X-ray and Optical Activity in V4641 Sgr (=SAX 1819.3-2525)

Details X-ray and Optical Activity in V4641 Sgr (=SAX 1819.3-2525) X-ray and Optical Activity in V4641 Sgr (=SAX 1819.3-2525)

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003atel..171....1b&link_type=abstract

The Astronomer's Telegram, #171

Astronomy and Astrophysics

Astronomy

3

Infra-Red, Optical, X-Ray, Black Holes, Transients

Scientific paper

V4641 Sgr is now active in X-rays, and activity continues in optical/IR bands. A ~1 kilosecond dwell with the RXTE/PCA taken August 5 2003 starting at UT 01:18 shows flux varying from 20 to 35 mCrabs. On August 6 between UT 08:43 - 09:31 the source was in a highly active flaring state, with flares of up to 100 mCrabs erupting on timescale of 10-30 seconds. Observations on August 6 from UT 10:23 - 11:13 did not show large flares, but rather a state similar to that observed in the August 5 dwell.

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