INTEGRAL detection of renewed flaring activity from GRO J1008-571 in hard-X rays

ATel #14756; M. Fiocchi (INAF-IAPS Roma, Italy), V. A. Lepingwell (Univ. of Southampton, UK), J. Chenevez (DTU Space, Denmark), A. Bazzano (INAF-IAPS Roma, Italy), P. Charles (Univ. of Southampton, UK), E. Kuulkers (ESA/ESTEC, The Netherlands), A. Malizia, N. Masetti, M. Molina (INAF-OAS, Bologna, Italy), L. Natalucci, F. Panessa (INAF-IAPS Roma, Italy), V. Sguera (INAF-OAS, Bologna, Italy), P. Ubertini (INAF-IAPS Roma, Italy), on behalf of the INTEGRAL/GPS team.
on 6 Jul 2021; 14:14 UT
Credential Certification: mariateresa fiocchi (mariateresa.fiocchi@iaps.inaf.it)

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During recent observations of the Galactic Plane (PI A. Bazzano) the High Mass X-ray Binary GRO J1008-571 has entered into a new outburst.

INTEGRAL observations indicate that the hard X-ray flux is increasing. GRO J1-57008-53 was detected by IBIS/ISGRI at 21 sigma during revolution 2381 performed between 2021-06-26 05:04:08 UTC and 2021-06-27 05:47:50 UTC, for an effective exposure time of 10.4 ks. The 22-60 keV IBIS/ISGRI flux corresponds to (31.5+/-1.5) mCrab. INTEGRAL observed GRO J1008-571 also during revolution 2384 from 2021-07-04 01:05:45 UTC to 2021-07-05 04:54:35 UTC, for an effective exposure time of 9.1 ks. The source was detected again by IBIS/ISGRI at 96 sigma, with a ~5-fold flux increase to (153.5+/-1.6) mCrab in the energy range 22-60 keV.

The source was also detected in the combined JEM-X1 and JEM-X2 mosaic with an effective exposure time of 19 ks and 17.5 ks for revolutions 2381 and 2384, respectively. The measured fluxes are the following for revolution 2381 and 2384:

(34.4 +/-1.7) mCrab in the 3-10 keV energy band

(24.8 +/-5.4) mCrab in the 10-25 keV energy band

(129.2 +/-2.2) mCrab in the 3-10 keV energy band

(145.8 +/-6.2) mCrab in the 10-25 keV energy band

All the data have been analyzed using the Offline Software Analysis (OSA11). Results from the Galactic Plane Scanning are publicly available at: http://gps.iaps.inaf.it.