GCN Circular 21360
Subject
GRB170714A: ATCA observation
Date
2017-07-22T22:50:47Z (7 years ago)
From
Luigi Piro at INAF <luigi.piro@iaps.inaf.it>
R. Ricci (INAF/IRA-Bologna), M. Wieringa (ATNF,CSIRO), L. Piro(INAF/IAPS),
E. Troja(NASA/GSFC), K. Bannister (ATNF,CSIRO) and B.
Gendre (Virgin Islands University) report:
We observed the ultra-long gamma-ray burst GRB170714A (D'Ai' et al. GCN
21340; Evans et al. GCN 21341; Kann et al. GCN 21345; Palmer et al. GCN
21347) with ATCA on 2017 July 20 at 17 and 21 GHz.
We detect a source ~7" northward of the position of the GRB optical
counterpart (de Ugarte Postigo et al. GCN 21346). Given the ATCA
configuration, this position is consistent at about 2.5 sigma with the GRB
optical counterpart. However, we cannot exclude contamination from the
source detected at higher frequency by NOEMA (de Ugarte Postigo et al.,
GCN 21356), thus we conservatively estimate an upper limit of ~ 50uJy at
19GHz to the radio emission from the GRB.
Future ATCA observations are planned under our program on ultralong GRBs
(PI:L. Piro).
We thank the ATCA staff for scheduling this target of opportunity.