GRB 240821A: GRANDMA/LesMakes-T60 Upper Limit
Abstract
We imaged the field of GRB 240821A detected by SVOM/ECLAIRs (GCN 37220) and Fermi-GBM (GCN 37219) with LesMakes-T60 at La Réunion. The observations started ~1.4 hours after the GRB trigger (in Sloan r) and finished 1 hour later. Proximity to the moon made the limits relatively shallow. The data have been reduced by a single data processing pipeline STDPIPE (Karpov et al., 2022). We do not find any optical counterpart within the ECLAIRs localization error box (7 arcmin centered on RA, Dec = 354.23, -10.18 (J2000)). We estimate an upper limit of 18.4 mag in r-band (5 sigma). We thank SVOM for the useful communication. We use the SkyPortal application (skyportal.io) to monitor our observational campaign. 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 49, 5518).
- Publication:
-
GRB Coordinates Network
- Pub Date:
- August 2024
- Bibcode:
- 2024GCN.37225....1K