TITLE: GCN CIRCULAR NUMBER: 39353 SUBJECT: GRANDMA/OPD observations of GRB250215A DATE: 25/02/17 12:20:03 GMT FROM: Nidhal Guessoum at AUS, UAE nguessoum@aus.edu
Leandro de Almeida (LNA), Nélio Sasaki (UEA-Parintins), Wagner Corradi (LNA), Felipe Navarete (LNA), Martin Masek (FZU), Nuha Manal Pattani (AUS), Shaikha Alshamsi (AUS), S. Antier (OCA/IJCLAB), P. Hello (IJCLAB), N. Guessoum (AUS), C. Andrade, M. Coughlin (UMN), P-A Duverne (APC), S. Karpov (FZU), T. Pradier (Unistra/IPHC), and D. Turpin (CEA-Saclay/Irfu), on behalf of Observatório do Pico dos Dias (OPD/LNA/Brazil) and the GRANDMA collaboration, began observations of GRB 250215A, initially detected by the Fermi GBM Team (GCN 39327).
Based on the coordinates of the field center (RA=10:25:19.48, DEC=-27:41:54.00), we obtained 12 frames of 300 seconds each using the 0.6m telescope of OPD, starting on 2025-02-16 at 02:30:42.23 and ending at 07:43:29.39 UTC. The FOV of the stacked image is 10.5x10.5 arcmin with a pixel scale of 0.614 arcsec/pixel.
We did not detect any candidate in our stacked images with an upper limit of I > 21.34 mag at 5-sigma, calibrated against several stars of the I/339 catalog (HSOY, Altmann et al, 2017).
Our non-detection upper limit is similar to the results of Ducoin et al. (GCN 39344) with nothing brighter than 22.7 mag detected in r. Our results are also in slight discrepancy with the findings of Malesani et al. (GCN 39341).
GRANDMA is a worldwide telescope network (http://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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