GCN Circular 23839
A. Cucchiara (U. of the Virgin Islands) reports on behalf of a larger collaboration: We observed Swift GRB 190202A (Tohuvavohu et al. GCN 23803) with the LCO 1-m units at CTIO on January 2, from 06:49 to 07:40 UT (corresponding to 0.2 to 0.25 hours from the GRB trigger time) with the SDSS r' and i' filters. We performed a series of 10x120s in both filters and we clearly detect the optical afterglow (Novichonok et al. GCN 23831) with the following magnitudes: r' = 19.57 +- 0.04 i' = 19.19 +- 0.05 These magnitude are calibrated against several SDSS objects near the GRB location and are not corrected for Galactic Extinction. These observations were possible thanks to the USVI NASA-EPSCoR Research Infrastructure Development (RID) grant NNX16AL44A.