GRB 210222B: FRAM-ORM afterglow detection
Abstract
The 25cm robotic telescope FRAM-ORM at La Palma (Spain) reacted robotically to the alert of GRB210222B (Gropp et al. GCNC 29545, Marrocchesi et al. GCNC 29553), obtaining a series of 20 s unfiltered images starting at 22:38:21.1 UT, i.e. 55.1s post trigger. We clearly detect the source reported by other telescopes (Hu et al. GCNC 29546, Strausbaugh et al. GCNC 29547, Mong et al. GCNC 29548, Perley GCNC 29549, Agui Fernandez et al. GCNC 29552, and Lipunov et al. GCNC 29554). As seen by FRAM, the brightness of the object reached a maximum of about R(Vega) ~ 15.5, similarly to the value of BOOTES, and then slowly changed to a decay with an index alpha = ~1.1. Would the decay stay at this rate, the afterglow may have a brightness of R~22.0 24h post trigger.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- February 2021
- Bibcode:
- 2021GCN.29557....1J