GCN Circular 2424
Subject
GRB030329: radio observations at RT-22 (CrAO)
Event
Date
2003-10-20T16:06:19Z (23 years ago)
From
Vasilij Rumjantsev at CrAO <rum@crao.crimea.ua>
A.Volvach, I.Strepka (CrAO) on behalf of CrAO/IKI/SAO collaboration report:
We have observed the radio afterglow position (E.Berger et al, GCN2014) of
GRB030329 (R. Vanderspek et al, GCN1997) in June 26 at 4.8GHz, in July 8 at
22GHz, and in September at 4.8 and 8GHz with 22-m radio telescope RT-22 of
Crimean Astrophysical Observatory. The radio source was detected at 22 GHz
and upper limits have been obtained for other frequencies. The flux
densities are:
Date,UT Frequency Duration Flux density
GHz hrs mJy
Jun. 26 4.8 2 21.0 (3 sigma upper limit)
Jul. 08 22 2 6.9 +-2.3
Sep. 23 8 2 9.0 (3 sigma)
Sep. 25 4.8 3 7.5 (3 sigma)
The sensitivity at 4.8 GHz was significantly improved in September with
introducing in operation a cryo-radiometer. In September we detected a
signal at 4.8 GHz, however the beam of RT-22 (12 arcmin) covers 3 sources
found in NVSS (Condon et al. 1998, AJ, 115, 1693).The upper limit of flux
density on Sep. 25 includes statistical errors and uncertainty of spectral
indices of the 3 sources.
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