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A mm-wave Flare from Cyg X-3

on 22 May 2009; 22:19 UT
Distributed as an Instant Email Notice (Request for Observations)
Password Certification: Masato TSUBOI (

Subjects: Radio, Millimeter, Request for Observations, Binaries, Black Holes, Transients

We report that the microquasar Cyg X-3 (20:32:25.77, 40:57:27.97, J2000) is currently undergoing a mm-wave flare. A peak activity exceeding 0.4 Jy at 43 GHz has been detected with the 45-m telescope of the Nobeyama Radio Observatory at 2009/05/20 20:40 (UT), followed by a decay with an e-folding time of 150 min. At 86 GHz, the peak is higher than 0.3 Jy, and the rise and decay profile shows a more complicated structure. The daily monitoring by the 45-m will be continued at least till 05/31. Follow up at all frequencies are strongly encouraged.

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R. E. Rutledge , Editor
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