TITLE: GCN CIRCULAR NUMBER: 11459 SUBJECT: Request for Supernova related data for GRB 101023A DATE: 10/12/18 10:03:22 GMT FROM: Sandip K. Chakrabarti at S.N. Bose Nat. Centre for Basic Sci. R. Ruffini, L. Izzo, A. Penacchione, S.K. Chakrabarti on behalf of ICRAnet reports: We have tentatively identified the redshift factor z of GRB 101023A (GCN 11363, 11364, 11365, 11366) to be between 0.7 to 1.0 from Amati relation. This GRB had two major pulses whose E_iso appear to be ~10^52 ergs and ~2x10^53 ergs respectively. Despite being bright and nearby, no Supernovae has been reported for this source. We encourage anyone having data especially around 1st to 7th of November, 2010, on this object on supernovae association (either way) to report them to facilitate understanding this object.