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GCN Circular 18655

Subject
LIGO/Virgo G184098: Results of of 2nd epoch of ASKAP follow-up
Date
2015-12-02T12:42:58Z (8 years ago)
From
Keith Bannister at ATNF <keith.bannister@csiro.au>
K. Bannister (CSIRO), J. Marvil (CSIRO), I. Heywood (CSIRO), R. Wark 
(CSIRO), M. Bell (CSIRO), T. Murphy (University of Sydney), D. Kaplan 
(UWM), S. Chatterjee (Cornell) on behalf of the ASKAP/VAST team.

We observed the Southern probability maximum with BETA - the ASKAP 
engineering test array. The observations comprise 18 pointings covering 
a strip approximately 40 degrees long and 5 degrees high, centered on 
07h27m51s -70d15m39s (J2000) and following the ridge of the probability 
maximum.

We observed at center frequency of 863.5 MHz with a a bandwidth of 300 
MHz. Observing began at 2015-09-26 13:15:00 UT and continued for 19.5 hrs.

Our images have an average RMS of 1 mJy/beam. We cross matched all 
sources from our images with the SUMSS and MGPS2 catalogs, which are 
complete above 14 mJy. We found 3 sources not in the catalog, but visual 
inspection of the SUMSS [1] and MPGS2 [2] images indicates the presence 
of a source in all cases. Thus, we detect no transients above 14 mJy 
with respect to those surveys.

We continue to process another earlier observation of the same field.


[1] Mauch et al. 2003, MNRAS, 342, 1117
[2] Murphy et al. 2007, MNRAS, 382, 382
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