TITLE: GCN CIRCULAR NUMBER: 30842 SUBJECT: GRB 210812A is not a compelling example of a lensed GRB DATE: 21/09/15 23:50:45 GMT FROM: Robert Nemiroff at Michigan Tech. <nemiroff@mtu.edu> Oindabi Mukherjee (Michigan Tech U.) & Robert J. Nemiroff (Michigan Tech U.) report: A preliminary light curve and hardness comparison between the two main pulses of GRB 210812A has been done using Fermi GBM data to test for gravitational lensing (as suggested by Veres et al. 2021, GCN 30645). First, an amplitude-equalized light curve comparison of combined energy bands 3 through 7 in detectors 2, 7, 8, 9, 10, 11, and 12 shows a chi^2 difference of 2.796 sigma, so that there is only a 0.52% chance of the two pulses being randomly drawn from the same pulse. Additionally, a hardness analysis shows that in energy channels 4 and 5, the hardness difference between the two pulses differs at the 2.24 sigma level, with the second pulse being softer. These preliminary results suggest that although the case of GRB 210812A is interesting, it is not a compelling example of a GRB gravitational lens. A more thorough analysis is ongoing.