{
  "bibcode": "2018GCN.23159....1F",
  "body": "E. Fernandez-Garcia, Y.-D. Hu, J. C. Tello, A. Ayala and A. J. \nCastro-Tirado (IAA-CSIC), I. Carrasco and C. Perez del Pulgar (Univ. de \nMalaga), M. D.\nCaballero-Garcia and M. Jelinek (ASU-CAS, CZ), R. Cunniffe (Inst. of \nPhysics, CZ) and R. Querel (NIWA), on behalf of a larger collaboration, \nreport:\n\nThe 60cm BOOTES-3/YA robotic telescope at NIWA Lauder in Otago (New \nZealand) automatically responded in 59s (and 193s after the GRB onset) \nto the Swift trigger of GRB 180821A (Tohuvavohu et al., GCNC 23158). The \nfirst images (clear filter) were obtained starting at 16:43:47 UT. At \nthe position of the Swift/XR X-ray position, no optical afterglow is \ndetected down to 19 mag on a 100s co-added image at 16:44:45 \n(mid-exposure), in agreement with the non-detection by Swift/UVOT. \nFurther analysis is ongoing.\n\nWe thank the staff at NIWA for its excellent support.",
  "circularId": 23159,
  "createdOn": 1534878548000,
  "email": "ajct@iaa.es",
  "subject": "GRB 180821A: BOOTES-3/YA optical observations",
  "submitter": "Alberto Castro-Tirado at Inst.de Astro. de Andalucia  <ajct@iaa.es>",
  "eventId": "GRB 180821A"
}