TITLE:   GCN CIRCULAR
NUMBER:  17708
SUBJECT: GRB 150413A: AMI 15 GHz detection of possible radio counterpart
DATE:    15/04/15 17:47:38 GMT
FROM:    Alexander van der Horst at George Washington U  <ajvanderhorst@gwu.edu>

G.E. Anderson, R.P. Fender, T.D. Staley, K. Mooley (University of Oxford),
A.J. van der Horst (George Washington University), A. Rowlinson (CASS)

We observed the position of GRB 150413A (Markwardt et al., GCN 17688)
at 15 GHz with the Arcminute Microkelvin Imager (AMI-LA) starting on
2015 April 14.745 to 14.973 UT, corresponding to 1.2 days post-burst.
On this date we possibly detected a radio source coincident with the
MASTER’s optical position (Ivanov et al., GCN 17689) with a preliminary
flux of 0.19 +/- 0.04 mJy. There are no catalogued radio sources at this 
position.

An earlier observation was conducted on 2015 April 13.747 to 13.914 UT,
corresponding to 0.2 days post-burst, yielding a 3 sigma flux upper limit
of 0.15 mJy.

Further AMI monitoring is planned. We thank the AMI staff for scheduling 
these observations.