GRB 110328A / Swift J164449.3+573451: Followup at 15 GHz
ATel #3252; Kunal Mooley, Joseph Richards, Walter Max-Moerbeck, Martin Shepherd (Caltech), Dale Frail (NRAO), Shri Kulkarni, and Anthony Readhead (Caltech)
on 1 Apr 2011; 06:46 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Mansi Manoj Kasliwal (mansi@astro.caltech.edu)
Subjects: Radio, Millimeter, Infra-Red, Optical, X-ray, Gamma Ray, Gamma-Ray Burst, Transient
GRB 110328A / Swift J164449.3+573451 (GCNs #11823, #11824) was observed on 31 March 2011 (UT) with the Owens Valley Radio Observatory (OVRO) 40-meter radio telescope (15 GHz center frequency; 3.0 GHz bandwidth; 2.5 GHz noise-equivalent reception bandwidth), at the location of the EVLA counterpart (GCNs #11836, #11848). Two observations were carried out:
(1) UT 08:48 to 09:10 hours, mean flux density: 2.45 +/- 1.14 mJy
(2) UT 16:02 to 16:59 hours, mean flux density: 5.14 +/- 0.84 mJy.
The 40-meter telescope at OVRO has a Dicke switched receiver; two beams (primary and reference) are used to reduce atmospheric and ground pickup. Possible sources of error are: (i) contaminating radio emission in the reference beam; this will reduce the observed flux density, and (ii) atmospheric transparency variations. Note that during the observations, the weather conditions were favorable.
More observations of this source with the 40-meter telescope are planned.
