[vsnet-grb-info 19616] GRB170714A: ATCA observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  21360
SUBJECT: GRB170714A: ATCA observation
DATE:    17/07/22 22:50:47 GMT
FROM:    Luigi Piro at INAF  <luigi.piro at 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.