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SGR 0755-2933: A new high-mass X-ray binary with the wrong name




TekijätDoroshenko Victor, Santangelo Andrea, Tsygankov Sergey S., Ji Long

KustantajaEDP Sciences

Julkaisuvuosi2021

JournalAstronomy and Astrophysics

Tietokannassa oleva lehden nimiAstronomy and Astrophysics

Artikkelin numeroA165

Vuosikerta647

eISSN1432-0746

DOIhttps://doi.org/10.1051/0004-6361/202039785

Verkko-osoitehttps://doi.org/10.1051/0004-6361/202039785

Rinnakkaistallenteen osoitehttps://research.utu.fi/converis/portal/detail/Publication/54786886


Tiivistelmä

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. 


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