INTEGRAL detects an X-ray burst from SAX J1747.0-2853 with no detectable persistent emission

Jérôme Chenevez, Søren Kristian Brandt, Erik Kuulkers, V. Beckmann, T. Bird, A. Domingo, K. Ebisawa, P. Jonker, P. Kretschmar, C. Markwardt, T. Oosterbroek, A. Paizis, D. Risquez, C. Sanchez-Fernandez, S. Shaw, R. Vijnands

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A new season of observations for the INTEGRAL Galactic Bulge monitoring (see ATel #438) has started on 2009 Feb. 21st. During the latest observation between 2009 Feb 25 13:21 and 17:02 (UT) a type I X-ray burst from SAX J1747.0-2853 (1A 1743-288, aka GX .2-0.2) was detected by JEM-X at UT 14:50:51 (MJD=54887.61865). The burst profile showed clear evidence of a photospheric radius expansion event and the peak flux reached 1.6 Crab (4.2x10-8 erg/cm2/s) in the 3-25 keV range. The total duration of the event was about 20 s, which is quite typical for the X-ray bursts from this source (see, e.g., ATELS #256, #642, and #734). No persistent emission from the source was otherwise detected by JEM-X with upper limits of 5 mCrab (8x10-11 erg/cm2/s) and 2 mCrab (2x10-11 erg/cm2/s) in the 3-10 kev and 10-25 keV energy bands, respectively. The upper limit for ISGRI (10-40 keV) is about 10 mCrab. This burst could be the first indication of renewed activity from this recurrent neutron star transient. A new outburst, if it is confirmed, would indeed be consistent with previous observations showing a periodicity of about 185 days (see Atel #1228), and expected to reach a maximum around the end of April 2009. We will observe the source again on 2009 March 03 as part of the INTEGRAL Galactic Bulge monitoring program. Follow-up observations are encouraged.
Original languageEnglish
JournalThe Astronomer's telegram
Pages (from-to)1944
Publication statusPublished - 2009

Cite this

Chenevez, J., Brandt, S. K., Kuulkers, E., Beckmann, V., Bird, T., Domingo, A., Ebisawa, K., Jonker, P., Kretschmar, P., Markwardt, C., Oosterbroek, T., Paizis, A., Risquez, D., Sanchez-Fernandez, C., Shaw, S., & Vijnands, R. (2009). INTEGRAL detects an X-ray burst from SAX J1747.0-2853 with no detectable persistent emission. The Astronomer's telegram, 1944.