SGR 0755−2933: a new high-mass X-ray binary with the wrong name
Abstract
The soft gamma-ray repeater candidate SGR 0755−2933 was discovered in 2016 by Swift/BAT, which detected a short (∼30 ms), powerful burst typical of magnetars. To understand the nature of the source, we present here an analysis of follow-up observations of the tentative soft-X-ray counterpart of the source obtained with Swift/XRT, NuSTAR, and Chandra. From our analysis we conclude that, based on the observed counterpart position and properties, SGR 0755−2933 is not a soft gamma-ray repeater but rather a new high-mass X-ray binary. We suggest it be referred to as 2SXPS J075542.5−293353. We therefore conclude that the available data do not allow us to confirm existence and identify the true soft-X-ray counterpart to the burst event. The presence of a soft counterpart is nevertheless essential to unambiguously associate the burst with a magnetar flare, and we conclude that the magnetar origin of the burst and a precise burst location remain uncertain and require further investigation.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- March 2021
- DOI:
- 10.1051/0004-6361/202039785
- arXiv:
- arXiv:2101.10834
- Bibcode:
- 2021A&A...647A.165D
- Keywords:
-
- binaries: general;
- pulsars: individual: SGR 0755−2933;
- stars: neutron;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 6 pages, 6 figures, accepted in A&