OBSERVATION OF GX-339-4 HARD STATE OUTBURSTS IN 1991 AND 1992

Authors
HARMON BA WILSON CA PACIESAS WS PENDLETON GN BRIGGS MS RUBIN BC FINGER MH FISHMAN GJ BROCK MN WILSON RB MEEGAN CA
Citation
Ba. Harmon et al., OBSERVATION OF GX-339-4 HARD STATE OUTBURSTS IN 1991 AND 1992, The Astrophysical journal, 425(1), 1994, pp. 120000017-120000020
Citations number
28
Categorie Soggetti
Astronomy & Astrophysics
Journal title
The Astrophysical journal → ACNP
ISSN journal
0004637X
Volume
425
Issue
1
Year of publication
1994
Part
2
Pages
120000017 - 120000020
Database
ISI
SICI code
0004-637X(1994)425:1<120000017:OOGHSO>2.0.ZU;2-A
Abstract
Two hard state (X-ray low state) outbursts in the GX 339-4 system in 1 991 June-October and 1992 September-1993 January were detected and mon itored by the Burst and Transient Source Experiment (BATSE) on the Com pton Gamma Ray Observatory (CGRO). The outbursts were remarkably simil ar in both temporal and spectral aspects. The spectrum in the 20-300 k eV band evolves from a hard, Comptonized shape to a steeper (alpha alm ost-equal-to -3) power law during each outburst.