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GCN Circular 2941

Subject

Further ATCA observations of SGR 1806-20

Date

2005-01-07T15:19:09Z (20 years ago)

From

Bryan Gaensler at Harvard-Smithsonian/CfA <bgaensler@cfa.harvard.edu>

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.