TITLE:   GCN CIRCULAR
NUMBER:  13937
SUBJECT: GRB 121027A: sub-mm upper limit
DATE:    12/11/01 15:32:19 GMT
FROM:    Jochen Greiner at MPI  <jcg@mpe.mpg.de>

J. Greiner (MPE Garching), A. Belloche, T. Csengeri, F. Wyrowski 
(all MPIfR Bonn), F. Schuller, F. Montenegro (both APEX, ESO), 
V. Sudilovsky, J. Elliott (both MPE Garching), 
D. A. Kann (MPE Garching/Universe Cluster),
A. de Ugarte Postigo (IAA-CSIC Granada/DARK Copenhagen), 
T. Kruehler (DARK Copenhagen) report:

We observed the afterglow of the peculiar GRB 121027A (Starling et al. 2012, 
GCN 13911; Levan et al. 2012, GCN 13920; Evans et al. 2012, GCN 13921) with 
LABOCA/APEX at 870 micron. The observations in photometry mode started on 
Oct. 31, 7:57 UT, 4.02 days after the Swift trigger (Evans et al. 2012, 
GCN 13906, Barthelmy  et al. 2012, GCN 13910). They were performed under 
good weather conditions (pwv ~ 1 mm), and lasted for 1 hr.

No source is detected, down to a 3 sigma upper limit of 21 mJy/beam.