VERITAS Observations of the BL Lac Object TXS 0506+056

A. U. Abeysekara, A. Archer, W. Benbow, R. Bird, A. Brill, R. Brose, J. H. Buckley, J. L. Christiansen, A. J. Chromey, M. K. Daniel, A. Falcone, Q. Feng, J. P. Finley, Lucy F Fortson, A. Furniss, G. H. Gillanders, O. Gueta, D. Hanna, O. Hervet, J. HolderG. Hughes, T. B. Humensky, C. A. Johnson, P. Kaaret, P. Kar, N. Kelley-Hoskins, M. Kertzman, D. Kieda, M. Krause, F. Krennrich, M. J. Lang, P. Moriarty, R. Mukherjee, S. O'Brien, R. A. Ong, A. N. Otte, N. Park, A. Petrashyk, M. Pohl, E. Pueschel, J. Quinn, K. Ragan, P. T. Reynolds, G. T. Richards, E. Roache, Cameron B Rulten, I. Sadeh, M. Santander, S. S. Scott, G. H. Sembroski, Karlen Shahinyan, J. Tyler, S. P. Wakely, A. Weinstein, R. M. Wells, P. Wilcox, A. Wilhelm, D. A. Williams, T. J. Williamson, B. Zitzer, A. Kaur

Research output: Contribution to journalArticle

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Abstract

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 (σ) in the full 35 hr data set. The average photon flux of the source during this period was (8.9 1.6) 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.

Original languageEnglish (US)
Article numberL20
JournalAstrophysical Journal Letters
Volume861
Issue number2
DOIs
StatePublished - Jul 10 2018

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energetics
neutrinos
telescopes
radiation
energy
gamma rays
crab
Crab nebula
observatory
standard deviation
observatories
astrophysics
thresholds
photons
detection
index

Keywords

  • BL Lacertae objects: individual (TXS 0506+056, VER J0509+057)
  • astroparticle physics
  • gamma rays: galaxies
  • neutrinos
  • quasars: general

Cite this

Abeysekara, A. U., Archer, A., Benbow, W., Bird, R., Brill, A., Brose, R., ... Kaur, A. (2018). VERITAS Observations of the BL Lac Object TXS 0506+056. Astrophysical Journal Letters, 861(2), [L20]. https://doi.org/10.3847/2041-8213/aad053

VERITAS Observations of the BL Lac Object TXS 0506+056. / Abeysekara, A. U.; Archer, A.; Benbow, W.; Bird, R.; Brill, A.; Brose, R.; Buckley, J. H.; Christiansen, J. L.; Chromey, A. J.; Daniel, M. K.; Falcone, A.; Feng, Q.; Finley, J. P.; Fortson, Lucy F; Furniss, A.; Gillanders, G. H.; Gueta, O.; Hanna, D.; Hervet, O.; Holder, J.; Hughes, G.; Humensky, T. B.; Johnson, C. A.; Kaaret, P.; Kar, P.; Kelley-Hoskins, N.; Kertzman, M.; Kieda, D.; Krause, M.; Krennrich, F.; Lang, M. J.; Moriarty, P.; Mukherjee, R.; O'Brien, S.; Ong, R. A.; Otte, A. N.; Park, N.; Petrashyk, A.; Pohl, M.; Pueschel, E.; Quinn, J.; Ragan, K.; Reynolds, P. T.; Richards, G. T.; Roache, E.; Rulten, Cameron B; Sadeh, I.; Santander, M.; Scott, S. S.; Sembroski, G. H.; Shahinyan, Karlen; Tyler, J.; Wakely, S. P.; Weinstein, A.; Wells, R. M.; Wilcox, P.; Wilhelm, A.; Williams, D. A.; Williamson, T. J.; Zitzer, B.; Kaur, A.

In: Astrophysical Journal Letters, Vol. 861, No. 2, L20, 10.07.2018.

Research output: Contribution to journalArticle

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, LF, 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, CB, 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 2018, 'VERITAS Observations of the BL Lac Object TXS 0506+056', Astrophysical Journal Letters, vol. 861, no. 2, L20. https://doi.org/10.3847/2041-8213/aad053
Abeysekara AU, Archer A, Benbow W, Bird R, Brill A, Brose R et al. VERITAS Observations of the BL Lac Object TXS 0506+056. Astrophysical Journal Letters. 2018 Jul 10;861(2). L20. https://doi.org/10.3847/2041-8213/aad053
Abeysekara, A. U. ; Archer, A. ; Benbow, W. ; Bird, R. ; Brill, A. ; Brose, R. ; Buckley, J. H. ; Christiansen, J. L. ; Chromey, A. J. ; Daniel, M. K. ; Falcone, A. ; Feng, Q. ; Finley, J. P. ; Fortson, Lucy F ; Furniss, A. ; Gillanders, G. H. ; Gueta, O. ; Hanna, D. ; Hervet, O. ; Holder, J. ; Hughes, G. ; Humensky, T. B. ; Johnson, C. A. ; Kaaret, P. ; Kar, P. ; Kelley-Hoskins, N. ; Kertzman, M. ; Kieda, D. ; Krause, M. ; Krennrich, F. ; Lang, M. J. ; Moriarty, P. ; Mukherjee, R. ; O'Brien, S. ; Ong, R. A. ; Otte, A. N. ; Park, N. ; Petrashyk, A. ; Pohl, M. ; Pueschel, E. ; Quinn, J. ; Ragan, K. ; Reynolds, P. T. ; Richards, G. T. ; Roache, E. ; Rulten, Cameron B ; Sadeh, I. ; Santander, M. ; Scott, S. S. ; Sembroski, G. H. ; Shahinyan, Karlen ; Tyler, J. ; Wakely, S. P. ; Weinstein, A. ; Wells, R. M. ; Wilcox, P. ; Wilhelm, A. ; Williams, D. A. ; Williamson, T. J. ; Zitzer, B. ; Kaur, A. / VERITAS Observations of the BL Lac Object TXS 0506+056. In: Astrophysical Journal Letters. 2018 ; Vol. 861, No. 2.
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abstract = "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 (σ) in the full 35 hr data set. The average photon flux of the source during this period was (8.9 1.6) 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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TY - JOUR

T1 - VERITAS Observations of the BL Lac Object TXS 0506+056

AU - Abeysekara, A. U.

AU - Archer, A.

AU - Benbow, W.

AU - Bird, R.

AU - Brill, A.

AU - Brose, R.

AU - Buckley, J. H.

AU - Christiansen, J. L.

AU - Chromey, A. J.

AU - Daniel, M. K.

AU - Falcone, A.

AU - Feng, Q.

AU - Finley, J. P.

AU - Fortson, Lucy F

AU - Furniss, A.

AU - Gillanders, G. H.

AU - Gueta, O.

AU - Hanna, D.

AU - Hervet, O.

AU - Holder, J.

AU - Hughes, G.

AU - Humensky, T. B.

AU - Johnson, C. A.

AU - Kaaret, P.

AU - Kar, P.

AU - Kelley-Hoskins, N.

AU - Kertzman, M.

AU - Kieda, D.

AU - Krause, M.

AU - Krennrich, F.

AU - Lang, M. J.

AU - Moriarty, P.

AU - Mukherjee, R.

AU - O'Brien, S.

AU - Ong, R. A.

AU - Otte, A. N.

AU - Park, N.

AU - Petrashyk, A.

AU - Pohl, M.

AU - Pueschel, E.

AU - Quinn, J.

AU - Ragan, K.

AU - Reynolds, P. T.

AU - Richards, G. T.

AU - Roache, E.

AU - Rulten, Cameron B

AU - Sadeh, I.

AU - Santander, M.

AU - Scott, S. S.

AU - Sembroski, G. H.

AU - Shahinyan, Karlen

AU - Tyler, J.

AU - Wakely, S. P.

AU - Weinstein, A.

AU - Wells, R. M.

AU - Wilcox, P.

AU - Wilhelm, A.

AU - Williams, D. A.

AU - Williamson, T. J.

AU - Zitzer, B.

AU - Kaur, A.

PY - 2018/7/10

Y1 - 2018/7/10

N2 - 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 (σ) in the full 35 hr data set. The average photon flux of the source during this period was (8.9 1.6) 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.

AB - 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 (σ) in the full 35 hr data set. The average photon flux of the source during this period was (8.9 1.6) 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.

KW - BL Lacertae objects: individual (TXS 0506+056, VER J0509+057)

KW - astroparticle physics

KW - gamma rays: galaxies

KW - neutrinos

KW - quasars: general

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