{
  "bibcode": "2021GCN.29310....1Z",
  "body": "Z.P. Zhu (NAOC, HUST), J. P. U. Fynbo (DAWN/NBI), D. A. Perley (LJMU), \nS.Y. Fu, D. Xu (NAOC) report on behalf of a larger collaboration:\n\nWe observed the field of ZTF21aaeyldq/AT2021any (Ho et al., GCN 29305) \nusing the 2.56-m Nordic Optical Telescope (NOT) equipped with the ALFOSC \ncamera. We did photometry in the Sloan g-/r-/i- filters, and the source, \npresumably an orphan GRB afterglow (e.g., A. de Ugarte Postigo et al., \nGCN 29307), is clearly detected in each of our images.\n\nPreliminary photometry of the source is as follows:\n\nT_start(UT)         Tmid-T0(day) Exptime(s) Filter    Mag     MagErr\n2021-01-17T02:18:24     0.812    5x300    sdss-g   22.28     0.05\n2021-01-17T02:45:53     0.831    5x300    sdss-r    21.86     0.04\n2021-01-17T03:13:26     0.850    5x300    sdss-i    21.65     0.03\n\nT0 is 06:59:45.6 UT on 2021-01-16, first ZTF detection of ZTF21aaeyldq, \nand calibrated with nearby Pan-STARRS stars.",
  "circularId": 29310,
  "createdOn": 1610890667000,
  "email": "dxu@nao.cas.cn",
  "subject": "ZTF21aaeyldq: NOT optical observations",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "ZTF21aaeyldq"
}