TITLE: GCN CIRCULAR NUMBER: 35414 SUBJECT: IceCube-231211A: GRANDMA observations of PKS2047+098 DATE: 23/12/22 17:06:57 GMT FROM: Thierry Pradier at IPHC/University of Strasbourg tpradier@km3net.de

M. Prouza, S. Karpov, M. Mašek (FZU), C. Andrade (UMN), S. Antier (OCA/Artemis), M. Coughlin (UMN), P.A. Duverne (APC), P. Hello (IJCLAB), I. Tosta e Melo (UniCT-DFA), T. Pradier (Unistra/IPHC), D. Turpin (CEA), report on behalf of the GRANDMA collaboration:

We observed the field of PKS2047+098 after the detection of 2 IceCube high-energy neutrino candidates (GCN 35328, 35332), and the report of an increased gamma-ray activity for this Blazar by Fermi-LAT (GCN 35329). Master-Net reported upper limits for the considered errorbox soon after the IceCube alert (GCN 35321).

Imaging with FRAM-CTA-N telescope of the GRANDMA collaboration in the r- and v-bands, we obtained R > 18.3 and V > 18.6 (5 sigma) on 2023-12-14T20:11:42 and 2023-12-14T20:13:20 with 19x90s exposure.

Followup will continue in the forthcoming weeks.

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).

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