[vsnet-grb-info 25207] GRB 200303A: FRAM-ORM optical limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  27307
SUBJECT: GRB 200303A: FRAM-ORM optical limit 
DATE:    20/03/03 14:04:46 GMT
FROM:    Martin Jelinek at Astro.Inst-AVCR,Ondrejov  <martin.jelinek at asu.cas.cz>

Martin Jelinek, Jan Strobl (ASU CAS Ondrejov, CZ), Martin Masek, Petr
Janecek, Sergey Karpov, Jakub Jurysek, Jan Ebr, Ronan Cunniffe, Petr
Travnicek and Michael Prouza (Institute of Physics, Prague, CZ)

report:

The 25cm robotic telescope FRAM-ORM at La Palma (Spain) reacted robotically
to the GBM/Swift/CALET alert of GRB200303A (Cenko et al, GCNC 27297, Goad
et al. GCNC 27300, Asaoka et al. GCNC 27301 and Fermi GBM team GCNC 27294),
obtaining a series of 20s unfiltered images starting at 02:35:38.75UT, i.e.
41.3s post trigger.

We do not detect any new source in comparison to USNO-B2.0 catalog neither
in single images (3-sigma limit R>~17.9) nor in a combined 20x20s frame
(mean exp time 289s post trigger, 3-sigma limit R>~19.5) similarly to de
Ugarte et al. (GCNC 27303) and Mong et al. (GCNC 27304)