Difference: GCNCIRCULAR21551 ( vs. 1)

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META TOPICPARENT	name="LVCGCNs"

TITLE: GCN CIRCULAR
NUMBER: 21551
SUBJECT: LIGO/Virgo G298048: Magellan g-band Imaging of the Potential Optical Counterpart Associated with NGC 4993
DATE: 17/08/18 07:54:23 GMT
FROM: Mansi M. Kasliwal at Caltech <mansi@astro.caltech.edu>

J. D. Simon, B. J. Shappee, M. R. Drout (Carnegie), D. A. Coulter, R. J. Foley, C. D. Kilpatrick, M. R. Siebert (UCSC), K. Boutsia, J. Bravo, G. Prieto (Las Campanas Observatory), and A. L. Piro (Carnegie)

On 2017 Aug 18.01 UT we obtained g-band images of the transient source SSS17a (RA = 13:09:48.09 DECL. = -23:22:53.35, Coulter et al. 2017; GCN 21529) possibly associated with LIGO/Virgo G298048, with LDSS-3 on the 6.5m Magellan-Clay telescope at Las Campanas Observatory. We measure a provisional magnitude of g = 17.2 +/- 0.1, consistent with the blue color reported spectroscopically by Drout et al. 2017 (GCN 21547) and at redder wavelengths by Nicholl et al. 2017 (GCN 21541). We also note a tentative detection of a slight decrease in brightness over three exposures spanning 12 minutes. Further analysis is ongoing.

-- ShaonGhosh - 18 Aug 2017

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