GRB221009A/Swift J1913.1+1946: RATAN-600 measurements
ATel #15671; S. A. Trushkin, N. N. Nizhelskij, P. G. Tsybulev, A. K. Erkenov (SAO RAS)
on 12 Oct 2022; 18:30 UT
Credential Certification: Sergei Trushkin (satr@sao.ru)
Subjects: Radio, Millimeter, Gamma Ray, Request for Observations, Gamma-Ray Burst
Today on 12 October 2022 (MJD 59864.627) we have carried out the
observation of the Swift J1913.1+1946, probably the candidate gamma-ray
burst GRB 221009A. We have detected the fluxes from a point source
with the known coordinates: 5+/-2, 36+/-8, 20 +/- 8 mJy at 4.7, 8.2,
and 11.2 GHz respectively. Data is preliminary and will be confirmed
after repeated measurements on 14 October and after. The spectra of the
previous multi-frequency measurements with AMI-LA (ATel #15653) and ATA
(ATel #15655) and today ones with RATAN (after ~2.5 days) are generally
similar (see the plot), probably remaining optically thick at frequencies
lower than 8-10 GHz.
Radio spectrum of Swift1913.1+1946 with the RATAN-600 radio telescope
