GCN Circular 22350
Subject
e-MERLIN detection of GRB 171205A
Event
Date
2018-01-16T08:29:20Z (8 years ago)
From
Miguel Perez-Torres at IAA-CSIC <torres@iaa.es>
Miguel Perez-Torres (IAA-CSIC), J. Moldon (JBCA), E. Varenius (JBCA), R. Beswick
(JBCA), Antxon Alberdi (IAA-CSIC), S. Bradley Cenko (NASA), and Assaf Horesh
(HUJI) report:
We observed GRB 171205A (D'Elia et al., GCN 22177) with the electronic
Multi-Element Radio Linked Interferometer Network (eMERLIN) on 2017 Dec 20 (from
20.06 UT until 20.35 UT) and on 2017 Dec 21 (from 21.06 UT until 21.31 UT), for
a total of 12.7 hr.
The observations were carried out with a five-array telescope (Mk2, Pi, Da, De,
Cm) at a central frequency of 5.1 GHz, with a bandwidth of 512 MHz. The
synthesized beam was of 0.22x0.030 sq. arcsec at a position angle of 17.7 deg.
We clearly detected GRB 171205A with a peak flux density of 7.9 mJy/beam. The
off-source rms was of 0.05 mJy/b, and the calibration uncertainty is about 5%,
for a total uncertainty in the GRB flux density of 0.4 mJy.
We thank the e-MERLIN staff for the time allocation and their help with the
observations.