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 19944

GRB 160925A: Optical spectroscopy of MASTER optical transient
2016-09-27T08:53:03Z (8 years ago)
Cristiano Guidorzi at Ferrara U,Italy <>
I.A.Steele (LJMU), C. Guidorzi (U. Ferrara), C. G. Mundell (Bath), A. Gomboc (U. Nova Gorica), J. Japelj (INAF-OAT) report on behalf of a larger collaboration.

We report optical spectroscopy of the MASTER optical transient (GCN 19938, 19939, 19941) which is a possible optical counterpart to the FERMI GBM trigger 496473540 (GRB160925A).

The optical transient has the ID MASTER OT J222817.90-145657.4.

A low resolution (R~350) optical (400-800nm) spectrum was obtained using the SPRAT spectrograph of the Liverpool Telescope (La Palma) on 26-09-16 at  21:25:49 UT. The 300 second exposure shows a strong, blue continuum with clear H-beta and H-gamma absorption lines at zero redshift. H-alpha is not  present either in emission or absorption (implying a degree of H-alpha emission).  The spectrum is consistent with a dwarf nova during outburst and therefore not likely to be associated with the Fermi trigger.
Looking for U.S. government information and services? Visit