Veritas observations of the unusual extragalactic transient swift J164449.3+573451

E. Aliu; T. Arlen; T. Aune; M. Beilicke; W. Benbow; M. Böttcher; A. Bouvier; S. M. Bradbury; J. H. Buckley; V. Bugaev; A. Cannon; A. Cesarini; L. Ciupik; E. Collins-Hughes; M. P. Connolly; W. Cui; R. Dickherber; M. Errando; A. Falcone; J. P. Finley; L. Fortson; A. Furniss; N. Galante; D. Gall; G. H. Gillanders; S. Godambe; S. Griffin; J. Grube; G. Gyuk; D. Hanna; J. Holder; H. Huan; G. Hughes; C. M. Hui; T. B. Humensky; P. Kaaret; N. Karlsson; M. Kertzman; D. Kieda; H. Krawczynski; F. Krennrich; A. S. Madhavan; G. Maier; P. Majumdar; S. McArthur; A. McCann; P. Moriarty; R. Mukherjee; R. A. Ong; M. Orr

doi:10.1088/2041-8205/738/2/L30

Veritas observations of the unusual extragalactic transient swift J164449.3+573451

E. Aliu, T. Arlen, T. Aune, M. Beilicke, W. Benbow, M. Böttcher, A. Bouvier, S. M. Bradbury, J. H. Buckley, V. Bugaev, A. Cannon, A. Cesarini, L. Ciupik, E. Collins-Hughes, M. P. Connolly, W. Cui, R. Dickherber, M. Errando, A. Falcone, J. P. FinleyL. Fortson, A. Furniss, N. Galante, D. Gall, G. H. Gillanders, S. Godambe, S. Griffin, J. Grube, G. Gyuk, D. Hanna, J. Holder, H. Huan, G. Hughes, C. M. Hui, T. B. Humensky, P. Kaaret, N. Karlsson, M. Kertzman, D. Kieda, H. Krawczynski, F. Krennrich, A. S. Madhavan, G. Maier, P. Majumdar, S. McArthur, A. McCann, P. Moriarty, R. Mukherjee, R. A. Ong, M. Orr

Physics and Astronomy (Twin Cities)

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Abstract

We report on very high energy (>100GeV) gamma-ray observations of Swift J164449.3+573451, an unusual transient object first detected by the Swift Observatory and later detected by multiple radio, optical, and X-ray observatories. A total exposure of 28hr was obtained on Swift J164449.3+573451 with the Very Energetic Radiation Imaging Telescope Array System (VERITAS) during 2011 March 28-April 15. We do not detect the source and place a differential upper limit on the emission at 500GeV during these observations of 1.4 × 10^-12ergcm^-2s^-1 (99% confidence level). We also present time-resolved upper limits and use a flux limit averaged over the X-ray flaring period to constrain various emission scenarios that can accommodate both the radio-through-X-ray emission detected from the source and the lack of detection by VERITAS.

Original language	English (US)
Article number	L30
Journal	Astrophysical Journal Letters
Volume	738
Issue number	2
DOIs	https://doi.org/10.1088/2041-8205/738/2/L30
State	Published - Sep 10 2011

Keywords

accretion, accretion disks
galaxies: active
gamma rays: galaxies
radiation mechanisms: non-thermal

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Aliu, E., Arlen, T., Aune, T., Beilicke, M., Benbow, W., Böttcher, M., Bouvier, A., Bradbury, S. M., Buckley, J. H., Bugaev, V., Cannon, A., Cesarini, A., Ciupik, L., Collins-Hughes, E., Connolly, M. P., Cui, W., Dickherber, R., Errando, M., Falcone, A., ... Orr, M. (2011). Veritas observations of the unusual extragalactic transient swift J164449.3+573451. Astrophysical Journal Letters, 738(2), Article L30. https://doi.org/10.1088/2041-8205/738/2/L30

Aliu, E, Arlen, T, Aune, T, Beilicke, M, Benbow, W, Böttcher, M, Bouvier, A, Bradbury, SM, Buckley, JH, Bugaev, V, Cannon, A, Cesarini, A, Ciupik, L, Collins-Hughes, E, Connolly, MP, Cui, W, Dickherber, R, Errando, M, Falcone, A, Finley, JP, Fortson, L, Furniss, A, Galante, N, Gall, D, Gillanders, GH, Godambe, S, Griffin, S, Grube, J, Gyuk, G, Hanna, D, Holder, J, Huan, H, Hughes, G, Hui, CM, Humensky, TB, Kaaret, P, Karlsson, N, Kertzman, M, Kieda, D, Krawczynski, H, Krennrich, F, Madhavan, AS, Maier, G, Majumdar, P, McArthur, S, McCann, A, Moriarty, P, Mukherjee, R, Ong, RA & Orr, M 2011, 'Veritas observations of the unusual extragalactic transient swift J164449.3+573451', Astrophysical Journal Letters, vol. 738, no. 2, L30. https://doi.org/10.1088/2041-8205/738/2/L30

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title = "Veritas observations of the unusual extragalactic transient swift J164449.3+573451",

abstract = "We report on very high energy (>100GeV) gamma-ray observations of Swift J164449.3+573451, an unusual transient object first detected by the Swift Observatory and later detected by multiple radio, optical, and X-ray observatories. A total exposure of 28hr was obtained on Swift J164449.3+573451 with the Very Energetic Radiation Imaging Telescope Array System (VERITAS) during 2011 March 28-April 15. We do not detect the source and place a differential upper limit on the emission at 500GeV during these observations of 1.4 × 10-12ergcm-2s-1 (99% confidence level). We also present time-resolved upper limits and use a flux limit averaged over the X-ray flaring period to constrain various emission scenarios that can accommodate both the radio-through-X-ray emission detected from the source and the lack of detection by VERITAS.",

keywords = "accretion, accretion disks, galaxies: active, gamma rays: galaxies, radiation mechanisms: non-thermal",

author = "E. Aliu and T. Arlen and T. Aune and M. Beilicke and W. Benbow and M. B{\"o}ttcher and A. Bouvier and Bradbury, {S. M.} and Buckley, {J. H.} and V. Bugaev and A. Cannon and A. Cesarini and L. Ciupik and E. Collins-Hughes and Connolly, {M. P.} and W. Cui and R. Dickherber and M. Errando and A. Falcone and Finley, {J. P.} and L. Fortson and A. Furniss and N. Galante and D. Gall and Gillanders, {G. H.} and S. Godambe and S. Griffin and J. Grube and G. Gyuk and D. Hanna and J. Holder and H. Huan and G. Hughes and Hui, {C. M.} and Humensky, {T. B.} and P. Kaaret and N. Karlsson and M. Kertzman and D. Kieda and H. Krawczynski and F. Krennrich and Madhavan, {A. S.} and G. Maier and P. Majumdar and S. McArthur and A. McCann and P. Moriarty and R. Mukherjee and Ong, {R. A.} and M. Orr",

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T1 - Veritas observations of the unusual extragalactic transient swift J164449.3+573451

AU - Aliu, E.

AU - Arlen, T.

AU - Aune, T.

AU - Beilicke, M.

AU - Benbow, W.

AU - Böttcher, M.

AU - Bouvier, A.

AU - Bradbury, S. M.

AU - Buckley, J. H.

AU - Bugaev, V.

AU - Cannon, A.

AU - Cesarini, A.

AU - Ciupik, L.

AU - Collins-Hughes, E.

AU - Connolly, M. P.

AU - Cui, W.

AU - Dickherber, R.

AU - Errando, M.

AU - Falcone, A.

AU - Finley, J. P.

AU - Fortson, L.

AU - Furniss, A.

AU - Galante, N.

AU - Gall, D.

AU - Gillanders, G. H.

AU - Godambe, S.

AU - Griffin, S.

AU - Grube, J.

AU - Gyuk, G.

AU - Hanna, D.

AU - Holder, J.

AU - Huan, H.

AU - Hughes, G.

AU - Hui, C. M.

AU - Humensky, T. B.

AU - Kaaret, P.

AU - Karlsson, N.

AU - Kertzman, M.

AU - Kieda, D.

AU - Krawczynski, H.

AU - Krennrich, F.

AU - Madhavan, A. S.

AU - Maier, G.

AU - Majumdar, P.

AU - McArthur, S.

AU - McCann, A.

AU - Moriarty, P.

AU - Mukherjee, R.

AU - Ong, R. A.

AU - Orr, M.

PY - 2011/9/10

Y1 - 2011/9/10

N2 - We report on very high energy (>100GeV) gamma-ray observations of Swift J164449.3+573451, an unusual transient object first detected by the Swift Observatory and later detected by multiple radio, optical, and X-ray observatories. A total exposure of 28hr was obtained on Swift J164449.3+573451 with the Very Energetic Radiation Imaging Telescope Array System (VERITAS) during 2011 March 28-April 15. We do not detect the source and place a differential upper limit on the emission at 500GeV during these observations of 1.4 × 10-12ergcm-2s-1 (99% confidence level). We also present time-resolved upper limits and use a flux limit averaged over the X-ray flaring period to constrain various emission scenarios that can accommodate both the radio-through-X-ray emission detected from the source and the lack of detection by VERITAS.

AB - We report on very high energy (>100GeV) gamma-ray observations of Swift J164449.3+573451, an unusual transient object first detected by the Swift Observatory and later detected by multiple radio, optical, and X-ray observatories. A total exposure of 28hr was obtained on Swift J164449.3+573451 with the Very Energetic Radiation Imaging Telescope Array System (VERITAS) during 2011 March 28-April 15. We do not detect the source and place a differential upper limit on the emission at 500GeV during these observations of 1.4 × 10-12ergcm-2s-1 (99% confidence level). We also present time-resolved upper limits and use a flux limit averaged over the X-ray flaring period to constrain various emission scenarios that can accommodate both the radio-through-X-ray emission detected from the source and the lack of detection by VERITAS.

KW - accretion, accretion disks

KW - galaxies: active

KW - gamma rays: galaxies

KW - radiation mechanisms: non-thermal

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U2 - 10.1088/2041-8205/738/2/L30

DO - 10.1088/2041-8205/738/2/L30

M3 - Article

AN - SCOPUS:80052318672

SN - 2041-8205

VL - 738

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2

M1 - L30

ER -

Veritas observations of the unusual extragalactic transient swift J164449.3+573451

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