[vsnet-grb-info 22589] GRB 190530A: GWAC-F30 optical detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  24688
SUBJECT: GRB 190530A: GWAC-F30 optical detection
DATE:    19/05/31 01:42:46 GMT
FROM:    Liping Xin at NAOC, SVOM  <xlp at nao.cas.cn>

L. P. Xin,  G. W. Li, R. S. Zhang,  T. C. Zheng, J. Wang,   J. Y. Wei,   Y. G. Yang, 
E. W. Liang,  X. G. Wang,   H. L. Li, X. H. Han,  X. M. Lu,  L. Huang,    H. B. Cai,   
Y. L. Qiu,  Y. Xu, Y.  J. Xiao, Y. T. Zheng,  C. Wu,   J. S. Deng,  D. W. Xu, 
D. Turpin, W. L. Dong, P. P. Zhang and Jirong Mao report:

We began to observe GRB 190530A (Fermi-GBM team, GCN 24676 ) with GWAC-F30cm telescope 
at 2019-05-30T12:48:46(UT), about 2.49 hour after the burst. GWAC-F30cm telescope is located at Xinglong
observatory, China. The field of view is about 1.9*1.9 sqr. deg. The coordinates  we used to make the 
observations was derived from  Biltzinger et al., (GCN 24677). Due to the low elevation of this source
at Xinglong observatory,  only seven R-band images were obtained. The exposure time for each frame
was 20 seconds. 

The afterglow was detected by stacking all the images. 
The coordinates is about RA=08:02:07.678  DEC=+35:28:47.14 J2000,
consistent with the position reported by Lipunov et al., GCN 24680. 
The magnitude was R=15.1mag, calibrated by the nearby USNO R2 magnitudes.

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