TITLE: GCN CIRCULAR NUMBER: 18803 SUBJECT: LIGO/Virgo G211117: CSS/CRTS observations on 29/30 Dec 2015 UT DATE: 16/01/02 09:15:51 GMT FROM: Ashish Mahabal at Caltech A.A. Mahabal, S.G. Djorgovski, A.J. Drake, M.J. Graham (Caltech), E.J. Christensen, D.C. Fuls, A.R. Gibbs, A.D. Grauer, J.A. Johnson, R.A. Kowalski, S.M. Larson, G.J. Leonard, R.G. Matheny, R.L. Seaman, F.C. Shelly (LPL). CSS/CRTS observed the following fields using 0.7m Schmidt telescope with 2.8x2.8 sq. degrees FOV with the standard cadence of 4 30-second images 10 minutes apart and did not find any outstanding EM-counterpart candidates to 19.5 mag (2.6-sigma). UT times mentioned below are of the first image of the sequence of 4. Total area covered is approximately 112 sq. degrees. Field RA (deg) Dec (deg) Date/Time (UT) ————————————————————————————— N26014 41.8963 26.8111 20151230 07:32:08.8 N29014 43.0087 29.6333 20151230 07:31:25.5 N26015 44.9996 26.8111 20151230 07:29:59.1 N29015 46.1946 29.6333 20151229 03:31:29.2 N32015 47.4542 32.4556 20151229 03:30:46.0 N35015 49.2450 35.2778 20151229 03:30:02.8 N29016 49.3804 29.6333 20151229 03:29:19.6 N38015 50.6796 38.1000 20151229 03:28:34.0 N32016 50.7271 32.4556 20151229 03:27:50.7 N35016 52.6412 35.2778 20151229 03:26:24.2 N38016 54.1746 38.1000 20151229 03:24:57.8 N35017 56.0375 35.2778 20151230 07:29:14.8 N38017 57.6696 38.1000 20151230 07:28:31.6 N40017 59.9996 40.9222 20151230 07:27:05.1 —————————————————————————————