TITLE: GCN CIRCULAR NUMBER: 26042 SUBJECT: GRB 191019A: GROND observations DATE: 19/10/20 13:43:49 GMT FROM: Ana Nicuesa at TLS Tautenburg A. Nicuesa Guelbenzu (TLS Tautenburg) reports: GROND (Greiner et al. 2008, PASP 120, 405) performed a first visit of the field of GRB 191019A (Swift trigger 930285; Simpson et al., GCN 26031) at 01:35 UT on 2019-10-20, about 10.3 hours after the burst. Observations were performed at an airmass of 1.02 and a seeing of 2.0 arcsec. Second-epoch observations started at 05:10 UT on the same night (airmass 1.75, seeing 1.7 arcsec). The potential afterglow plus host-galaxy complex is clearly detected. Between the 1st and the 2nd-epoch observations there is no evidence for fading in any band (g'r'i'z' as well as in JHKs). The GROND r'(AB = 19.14 +/- 0.01) and i' (AB = 18.73 +/- 0.01) magnitudes are in agreement with the NOT observations and the Pan-STARRS catalog (Perley et al., GCN 26039; Fynbo et al., GCN 26041). I acknowledge the excellent support from Sam Kim on La Silla in acquiring these observations