{
  "bibcode": "2014GCN.15744....1V",
  "body": "A.Volnova (IKI), E. Klunko (ISTP), M. Eselevich(ISTP), A. Pozanenko(IKI) \nreport on behalf of larger GRB follow-up collaboration:\n\nWe analyzed observations of AZT-33IK telescope of Sayan observatory, \nMondy (Klunko et al., GCN 15704; Volnova et al., GCN 15713) of the \nSwift GRB 140108A (Racusin et al., GCN 15699).  Using bright time \ninterval of the afterglow we calculated coordinates of the OT:\n\nRA(J2000)=   21:40:26.75\nRA(J2000)=  +58:44:41.3\nwith uncertainty of 0.4 arcsec of each coordinate.\n\nThe OT coordinates are within the enhanced XRT position (Osborne et al., \nGCN 15705) and compatible with positions reported early (Gorbovskoy et \nal., GCN 15701; Strobl et al., 15703).\n\nThe light curve of the afterglow can be found in \nhttp://grb.rssi.ru/GRB140108A/GRB140108A_lc_preliminary.png.\n\nThe photometry is based on USNO-B1.0 stars:\ns1\t1487-0322168\t21:40:30.85\t+58:43:53.1\t18.18\ns2\t1487-0322049\t21:40:20.16\t+58:43:58.3\t17.96\ns3\t1487-0322069\t21:40:21.62\t+58:45:00.6\t17.29\ns4\t1487-0322305\t21:40:41.61\t+58:45:28.0\t15.73\n\nMaximum of afterglow brightness of R=18.50 +/- 0.08 was detected at \n0.00468 days after GRB trigger. It is also interesting a sharp drop at \n~0.85 days (confirmed by observations reported by Kelemen (GCN 15727)) \nwhich could be related to a jet break observed in XRT light curve (see \nhttp://www.swift.ac.uk/xrt_live_cat/00583338/).",
  "circularId": 15744,
  "createdOn": 1389807422000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 140108A: Mondy optical observations, refined analysis",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 140108A"
}