Further INTEGRAL observations of the transient X-ray burster EXO 1745-248

J. Chenevez*, E. Kuulkers, J. Alfonso-Garzon, V. Beckmann, T. Bird, P. Bordas, S. Brandt, Th. Courvoisier, M. Del Santo, A. Domingo, K. Ebisawa, C. Ferrigno, P. Jonker, P. Kretschmar, C. Markwardt, T. Oosterbroek, A. Paizis, K. Pottschmidt, C. Sanchez-Fernandez, R. Wijnands

*Corresponding author for this work

Research output: Other contributionNet publication - Internet publicationResearch

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Abstract

INTEGRAL performed further observations as part of the Galactic Bulge monitoring program (see ATel #438) on 2010 October 11 between (UTC) 02:25 and 06:07. The X-ray source in outburst in the direction of the globular cluster Terzan 5, EXO 1745-248 (ATels #2919, #2920 and #2922), is detected with both JEM-X 1&2, and with IBIS/ISGRI. A re-analysis of the observations performed on 2010 October 10 from (UTC) 08:45 to 12:26 (ATel #2919), shows that the source was detected in the JEM-X monitor at a position (RA=267.023, DEC=-24.781, with a 90% confidence error of 1 arcmin) consistent with the known X-ray burster EXO 1745-248 (Heinke et al. 2003, ApJ, 590, 809). At that time the flux was 9 +/- 5 mCrab (3-10 keV) and 33 +/-9 mCrab (10-25 keV). The observations on October 11 shows that within a day the flux has increased to 34 +/- 7 mCrab (3-10 keV), 49 +/- 4 mCrab (10-25 keV), 52 +/- 2 mCrab (18-40 keV), and 49 +/- 5 mCrab (40-100 keV). We detected one type I X-ray burst, on 2010 October 11 06:27, which lasted for about 20 sec. This strengthens EXO 1745-248 to be in outburst, as it is a known (transient) X-ray burster.
Original languageEnglish
Publication date11 Oct 2010
Publication statusPublished - 11 Oct 2010
SeriesThe Astronomer's telegram
NumberATel #2924

Keywords

  • X-ray
  • Gamma Ray,
  • Binary
  • Globular Cluster
  • Neutron Star
  • Transient

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