[vsnet-grb-info 23943] GRB 191019A: GROND observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26042
SUBJECT: GRB 191019A: GROND observations
DATE:    19/10/20 13:43:49 GMT
FROM:    Ana Nicuesa at TLS Tautenburg  <ana at tls-tautenburg.de>

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