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IGR J11215-5952 discovered in INTEGRAL Galactic Plane Scans

ATel #469; P. Lubinski (CAMK, Warsaw & ISDC), M. Gadolle Bel (CEA, Saclay), A. von Kienlin (MPE, Munich ), C. Budtz-Jorgensen (DSRI, Copenhagen), B. McBreen (Univ. College Dublin), P. Kretschmar (ESA/ESAC, Spain), W. Hermsen (SRON-Utrecht), P. Shtykovsky(SRI, Moscow)
on 22 Apr 2005; 17:27 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: Nami Mowlavi (Nami.Mowlavi@obs.unige.ch)

Subjects: X-ray, Gamma Ray, Request for Observations, Transient

Referred to by ATel #: 470, 766, 768, 3200

We report the discovery of a new source of hard X-rays by the IBIS/ISGRI detector on board INTEGRAL. The new source, IGR J11215-5952, was detected in the 20--60 keV band in two consecutive core programme observations of Galactic Plane Survey, each of ~ 2100 second duration. The approximate 20--60 keV count-rate and mCrab equivalents, for pointings starting at the given times, are as follows:

  
 Obs. Start Time (UTC)     cps     mCrab 


======================= === =====
2005 April 22 06:02:25: 12 75
2005 April 22 06:43:01: 7 44

The position of the source is: RA=11h21m45s, DEC=-59d52' with 3' accuracy. The new source is located about 45' from Cen X-3.

During this Galactic Plane scan, the only pointings of the new source region are the two given above and the source region is not scheduled to be observed with INTEGRAL until 15th May.

The source was not detected in the 60-200 keV ISGRI images, suggesting a soft spectrum. This could not be confirmed by JEM-X, which did not detect the new source in the 3--10 keV or 10--30 keV bands. However, it should be noted that the source position was only in the field of view of JEM-X in one pointing (starting at 06:43:01), when it was located approximately 3.5 degrees from the pointing direction, where systematic effects start to limit the sensitivity of the JEM-X instrument.

Follow-up observations are encouraged.