TITLE: GCN CIRCULAR NUMBER: 10623 SUBJECT: GRB 100413A: GMRT observation of radio afterglow DATE: 10/04/19 13:59:21 GMT FROM: Sayan Chakraborti at TIFR,Mumbai,India Sayan Chakraborti, Naveen Yadav and Alak Ray (Tata Institute of Fundamental Research, Mumbai, India) report: We observed the optically dark GRB 100413A, whose radio afterglow has been detected by the EVLA at 8.5 GHz (Frail et al, GCN 10611), with the Giant Metrewave Radio Telescope (GMRT) on April 19.1 UT. We do not find, any source at its position, at the observing frequency of 1.28 GHz, down to the 3 sigma upper limit of 124 uJy. We thank the staff of the GMRT that made this observation possible. GMRT is run by the National Centre for Radio Astrophysics of the Tata Institute of Fundamental Research.