TITLE: GCN CIRCULAR NUMBER: 41011 SUBJECT: GRB 250702F: GRANDMA observations DATE: 25/07/07 16:38:26 GMT FROM: Sarah Antier at OCA sarah.antier@oca.eu
S. Antier (OCA/IJCLAB), S. Karpov (FZU), E. de Bruin (UMN), N. Kochiashivili (AbAO), M. Lamoureux (Uliege), T. Du Laz (Caltech), A. Klotz (IRAP), C. Limonta (OCA) on behalf of GRANDMA:
We observed the field of GRB 250702F (Fermi GBM team, GCN 40892; Klingler et al., GCN 40894) with TAROT and Kilonova catcher (GCN 40969), 1.72 min post T0 and obtained optical counterpart detection.
All our measurements are made public and can be downloaded in order to support the Swift and Fermi/GBM GRB science: https://skyportal-icare.ijclab.in2p3.fr/public/sources/GRB-250702_210643/ver...
All the data have been reduced by a single data processing pipeline, STDPipe (Karpov et al., 2025). Images obtained with the sloan filters were calibrated using the PanSTARRS DR1 catalog. Images obtained with the Johnson-cousins filters were calibrated using the GAIA DR3 synphot catalog.
We use the SkyPortal application (skyportal.io) to monitor our observational campaign (Coughlin et al. 2023).
Our observations are consistent with other already reported (see the Skyportal page) Jelinek et al. (GCN 40895); Kumar et al. (GCN 40896); Lipunov et al. (GCN 40898); Martin-Carrillo et al. (GCN 40900); Angulo et al. (GCN 40907); Becerra et al. (GCN 40911); Brivio et al. (GCN 40913); An et al. (GCN 40916); Dutton et al. (GCN 40921); Odeh et al. (GCN 40925); Moretti et al. (GCN 40926); Siegel et al. (GCN 40933); Ma et al. (GCN 40936); Vinko et al. (GCN 40939); Mohan et al. (GCN 40946); Ciabattari et al. (GCN 40968).
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/). Skyportal/ICARE is supported by ACME.
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