active galactic nuclei (AGN) program, VERITAS focuses on the identification and follow-up of AGN flares reported by other multiwavelength observatories. Between October 15th and October 19th, 2020, VERITAS followed up on the Fermi-LAT and MAGIC detections of a flare of the intermediate-frequency-peaked BL Lacertae (IBL) object, B2 1811+31, located at a redshift of z=0.117. In this work, we present preliminary scientific results from the analysis of B2 1811+31's 2020 flare, including the corresponding Fermi-LAT light curve and VERITAS detection analysis.
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