TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2941 SUBJECT: Further ATCA observations of SGR 1806-20 DATE: 05/01/07 15:19:09 GMT FROM: Bryan Gaensler at Harvard-Smithsonian/CfA J. Gelfand (CfA), B. M. Gaensler (CfA), K. Newton-McGee (U. Sydney), C. Kouveliotou (NASA/MSFC, NSSTC), G, Taylor (NRAO), R. Wijers (U. Amsterdam), M. Garrett (JIVE), M. Finger, P. Woods, S. Patel (USRA, NSSTC), M. McLaughlin (Jodrell Bank), R. Fender (U. Southampton) report on behalf of a larger team: We observed the soft gamma-ray repeater SGR 1806-20 with the Australia Telescope Compact Array (ATCA) using five 6-km baselines on January 6, 2005 (0530-0730 UT and 1930-2130 UT) and on January 7, 2005 (0430-0500 UT). Preliminary flux levels, are as follows (the number in parentheses indicates the 1-sigma uncertainty in the last significant figure): Frequency Flux (Jan 06.26) Flux (Jan 06.77) Flux (Jan 07.20) (GHz) (mJy) (mJy) (mJy) --------- ------------ -------------- ----------------- 1.4 103(2) 90(2) 86(3) 2.4 68(2) 66(2) 54(1) 4.8 45(2) 38(1) 6.1 30(2) 8.6 23(1) There is clear evidence for a spectral break from the first two of the above epochs, possibly decreasing to lower frequencies as a function of time.