{
  "bibcode": "2021GCN.29319....1K",
  "body": "D. A. Kann (HETH/IAA-CSIC), A. de Ugarte Postigo (HETH/IAA-CSIC, \nDARK/NBI), C. C. Thoene (HETH), M. Blazek, J. F. Agui Fernandez (both \nHETH/IAA-CSIC), and J. I. Vico Linares (CAHA) report:\n\nWe observed the afterglow position (Ambrosi et al., GCN #29289) of the \nbright Swift GRB 210112A (Swift detection: Ambrosi et al., GCN #29289; \nAGILE detection: Ursi et al., GCN #29293; Konus-Wind detection: Svinkin \net al., GCN #29315) with CAFOS at the 2.2m telescope at Calar Alto, \nAlmeria, Spain, in the Ic band. We obtained 10 x 360 s exposures, \ncentered at 5.1696 days after the GRB, under good conditions but \nmediocre seeing.\n\nThe afterglow (Kann et al., GCNs #29296,29300; Siegel et al., GCN \n#29303) is faintly detected. We measure Ic = 23.69 +/- 0.24 mag. (AB \nmag, vs. a several nearby SDSS stars converted to Ic following the \nLupton transformations, then transformed back to AB mag).\n\nThis magnitude lies slightly above the extrapolation of the decay found \nduring the first two epochs (Kann et al., GCN #29300) and may indicate \nan underlying host galaxy. Indeed we also see another faint, possibly \nextended source about 2\" to the East, at RA (J2000) = 14:36:01.453, Dec. \n(J2000) = +33:03:13.40, which may be the host galaxy or a system \ninteracting with it. However, the rough redshift estimate of z ~ 2 (Kann \net al., GCN #29296) would imply this must be a very luminous system, or \na foreground interloper.",
  "circularId": 29319,
  "createdOn": 1610985235000,
  "email": "kann@iaa.es",
  "subject": "GRB 210112A: Deep CAHA 2.2m detection",
  "submitter": "Alexander Kann at IAA-CSIC  <kann@iaa.es>",
  "eventId": "GRB 210112A"
}