INTEGRAL detects renewed activity from IGR J19294+1816
ATel #2983; E. Bozzo (ISDC, University of Geneva), J. Rodriguez (CEA, Saclay), J. Wilms (Dr. Karl Remeis-Observatory), C. Ferrigno (ISDC, University of Geneva), S. Mereghetti (IASF/INAF, Milano), J. Tomsick (SSL, Berkeley), D. Gotz, I. Caballero, L. Prat (CEA, Saclay), P. Ubertini, M. Fiocchi, A. Tarana (IASF/INAF Roma), D. Klochkov (IAAT), K. Watanabe (FGCU), V. Sguera (INAF/IASF, Bologna), G. Skinner (CRESST/GSFC/UMCP), I. Kreykenbohm (Dr. Karl Remeis-Observatory), R. Terrier (CNRS/APC).
on 29 Oct 2010; 17:08 UT
Distributed as an Instant Email Notice Transients
Credential Certification: E. Bozzo (email@example.com)
Subjects: Binary, Neutron Star, Transient
Referred to by ATel #: 2985
During the INTEGRAL observations of GRS1915+105, performed from
2010 October 28 at 18:25 to 2010 October 29 at
00:10 UTC (total exposure time ~20 ks), IBIS/ISGRI
detected a renewed activity from
the transient binary system IGR J19294+1816.
The nature of the source is still debated, and it is
classified as a possible Be binary system
or supergiant fast X-ray transient
(SFXT, Rodriguez et al. 2009, A&A, 508, 889).
During the latest INTEGRAL observations, the
source is detected in the IBIS/ISGRI mosaic
at a significance level of 30 sigma (20-40 keV). Its
spectrum is best fit with a blackbody model of kT=4.8+/-0.4 keV
(effective exposure time 13 ks). The estimated flux in the
20-40 keV energy band is (4.9+/-0.3)E-10 erg/cm^2/s
(uncertainties at 90% c.l.).
The source was outside the JEM-X FOV during the entire
Previous INTEGRAL observations in the direction
of IGR J19294+1816 were performed from
2010 October 22 at 23:04 to 2010 October
23 at 05:31, for a total exposure time of 20 ks.
In that occasion IGR J19294+1816 was not detected in the IBIS/ISGRI
FOV and we estimated a 3 sigma c.l. upper limit on the hard X-ray
flux from the source of 5.6 mCrab, corresponding to ~4.3E-11 erg/cm^2/s.
We encourage observations at other wavelengths to characterize the
nature of this interesting transient source.