GCN Circular 212

T.J. Galama, P. Vreeswijk, E. Rol (U. of Amsterdam), R. Strom (NFRA
and U. of Amsterdam), J. van Paradijs (U. of Amsterdam and U. of
Alabama in Huntsville), C. Kouveliotou (USRA/MSFC), G. de Bruyn (NFRA
and U. of Groningen) report: 

"We observed the error box of GRB 990123 (GCN #199) at 4.88 GHz with
the Westerbork Synthesis Radio Telescope (WSRT) for 12 hours on
January 24.28 1999 UT. At the position of the optical transient (GCN
#201) we do not detect a radio source (< 130 microJansky; 3 sigma).
This result, when compared with the January 24.65 UT 8.46 GHz VLA
detection (260 +/- 32 microJansky; GCN #211) may be due to synchrotron
self-absorption, or otherwise, may indicate that the 4.88 GHz
observation was suppressed by interstellar scintillation.  Further
observations are planned."

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