{
  "bibcode": "2018GCN.22941....1K",
  "body": "D. A. Kann, L. Izzo (both HETH/IAA-CSIC), and A. Sota (IAA/CSIC) report \non behalf of HETH:\n\nWe observed the field of GRB 180705A (Stamatikos et al., GCN #22902) \nwith the 1.5-m OSN telescope in Granada, Spain.\n\nWe obtained 20 x 300 s images in the Ic band centered at 0.262416 days \n(6.3 hrs) after the GRB.\n\nAt the XRT position of the GRB (Goad et al., GCN #22906), there is a \npossible faint source, formally detected at Ic (Vega) = 23.6 +/- 0.2 \nmag. We note, however, that the background of the image is structured \nbecause of the proximity of the bright star HD 123921 (V ~ 9 mag), \ntherefore the detection may be spurious. The formal 3 sigma upper limit \nis Ic > 24 mag, also possibly overestimated.\n\nEven if the source we detect is not real, any afterglow of this GRB is \nclearly very faint, in agreement with other non-detection reports \n(Lipunov et al., GCN #22904, Watson et al., GCN #22911, Breeveld et al., \nGCN #22912, Mazaeva et al., GCN #22913, Bikmaev et al., GCN #22929).\n\nThe field was calibrated against SDSS secondary standard stars using the \ntransformation of Lupton (2005).",
  "circularId": 22941,
  "createdOn": 1531337141000,
  "email": "kann@iaa.es",
  "subject": "GRB 180705A: OSN observations",
  "submitter": "Alexander Kann at IAA-CSIC  <kann@iaa.es>",
  "eventId": "GRB 180705A"
}