Strong radio flare in V4641 Sgr (= SAX J1819.3-2525)

Astronomy and Astrophysics – Astronomy

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

Scientific paper

We report a strong radio flare from the X-ray transient and likely black hole binary V4641 Sgr, which has recently become active again in the optical (ATEL #170) and X-ray (ATEL #171) bands. Observations with the Very Large Array (VLA) on August 6, 2003 gave strong detections at both 4.86 and 8.46 GHz, compared with a non-detection at 4.86 GHz on July 31, 2003 with an rms noise level of 0.1 mJy/beam.

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