GCN Circular 21708
K. De (Caltech), K. P. Mooley (Oxford), P. Chandra (NCRA), V. Bhalerao (IIT-B), A. Corsi (TTU), D. Kaplan (UWM), G. Hallinan (Caltech) and M. M. Kasliwal (Caltech) report on behalf of the GROWTH (Global Relay of Observatories Watching Transients Happen) collaboration We report on continued follow-up observations of SSS17a (GCN 21529; Coulter et al.) with the upgraded Giant Metrewave Radio Telescope (uGMRT) following the first epoch at 610 MHz (GCN 21603; De et al.). Observations were carried out on UT 20 August 2017 08:00 at 400 MHz (200 MHz bandwidth) for an on-source time of ~ 1 hour and on UT 20 August 2017 11:00 at 1.4 GHz (400 MHz bandwidth) for an on-source time of ~ 2 hours. After a preliminary analysis, no emission is detected at the location of the optical transient at 1.4 GHz up to a 3 sigma upper limit of 100 microJy. The transient was also undetected at 400 MHz, although this observation was partially affected by RFI and the analysis is being improved. Further multi-frequency observations are planned. We thank the GMRT staff for prompt scheduling of these observations. The GMRT is run by the National Center for Radio Astrophysics of the Tata Institute of Fundamental Research.