TITLE:   GCN CIRCULAR
NUMBER:  24567
SUBJECT: GRB 190515B: BOOTES-4/MET and 2.2m CAHA optical limits
DATE:    19/05/17 03:26:28 GMT
FROM:    Alberto J. Castro-Tirado at IAA-CSIC  <ajct@iaa.es>

Y.-D. Hu, X.-Y. Li, E. Fernandez-Garcia, A. Ayala, A. J. Castro-Tirado 
(IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco (Univ. de 
Malaga), S. Guziy (Univ. of Nikolaev), D. Xiong, Y. Fan, X. Zhao, J. 
Bai, C. Wang, Y. Xin, J. Mao (Yunnan Nacional Astronomical Observatory), 
A. Fernandez and I. Hermelo (CAHA),  on behalf of a larger 
collaboration, report:

Following the detection of GRB 190515B by Swift (Moss et al. GCNC 
24553), the 0.6m BOOTES-4/MET robotic telescope at Lijiang Astronomical 
Observatory (China) automatically responded gathering 9 frames (g’ 
filter, 30s exposures) starting at 16:10:44UT (0.11 hr after trigger). 
In addition, 23 frames at the 2.2m Calar Alto telescope equipped with 
CAFOS (I-band, 120s exposures) were taken starting at 20:45:41 UT (4.69 
h post burst). On the co-added images, no optical afterglow is found 
down to 18.9 mag (g-band) or 22.1 (I-band) respectively at the enhaced 
XRT position (Evans et al. GCNC 24554), in agreement with Belkin et al. 
(GCNC 24556) and de Ugarte Postigo et al. (GCNC 24558). Particularly the 
Calar Alto co-add I-band frame does not detect the marginal object 
reported in GCNC 24556.

We thank the CAHA staff for excellent support.