Other
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..410..952b&link_type=abstract
The fourth compton symposium. AIP Conference Proceedings, Volume 410, pp. 952-956 (1997).
Other
1
X-Ray Sources, X-Ray Bursts, Black Holes, X-Ray
Scientific paper
Analyzing data from the BATSE instrument on the Compton Gamma Ray Observatory, we have found evidence of two hard X-ray outbursts from the ultra-soft transient and black hole candidate 4U 1630-47. Both outbursts are nearly simultaneous with observations at lower energies by other instruments. In July 1994, the source reached a hard X-ray (20-100 keV) flux of ~100 mCrab, with a possible brief flare of ~200 mCrab. BATSE occultation images confirm that this emission originated from 4U 1630-47. This outburst corresponds to an archival detection of the source by ASCA, as reported by Parmar et al. [9]. In June 1996, during the extended outburst observed by RXTE [6], the 20-100 keV flux also reached ~100 mCrab. The origin of this emission was verified by BATSE images as well. Kuulkers et al. [5] present RXTE/ASM data from the same period of time. We compare the BATSE data with the ASCA and RXTE/ASM results in order to push our knowledge of this source's spectral characteristics into the hard X-ray range.
Barret Dider
Bloser Peter F.
Fishman Gerald J.
Grindlay Jonathon E.
Harmon Alan B.
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