TITLE:   GCN CIRCULAR
NUMBER:  22939
SUBJECT: GRB 180709A: BOOTES-5/JGT optical observations
DATE:    18/07/09 21:54:44 GMT
FROM:    Irene Carrasco at Inst.De Astrofisica de Andalucia  <irene@iaa.es>

I. Carrasco (Univ. de Malaga), Y. Hu, E. Fernandez-Garcia, J. C. Tello 
and A. J. Castro-Tirado (IAA-CSIC), D. Hiriart and
W. H. Lee (UNAM), S. Jeong and I. H. Park (SKKU), M. D. Caballero-Garcia 
(ASU-CAS, CZ) and R. Cunniffe (Inst. of Physics, CZ) on behalf of a 
larger collaboration, report:

The 60 cm BOOTES-5/JGT at Observatorio Astronomico Nacional in San Pedro 
Martir (Mexico) automatically responded in 21s (and 74s after the GRB 
onset) to the Swift trigger of GRB 180709A (Marshall et al., GCN  
22930). The first unfiltered images (10 s exposures) were obtained at 
10:53:14 UT. At the position of the Swift X-ray afterglow, no optical 
afterglow is detected down 18.1 mag. Furthermore, on the co-add of the 
images obtained until 11:43:04 UT no afterglow is detected down to 21 
mag, consistent with the limits reported by Butler et al. (GCN 22934), 
Halpern (GCN 22935) and Breeveld et al. GCN 22937).

We thank the staff at Observatorio Astronomico Nacional in San Pedro 
Martir for its excellent support.