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XMMSL1 J171900.4-353217 : A new hard X-ray transient from the XMM-Newton Slew Survey

ATEL # 2607; A M Read (Leicester), R D Saxton (ESAC), P Esquej (Leicester)
on 10 May 2010; 11:40 UT
Password Certification: Dr. Andy Read (

Subjects: X-ray, Transients
Referred to by ATEL #: 2615, 2627, 2656, 2722, 2738, 2807

We report the discovery of XMMSL1 J171900.4-353217, a new hard X-ray transient, found in an XMM-Newton slew from 10th March 2010. The source position (2000.0) is RA:17 19 00.4 DEC:-35 32 17 with an 8'', 1 sigma error circle. No other XMM-Newton slew or XMM pointing has covered this sky position.

The source is bright and point-like. The 0.2-10 keV count rate was 4.5 ct/s in the EPIC-pn detector. The source is spectrally hard, with all of the detected photons in the 2-10 keV band. A power law fit to the rudimentary slew spectrum, using a fixed Galactic absorption out of our galaxy at this position (nH=1.0E22 cm-2), yields an approximate spectral slope of ~0.6.

There are no obvious catalogued counterparts within ~30 arcseconds of this source. There is one very faint (B~20) optical source (USNO-A2.0 0525-27889890) and four faint (J~16) 2MASS sources within the slew error circle. We welcome further observations to ascertain the true nature of the object.

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