Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2011-01-18
The Astrophysical Journal Letters, 729, L21 (2011)
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
5 pages, 3 figures, accepted for publication in ApJ Letters
Scientific paper
10.1088/2041-8205/729/2/L21
We report on a 63ks Chandra observation of the X-ray transient Swift J195509.6+261406 discovered as the afterglow of what was first believed to be a long duration Gamma-Ray Burst (GRB 070610). The outburst of this source was characterized by unique optical flares on timescales of second or less, morphologically similar to the short X-ray bursts usually observed from magnetars. Our Chandra observation was performed ~2 years after the discovery of the optical and X-ray flaring activity of this source, catching it in its quiescent state. We derive stringent upper limits on the quiescent emission of Swif J195509.6+261406 which argues against the possibility of this object being a typical magnetar. Our limits show that the most viable interpretation on the nature of this peculiar bursting source, is a binary system hosting a black hole or a neutron star with a low mass companion star (< 0.12 M_{\odot}), and with an orbital period smaller than a few hours.
Jonker Peter G.
Kasliwal Mansi M.
Kulkarni Sanjeev R.
Nelemans Gija
Pons Jose A.
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