TY - ICOMM
T1 - INTEGRAL detects a rebrightening of the accreting millisecond X-ray pulsar IGR J17591-2342
AU - Sanchez-Fernandez, C.
AU - Ferrigno, C.
AU - Chenevez, J.
AU - Kuulkers, E.
AU - Wijnands, R.
AU - Bazzano, A.
AU - Jonker, P.
AU - Santo, M. Del
PY - 2018/9/1
Y1 - 2018/9/1
N2 - IGR J17591-2342 was discovered by INTEGRAL on August 11, 2018 (ATel #11941). The outburst had actually started on July 22, 2018 (ATel #11981)
and reached its peak on July 25, with a flux of ~50mCrab in the
Swift/BAT energy range (15-150 keV). Since then, the outburst smoothly
decayed to lower flux values, being detected at a flux of 3 mCrab by
NICER (2-10 keV) on August 15th (ATel #11957).
During observations of the Galactic Bulge region between August 30,
21:10 and August 31, 00:52 (UT), a significant rebrightening of the
source has been detected by IBIS/ISGRI. The flux estimated from the
mosaic image is ~33 mCrab in the 20-40 keV energy range. The source is
barely at the edge of the JEMX field of view. We derive 3-sigma upper
limits of ~20 mCrab (3-10 keV) and ~40 mCrab (10-25 keV) in the JEM-X
mosaics.
The IBIS/ISGRI spectrum can be fit with a powerlaw model with spectral
index 2, showing no significant spectral variations when compared to the
IBIS/ISGRI spectrum of the system measured on August 11.
INTEGRAL will be observing the region around this source until September
4th. We encourage observations at other wavelengths.
AB - IGR J17591-2342 was discovered by INTEGRAL on August 11, 2018 (ATel #11941). The outburst had actually started on July 22, 2018 (ATel #11981)
and reached its peak on July 25, with a flux of ~50mCrab in the
Swift/BAT energy range (15-150 keV). Since then, the outburst smoothly
decayed to lower flux values, being detected at a flux of 3 mCrab by
NICER (2-10 keV) on August 15th (ATel #11957).
During observations of the Galactic Bulge region between August 30,
21:10 and August 31, 00:52 (UT), a significant rebrightening of the
source has been detected by IBIS/ISGRI. The flux estimated from the
mosaic image is ~33 mCrab in the 20-40 keV energy range. The source is
barely at the edge of the JEMX field of view. We derive 3-sigma upper
limits of ~20 mCrab (3-10 keV) and ~40 mCrab (10-25 keV) in the JEM-X
mosaics.
The IBIS/ISGRI spectrum can be fit with a powerlaw model with spectral
index 2, showing no significant spectral variations when compared to the
IBIS/ISGRI spectrum of the system measured on August 11.
INTEGRAL will be observing the region around this source until September
4th. We encourage observations at other wavelengths.
M3 - Net publication - Internet publication
T3 - The Astronomer's telegram
ER -