TITLE: GCN CIRCULAR NUMBER: 41932 SUBJECT: GRB 250920B: Asiago optical observations DATE: 25/09/21 17:57:22 GMT FROM: Daniele Bjørn Malesani at Cosmic Dawn Center, Niels Bohr Institute <daniele.malesani@nbi.ku.dk> A. Reguitti (INAF/OAPd), L. Tomasella (INAF/OAPd), D. B. Malesani (DAWN/NBI and Radboud) report on behalf of a larger collaboration: We observed the field of GRB 250920B (Gupta et al., GCN 41898; Sonawane & Meegan, GCN 41919) using the 67/92 Schmidt Telescope located at the Asiago observatory (Italy). Observations were carried out using a clear filter, which covers roughly the r and i bands. The optical counterpart (Gupta et al., GCN 41898; Wu et al., GCN 41908; Hall et al., GCN 41914; Kuin & Gupta, GCN 41915) is well detected in our frames. At a mean epoch 2025 Sep 20.771 UT (9.74 hr after the GRB), we measure an AB magnitude r = 18.62 +- 0.06 (calibrated directly against r-band magnitudes from the Pan-STARRS catalog). Considering the filter difference, our measurement is consistent with the nearly simultaneous observation by Hall et al. (GCN 41914). View this GCN Circular online at https://gcn.nasa.gov/circulars/41932. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...