{
  "bibcode": "2016GCN.19668....1Z",
  "body": "WeiKang Zheng, Alexei V. Filippenko (UC Berkeley), and Melissa Graham\n(University of Washington) report on behalf of the KAIT GRB team:\n\nWe observed the field of GRB 160703A (Cenko et al., GCN 19645)\nwith the 10 m Keck-I telescope on July 3 starting at 13:17:55 UT, \nor 1.125 hours after the burst. A 180 s g'-band image and a 150 s \nR-band image were taken simultaneously with LRIS. We detect the\noptical afterglow (Tachibana et al., GCN 19652; Kuroda et al., \nGCN 19653; Hagen & Cenko, GCN 19656) in both the g' and R \nimages.\n\nThe afterglow is well separated in our images from the nearby\nsource N2JN062852 noted by Tachibana et al. (GCN 19652).\nWe measure the afterglow to be 1.58\" west and 1.30\" north of \nN2JN062852. A finding chart is posted at website URL\nhttp://w.astro.berkeley.edu/~zwk/grb/GRB160703A/GRB160703A_keck_lris_g_fc.png .\n\nWe find that the afterglow had a brightness of R=17.9 mag at\n1.125 hours after the burst, calibrated with the USNO B1.0 R2 system.",
  "circularId": 19668,
  "createdOn": 1468037962000,
  "email": "weikang@berkeley.edu",
  "subject": "GRB 160703A: Keck-I/LRIS Optical Observations",
  "submitter": "Weikang Zheng at UC Berkeley  <weikang@berkeley.edu>",
  "eventId": "GRB 160703A"
}