Radio Monitoring of V4641 with RATAN-600

ATel #300; S. A. Trushkin (SAO RAS)
on 8 Jul 2004; 19:38 UT
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Credential Certification: Sergei Trushkin (satr@sao.ru)

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We have daily observed V4641 from 9 May up today at 2.3, 4.8, 7.7, 11.2 and 21.7 GHz with RATAN-600 radio telescope. We have reliably detected V4641 June 25, 21:20UT:

• Freq. mJy err
•  2.3 160 25
•  4.8 250 25
•  7.7 270 30
• 11.2 285 30

July 03, 20:44UT:

• Freq. mJy err
•  2.3 215 25
•  4.8 350 30
•  7.7 335 30
• 11.2 275 30
• 21.7 300 35

and July 04, 20:40UT:

• Freq. mJy err
•  2.3 78 15
•  4.8 66 10
•  7.7 93 20
• 11.2 33 10

See the graph of the spectra: http://cats.sao.ru/~satr/XB/1819-25/v4641_sp.gif. There are no detectable signals 5,6,7 July ~20:30UT and before 25 June. Thus the detected radio flares decayed during 1-2 days. We will continue observations V4641 to 17 August.