{
  "bibcode": "2020GCN.27860....1K",
  "body": "D. A. Kann (HETH/IAA-CSIC), A. de Ugarte Postigo (HETH/IAA-CSIC, \nDARK/NBI), M. Blazek, C. C. Thoene, J. F. Agui Fernandez (all \nHETH/IAA-CSIC), and I. Hermelo (CAHA) report:\n\nWe observed the XRT error circle (Evans et al., GCN #27836) of the \nbright GRB 200528A (Swift detection: Ambrosi et al., GCN #27832; Fermi \nGBM detection: The Fermi GBM team, GCN #27831) with the 2.2m telescope \nat CAHA (Almeria, Spain), equipped with the CAFOS detector. We obtained \n21 x 180 s exposures in the Ic band under adverse observing conditions \n(moonlight, bad seeing and transparency).\n\nAt the enhanced XRT position, we detect no source (but would have \npreferred to). We derive a 3 sigma limiting magnitude of Ic > 23.5 mag \n(Vega) at 0.440865 days after the GRB, calibrated against SDSS standard \nstars transformed to the Ic band following Lupton (2005). This limit is \ncomparable to those achieved by NOT about an hour later (Malesani et \nal., GCN #27842).",
  "circularId": 27860,
  "createdOn": 1590792241000,
  "email": "kann@iaa.es",
  "subject": "GRB 200528A: CAHA Upper Limit",
  "submitter": "Alexander Kann at IAA-CSIC  <kann@iaa.es>",
  "eventId": "GRB 200528A"
}