{
  "bibcode": "2014GCN.16967....1T",
  "body": "A. Trotter, J. Haislip, D. Reichart, V. Hoette, K. Cudworth, D. Harper, \nR. Kron, T. Linder, R. Russell, E. Struble, A. Aji, R. Beauchemin, T. \nBerger, A. Dow, A. Foster, N. Frank, M. Hinckle, K. Ivarsen, A. \nLaCluyze, M. Maples, J. Moore, M. Nysewander, C. Salemi, L. Zbinden, and \nJ. A. Crain report:\n\nSkynet observed the Swift BAT/XRT localization of GRB 141026A (Hagen et \nal., GCN 16950, Swift trigger=616502) with one 24\" telescope (PROMPT 8; \nI band) and four 16\" telescopes (PROMPT 3,1,4,5; BVRI bands) of the \nPROMPT array at CTIO, Chile, and with the 41\" telescope of Yerkes \nObservatory in Wisconsin, USA (g'r'i' bands).\nStarting at 2014-10-26 02:38:30 UT and continuing until 03:03 UT \n(t=1.5-26m post-trigger), Skynet took a total of 89 exposures ranging \nfrom 10s-160s each. We stacked subsets of these images to maximize the \nS/N ratio, and detected no optical source in any band at the OT position \nfirst reported by RATIR (Littlejohns et al., GCN 16952), and confirmed \nin later notices.  Our 3-sigma limiting magnitudes are:\n\n==================================\ntmid  scope   expos  fil  limit\n==================================\n10m  PROMPT3  4x80s   B   >19.9\n20m  PROMPT1  4x160s  V   >20.4\n19m  PROMPT4  3x160s  R   >19.8\n17m  PROMPT5  4x80s   I   >19.9\n               4X160s\n17m  PROMPT8 12x80s   I   >20.0\n63m  Yerkes   1x80s   g'  >21.2\n               2x160s\n60m  Yerkes   2x80s   r'  >20.9\n               1x160s\n66m  Yerkes   1x80s   i'  >20.5\n               1x160s\n==================================\n\nBVRI magnitudes are in the Vega System, and g'r'i' magnitudes are in the \nAB system, calibrated to 4 APASS stars in the field.  Magnitudes have \nnot been corrected for line-of-sight Milky Way dust extinction, with \nexpected E(B-V)=0.16 (Schlafly & Finkbeiner 2011).\n\nNo further Skynet observations are scheduled.",
  "circularId": 16967,
  "createdOn": 1414441594000,
  "email": "atrotter@physics.unc.edu",
  "subject": "GRB 141026A: Skynet PROMPT-CTIO/Yerkes-41 Observations",
  "submitter": "Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet  <atrotter@physics.unc.edu>",
  "eventId": "GRB 141026A"
}