SIGMA hard X-ray observations of the burst source MXB 1728-34

Details SIGMA hard X-ray observations of the burst source MXB 1728-34 SIGMA hard X-ray observations of the burst source MXB 1728-34

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...423..436c&link_type=abstract

The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 423, no. 1, p. 436-440

Astronomy and Astrophysics

Astrophysics

33

Gamma Ray Bursts, Stellar Flares, Stellar Models, X Ray Binaries, Bremsstrahlung, Energy Spectra, Stellar Luminosity, X Ray Spectra

Scientific paper

We report the first detection by the SIGMA telescope of hard X-ray emission from the burst source 4U/MXB 1728-34 (also called GX 354-0). This source has been monitored during the 1992 February - April survey of the Galactic center region for a total of approximately 240 useful hr. It underwent two high-energy flares of about 10 days duration each. However, the MXB 1728-34 spectrum does not vary significantly as a function of the source intensity. The average spectrum is well described by a thermal bremsstrahlung model with a temperature of approximately 38 keV and a flux of approximately 7 x 10-10 ergs/sq cm/s in the 30-200 keV band. The high-quality data of these observations provide the best known hard X-ray spectrum of a bursting low-mass X-ray binary.

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