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 22216

GRB 171205A: VLA detection
2017-12-09T18:19:01Z (6 years ago)
Tanmoy Laskar at UC Berkeley <>
T. Laskar (NRAO / UC Berkeley), D. L. Coppejans, R. Margutti (Northwestern
University), and K. D. Alexander (Harvard) report on behalf of a larger

"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."
Looking for U.S. government information and services? Visit