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GMRT Low frequency radio observation of Cyg X-3 at the time of flare

ATEL # 1100; Sabyasachi pal and A. Pramesh Rao (NCRA-TIFR, India)
on 8 Jun 2007; 14:17 UT
Distributed as an Instant Email Notice (Transients)
Password Certification: Sabyasachi Pal (

Subjects: Radio, Black Holes, Transients

Trushkin et al. (#Atel 1092) detected beginning of a new flaring activity in galactic black hole candidate Cygnus X-3. We have observed the source from UT 2.99 June to 3.08 June, 2007 in 243 and 614 MHz frequencies using Giant Meterwave Radio Telescope (GMRT). The source was variable and seemed to rise during our observation. The rising phase is also clear from swift data . The average flux density during our observation in 614 MHz is 3.4+-0.2 Jy and in 243 MHz is 1.1+-0.2 Jy and the corresponding spectral index in this low frequency region is 1.1.

Further observations are planned.

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