The Astronomer's Telegram
Telegram Index | Search
To The Parent Site

[ Previous | Next ]

IGR J17375-3022 - caught in outburst again by XMM-Newton

ATEL # 2027; R D Saxton ESAC), A M Read (Leicester), P, Esquej (Leicester), E. Kuulkers (ESAC), A. Ibarra (ESAC)
on 22 Apr 2009; 22:58 UT
Distributed as an Instant Email Notice (Transients)
Password Certification: Richard Saxton (

Subjects: X-ray, Transients

The INTEGRAL source IGR J17375-3022 was discovered on 2008 October 10 (Ricci et al. 2008, ATel #1781) and faded below the detection levels within a few days, before October 17-19 (Cadolle Bel et al. 2008, Atel #1810). XMM-Newton has made a strong detection of the Integral source, while performing a slew between targets on 2009-04-01 16:00:00 U.T.

A point-like source with 14 photons in the hard (2-12 keV) band and 3 photons in the soft (0.2-2 keV) band, was detected at a position RA: 17deg 37' 33.2", Dec: -30deg 23' 14" (J2000.0), with a 1-sigma error of 8". This is 9" from the best X-ray position reported by SWIFT (Beckmann et al. 2008, ATel #1783)

Using the SWIFT/XRT derived spectral model of an absorbed power-law with total (Galactic + intrinsic) column density of 2.8e22 /cm**2 and slope=2.3 (Beckmann et al. 2008, ATel #1783), and the PIMMS count rate converter, we infer a 2-10 keV flux of 9.8 (+/-2.7) e-11 erg/cm**2/sec, for the XMM-Newton source, a few times higher than the SWIFT flux of October 14 2008.

The inferred soft X-ray (0.2-2 keV) flux is 3.3e-12 erg/cm**2/sec, which is a factor 10 higher than the 2-sigma upper limit from the ROSAT All-Sky Survey.

We encourage sensitive follow up observations of the source to see if it is still in outburst.

[ Telegram Index ]

R. E. Rutledge , Editor
ATEL Mirror v1.0 Updates