TITLE: GCN CIRCULAR NUMBER: 19388 SUBJECT: GRB 160504A: Bassano Bresciano Observatory upper limits DATE: 16/05/05 07:52:39 GMT FROM: Ulisse Quadri at Bassano Bresciano Obs U.Quadri, L.Strabla and R.Girelli report: We imaged the field of GRB 160504A detected by SWIFT(trigger 685124) 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 22.45 min after the GRB trigger, with our Schmidt telescope D=320/400 mm F/D=3.1. Weather conditions were good. We co-added 2 series of 20 exposures of 120 sec each. Start T0+ End T0+ Vlim 22.45 min 111.33 min 20 We did not found any optical counterpart in the error box of the XRTcandidate. (D. Malesani (DARK/NBI), 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.