TITLE: GCN CIRCULAR NUMBER: 23607 SUBJECT: GRB 190103B: Bassano Bresciano observatory upper limit DATE: 19/01/04 17:41:11 GMT FROM: Ulisse Quadri at Bassano Bresciano Obs U.Quadri, L.Strabla and A.Quadri report: We imaged the field of GRB 190103B detected by SWIFT(trigger 881709) with the robotic telescope of (IAU station 565) Bassano Bresciano Observatory, Italy. Member of: AAVSO - American Association of Variable Star Observers. ISSP - Italian Supernovae Search Project. UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili. The observations started 194.16 min after the GRB trigger,  with our Schmidt telescope D=320/400 mm F/D=3.1. Weather conditions were good. We co-added 64 exposures of 240 sec each. Start T0+      End T0+      Vlim 194.16 min   459.27 min    19.5 We did not found any optical counterpart in the error box of the XRTcandidate. A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), J. A. Kennea (PSU), et al. Magnitudes were estimated with the UCAC4 cat. and are not corrected for galactic dust extinction. Reference: http://www.osservatoriobassano.org/GRB.asp The message may be cited.