{
  "bibcode": "2005GCN..3104....1C",
  "body": "B. E. Cobb and C. D. Bailyn (Yale), part of the larger SMARTS\nconsortium, report:\n\nUsing the ANDICAM instrument on the 1.3m telescope at CTIO, we\nobtained optical/IR imaging of the error region of GRB 050315\n(GCN 3094, Parsons et al.) beginning ~11.6 hours post-burst\n(2005-03-16 08:35:09 UT).  Total summed exposure times amounted\nto 180s in BRIYJK and 120s in H and V.\n\nAn optical source is detected in R and I at the coordinates of the \nreported optical afterglow candidate (GCN 3100, Kelson & Berger).  This \nsource is, however, only slightly brighter than our detection limits.  \nPreliminary comparison with Landolt Standard PG 1047+003 and USNO B1.0 \nstars yields the following approximate afterglow magnitudes:\n\n         R = 20.9\n         I = 20.3\n\nNo source was detected in B or V with upper limits of B > 22.3 and V > 21.4.\n\nAdditionally, the afterglow candidate is not detected in the IR images to \nthe following detection limits (obtained by comparison with 2MASS):\n\n         J > 18.0\n         H > 17.4\n         K > 16.3",
  "circularId": 3104,
  "createdOn": 1111011482000,
  "email": "cobb@astro.yale.edu",
  "subject": "GRB 050315, SMARTS optical/IR afterglow observations",
  "submitter": "Bethany Cobb at Yale U  <cobb@astro.yale.edu>",
  "eventId": "GRB 050315"
}