GCN Circular 21311
A. Cucchiara (U. of the Virgin Islands) reports on behalf of a larger collaboration: "On July 10.17UT we imaged the field of GRB 170710A (Evans et al. GCN 21308, 21309, Osborne et al. GCN 21310) with the Gemini-South Telescope equipped with the GMOS camera. We obtained 4x900s spectra covering the 5660-10300 Angstrom wavelength range. In our single 180 seconds acquisition image in i' band centered on the Swift-XRT position we identified an uncatalogued point-like sources at the edge of the refined position: RA= +15:27:16.87 Dec= -38:29:06.0 Using nearby USNO-B1 stars for calibration, we measure a magnitude of i' = 21.13 +/- 0.05. At this point it is not possible to assess the variability of this possible counterpart. Preliminary analysis of the spectra reveals a faint trace clearly visible down to the blue end of the spectrum. No clear absorption or emission features are evident, but more detailed analysis of the data is in progress. We thank the Gemini staff for the prompt response, in particular Veronica Firpo."