During the Galactic Plane Scanning performed by INTEGRAL on December
11th, 2015, the X-ray monitor JEM-X has detected enhanced activity from
the high mass X-ray binary (HMXB) 4U 1036-56, aka RX J1037.5-5647. The
position of the source was covered by the JEM-X field of view two times
between UTC 6:55 and 12:38. The source was only detected at 4σ between
3-10 keV for a total effective exposure of 2.7 ks in the combined
The averaged 3-10 keV flux was 5.2 +/- 1.5 mCrab, which, at the 5 kpc
source distance (Motch et al. 1997, A&A 323, 853), leads to a
luminosity of about 2.7×1035 erg/s. We derive a 5σ upper
limit of 2 mCrab between 10-25 keV. The source was not detected by
IBIS/ISGRI with an exposure of 4 ks leading to a 3σ upper limit of 6
mCrab in the band 22-60 keV.
The source was not detected at all the last time its position was observed by INTEGRAL on November 23rd, 2015.
4U 1036-56 is a Be X-ray pulsar (e.g. Torres et al. 2012, ApJ 761, 49),
whose last outburst was reported by Swift in February 2012 (Krimm et al.
|Volume||ATel #: 8425|
|Number of pages||1|
|Publication status||Published - 2015|
|Series||The Astronomer's telegram|
- Neutron Star