GCN Circular 33340
Subject
GRB 230216A: SVOM/C-GFT optical upper limit
Date
2023-02-18T04:38:35Z (a year ago)
From
Chao Wu at NAOC <wuchao.lamost@gmail.com>
Zhe Kang (CHO), Liping Xin (NAOC), Chao Wu (NAOC), Xuhui Han (NAOC),
Xiaomeng Lu (NAOC), Damien Turpin(CEA), Zhenwei Li (CHO)���Pinpin Zhang
(NAOC)���Ruosong Zhang (NAOC)���Yulei Qiu (NAOC)���You Lv (CHO)���Jing Wang(GXU),
Cordier Bertrand (CEA) and Jianyan Wei (NAOC) on behalf of SVOM GRB team
We observed the burst GRB230216A (Klingler et al. GCN Circ. 33328) on
14:50:01 UT, Feb. 16th, 2023, about 87 seconds after the Swift trigger
with C-GFT (Chinese Ground Follow-up Telescope in SVOM mission) in System
Test Mode (STM). C-GFT is located at Jilin (long.=126.33 deg, lat.=
43.8243778 deg), Changchun Observatory, National Astronomical
Observatories, CAS. It has FOV of 1.5 deg X 1.5 deg with a 4k*4k CMOS
detector mounted on the primary focus of 1.2-meter-aperure telescope.
A series of g and r band images were obtained. The exposure time was 10-30
seconds for each frame.
The bright star USNO-B1 0819-0175793 is located within the XRT enhanced
error box (Osborne et al., GCN 33331) which has been reported (Gendre et
al.,GCN 33329; Mohammad Odeh GCN 33330). No optical afterglow was detected
with an image subtraction by the first r band image with an image obtained
43 minutes after. A limit magnitude of 18.5 mag is derived for r-band
single frame (in STM) after calibration with nearby UCAC 4 catalogs.
More detailed analysis is continuing.
We thank the observation assistant Bowen Li at Jilin observatory for their
excellent support.
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