{
  "bibcode": "2017GCN.21957....1T",
  "body": "H.J. Tan (CCU), H.X. Feng, D. Xu, Z.P. Zhu (NAOC), Y.D. Hu (IAA-CSIC), \nY. Qin (Geneva Obs.), X. Gao (Urumqi No.1 Senior High School) report:\n\nWe observed the field of GRB 171001A (Lien et al., GCN 21946) using the \n0.36m robotic telescope located at Nanshan, Xinjiang, China. \nObservations started at 18:37:21 UT on 2017-10-01, i.e, 701 sec after \nthe BAT trigger, and all imaged were taken without filter.\n\nThe optical afterglow was detected at the XRT position (Evans et al., \nGCN 21952) with coordinates\n\nR.A. (J2000) = 01:28:18.67\nDec. (J2000) = -11:53:39.0\n\nwith an uncertainty of ~0.5 arcsec.\n\nOur photometry was summarized as follows:\n========================================\nTmid(s)+T0   Exptime(s)       Mag(R)           MagErr\n\n741                40*2            >17.60\n\n902                60*2              17.93              0.13\n\n1102              60*3              18.00              0.11\n\n1328              90*2              18.55              0.11\n\n1522              90*2              18.60              0.20\n\n3327              90*8             >18.75\n========================================\nNote: (1) Photometry is calibrated with stars in the USNO B1 catalogue \nin the R-filter, although images were taken without filter. (2) MagErr \nis the only statistical error of the measurement. (3) The magnitudes are \nnot corrected for the Galactic extinction.",
  "circularId": 21957,
  "createdOn": 1506946869000,
  "email": "dxu@nao.cas.cn",
  "subject": "GRB 171001A: Nanshan-0.36m optical afterglow detections",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "GRB 171001A"
}