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INTEGRAL detection of re-brightening from GRO J1008-57

From

National Institute for Astrophysics1

Astrophysics and Atmospheric Physics, National Space Institute, Technical University of Denmark2

National Space Institute, Technical University of Denmark3

European Space Astronomy Centre4

University of Southampton5

The transient Be HMXB GRO J1008-57, recently detected during a type I X-ray outburst (ATels #10418, #10466) with a predicted peak on MJD 57909.37 or 5 June 2017 (based on the times of maximum flux, epoch=54416.65 MJD and Porb=249.48 days; Kuhnel et al. 2013), is currently undergoing a peculiar enhanced X-ray activity starting on MJD 57922 (17 June 2017) as detected by MAXI/GSC (ATel #10529).

GRO J1008-57 was in the field of view of INTEGRAL during recent Galactic Plane Scan observations (GPS) regularly performed in the last week. The source was detected by IBIS/ISGRI at about 9 sigma level (22-60 keV, 5.8 ks of effective exposure time) during GPS observations in revolution 1828 starting on MJD 57920.8 (16 June 2017 at 19:12 UTC).

The measured average flux was 25.3 +/- 2.8 mCrab. The source was also in the JEM-X monitor field of view for 1.8 ks effective exposure, the measured average fluxes were 25 +/- 4 mCrab (3-10 keV) and 15 +/- 6 mCrab (10-25 keV). During the subsequent GPS observations (revolution 1829, starting on MJD 57922), the source was detected by IBIS/ISGRI at 11.8 sigma level (22-60 keV, 4.3 ks of effective exposure time) with an enhanced average flux of 33.1 +/- 2.8 mCrab.

The source was also in the JEM-X monitor field of view for 3.3 ks effective exposure, the measured average fluxes were 25 +/- 3 mCrab (3-10 keV) and 38.0 +/- 10.5 mCrab (10-25 keV). Finally, during the most recent GPS observations (revolution 1831, starting on MJD 57928.7 or 24 June at 16:48 UTC) the source was detected by IBIS/ISGRI at 15.6 sigma level (22-60 keV, 4.3 ks of effective exposure time) with a further enhanced average flux of 43.6+/-2.8 mCrab.

The source was also in the JEM-X monitor field of view for 3.4 ks effective exposure, the measured average fluxes were 30 +/- 3 mCrab (3-10 keV) and 52 +/- 12 mCrab (10-25 keV). GRO J1008-57 is clearly undergoing a peculiar re-brightening especially above 20 keV, confirming the enhanced X-ray activity detected by MAXI/GSC below 20 keV.

Language: English
Year: 2017
Types: Other
ORCIDs: Chenevez, J.

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