M. Del Santo
- INTEGRAL/JEM-X detects a new outburst of the Rapid Burster (MXB 1730-335)
- The astronomer's telegram
- Document type
- Faculty of Science (FNWI)
- Anton Pannekoek Institute for Astronomy (API)
The neutron star X-ray transient MXB 1730-335, aka the Rapid Burster, has been detected in outburst by the JEM-X monitors onboard INTEGRAL during the Galactic Bulge monitoring (see ATel #438) observation performed on February 28th, 2013, between (UT) 14:28 and 18:10. It is detected at 25 σ in the combined JEM-X mosaic with an effective exposure time of 2 ksec, and the measured fluxes are the following:
170 ±6 mCrab (2.9e-9 erg/cm2/s) in the 3-10 keV energy band,
122 ±13 mCrab (1.5e-9 erg/cm2/s) in the 10-25 keV energy band.
The source is not visible in the IBIS/ISGRI camera with flux upper limits (6 σ) of ~3 mCrab (2.9e-11 erg/cm2/s) in the 18-40 keV band, and ~10 mCrab (1.0e-10 erg/cm2/s) in the 40-100 keV band.
No bursting activity is noticeable.
During the previous observation of the Galactic Bulge on February 24th (see ATel #4840) the source was not detected with 5 σ upper limits of 8 mCrab (1.1e-10 erg/cm2/s) and 5 mCrab (5e-11 erg/cm2/s) in the 3-10 keV and 10-25 keV bands, respectively.