TITLE: GCN CIRCULAR NUMBER: 10921 SUBJECT: GRB 100702A: Second epoch of Magellan near-IR observations and afterglow limits DATE: 10/07/02 13:26:12 GMT FROM: Edo Berger at Harvard E. Berger, W. Fong, and M. Servillat (Harvard) report: "We re-observed the location of the short GRB 100702A (GCN 10916) with the PANIC infrared imager on the Magellan/Baade 6.5-m telescope starting on 2010 July 2.290 UT (4.8 hours after our first observation, which started 65 min after the burst; GCN 10919). A total of 27 min were obtained in the J-band with slightly worse seeing than in our first epoch, 0.75 arcsec. Digital image subtraction of the two epochs using the ISIS package reveals no change in the flux of our previously-identified sources S1 (source "B" of Malesani et al. GCN 100918), S2, or S3. No other variable sources are detected within a 45x45 arcsec region centered on the XRT position to a 5-sigma limit of J>22.1 mag (Vega). We note, however, that the bright star at RA = 16:22:47.01, DEC = -56:31:53.5 (designated source "A" in GCN 10918) strongly contaminates the subtracted image over about 1/4 of the XRT error circle."