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XMM-Newton Slew Survey discovers a new, bright X-ray transient, XMMSL1 J070542.7-381442

ATEL # 1282; A.M. Read (U. Leicester), R.D. Saxton (ESAC) and P.Esquej (MPE)
on 16 Nov 2007; 9:52 UT
Password Certification: Dr. Andy Read (

Subjects: X-ray, Transients
Referred to by ATEL #: 1285, 1301

ESA's XMM-Newton, in its Slew Survey mode, has detected a very bright (53.7 ct/s in EPIC-pn [0.2-2 keV]), new transient at a position of: RA, Dec (J2000) = 07:05:42.7 -38:14:42 (estimated error radius: 8 arcseconds). It was detected in an XMM-Newton Slew from 8th October 2007, and is seen to have increased in flux over the ROSAT All-Sky Survey (RASS) upper limit by a factor of more than 400. The source has been designated the name: XMMSL1 J070542.7-381442 The XMM-Newton Slew Survey spectrum is extremely soft, with essentially no counts above 1keV. This, together with the fact that the source is quite close to the Galactic plane and has a very large column density out of the Galaxy (nH~1.4e21 atoms/cm^2) indicates that the source is very likely Galactic in origin, and perhaps very close. The source may have an optical counterpart (USNO-A2.0 0450-03360039 : Bmag=15.7 Rmag=15.9).

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