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GCN Circular 33761

Subject

GRB 230510A: Nanshan/NEXT optical afterglow detection

Date

2023-05-11T03:06:34Z (a year ago)

From

Dong Xu at NAOC/CAS <dxu@nao.cas.cn>

S.Q. Jiang, T.H. Lu, S.Y. Fu, X. Liu, D. Xu (NAOC), Z.P. Zhu (NAOC, HUST), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:

We observed the field of GRB 230510A detected by Swift (Eyles-Ferris et al., GCN 33752GCN 33752
K.L. Page at U Leicester <klp5@leicester.ac.uk>
GRB 230510A: Swift detection of a burst
) and Fermi (Fermi GBM team, GCN 33751GCN 33751
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
GRB 230510A: Fermi GBM Final Real-time Localization
) using the NEXT-0.6m telescope located at Nanshan, Xinjiang, China. Observations started at 18:47:49.1 UT on 2023-05-10, i.e., 6.69 hr after the Swift/BAT trigger, and 12x200 s exposures have been obtained in the Sloan r-filter.

We detected an uncatalogued optical transient (OT) within the enhanced Swift/XRT error circle (Evans et al., GCN 33756GCN 33756
Phil Evans at U of Leicester <pae9@star.le.ac.uk>
GRB 230510A: Enhanced Swift-XRT position
) at coordinates

R.A. (J2000) = 21:12:32.87
Dec.(J2000) = +34:26:35:59

with an uncertainty of ~ 0.5 arcsec, and it has m(r) = 20.5 +/- 0.1 mag in the co-added image at 7.27 hr post-burst, calibrated with the nearby PanSTAR field. PanSTAR covers this position and is much deeper, but the OT is not present. We thus conclude that the OT is the optical afterglow of the burst.