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 9456

GRB 090531: GROND upper limits
2009-05-31T08:07:23Z (15 years ago)
Andrea Rossi at TLS Tautenburg <>
A. Rossi (Tautenburg), F. Olivares, and J. Greiner (both MPE Garching)
report on behalf of the GROND team:

We observed the field of GRB 090531 (Swift trigger 353627, Stamatikos et al.,
GCN #9454) simultaneously in g'r'i'z'JHK with GROND mounted at the 2.2m
MPI/ESO telescope at La Silla Observatory (Chile). Observations started on
31 May 2009 at 01:47 UT, 2 minutes after the burst and continued until
03:29 UT.

We do not find any new source within the BAT error circle. Image subtraction
between the first and last images of each band does not reveal any variable
source. The first image , consisting of 4.4 min exposure in g'r'i'z' and
4 min in JHK, yields the following upper limits (all AB):

g' > 22.6
r' > 22.8
i' > 22.4
z' > 22.0
J  > 21.5
H  > 20.9
K  > 20.2

which were obtained using the SDSS and 2MASS field stars as reference.
Looking for U.S. government information and services? Visit