{
  "bibcode": "2018GCN.22713....1H",
  "body": "Kasper Elm Heintz (Univ. Iceland and DAWN/NBI), Daniele Malesani (DAWN/NBI and DARK/NBI), Lauri Siltala (NOT), and Pilar Montanes Rodriguez (IAC), report on behalf of a larger collaboration:\n\nWe observed the field around GRB 180512A (Deich et al., GCN 22710) with the 2.5-m Nordic Optical Telescope (NOT) equipped with ALFOSC.\n\nObservations of 3x100 s were carried out in each of the SDSS r, i, and z filters and started at 22:48:54 UT on May 12, 47 min after trigger. We do not detect the optical counterpart within the Swift-XRT error circle and calibrated against Pan-STARRS local photometry we measure upper limits (at 3-sigma) of:\n\nm(r) > 23.3, m(i) > 23.0, and m(z) > 22.1 AB mag.\n\nThese magnitudes are not corrected for Galactic extinction in the direction of the GRB.\n\n[GCN OPS NOTE(12may18): Per author's request, a typo in the author name Rodriguez was corrected.]",
  "circularId": 22713,
  "createdOn": 1526170515000,
  "email": "keh14@hi.is",
  "subject": "GRB 180512A: NOT upper limits",
  "submitter": "Kasper Elm Heintz at Univ. of Iceland and DAWN/NBI  <keh14@hi.is>",
  "eventId": "GRB 180512A"
}