GCN Circular 38543
Subject
GRB 241209B: GRANDMA/TRT upper limit
Date
2024-12-12T15:00:34Z (a month ago)
From
marion.pillas@ligo.org
Via
Web form
M. Pillas (ULiege), M. Tanasan, K. Noysena (NARIT), S. Antier (OCA), O. Pyshna (Caltech), N. Guessoum (AUS), A. Klotz (IRAP), C. Andrade (UMN) S. Karpov (FZU), M. Coughlin (UMN), , P. Hello (IJCLAB), P-A Duverne (APC), T. Pradier (Unistra/IPHC), D.Turpin (CEA-Saclay/Irfu), on behalf of the GRANDMA collaboration:
We observed the field of GRB 241209B, detected by SVOM/ECLAIRs and GRM (GCN 38478) using TRT-SRO. Observations began 0.209 days after ECLAIRs T0.
We didn't detect any optical afterglow candidate with an upper limit of 22 mag in Johnson-R (3 sigma, Vega Mag)
Further analysis is required to check consistency with the afterglow candidate of SVOM/VT (GCN 38516).
All the data have been reduced by a single data processing pipeline, STDPipe (Karpov et al., 2022).
GRANDMA is a worldwide telescope network (grandma.ijclab.in2p3.fr) devoted to the observation of transients in the context of multi-messenger astrophysics (Antier et al. 2020 MNRAS 497, 5518). Kilonova-Catcher (KNC) is the citizen science program of GRANDMA (http://kilonovacatcher.in2p3.fr/).