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GCN Circular 22058

GROND observations of GRB 171027A: correction
2017-10-27T11:49:56Z (7 years ago)
Patricia Schady at MPE/Swift <>
P. Schady (MPE) reports:

The upper limits reported in GCN #22056 were in fact calibrated against
GROND zeropoints. The 3-sigma upper limits (AB) calibrated against
PanSTARRS are in fact:

g' > 22.2
r' > 22.2
i' > 21.2
z' > 21.0

The reported magnitudes are not corrected for the expected Galactic
foreground extinction corresponding to a reddening of E_(B-V)=0.12 mag in
the direction of the burst (Schlafly & Finkbeiner 2011).
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