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ATEL # 2505; J. Chenevez, S. Brandt (DTU Space, Denmark), E. Kuulkers (ESA/ESAC, Spain), J. Alfonso-Garzón (LAEX-CAB/INTA-CSIC, Spain), V. Beckmann (APC, France), T. Bird (Southampton, UK), Th. Courvoisier (ISDC, Switzerland), A. Domingo (LAEFF/INTA, Spain), K. Ebisawa (ISAS, Japan), P. Jonker (SRON, The Netherlands), P. Kretschmar (ESA/ESAC, Spain), C. Markwardt (GSFC, USA), T.Oosterbroek (ESA/ESTEC, The Netherlands), A. Paizis (INAF-IASF, Italy), C. Sanchez-Fernandez (ESA/ESAC, Spain), R. Wijnands (UvA, The Netherlands)
on 24 Mar 2010; 17:41 UT
Distributed as an Instant Email Notice (Request for Observations)
Password Certification: Jerome CHENEVEZ (firstname.lastname@example.org)
Subjects: X-ray, Request for Observations, Neutron Stars, Transients
Referred to by ATEL #: 2526, 2540
On March 24, 2010 at 01h33m08s (UTC) during an INTEGRAL monitoring observation of the Galactic bulge (see ATel #438), the X-ray monitor JEM-X detected an X-ray burst from the burst-only source SAX J1753.5-2349 (in 't Zand et al. 1998, arXiv:astro-ph/9802304). This event lasted about 20 s, and reached a peak flux of 2.9 +/- 0.8 Crab (3-25 keV) after a relatively long rise time of 9 s.
No persistent emission around the burst is detected above 5 mCrab (8.e-11 erg/cm2/s) and 2 mCrab (2.e-11 erg/cm2/s) between 3-10 keV and 10-25 keV, respectively.
Moreover, we note that the RXTE/PCA Galactic bulge scans register an outburst from the source which started around March 16 and increasing to about 13 mCrab between 2-60 keV on March 21 (see http://lheawww.gsfc.nasa.gov/users/craigm/galscan/html/SAXJ1753.5-2349.html).
The last observed outburst from SAX J1753.5-2349 was recorded in October 2008 (see ATels #1799, #1809, #1810, #1814) and the source was reported in quiescence again in March 2009 (ATel #1975).
The Galactic bulge will be observed again by INTEGRAL on March 26.
Follow-up observations at all wavelengths are encouraged.