X-ray and Optical Activity in V4641 Sgr (=SAX 1819.3-2525)
Abstract
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.
- Publication:
-
The Astronomer's Telegram
- Pub Date:
- August 2003
- Bibcode:
- 2003ATel..171....1B
- Keywords:
-
- Infra-Red;
- Optical;
- X-ray;
- Black Holes;
- Transients