{
  "bibcode": "2022GCN.31467....1F",
  "body": "S.Y. Fu (NAOC), Z.P. Zhu (NAOC,HUST), X. Liu, S.Q. Jiang, D. Xu (NAOC), \nX. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:\n\nWe observed the field of GRB 220117A detected by Swift (Melandri et al., \nGCN 31466) using the NEXT-0.6m telescope located at Nanshan, Xinjiang, \nChina. Observations automatically started at 16:21:57 UT on 2022-01-17 \n(i.e., 186 s after the BAT trigger), and a series of 40 s, 60 s, 90 s, \n200 s frames were obtained in the Sloan r- and z- filters.\n\nNo uncatalogued optical transient is detected in our stacked images at \nthe Swift-XRT position (GCN 31466), down to limiting magnitudes of \nr~19.6 and z~18.7, calibrated with the nearby PanSTARRS field.\n\nNevertheless, we note that from PanSTARRS there exists a source at the \nborder of the Swift-XRT error circle at coordinates R.A. (J2000) = \n6:06:17.32 and Dec. (J2000) = -28:26:13.07, which has magnitudes of g \n~21.51, r~21.05, i~20.99, and z~21.02, rasing the possibility as the \nhost galaxy of the GRB. This sky area is not covered by SDSS and Legacy \nSurvey. SkyMapper covered the sky area with upper limits of r~19.0 and \nz~19.0, comparable to the NEXT's level. It is thus unclear if the \nPanSTARRS source is related to the GRB or not.",
  "circularId": 31467,
  "createdOn": 1642445470000,
  "email": "dxu@nao.cas.cn",
  "subject": "GRB 220117A: Nanshan/NEXT optical observations and a nearby PanSTARRS source",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "GRB 220117A"
}