TITLE: GCN CIRCULAR NUMBER: 39341 SUBJECT: EP250215a / GRB 250215A : NOT optical observations DATE: 25/02/16 03:06:15 GMT FROM: Daniele B. Malesani at IMAPP / Radboud University d.malesani@astro.ru.nl
D. B. Malesani (DAWN/NBI and Radboud Univ), D. Xu (NAOC), N. Pyykkinen (NOT and Turku Univ.), M. A. Diaz Teodori (NOT and Turku Univ.) report on behalf of a larger collaboration:
We observed the optical counterpart (Liu et al., GCN 39330; Xie et al., GCN 39333; Malesani et al., GCN 39339) of EP250215a / GRB 250215A (Wang et al., GCN 39329; Fermi GBM Team, GCN 39327; Barria et al., GCN 39331; Tembhurnikar et al., GCN 39334; Zheng et al., GCN 39335) using the ALFOSC instrument installed on the Nordic Optical Telescope (NOT). Observations were carried out in the i band and consisted of 5x300 s exposures, with a mean epoch 2025 Feb 16.076 UT (23.29 hr after the trigger).
The afterglow is well detected with a magnitude i = 21.34 +- 0.07 AB, calibrated against several stars from the Pan-STARRS catalog.
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