TITLE: GCN CIRCULAR NUMBER: 24023 SUBJECT: GRB 190326A: 2.2m CAHA telescope optical limit DATE: 19/03/28 15:59:19 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia Y.-D. Hu, X.-Y.Li, E. Fernandez-Garcia, A. Ayala, A. J. Castro-Tirado (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco (Univ. de Malaga), R. P. Hedrosa and I. Hermelo (CAHA) on behalf of a larger collaboration, report: Following the detection of the short-soft event GRB 190326A by Swift (Siegel et al. GCNC 24009), we triggered the 2.2m telescope (+CAFOS) at the Spanish Calar Alto Observatory (Almeria, Spain). Observations were conducted at high airmass starting on March 28, 04:22:52 UT (i.e. 1.87 day after the trigger). A series of BVRI imaging (500s per filter) shows no optical afterglow down to 21 mag (in the calibrated R-band image) within the Swift/BAT error box (1.6 arcmin, Markwardt et al. GCNC 24020). We acknowledge excellent support from the CAHA staff. This message can be quoted.