The May 1989 outburst of the Soft X-ray Transient GS 2023+338 (V404 Cyg)

(2) University of Leicester; 3); (3) CAMK); C. Done (1); D. Smith (2) ((1) University of Durham; P. Zycki (1

The May 1989 outburst of the Soft X-ray Transient GS 2023+338 (V404 Cyg)

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arxiv astro-ph/9904304 v1 pith:HJWIMEVR submitted 1999-04-22 astro-ph

P. Zycki (1 , 3) , C. Done (1) , D. Smith (2) ((1) University of Durham , (2) University of Leicester , (3) CAMK) This is my paper · ORCID

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We re-analyze archival Ginga data of the soft X-ray transient source GS 2023+338 covering the beginning of its May 1989 outburst. The source showed a number of rather unusual features: very high and apparently saturated luminosity, dramatic flux and spectral variability (often on ~1 sec time scale), generally very hard spectrum, with no obvious soft thermal component characteristic for soft/high state. We describe the spectrum obtained at the maximum of flux and we demonstrate that it is very different from spectra of other soft X-ray transients at similar luminosity. We confirm previous suggestions that the dramatic variability was due to heavy and strongly variable photo-electric absorption. We also demonstrate that for a short time the source's spectrum did look like a typical soft/high state spectrum but that this coincided with very heavy absorption.

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