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Astron. Astrophys. 346, L45-L48 (1999)


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Letter to the Editor

Discovery of type-I X-ray bursts from GRS 1741.9-2853

M. Cocchi 1, A. Bazzano 1, L. Natalucci 1, P. Ubertini 1, J. Heise 2, J.M. Muller 2,3 and J.J.M in 't Zand 2

1 Istituto di Astrofisica Spaziale (IAS/CNR ), via Fosso del Cavaliere 100, I-00133 Roma, Italy
2 Space Research Organization Netherlands (SRON) , Sorbonnelaan 2, 3584 TA Utrecht, The Netherlands
3 BeppoSAX Science Data Centre, Nuova Telespazio, via Corcolle 19, I-00131 Roma, Italy

Received 8 April 1999 / Accepted 10 May 1999

Abstract

For the first time X-ray bursts have been detected from a sky position consistent with the one of GRS 1741.9-2853, a GRANAT transient source located only [FORMULA] from the Galactic Centre. A total of 3 bursts have been observed by the Wide Field Cameras telescopes on board BeppoSAX during a monitoring observation of the Sgr A region in August-September 1996. The characteristics of the events are consistent with type-I bursts, thus identifying the source as a likely low-mass X-ray binary containing a neutron star. Evidence of photospheric radius expansion due to super-Eddington luminosity is present in one of the observed bursts, thus leading to an estimate of the source distance ([FORMULA] kpc).

Key words: stars: binaries: general – stars: novae, cataclysmic variables – stars: individual: GRS 1741.9-2853 – X-rays: bursts – X-rays: stars

Send offprint requests to: M. Cocchi (wood@ias.rm.cnr.it)

© European Southern Observatory (ESO) 1999

Online publication: June 17, 1999

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