Volume 647, March 2021
|Number of page(s)||6|
|Published online||29 March 2021|
SGR 0755−2933: a new high-mass X-ray binary with the wrong name
Institut für Astronomie und Astrophysik, Sand 1, 72076 Tübingen, Germany
2 Space Research Institute of the Russian Academy of Sciences, Profsoyuznaya Str. 84/32, Moscow 117997, Russia
3 Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
Accepted: 26 January 2021
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.
Key words: binaries: general / pulsars: individual: SGR 0755−2933 / stars: neutron
© ESO 2021
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