GCN Circular 29310
Z.P. Zhu (NAOC, HUST), J. P. U. Fynbo (DAWN/NBI), D. A. Perley (LJMU), S.Y. Fu, D. Xu (NAOC) report on behalf of a larger collaboration: We observed the field of ZTF21aaeyldq/AT2021any (Ho et al., GCN 29305) using the 2.56-m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. We did photometry in the Sloan g-/r-/i- filters, and the source, presumably an orphan GRB afterglow (e.g., A. de Ugarte Postigo et al., GCN 29307), is clearly detected in each of our images. Preliminary photometry of the source is as follows: T_start(UT) Tmid-T0(day) Exptime(s) Filter Mag MagErr 2021-01-17T02:18:24 0.812 5x300 sdss-g 22.28 0.05 2021-01-17T02:45:53 0.831 5x300 sdss-r 21.86 0.04 2021-01-17T03:13:26 0.850 5x300 sdss-i 21.65 0.03 T0 is 06:59:45.6 UT on 2021-01-16, first ZTF detection of ZTF21aaeyldq, and calibrated with nearby Pan-STARRS stars.