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Optical Outburst of V4641 (=SAX J1819.3-2525)

ATel #170; M. Buxton (Yale), D. Maitra (Yale), C. Bailyn (Yale), L. Jeanty (Yale), D. Gonzalez (CTIO)
on 4 Aug 2003; 22:31 UT
Credential Certification: Dipankar Maitra (maitra@astro.yale.edu)

Subjects: Optical, Binary, Black Hole, Transient

Referred to by ATel #: 172, 175

SMARTS consortium observations of the black hole candidate V4641 Sgr with the 1.3m telescope at CTIO + ANDICAM instrument from UT 2003 Aug 4.00 indicate that the source is starting a new outburst. The B, V, and I magnitudes were 12.8, 12.6 and 12.2, which is 1.1, 1.1 and 1.1 magnitudes above the predicted quiescent value. I-band data folded on the orbital period show activity as early as UT 2003 Aug 1.95. Observations at all wavelengths are encouraged. Our recent optical data from SMARTS are posted at http://phoenix.astro.yale.edu/buxton/smarts/v4641_2003outburst.html

V4641 optical outburst of 2003