Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 15547

GRB 131128A: GROND observations of the afterglow
2013-11-29T14:41:34Z (10 years ago)
Sylvio Klose at TLS Tautenburg <>
S. Schmidl, S. Klose, A. Nicuesa Guelbenzu (TLS Tautenburg), and J. 
Greiner (MPE Garching) report:

We observed the field of GRB 131128A (Swift trigger 579683; Sonbas et al., 
GCN 15533) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, 
PASP 120, 405) mounted at the 2.2m MPG telescope at ESO La Silla 
Observatory (Chile).

Observations started at 00:27 UT on November 29, about 9.5 hrs after the 
GRB trigger and were performed under moderate seeing conditions (1.6") and 
moderate airmass (2.3). For the optical afterglow discovered by Xu et al. 
(GCN 15535, 15537) we measure

RA, DEC (J2000) = 23:41:13.795, +31:18:22.32 (+/- 0.2"),


r'(AB) = 22.6 +/- 0.1,

calibrated against SDSS field stars (mean time 01:12 UT). Photometry in 
the other GROND bands is affected by a bright star very close to the 
afterglow. It might be improved once second-epoch data are obtained.
Looking for U.S. government information and services? Visit