{
  "bibcode": "2018GCN.23239....1D",
  "body": "A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), L. Izzo (HETH/IAA-CSIC), \nD.A. Kann (HETH/IAA-CSIC), C.C. Thoene (HETH/IAA-CSIC), H. Vazquez \nRamio (CEFCA), N. Maicas (CEFCA) and V. Tilve (CEFCA) report:\n\nWe have observed the field of GRB 180914B (Ursi et al., GCN 23226; \nVerrecchia et al., GCN 23231; Bissaldi et al. GCN 23232; D���Ai et al., GCN 23236) \nwith the 0.8m T80 telescope of the Javalambre Astrophysical Observatory \n(Teruel, Spain). The observation consisted of 12x300s i-band exposures, each \ncovering the complete LAT error box. The exposures started at 22:03:46 UT of \nthe 15th September, 27.68 hr after the burst. The counterpart identified by Zheng \n& Filippenko (GCN 23237) and Troja et al. (GCN 23238) is well detected in the \nindividual images. Photometry of the first epoch, as compared with SDSS \nreference stars yields i(AB)=18.84+/-0.03.\n\nComparing with the RATIR photometry (roja et al. GCN 23238), our photometry \nimplies a decay rate of alpha ~ -1.9 (where F_nu ~ t^alpha), indicating that the \nafterglow has possibly entered a post-jet-break regime evolution.",
  "circularId": 23239,
  "createdOn": 1537088296000,
  "email": "deugarte@iaa.es",
  "subject": "GRB 180914B: Optical counterpart observation from OAJ",
  "submitter": "Antonio de Ugarte Postigo at IAA-CSIC  <deugarte@iaa.es>",
  "eventId": "GRB 180914B"
}