TITLE: GCN CIRCULAR NUMBER: 20871 SUBJECT: LIGO/Virgo G277583: TAROT Calern (TCA) observations DATE: 17/03/15 11:20:26 GMT FROM: Michel Boer at CESR-CNRS M. Boer, R. Laugier, K. Noysena (ARTEMIS - UCA/CNRS/OCA), A. Klotz (IRAP - OMP/UPS/CNRS) report on behalf of the TZAC collaboration: We have observed about 135 sq. deg. of the error box of G277583 in 36 fields during the night of 14-15 March, starting at 18h10 UT at TCA (TAROT Calern Observatory). Each exposure lasted 120s, with no filter. Sky conditions were good, and the images are being examinated. The list of the field centers follows: Index Ra Dec 0 05:49:43.36' +20:35:54.6 1 05:54:55.60' +18:38:09.5 2 05:49:51.76' +22:17:42.1 3 05:53:25.62' +24:25:48.8 4 05:57:51.55' +20:34:17.6 5 05:58:01.71' +22:27:34.7 6 06:05:57.39' +21:55:44.4 7 06:04:43.28' +24:04:45.5 8 06:14:10.43' +21:51:14.3 9 06:13:06.44' +24:08:47.3 10 06:20:05.27' +26:04:06.9 11 06:30:25.58' +23:24:28.6 12 06:24:06.40' +27:57:13.6 13 06:29:33.19' +25:26:56.6 14 06:39:59.35' +24:27:36.7 15 06:35:43.67' +29:13:31.2 16 06:38:15.47' +27:12:43.7 17 06:53:38.60' +22:33:21.6 18 06:50:05.18' +28:32:13.6 19 06:52:10.23' +30:33:05.3 20 07:04:09.58' +23:51:32.4 21 06:59:41.61' +28:24:19.1 22 07:04:48.51' +25:51:21.9 23 07:13:16.96' +23:23:27.8 24 07:13:36.84' +25:22:33.4 25 07:09:21.06' +31:30:15.8 26 07:08:59.26' +29:36:45.6 27 07:12:59.10' +27:47:40.1 28 07:20:11.66' +29:39:59.8 29 07:25:09.46' +25:13:34.1 30 07:22:33.86' +27:25:27.6 31 07:33:59.92' +25:28:39.7 32 07:28:56.40' +29:34:52.1 33 07:34:35.36' +27:36:11.8 34 06:50:15.75' +24:37:59.6 35 06:47:35.50' +26:33:37.1