{
  "bibcode": "2014GCN.16318....1V",
  "body": "A. Volnova (IKI), A.V. Kusakin (Fesenkov Astrophysical Institute)  A.V. \nKhruslov (INASAN), A. Pozanenko (IKI) report on behalf of larger GRB \nfollow-up collaboration:\n\nWe observed the optical afterglow (Elenin et al., GCN 16143; Kaur et \nal., GCN 16144; Ferrante et al., GCN 16145; Chester et al., GCN 16147;\nMaehara et al., GCN 16151) of the Swift GRB 140423A (Sonbas et al.,\nGCN 16142) with Zeiss-1000 (East) 1m telescope of Tien Shan Astronomical \nObservatory on Apr., 23 and Apr., 24. We took several images in R-filter \nof 300 and 540 s  exposures in three epochs.\n\nDetails of the photometry are following:\n\ndate        UT start   t-T0       Filter  Exp.  OT\n                       (mid, days)          (s)\n2014-04-23 R 15:04:19  0.291036   R     8*300  20.47 0.14\n2014-04-23 R 19:04:44  0.450758   R     6*300  20.70 0.20\n2014-04-24 R 15:20:01  1.322830   R    12*540  22.17 0.10\n\nThe photometry is based on  SDSS stars, R (gri -> R transformations by \nLupton 2005):\n\nSDSS id                      R\nJ130914.51+494636.5   18.661+/-0.019\nJ130911.04+494854.6   20.209+/-0.053\nJ130924.79+494946.6   19.533+/-0.038\n\nThe light curve of the afterglow based on our previous an later \nobservations (GCNs  16143, 16148, 16168, 16247, 16264) can be found in\nhttp://grb.rssi.ru/GRB140423A/grb140423a-lc.png",
  "circularId": 16318,
  "createdOn": 1400775811000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 140423A: TShAO optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 140423A"
}