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 16182

GRB 140428A: 1.5m OSN I-band detection
2014-04-29T11:34:51Z (10 years ago)
Javier Gorosabel at IAA-CSIC <>
F.J. Aceituno (OSN/IAA-CSIC), A.J. Castro-Tirado (IAA-CSIC/UMA), R.
Sanchez-Ramirez (IAA-CSIC), J. Gorosabel (IAA-CSIC/UPV-EHU), report on
behalf of a larger collaboration:

�We observed the field of GRB 140428A (Kocevski et al., GCN 16177; Page 
et al., GCN 16178) with the 1.5m OSN telescope at Observatorio de Sierra
Nevada. Three 300s images were acquired in the I-band starting on Apr 29,
00:09:39 UT (i.e. ~1.5 hours burst). A preliminary reduction clearly shows
the optical afterglow reported by Perley (GCNC 16180) with a Vega
magnitude of I~20.8. This magnitude must be taken with caution given the
likely presence of the Lyman-alpha break in the I-band filter pass-band.�
Looking for U.S. government information and services? Visit