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GCN Circular 33616

Subject
GRB 230414B: Nanshan/HMT optical afterglow detection
Date
2023-04-14T17:26:09Z (10 months ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
T.H. Lu (NAOC), Z.P. Zhu (NAOC, HUST), S.Y. Fu, S.Q. Jiang, X. Liu, D. 
Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:

We observed the field of GRB 230414B detected by Swift (A. D'Ai et al., 
GCN 33612) using the HMT-0.5m telescope located at Nanshan, Xinjiang, 
China. Observations started at 16:19:34 UT on 2023-04-14, i.e., 313s 
after the Swift/BAT trigger, and a series of 20 s, 40 s, 60 s, 90 s 
exposures have been obtained without any filter. Observations are still 
ongoing.

We detected an uncatalogued and varying optical transient (OT) at 
coordinates

R.A. (J2000) = 12:04:22.70
Dec.(J2000) = +53:09:16.38

with an uncertainty of ~ 0.5 arcsec, and it has m(r) ~19.3 mag in the 
co-added image from the initial exposures, calibrated with the nearby 
PanSTAR field in the Sloan r-filter. We thus think that the OT is the 
optical afterglow of the burst.
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