{
  "bibcode": "2013GCN.15235....1T",
  "body": "A. Trotter, D. Reichart, J. Haislip, A. LaCluyze, J. Moore, N. Frank, K. \nIvarsen, M. Nysewander, A. Foster, T. Berger, H. T. Cromartie, R. Egger, \nM. Maples, and J. A. Crain report:\n\nSkynet observed the Swift-BAT localization of GRB 130919A (Krimm et al., \nGCN 15232; Lien et al., GCN 15234, Swift trigger=571271) with three 16\" \ntelescopes of the PROMPT array at CTIO, Chile (V, R, and I bands).\n\nStarting at 2013-09-19, 23:29 UT and continuing until 2013-09-20, 00:00 \nUT (t=12.40-12.93h post-trigger), Skynet took a total of 49 160s \nexposures, at high airmass >3. In stacked images, we do not detect any \nuncatalogued optical source in any band in or near the Swift-BAT error \ncircles.  The 3-sigma limiting magnitudes of our images are:\n\n==================================\ntmid    scope   expos   fil  limit\n==================================\n12.67h  Prompt5 12x160s  I  >19.44\n12.55h  Prompt4  7x160s  R  >19.24\n12.63m  Prompt1 10x160s  V  >19.54\n==================================\n\nMagnitudes are in the Vega System, calibrated to 8 APASS-DR7 stars in \nthe field.  Magnitudes have not been corrected for line-of-sight Milky \nWay dust extinction, with expected E(B-V)=0.057 (Schlegel et al. 1998).\n\nNo further Skynet observations are scheduled.",
  "circularId": 15235,
  "createdOn": 1379649859000,
  "email": "atrotter@physics.unc.edu",
  "subject": "GRB 130919A: Skynet PROMPT-CTIO optical upper limits",
  "submitter": "Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet  <atrotter@physics.unc.edu>",
  "eventId": "GRB 130919A"
}