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Abeysekara, AU,Archer, A,Benbow, W,Bird, R,Brill, A,Brose, R,Buckley, JH,Christiansen, JL,Chromey, AJ,Daniel, MK,Falcone, A,Feng, Q,Finley, JP,Fortson, L,Furniss, A,Gillanders, GH,Gueta, O,Hanna, D,Hervet, O,Holder, J,Hughes, G,Humensky, TB,Johnson, CA,Kaaret, P,Kar, P,Kelley-Hoskins, N,Kertzman, M,Kieda, D,Krause, M,Krennrich, F,Lang, MJ,Moriarty, P,Mukherjee, R,O'Brien, S,Ong, RA,Otte, AN,Park, N,Petrashyk, A,Pohl, M,Pueschel, E,Quinn, J,Ragan, K,Reynolds, PT,Richards, GT,Roache, E,Rulten, C,Sadeh, I,Santander, M,Scott, SS,Sembroski, GH,Shahinyan, K,Tyler, J,Wakely, SP,Weinstein, A,Wells, RM,Wilcox, P,Wilhelm, A,Williams, DA,Williamson, TJ,Zitzer, B,Kaur, A,VERITAS Collaboration
Astrophysical Journal Letters
VERITAS Observations of the BL Lac Object TXS 0506+056
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astroparticle physics BL Lacertae objects: individual (TXS 0506+056, VER J0509+057) gamma rays: galaxies quasars: general neutrinos ACTIVE GALACTIC NUCLEI TELESCOPE RADIATION MISSION BLAZAR I.
On 2017 September 22, the IceCube Neutrino Observatory reported the detection of the high-energy neutrino event IC 170922A, of potential astrophysical origin. It was soon determined that the neutrino direction was consistent with the location of the gamma-ray blazar TXS 0506+056. (3FGL J0509.4+ 0541), which was in an elevated gamma-ray emission state as measured by the Fermi satellite. Very Energetic Radiation Imaging Telescope Array System (VERITAS) observations of the neutrino/blazar region started on 2017 September 23 in response to the neutrino alert and continued through 2018 February 6. While no significant very-high-energy (VHE; E > 100 GeV) emission was observed from the blazar by VERITAS in the two-week period immediately following the IceCube alert, TXS 0506+ 056 was detected by VERITAS with a significance of 5.8 standard deviations (sigma) in the full 35 hr data set. The average photon flux of the source during this period was (8.9 +/- 1.6). x. 10(-12) cm(-2) s(-1), or 1.6% of the Crab Nebula flux, above an energy threshold of 110 GeV, with a soft spectral index of 4.8. +/-. 1.3.
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