{
  "bibcode": "2019GCN.25565....1V",
  "body": "A. F. Valeev (SAO-RAS), A. J. Castro-Tirado, Y.-D. Hu, and E. \nFernandez-Garcia (IAA-CSIC), V. V. Sokolov (SAO-RAS), I. Carrasco and A. \nCastellon (UMA) D. Garcia Alvarez (GRANTECAN, IAC, ULL) and M. Rivero \n(GRANTECAN), on behalf of a larger collaboration, report:\n\nFollowing the detection of GRB 190829A by Fermi (GCNC 25551) and Swift \n(Dichiara et al., GCN 25552), we obtained optical imaging and \nspectroscopy of the proposed optical counterpart (Xu et al. GCNC 25555, \nLipunov et al. GCNC 25558, Kumar et al. GCNC 25560) covering the range \n3700-10000 A with the 10.4m GTC telescope equipped with OSIRIS in La \nPalma (Spain) starting on Aug 30, 03:00 UT.\n\nOn Aug 30, 3:00 UT, we measure i = 18.42 +/- 0.05. The GRB 190829A \noptical afterglow spectrum displays a red continuum consistent with the \nNOT results (Heintz et al. GCNC 25563). We find the Ca H & K doublet \n(3933 & 3969 A) in absorption in the afterglow spectrum, which also \nshows the emission lines of the underlying SDSS galaxy \nJ025810.28-085719.2 at redshift z = 0.0785 +/- 0.005, thus supporting \nthe physical association between GRB 190829A and the galaxy.\n\nThus, GRB 198029A is one of the nearest GRBs detected to date. \nMultiwavelength follow-up observations are encouraged.\n\nThis message can be quoted.",
  "circularId": 25565,
  "createdOn": 1567147225000,
  "email": "ajct@iaa.es",
  "subject": "GRB 190829A: 10.4m GTC spectroscopy",
  "submitter": "Alberto J. Castro-Tirado at IAA-CSIC  <ajct@iaa.es>",
  "eventId": "GRB 190829A"
}