{
  "bibcode": "2014GCN.17004....1T",
  "body": "A. Trotter, J. Haislip, D. Reichart, A. Aji, R. Beauchemin, T. Berger, \nA. Dow, A. Foster, N. Frank, M. Hinckle, K. Ivarsen, A. LaCluyze, M. \nMaples, J. Moore, M. Nysewander, C. Salemi, L. Zbinden, and J. A. Crain \nreport:\n\nSkynet observed the Swift BAT/XRT localization of GRB 141031A (Gompertz \net al., GCN 16995, Swift trigger=617110) with one 24\" telescope (PROMPT \n8; I band) and three 16\" telescopes (PROMPT 3,4,5; B,R,I bands) of the \nPROMPT array at CTIO, Chile.\nStarting at 2014-10-31 07:19:46 UT and continuing until 08:53 UT \n(t=79s-94m post-trigger), Skynet took a total of 196 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 \nreported by GROND (Tanga et al., GCN 16996).  Our 3-sigma limiting \nmagnitudes are:\n\n==================================\ntmid  scope   expos  fil  limit\n==================================\n52m  PROMPT3 26x160s  B   >20.9\n54m  PROMPT4 24x160s  R   >21.6\n53m  PROMPT5 27x160s  I   >20.9\n48m  PROMPT8 45x80s   I   >20.9\n==================================\n\nLimiting magnitudes are in the Vega System, calibrated to 6 APASS stars \nin the field.  Magnitudes have not been corrected for line-of-sight \nMilky Way dust extinction, with expected E(B-V)=0.15 (Schlafly & \nFinkbeiner 2011).\n\nNo further Skynet observations are scheduled.",
  "circularId": 17004,
  "createdOn": 1414783202000,
  "email": "atrotter@physics.unc.edu",
  "subject": "GRB 141031A: Skynet PROMPT-CTIO Observations",
  "submitter": "Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet  <atrotter@physics.unc.edu>",
  "eventId": "GRB 141031A"
}