[ Previous | Next | ADS ]

Improved (and revised) position of IGR J19140+0951 with INTEGRAL

ATel #272; C. Cabanac (LAOG, Grenoble), J. Rodriguez (CEA Saclay & ISDC, Versoix), D. Hannikainen (Observatory, Helsinki), N. Lund (DSRI, Copenhagen), P-O. Petrucci (LAOG, Grenoble), G. Henri (LAOG, Grenoble), P. Durouchoux (CEA, Saclay), J. Schultz (Observatory, Helsinki)
on 19 Apr 2004; 11:48 UT
Credential Certification: Clement Cabanac (ccabanac@obs.ujf-grenoble.fr)

Subjects: X-ray, Gamma Ray, AGN, Binary, Transient

We have analysed about 300 ks of JEM-X2 data and about 600ks of IBIS/ISGRI data in order to constrain with more accuracy the position of the transient IGR J19140+0951 (formerly known as IGR J19140+098).

Based on 12 independent detections of the source in JEM-X2 and using JEM-X offline software (Lund et al., 2004) we have derived a weighted mean position. The new position (uncertainty at 90% : 1.7 arcmin) is 2.4 arcmin away from the first position derived with IBIS (IAUC # 8088 ) obtained using early versions of the Offline Scientific Analysis Software.

To cross check the JEM-X2 improved position, we reanalysed the whole IBIS/ISGRI data set using OSA V3.0. The source is clearly detected in 100 ks mosaicked images during Rev number 48, 57, 62 and 70. The revised ISGRI position has an estimated 90 % uncertainty of 2 arcmin and lies only 0.4 arcminutes from the JEM-X2 position.

The weighted mean position given by both instruments is then : R.A. = 19h14m02s, Decl. = 09o53.3' (equinox 2000.0; uncertainty at 90 % : 1.3 arcmin). The new INTEGRAL position puts IGR J19140+0951 5.3 arcmin away from the position of the EXOSAT source EXO 1912+097. However we cannot rule out IGR J19140+0951 and EXO 1912+097 to be the same object.