Castro-Tirado 2008 SWIFT J195509+261406可能是SGR，有光学观测

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Title:		Optical and infrared flares from a transient Galactic soft gamma-ray repeater
Authors:		Castro-Tirado, A. J.; de Ugarte Postigo, A.; Gorosabel, J.; Jelinek, M.; Fatkhullin, T. A.; Sokolov, V. V.; Ferrero, P.; Kann, D. A.; Klose, S.; Sluse, D.; Bremer, M.; Winters, J. M.; Nuernberger, D.; Perez-Ramirez, D.; Guerrero, M. A.; French, J.; Melady, G.; Hanlon, L.; McBreen, B.; Aceituno, F. J.; Cunniffe, R.; Kubanek, P.; Vitek, S.; Schulze, S.; Wilson, A. C.; Hudec, R.; Gonzalez-Perez, J. M.; Shahbaz, T.; Guziy, S.; Pandey, S. B.; Pavlenko, L.; Sonbas, E.; Trushkin, S. A.; Bursov, N. N.; Nizhelskij, N. A.; Sabau-Graziati, L.
Publication:		eprint arXiv:0809.4231
Publication Date:		09/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		Version submitted to Nature on 31 Jan 2008. A substantially revised version of this work has been published in Nature, vol. 455 issue 7212 pp 506-509 under the title "Flares from a Galactic magnetar suggest a missing link to dim isolated neutron stars"; Nature, 25 September 2008 vol 455 issue 7212 pp506-509; doi:10.1038/nature07328
Bibliographic Code:		2008arXiv0809.4231C

Abstract

Soft gamma-ray repeaters (SGRs) are a rare type of gamma-ray transient sources that are ocasionally detected as bursts in the high-energy sky. They are thought to be produced by magnetars, young neutron stars with very strong magnetic fields of the order of 10^(14-15) G. Only three such objects are known in our Galaxy, and a fourth one is associated with the supernova remnant N49 in the Large Magellanic Cloud. In none of these cases has an optical counterpart to either the gamma-ray flares or the quiescent source been identified. Here we present multi-wavelength observations of a puzzling source, SWIFT J195509+261406, for which we detected more than 40 flaring episodes in the optical band over a time span of 3 days, plus a faint infrared flare 11 days later, after which it returned to quiescence. We propose that SWIFT J195509+261406 is a member of a subgroup of SGRs for which the long-term X-ray emission is transient in nature. Furthermore, it is the first SGR for which bursts have been detected in the optical and near-infrared bands and maybe the link between the "persistent" SGRs and the dim isolated neutron stars.

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