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INTEGRAL detection of the outburst of SAX J1750.8-2900

ATEL # 1434; L. Natalucci (INAF/IASF-Roma), V. Beckmann (ISDC), A. Bazzano, M. Fiocchi, A. Tarana, P. Ubertini, A. De Rosa, (INAF/IASF-Roma), R. Walter (ISDC), M. Cadolle-Bel (ESA/ESAC), M. Falanga, D. Gotz, A. Goldwurm (CEA), S. Mereghetti, L. Sidoli (INAF/IASF-Milano), J. Leyder (IAG/Universite de Liege), S. Piraino (IAAT), K. Pottschmidt (CRESST/GSFC/UMBC), and K. Watanabe (FGCU)
on 19 Mar 2008; 21:57 UT
Password Certification: Lorenzo Natalucci (

Subjects: X-ray, Gamma Ray, Binaries, Neutron Stars, Transients

The X-ray transient SAX J1750.8-2900 is detected during INTEGRAL Key Programme observations pointed at the Galactic Center starting 2008 March 12.93 UT and lasting 2.2 days. The source appears bright in the soft X-rays as seen by JEM-X1 since the start of the observation. The light curve shows variability and amplitude fluctuations, up to a maximum level of 600 mCrab in the 3-10 keV band.

A preliminary analysis of the IBIS/ISGRI data shows positive detection for a source at a position 0.2' away from the one previously reported by SWIFT/XRT (ATEL #1431), thus proving identification with SAX J1750.8-2900. The ISGRI total exposure is 172 ks. The source appears especially bright near the end of the observation: its intensity on March 15.00 UT is 5.00.5 counts/s (about 30 mCrab) in the 20-40 keV band.

Further coverage of the source outburst will be available during the undergoing Key Programme observations of the Galactic Center field.

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R. E. Rutledge , Editor
ATEL Mirror v1.0 Updates