GRB 070610: A curious galactic transient

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. K. Pollack, S. Barthelmy, J. Cummings, N. Gehrels, H. A. Krimm, C. B. Markwardt, G. Sato, P. Chandra, D. FrailD. B. Fox, P. A. Price, E. Berger, S. A. Grebenev, R. A. Krivonos, R. A. Sunyaev

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

GRB 070610 is a typical high-energy event with a duration of 5 s. 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 timescales even at late times. Using near-infrared imaging assisted by a laser guide star and adaptive optics, we identified the counterpart of Swift J195509.6+261406. Late-time optical and near-infrared imaging constrain the spectral type of the counterpart to be fainter than a K-dwarf, assuming it is of Galactic origin. It is possible that GRB 070610 and Swift J195509.6+261406 are unrelated sources. However, the absence of a typical X-ray afterglow from GRB 070610 in conjunction with the spatial and temporal coincidence of the two motivate us to suggest that the sources are related. The closest (imperfect) 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 subclass of stellar black hole binaries-the fast X-ray novae. We further suggest that fast X-ray novae are associated with bursts of gamma rays. If so, GRB 070610 defines a new class of celestial gamma-ray bursts and these bursts dominate the long-duration GRB demographics.

Original languageEnglish
Pages (from-to)1127-1135
Number of pages9
JournalAstrophysical Journal
Volume678
Issue number2
DOIs
Publication statusPublished - 2008 May 10

Keywords

  • Gamma rays: bursts
  • Stars: flare
  • X-rays: binaries
  • X-rays: bursts

ASJC Scopus subject areas

  • Space and Planetary Science

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    Kasliwal, M. M., Cenko, S. B., Kulkarni, S. R., Cameron, P. B., Nakar, E., Ofek, E. O., Rau, A., Soderberg, A. M., Campana, S., Bloom, J. S., Perley, D. A., Pollack, L. K., Barthelmy, S., Cummings, J., Gehrels, N., Krimm, H. A., Markwardt, C. B., Sato, G., Chandra, P., ... Sunyaev, R. A. (2008). GRB 070610: A curious galactic transient. Astrophysical Journal, 678(2), 1127-1135. https://doi.org/10.1086/526407