GRB 221027B: FRAM-ORM and Ondrejov SBT optical limits
Abstract
Report the 2x20cm robotic telescope BART-SBT in Ondrejov (CZ) reacted robotically to the Swift alert of GRB221027B (Lien et al., GCNC 32867 and Perri et al. GCNC 32870, GCNC 29119 and 29124), obtaining a series of 12s unfiltered frames at 19:19:46 UT, i.e. 367s post trigger. The 25cm robotic telescope FRAM-ORM at La Palma (Spain) reacted to the same alert, providing a series of 60s unfiltered images from 19:28:20 UT, i.e. 882s post trigger. Similarly to Hu et al. (GCNC 32869) and Lipunov et al. (GCNC 32871), we do not detect any new or strongly variable source neither in single or in combined frames with the following limits: Tel. T-T0[mid,s] Texp[s] Limit[ABmag] Note SBT 374 12 <15.5 (similar during the following 30 min) SBT 494 240 <17.0 SBT 674 600 <17.3 SBT 1574 2400 <17.7 FRAM 912 60 <17.0 (similar next 60 minutes) FRAM 1238 10x60 <18.0
- Publication:
-
GRB Coordinates Network
- Pub Date:
- October 2022
- Bibcode:
- 2022GCN.32873....1J