Kasliwal GRB070610可能是银河系内的一个暴

主要内容:
先看到了这个暴，5s。然后在相同的位置看到了X射线和光学瞬变体Swift J195509.6+261406，如果它们是同一个源，那么GRB 070610就是一个银河系内的暴，而且是一类新的 长暴（它的能量不像一般长暴那么大嘛）。

精彩摘抄:
X 射线，黑色的。
光学波段。

文章信息:

arXiv:0708.0226 [ps, pdf, other]

Title: GRB070610 : A Curious Galactic Transient

Authors: M. M. Kasliwal, S. B. Cenko, S. R. Kulkarni, P. B. Cameron, E. Nakar, E. O. Ofek, A. Rau, A. M. Soderberg, S. Campana, J. S. Bloom, D. A. Perley, L. Pollack, S. Barthelmy, J. Cummings, N. Gehrels, H. A. Krimm, C. B. Markwardt, G. Sato, P. Chandra, D. Frail, D. B. Fox, P. Price, E. Berger, S. A. Grebenev, R. A. Krivonos, R. A. Sunyaev

Comments: Submitted to ApJ, 17 pages, 11 figures, 5 tables ; Full resolution figures at this http URL

Subjects: Astrophysics (astro-ph)

GRB070610 is a typical high-energy event with a duration of 5s. Yet within the burst localization we detect a highly unusual X-ray and optical transient, Swift J195509.6+261406. We see high amplitude X-ray and optical variability on very short time scales even at late times. Using near-infrared imaging assisted by a laser guide star and adaptive optics, we have identified a quiescent counterpart to Swift J195509.6+261406. Our spectroscopic observations show that the spectral type of the counterpart is likely a K dwarf/sub-giant. It is possible that GRB070610 and Swift J195509.6+261406 are unrelated sources. However, the absence of a typical X-ray afterglow from GRB070610 in conjunction with the spatial and temporal coincidence of GRB070610 and Swift J195509.6+261406 motivate us to suggest that the sources are related. The closest analog to Swift J195509.6+261406 is V4641 Sgr, an unusual black hole binary. We suggest that Swift J195509.6+261406 along with V4641 Sgr define a sub-class of stellar black holes -- the fast X-ray novae. We further suggest that fast X-ray novae are associated with bursts of gamma-rays. If so, GRB070610 defines a new class of gamma-ray bursts and these bursts dominate the long-duration GRB demographics.