[vsnet-grb-info 10411] GRB 110328A / Swift J164449.3+573451: EVLA observations of a brightening radio source

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11848
SUBJECT: GRB 110328A / Swift J164449.3+573451: EVLA observations of a brightening radio source
DATE:    11/03/30 23:07:49 GMT
FROM:    Edo Berger at Harvard  <eberger at cfa.harvard.edu>

Ashley Zauderer, Edo Berger (Harvard), Dale A. Frail (NRAO) and Alicia
Soderberg
(Harvard) report:

"We re-observed the peculiar Swift event GRB110328A / Swift J164449.3+573451
(GCNs 11823, 11824) with the EVLA on March 30.49 UT.  At the two
frequenciescentered at 4.94 and 6.69 GHz we find that the
previously-detected radio
source (GCN 11836) has significantly brightened (~10-sigma confidence
level).

This provides the first clear evidence connecting the quiescent optical
source at z=0.35 (GCNs 11827, 11830, 11833, 11834), which is positionally
coincident with the brightening radio source, and the transient
X-ray/gamma-ray source (which is localized to only 1.7" radius accuracy; GCN
11826)."