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; L. Fortson; A. Furniss; G. H. Gillanders; O. Gueta; D. Hanna; O. Hervet; J. Holder; G. 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; C. Rulten; I. Sadeh; M. Santander; S. S. Scott; G. H. Sembroski; K. 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

doi:10.3847/2041-8213/aad053

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
, L. Fortson
, A. Furniss
, G. H. Gillanders
, O. Gueta
, D. Hanna
, O. Hervet
, J. Holder

G. 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, C. Rulten, I. Sadeh, M. Santander, S. S. Scott, G. H. Sembroski, K. 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

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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 language	English (US)
Article number	L20
Journal	Astrophysical Journal Letters
Volume	861
Issue number	2
DOIs	https://doi.org/10.3847/2041-8213/aad053
State	Published - Jul 10 2018

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/2041-8213/aad053

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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, L., Furniss, A., Gillanders, G. H., Gueta, O., Hanna, D., Hervet, O., ... Kaur, A. (2018). VERITAS Observations of the BL Lac Object TXS 0506+056. Astrophysical Journal Letters, 861(2), Article L20. https://doi.org/10.3847/2041-8213/aad053

@article{88d4fbd607734e698ba9d5e15015855f,

title = "VERITAS Observations of the BL Lac Object TXS 0506+056",

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.",

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

year = "2018",

month = jul,

day = "10",

doi = "10.3847/2041-8213/aad053",

language = "English (US)",

volume = "861",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "American Astronomical Society",

number = "2",

}

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 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

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, L.

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, C.

AU - Sadeh, I.

AU - Santander, M.

AU - Scott, S. S.

AU - Sembroski, G. H.

AU - Shahinyan, K.

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.

UR - https://www.scopus.com/pages/publications/85050004763

UR - https://www.scopus.com/pages/publications/85050004763#tab=citedBy

U2 - 10.3847/2041-8213/aad053

DO - 10.3847/2041-8213/aad053

M3 - Article

AN - SCOPUS:85050004763

SN - 2041-8205

VL - 861

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2

M1 - L20

ER -

VERITAS Observations of the BL Lac Object TXS 0506+056

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