TITLE: GCN CIRCULAR NUMBER: 34903 SUBJECT: GRID detection of GRB 231020A DATE: 23/10/29 11:39:09 GMT FROM: GRID Student Team at Tsinghua University Chenyu Wang and Zirui Yang report on behalf of the GRID Collaboration: The long-duration GRB 231020A (Fermi/GBM detection: GCN Circular 34856, AstroSat CZTI detection: GCN Circular 34880) was also detected with GRID-04. The event was triggered by GRID on 2023-10-20 at 18:56:58 UTC. The measured burst duration (T90) in the 30-2000 keV range is approximately 9.8 +/- 2.0 s seconds. GRID is a student-led project to monitor the transient gamma-ray sky with multiple detectors onboard different nanosatellites in the era of multi-messenger astronomy. For more information about GRID, please refer to the following references: https://doi.org/10.1007/s10686-019-09636-w and https://doi.org/10.1007/s10686-021-09819-4.