TITLE:   GCN CIRCULAR
NUMBER:  22637
SUBJECT: GRB 180411A: Tautenburg observations
DATE:    18/04/12 09:04:07 GMT
FROM:    Sylvio Klose at TLS Tautenburg  <klose@tls-tautenburg.de>

B. Stecklum, S. Klose, and C. Hoegner (Thueringer Landessternwarte 
Tautenburg) report:

We imaged the field of GRB 180411A (Liu et al., GCN 22630) in the Rc band 
using the Tautenburg Schmidt telescope equipped with the prime focus CCD 
camera. Observations started at 19:49 UT, about 7.5 hr after the burst.

Inside the XRT error circle (radius 3.5 arcsec; Gibson et al., GCN 22632) 
we do not find any source. At a mean time of 19:53 UT we constrain the 
magnitude of any optical transient to R>22 mag.