A hard X-ray transient in the direction of Terzan 5 detected by INTEGRAL

Details A hard X-ray transient in the direction of Terzan 5 detected by INTEGRAL A hard X-ray transient in the direction of Terzan 5 detected by INTEGRAL

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atel.2919....1b&link_type=abstract

The Astronomer's Telegram, #2919

Astronomy and Astrophysics

Astronomy

21

X-Ray, Gamma-Ray, Transient, Neutron Star, Pulsar, Gamma Ray, Neutron Star

Scientific paper

During the Galactic bulge monitoring program, performed between 2010 October 10 08:45 and 2010 October 10 12:27, the IBIS/ISGRI instrument onboard INTEGRAL discovered an outburst from a hard X-ray source. The best determined position is at RA=267.01 DEC=-24.78 (J2000, associated error 1.3 arcmin, 90% c.l.), towards the globular cluster Terzan 5. We tentatively identify the source with the neutron star X-ray transient EXO 1745-248 = XB 1745-25, which is located within the INTEGRAL error box (RA=17:48:05.196 ± 0.015 DEC=-24:46:47.40 ± 0.20, Heinke et al, 2003, ApJ, 590, 809)
The source is detected in the IBIS/ISGRI mosaic at a significance of 20 sigma in the 20-40 keV energy band, and 11 sigma in the 40-100 keV energy band (effective exposure time 8.4 ks).

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