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A Tale of Two Transients: GW 170104 and GRB 170105A

Authors :: R. M. Quimby
Santosh V. Vadawale
R. P. Fender
M. M. Kasliwal
A. R. Rao
Vidushi Sharma
Alessandra Corsi
D. A. Perley
Harish Vedantham
Varun Bhalerao
S. B. Cenko
Albert K. H. Kong
Sylvain Veilleux
J. E. Jencson
Dipankar Bhattacharya
A. Vibhute
N. Blagorodnova
A. Kutyrev
Thomas Kupfer
E. Aarthy
E. Troja
Dale A. Frail
T. M. Cantwell
Kunal Mooley
R. Itoh
N. P. S. Mithun
Sujay Mate
N. Kawai
Y. C. Perrott
Scott M. Adams
David Titterington
Junjie Mao
Leo Singer
Source :: Bhalerao, V, Kasliwal, M M, Bhattacharya, D, Corsi, A, Aarthy, E, Adams, S M, Blagorodnova, N, Cantwell, T, Cenko, S B, Fender, R, Frail, D, Itoh, R, Jencson, J, Kawai, N, Kong, A K H, Kupfer, T, Kutyrev, A, Mao, J, Mate, S, Mithun, N P S, Mooley, K, Perley, D A, Perrott, Y C, Quimby, R M, Rao, A R, Singer, L P, Sharma, V, Titterington, D J, Troja, E, Vadawale, S V, Vibhute, A, Vedantham, H & Veilleux, S 2017, ' A Tale of Two Transients : GW 170104 and GRB 170105A ', Astrophysical Journal, vol. 845, no. 2, 152 . https://doi.org/10.3847/1538-4357/aa81d2
Publication Year :: 2017
Publisher :: American Astronomical Society, 2017.
Abstract: We present multi-wavelength follow-up campaigns by the AstroSat-CZTI and GROWTH collaborations to search for an electromagnetic counterpart to the gravitational wave event GW170104. At the time of the GW170104 trigger, the AstroSat CZTI field-of-view covered 50.3\% of the sky localization. We do not detect any hard X-ray (>100 keV) signal at this time, and place an upper limit of $\approx 4.5 \times 10^{-7}~{\rm erg~cm}^{-2}{\rm~s}^{-1}$ for a 1\,s timescale. Separately, the ATLAS survey reported a rapidly fading optical source dubbed ATLAS17aeu in the error circle of GW170104. Our panchromatic investigation of ATLAS17aeu shows that it is the afterglow of an unrelated long, soft GRB~170105A, with only a fortuitous spatial coincidence with GW170104. We then discuss the properties of this transient in the context of standard long GRB afterglow models.<br />Comment: ApJ accepted - updated to match version, 14 pages, 8 figures, 3 tables