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 22452

GRB 180224A: OASDG optical observations
2018-02-26T10:10:08Z (6 years ago)
Luca Izzo at IAA-CSIC <>
L. Izzo (IAA-CSIC), A. Noschese (AC-OASDG) report:

We observed the field of GRB 180224A (Lien et al. GCN 22442) with the 0.5m telescope of the Osservatorio Astronomico S. Di Giacomo located in Agerola, Italy ( ). 
We obtained a series of 9x180 s images in the Rc filter, starting at 23:33:36 UT, ~ 1.21 hrs after the GRB detection. In our stacked image, we find no source at the position of the observed optical counterpart (Vladimirov  et al. GCN 22444, Watson et al. GCN 22446, Mazaeva et al. GCN 22448) down to a 3-sigma limit of Rc (Vega) > 20.2.  The calibration was performed using nearby stars in the USNO B1 catalog.
Looking for U.S. government information and services? Visit