Difference: GCNCIRCULAR21533 ( vs. 1)
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NUMBER: 21533 SUBJECT: LIGO/Virgo G298048: Optical Candidate Shows No Evidence for Previous Activity in Archival ASAS-SN Data DATE: 17/08/18 02:06:30 GMT FROM: Philip Cowperthwaite at Harvard U <pcowperthwaite@cfa.harvard.edu> P. S. Cowperthwaite (Harvard), R. J. Foley (UCSC), E. Berger (Harvard), We investigate ASAS-SN public data at the position of the transient source SSS17a (RA = 13:09:48.09 DECL. = -23:22:53.35, Coulter et al. 2017 GCN 21529). This source is also seen in DECam observations (Chornock et al. GCN 21530) and DLT data (Yang et al. GCN 21531). We search the last 100 days of available data, finding no strong evidence for variability at this position. The most recent observation is UT = 2017-08-14.9933703 (HJD = 2457980.49073), approximately 2 days before the GW trigger. The data can be found here: https://asas-sn.osu.edu/public/light_curve/ede9a693-78be-4049-85a0-7de11bc61c3a 
The photometry is generated by placing an aperture at the indicated
coordinates, and therefore includes light from the host galaxy.
The light curve is flat with a mean magnitude of 13.45 mag with a scatter
of 0.05 mag. This indicates that the transient is most likely a young
source.
-- ThomasKupfer - 18 Aug 2017 | |||||||
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