TITLE: GCN CIRCULAR NUMBER: 13152 SUBJECT: GRB 120327A: NOT optical observations DATE: 12/03/28 05:38:24 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst Daniele Malesani (DARK/NBI), Johan P. U. Fynbo (DARK/NBI), Pall Jakobsson (Univ. Iceland), Jens Jessen-Hansen (NOT and Univ. Aarhus), Jyri Lehtinen (NOT and Univ. Helsinki), report: We observed the optical afterglow of GRB 120327A (Sbarufatti et al., GCN 13123) with the NOT equipped with ALFOSC in imaging mode. Observations were carried out in the R band, for a total exposure time of 30 min, with a seeing of 1.2". The optical afterglow is well detected in our images taken at a mean epoch of March 28.164 UT (1.05 days after the GRB), with a magnitude R = 21.8+-0.16 calibrated against nearby USNO-B1 stars (R1 magnitudes). This value is in fair agreement with the extrapolation of the R-band data reported in the literature (LaCluyze et al., GCN 13127; Klotz et al., GCNs 13124, 13132; Sudilovsky et al., GCN 13129; Gorosabel et al., GCN 13130; Im et al., GCN 13140; Meehan et al., GCN 13144). The afterglow has faded following a single power-law decay with slope alpha = 1.3 between 12 min and 1 day after the GRB, though small-scale variability may be present (see also LaCluyze et al., GCN 13127).