GX 339-4: Continued Optical and Infra-red Decline

Details GX 339-4: Continued Optical and Infra-red Decline GX 339-4: Continued Optical and Infra-red Decline

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004atel..323....1b&link_type=abstract

The Astronomer's Telegram, #323

Astronomy and Astrophysics

Astronomy

2

Infra-Red, Optical, Binaries, Black Holes, Transients

Scientific paper

Ongoing observations of GX 339-4 by the SMARTS consortium 1.3m telescope and ANDICAM instrument at CTIO show a continuing sharp decline in optical and near-IR flux levels throughout the X-ray state transition described by Smith et al. (ATEL #322). Data taken starting August 20 UT=2:36 shows V=16.8, I=15.1, J=14.9, H=14.6. This constitutes a decline of 0.8, 1.0, 1.4 and 1.9 magnitudes respectively in V, I, J and H since July 31.

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