INTEGRAL/JEM-X detection of a possible new outburst from GRS 1747-312

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

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During the observations performed during INTEGRAL monitoring of the Galactic Bulge region (see ATel #438) on 2013 March 11, we detected enhanced emission from the direction of the globular cluster Terzan 6 using the INTEGRAL/JEM-X instrument. This likely indicates that the bursting low-mass X-ray binary GRS 1747-312 is active again (as also reported by the MAXI transient alert on 2013-03-11 12:45:25 UT), although it cannot be fully excluded that another X-ray binary has become active in this cluster.
The source is detected in the combined JEM-X mosaic at 25 sigma (effective exposure time 12.5 ksec) with average fluxes of 41+/-3 mCrab in the 3-10 keV energy band and 23+/-4 mCrab in the 10-25 keV energy band. The JEM-X spectrum is well fit by using a black-body model with a temperature of 1.7+/-0.2 keV and an absorption column density fixed to the Galactic value in the direction to the cluster, i.e. 6E21 cm^(-2). This gives a 3-10 keV flux of 6.0x10^(-10) ergs/cm^2/s.
No type-I X-ray bursts are visible in the JEM-X light-curve.

The source is not detected by IBIS/ISGRI. We estimated an upper limit on the source flux in the 20-40 keV energy band of 8 mCrab at 3 sigma confidence level (effective exposure time 11 ksec).

The next INTEGRAL observations in the direction of the source are planned for 20 March 2013.
Original languageEnglish
Publication date13 Mar 2013
Publication statusPublished - 13 Mar 2013
SeriesThe Astronomer's telegram
NumberATel #4883


  • X-ray
  • Binary
  • Globular cluster
  • Neutron star
  • Transient

Cite this

Chenevez, J., Bozzo, E., Bordas, P., Kuulkers, E., Alfonso-Garzon, J., Beckmann, V., Bird, T., Brandt, S., Del Santo, M., Domingo, A., Ebisawa, E., Jonker, P., Kretschmar, P., Markwardt, C., Oosterbroek, T., Paizis, A., Pottschmidt, K., Sanchez-Fernandez, C., & Wijnands, R. (2013, Mar 13). INTEGRAL/JEM-X detection of a possible new outburst from GRS 1747-312. The Astronomer's telegram, No. ATel #4883