{
  "bibcode": "2021GCN.30884....1K",
  "body": "D. A. Kann (HETH/IAA-CSIC), A. Rossi (INAF-OAS), A. de Ugarte Postigo \n(HETH/IAA-CSIC, DARK/NBI), C. Thoene, M. Blazek, J. F. Agui Fernandez \n(all HETH/IAA-CSIC), and F. Aceituno (IAA) report:\n\nWe obtained observations of the enhance XRT position (Goad et al., GCN \n30850) of the Swift short GRB 210919A (Tohuvavohu et al., GCN #30846) \nwith the 1.5m telescope of OSN, Granada, Spain. We obtained 35 x 120 s \nimages in the Rc band, starting at 03:28:22 UT on September 19, under \ngood observing conditions. We obtained a second epoch, with 41 x 120 s \nimages, the following night, starting at 2:59:51 UT on September 20.\n\nThe source detected by Kann et al. (GCN #30883) is very faintly detected \nin the first epoch.\n\nUsing the same comparison stars from the PanSTARRS catalog as used by \nKann et al. (GCN #30883) (transformed to Rc via the Lupton equations, \nthen transformed back to AB magnitudes), we measure:\n\nRc = 24.47 +/- 0.53 mag @ 0.14944 d after trigger (AB mag).\n\nThe source is undetected in the second epoch, but it is shallower, with \nRc > 23.6 mag (AB) @ 1.13649 d after the GRB. We note this detection is \nalso fainter than the upper limits listed in Kann et al. (GCN #30883).",
  "circularId": 30884,
  "createdOn": 1632697287000,
  "email": "kann@iaa.es",
  "subject": "GRB 210919A OSN 1.5m Source Confirmation",
  "submitter": "Alexander Kann at IAA-CSIC  <kann@iaa.es>",
  "eventId": "GRB 210919A"
}