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GCN Circular 22187

GRB 171205A: NOEMA detection of a bright mm afterglow
2017-12-06T10:26:44Z (6 years ago)
Antonio de Ugarte Postigo at IAA-CSIC <>
A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), 
S. Schulze (Weizmann), M. Bremer, M. Krips (IRAM), 
C.C. Thoene, L. Izzo, D.A. Kann, Z. Cano, K. Bensch 
(HETH/IAA-CSIC), S. Martin Ruiz, I. de Gregorio (ALMA), 
S. Kim (PUC), R. S��nchez-Ramirez (INAF-IAPS), 
D. Malesani (DARK/NBI) report:

We observed the afterglow of GRB 171205A with 
NOEMA at 150GHz and 90GHz starting at 3:30 UT on the 
6th of December (20.2 hrs after the GRB onset). We 
detect a bright afterglow in 150GHz with a preliminary 
flux density estimate of 35-40 mJy. The coordinates 
of the detected source are (J2000 +/- 0.05"):

R.A.: 11:09:39.52
Dec.: -12:35:18.34

We note that if the flux density is confirmed, it would be 
the second brightest GRB ever detected in mm/submm 
wavelengths, after GRB 030329 (for a review on 
mm/submm data of GRBs see de Ugarte Postigo et al. 

Further follow-up observations are encouraged.
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