INTEGRAL/JEM-X observes the new outburst of the eclipsing 518 Hz AMXP SWIFT J1749.4-2807
ATel #14427; I. A. Mereminskiy (1), S. A. Grebenev (1), A. A. Lutovinov (1), R. A. Krivonos (1) and E. Kuulkers (2) on behalf of the Galactic bulge monitoring team (1: Space Research Institute, Moscow, Russia; 2: ESA/ESTEC, Noordwijk, Netherlands)
on 1 Mar 2021; 14:05 UT
Credential Certification: Ilya Mereminskiy (i.a.mereminskiy@gmail.com)
Subjects: X-ray, Transient, Pulsar
Referred to by ATel #: 14428
In the regular Galactic bulge monitoring observations, performed over 28 Feb. - 01 Mar. INTEGRAL/JEM-X detected the onset of a new outburst from the peculiar AMXP SWIFT J1749.4-2807, renowned for the presence of X-ray eclipses. SWIFT J1749.4-2807 remained in quiescence since the 2010 outburst.
The source is detected in an averaged mosaic at 12±2 mCrab (about 2.2x10-10 ergs cm-2 s-1) flux in 3-12 keV band. Using previously obtained data during 25-26 Feb, we place an upper limit on source flux of 5 mCrab (90% confidence).
The source is not detected in hard X-rays (30-60 keV) in simultaneous IBIS/ISGRI observations.
Also, JEM-X observed a bright type-I X-ray burst from the source at approximately 23:44UTC on Feb.28. The burst lasted for about 16 seconds, with averaged flux of 0.5±0.1 Crab in 3-12 keV band, reminiscent of the previously observed bursts (ATel #2561, GCN#5208).
Multiwavelength observations are encouraged in order to study the source, especially in the IR/NIR bands.
