BATSE observations of two X-ray bursters: 4U 1820-30 and 4U 1915-05.

Details BATSE observations of two X-ray bursters: 4U 1820-30 and 4U 1915-05. BATSE observations of two X-ray bursters: 4U 1820-30 and 4U 1915-05.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..120c.275b&link_type=abstract

Astronomy and Astrophysics Supplement, v.120, p.275-278

Astronomy and Astrophysics

Astrophysics

8

Stars: Individual: 4U 1820-30, 4U 1915-05, X-Rays: Stars, Gamma-Rays: Observations

Scientific paper

Using the BATSE instrument on the Compton Gamma Ray Observatory, the X-ray bursters 4U 1820-30 and 4U 1915-05 have been monitored in the hard X-ray band. In four years of data neither source was detected. We derive 2σ upper limits on 20-100keV flux from 4U 1915-05 of 2.6x10^-2^photons/cm^2^/s (90mCrab) for 1-day integrations and 9.0x10^-3^photons/cm^2^/s (30mCrab) for 10-day integrations. For 4U 1820-30 the upper limits are 2.4x10^-2^photons/cm^2^/s (80mCrab) for 1-day integrations and 1.0x10^-2^photons/cm^2^/s (30mCrab) for 10-day integrations. These limits are not strong enough to constrain spectral models for the sources. The implications of these observations are discussed in light of BATSE results on other bursters.

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