[vsnet-grb-info 20120] GRB 171205A: VLA detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22216
SUBJECT: GRB 171205A: VLA detection
DATE:    17/12/09 18:19:01 GMT
FROM:    Tanmoy Laskar at UC Berkeley  <tanmoylaskar at gmail.com>

T. Laskar (NRAO / UC Berkeley), D. L. Coppejans, R. Margutti (Northwestern
University), and K. D. Alexander (Harvard) report on behalf of a larger
collaboration:

"The VLA observed GRB 171205A (D'Elia et al.; GCN 22177) at multiple
frequencies from 4.49 GHz to 16.38 GHz beginning on 2017 December 9.58 UT
(4.3 days after the burst). At a mean frequency of 6 GHz, we detect a radio
source with a preliminary flux density of ~ 3 mJy at

RA = 11:09:39.5182 +/- 0.0001
Dec = -12:35:18.480 +/- 0.002

consistent with the Swift/XRT position (Osborne et al.; GCN 22179) and the
optical position (Izzo et al.; GCN 222180, Emery et al.; GCN 22181). The
spectral index is steeply rising to higher frequencies as nu^2, suggesting
a self-absorbed spectrum. Follow-up observations are planned. We thank the
VLA staff for rapidly scheduling and executing these service observations."