THE DISCOVERY AND OBSERVATIONS OF THE HARD X-RAY TRANSIENT SOURCE GRS-1009-45 BY THE WATCH INSTRUMENT OF THE GRANAT OBSERVATORY

Authors
LAPSHOV IY SAZONOV SY SYUNYAEV RA BRANDT S CASTROTIRADO A LUND N
Citation
Iy. Lapshov et al., THE DISCOVERY AND OBSERVATIONS OF THE HARD X-RAY TRANSIENT SOURCE GRS-1009-45 BY THE WATCH INSTRUMENT OF THE GRANAT OBSERVATORY, Astronomy letters, 20(2), 1994, pp. 205-206
Citations number
5
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Astronomy letters → ACNP
ISSN journal
10637737
Volume
20
Issue
2
Year of publication
1994
Pages
205 - 206
Database
ISI
SICI code
1063-7737(1994)20:2<205:TDAOOT>2.0.ZU;2-D
Abstract
The history of the discovery and localization of the transient X-ray s ource GRS 1009-45, with the WATCH instrument of the GRANAT observatory in September 1993, is presented. At its peak, the source reached 0.8 of the Crab nebula brightness in the 8-60 keV energy band. This X-ray source distinguishes itself with the high spectral hardness that is co mparable to the spectral hardness of the Crab nebula. In this paper we present light curves of GRS 1009-45 in two energy bands from Septembe r through October of 1993.