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ATEL # 2695; S.A. Grebenev, A.A. Lutovinov (IKI, Moscow)
on 24 Jun 2010; 16:27 UT
Distributed as an Instant Email Notice (Request for Observations)
Password Certification: S.A.Grebenev (firstname.lastname@example.org)
Subjects: Infra-Red, Optical, X-ray, Request for Observations, Black Holes, Neutron Stars, Transients
Referred to by ATEL #: 2696, 2704
We report the discovery with the IBIS/ISGRI telescope aboard INTEGRAL of a previously unknown hard transient X-ray source IGR J05414-6858. It was detected at the mosaic image accumulated during long observations of the SN1987A field on May 13-22 (~130 ks) and June 6-14 (~400 ks), 2010. The signal-to-noise ratio for the source was 8.8 in the 20-40 keV band. The average flux was equal to 3.5+/-0.4 mCrab that corresponds to the luminosity of 8x10^36 erg/s at the LMC distance of 50 kpc. According to the INTEGRAL observations of the region in 2003-2004 the 3-sigma upper limit for the source flux was ~0.5 mCrab.
The source best-fit position was R.A.=05h41m26s, Decl.=-68d58m23s (equinox 2000.0, uncertainty 2.5'). It is 20' and 37' off the PSR B0540-693 and SN1987A positions, and 6.5' off the position of the nearest known X-ray source CAL 80 (the soft source discovered by EINSTEIN but not detected by ROSAT). Note that IGR J05414-6858 is located in the outskirts of the 30 Doradus nebula, the most active star-forming region in the Local Group.
We encourage follow-up observations of this source at all wavelengths.