A very intense X-ray outburst of Vela X-1 detected with INTEGRAL

Details A very intense X-ray outburst of Vela X-1 detected with INTEGRAL A very intense X-ray outburst of Vela X-1 detected with INTEGRAL

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003atel..211....1k&link_type=abstract

The Astronomer's Telegram, #211

Astronomy and Astrophysics

Astronomy

15

Radio, Far-Infra-Red, Infra-Red, Optical, X-Ray, Gamma Ray, Request For Observations, Binaries, Neutron Stars, Pulsars

Scientific paper

We report a very intense hard X-ray outburst detected from Vela X-1 with INTEGRAL/IBIS in the course of deep Core Program observations of the Vela region. The outburst began on November 28, 2003 at 02:32:52 UT and lasted 15.2 ksec. The S/N ratio measured from the source at the image reached ~270 standard deviations. From a preliminary analysis the photon flux in the 15-40 keV band of ISGRI was seen to raise by an order of magnitude from less then 500 mCrab to about 7 Crab during the first 5400 s (three pointings).

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