INTEGRAL finds renewed X-ray activity of the Neutron star X-ray transient SAX J1750.8-2900

Celia Sanchez-Fernandez*, Jérôme Chenevez, Erik Kuulkers, Angela Bazzano, Volker Beckmann, Tony Bird, Arash Bodaghee, Melania Del Santo, Albert Domingo, Peter Jonker, Peter Kretschmar, Craig Markwardt, Ada Paizis, Katja Pottschmidt, Rudy Wijnands

*Corresponding author for this work

Research output: Other contributionNet publication - Internet publicationResearch

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INTEGRAL Galactic bulge monitoring observations (ATel #438) on UT 13 September 2015 18:50-22:32 reveal renewed X-ray activity from the low-mass X-ray binary transient and Type I X-ray burster SAX J1750.8-2900 (IAU Circ. #6597). The last outburst from this source was reported in 2011 (ATels #3170, 3181). The JEM-X 3-10 keV and 10-25 keV fluxes during our observations are 32+/-3 mCrab and 16+/-6 mCrab respectively. A Type I X-ray burst from SAX J1750.8-2900 was detected during these observations, on UT 13 September 2015 20:51, with a peak flux of 2.3+/-0.2 Crab (3-25 keV) and a duration of 17 seconds. The source is not detected with IBIS/ISGRI on September 13 with 3-sigma upper limits of about 5 and 8 mCrab in the 18-40 keV and 40-100 keV bands, respectively (12.6 ksec exposure). Similar observations about 5 days earlier (on UT 8 September 2015 13:52-17:34; 12.6 ksec exposure) did not reveal the source with 3-sigma upper limits of 7 (3-10 keV) and 15 mCrab (10-25 keV). We encourage further observations of SAX J1750.8-2900 at X-rays and other wavelengths.
Original languageEnglish
Publication date15 Sep 2015
Publication statusPublished - 15 Sep 2015
SeriesThe Astronomer's telegram
NumberATel #8058


  • X-ray
  • Binary
  • Neutron Star
  • Transient


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