TITLE: GCN CIRCULAR NUMBER: 35439 SUBJECT: GRB 231230A: NOT optical upper limits DATE: 23/12/30 09:03:02 GMT FROM: Zipei Zhu at NAOC zpzhu@nao.cas.cn
Z. Zhu, D. Xu (NAOC) report on behalf a larger collaboration:
We observed the position of GRB 231230A (Moss et al., GCN 35436) using the Nordic Optical Telescope equipped with the ALFOSC images. Observations were carried out with the SDSS r and z filters, with an exposure time of 3x300 s and 5x200 s respectively.
No new objects were dectected in our stacked image within or around the enhanced XRT position (Evans et al., GCN 35437), down to magnitudes r > 23.4 @ T-mid = 4.02 hr and z > 22.7 @ T-mid = 4.32 hr, calibrated with the nearby Pan-STARRS field.
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