Radio and X-ray monitoring of Cygnus X-1 during the recent state change

Astronomy and Astrophysics – Astronomy

Scientific paper

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Radio, X-Ray, Request For Observations, Binaries, Black Holes, Transients

Scientific paper

Following the reports of a state transition in the BHC Cygnus X-1 around 28 June (Atels #2711, #2714 and #2715), we triggered multiple X-ray and radio observations to observe a possible spectral state change. Further evidence of a spectral state change also appeared in the Fermi-GBM observations, showing a rapid fall in hard X-rays around 29 June - 01 July 2010 (Atel #2721). High-resolution radio observations were first taken by MERLIN at 6cm on: 2010 July 02 20:00 - 2010 July 03 10:00 UT 2010 July 03 16:00 - 2010 July 04 10:00 UT 2010 July 04 16:00 - 2010 July 05 10:00 UT Results showed an unresolved source with a slightly variable peak brightness of about 10 mJy/bm (beam size of about 44 x 50 mas).

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