SGR 0755$-$2933: a new High Mass X-ray binary with the wrong name

Abstract

The soft gamma-ray repeater candidate SGR 0755$-$2933 was discovered in 2016 by Swift/BAT, which detected a short ($\sim$30 ms) powerful burst typical of magnetars. To understand the nature of the source, we present here an analysis of follow-up observations of the tentative soft X-ray counterpart of the source obtained with Swift/XRT, NuSTAR and Chandra. From our analysis we conclude that, based on the observed counterpart position and properties, it is actually not a soft gamma ray repeater but rather a new high mass X-ray binary. We suggest to refer to it as 2SXPS J075542.5$-$293353. We conclude, therefore, that the available data do not allow us to confirm existence and identify the true soft X-ray counterpart to the burst event. Presence of a soft counterpart is, however, essential to unambiguously associate the burst with a magnetar flare, and thus we conclude that magnetar origin of the burst and precise burst location remain uncertain and require further investigation.

arXiv comment6 pages, 6 figures, accepted in A&A

References in corpus (14)

• On the Absorption of X-rays in the Interstellar Medium
• Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
• Methods and results of an automatic analysis of a complete sample of Swift-XRT observations of GRBs
• Fermi Large Area Telescope Fourth Source Catalog
• Catalogue of high-mass X-ray binaries in the Galaxy ($4^{th}$ edition)
• On Timing and Spectral Characteristics of the X-ray Pulsar 4U 0115+63: Evolution of the Pulsation Period and the Cyclotron Line Energy
• A magnetar-like event from LS I +61 303 and its nature as a gamma-ray binary
• The hard X-ray emission of X Per
• Dramatic spectral transition of X-ray pulsar GX 304-1 in low luminous state
• Cyclotron emission, absorption, and the two faces of X-ray pulsar A 0535+262
• Spectrum formation in X-ray pulsars at very low mass accretion rate: Monte-Carlo approach
• Changes in the cyclotron line energy on short and long timescales in V 0332+53
• Population of the Galactic X-ray binaries and eRosita
• An observational argument against accretion in magnetars

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