TITLE:   GCN CIRCULAR
NUMBER:  24877
SUBJECT: Swift trigger 911102: D50 optical limit
DATE:    19/06/24 21:25:10 GMT
FROM:    Martin Jelinek at Astro.Inst-AVCR,Ondrejov  <martin.jelinek@asu.cas.cz>

Martin Jelinek, Jan Strobl (ASU CAS Ondrejov, CZ)
report:

The 50 cm robotic telescope (D50) of Ondrejov
observatory in the Czech republic reacted robotically to
the Swift trigger n. 911102 (Cenko et al, GCNC 24876),
obtaining a series of 10 s unfiltered images starting at
20:42:42UT, i.e. 122 s post trigger.

We do not detect any new source in comparison to
USNO-B1.0 catalog neither in single images (3-sigma limit
R>~16.6) nor in a combined 18x10s frame (mean exp time
218 s post trigger, 3-sigma limit R>~18.2).