The new X-ray outburst of GRO J1744-28 detected with INTEGRAL
ATel #10073; I. A. Mereminskiy, S. A. Grebenev, R. A. Krivonos (Space Research Institute, Moscow)
on 13 Feb 2017; 15:54 UT
Credential Certification: Sergei Grebenev (firstname.lastname@example.org)
Subjects: X-ray, Gamma Ray, Neutron Star, Transient, Pulsar
During INTEGRAL monitoring of the Galactic bulge (Kuulkers et al. ATel #438) on Feb. 13, 2017, we revealed the onset of a new X-ray outburst of the mysterious Bursting Pulsar GRO J1744-28. According to INTEGRAL/JEM-X the 3-20 keV flux from this source was found to be at the level of 22 mCrab. On Feb. 8-10, during the previous JEM-X observations, it was below 6 mCrab (3-sigma upper limit). No type-II bursts have been detected yet.
This is the fourth known X-ray outburst of this source. The previous ones occurred in 1995, 1996 and 2014 (IAUC # 6272 ; Woods et al. ApJ, 517, 431, 1999; ATels #5790, #5963, #5997). During the outburst in 1996 its 8-20 keV flux reached ~3.7 Crab according to WATCH/GRANAT (Sazonov et al. AstL, 23, 326, 1997).
Observations in all wavelengths are encouraged.