GRB 191228A: ePESSTO+ NTT optical upper limit

We observed GRB 191228A (Bernardini et al., GCN 26601) under the the extended Public ESO Spectroscopic Survey for Transient Objects (ePESSTO+; see Smartt et al. 2015, A&A, 579, 40 http://www.pessto.org ). The observations were performed on the ESO New Technology Telescope at La Silla with the EFOSC2 instrument in imaging mode, starting on 2019 Dec 28 at 01:22:23 UT (i.e. 1.35 hr after the burst). In a 2-minute image taken using the r filter, we detect no objects consistent with the XRT position, down to a 3-sigma limiting magnitude of r = 22.6 AB (calibrated against stars from the Pan-STARRS catalog).