TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  2937
SUBJECT: ATCA observations of SGR 1806-20
DATE:    05/01/05 21:01:30 GMT
FROM:    Chryssa Kouveliotou at MSFC  <chryssa.kouveliotou-1@nasa.gov>

J. Gelfand (CfA), B. M. Gaensler (CfA), K. Newton-McGee (U. Sydney),
C. Kouveliotou (NASA/MSFC, NSSTC), R. Wijers (U. Amsterdam), M. Garrett (JIVE),
M. Finger, P. Woods, S. Patel (USRA, NSSTC), M. McLaughlin (Jodrell Bank),
R. Fender (U. Southampton), T. Delaney (CfA) report on behalf of a
larger team:

We observed the soft gamma-ray repeater SGR 1806-20 with the Australian
Telescope Compact Array (ATCA) on January 5, 2005 for two hours (mean
epoch approx 2000 UT).  (See GCN #2928, #2929, #2933; ATEL #373, #375
for earlier results).

Preliminary flux levels for 2005-Jan-05.83 are as follows:

2.4 GHz: 87(2) mJy
4.8 GHz: 53(1) mJy
8.6 GHz: 29(1) mJy

We observe a possible break in the source spectrum. The power law spectral index
between 4.8 and 8.6 GHz is -1.0, while between 2.4 and 4.8 GHz the index is -0.7.
Further observations will take place on January 6.