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WSRT Radio and Polarization Detection of GRB 100925A / MAXI J1659-152

ATEL # 2874; A.J. van der Horst (NASA/MSFC/ORAU), J. Granot (U of Hertfordshire), Z. Paragi (JIVE), C. Kouveliotou (NASA/MSFC), R.A.M.J. Wijers (U of Amsterdam) and E. Ramirez-Ruiz (UC Santa Cruz)
on 27 Sep 2010; 1:13 UT
Password Certification: Alexander van der Horst (

Subjects: Radio, Transients
Referred to by ATEL #: 2875, 2880, 2881, 2884, 2906, 2918

We observed the position of the hard X-ray transient GRB 100925A / MAXI J1659-152 (GCN 11296, ATel #2873, GCN 11307) with the Westerbork Synthesis Radio Telescope at 4.8 GHz, at September 26 14.27 to 19.75 UT, i.e. 1.37 days after the Swift/BAT trigger (GCN 11296) and 1.60 days after the start of the source brightening in MAXI/GSC (ATel #2873). We detect a radio source at the Swift/UVOT position of the transient (GCN 11298), with a flux density of 4.92 +/- 0.04 mJy. The source is linearly polarized at a level of 23 +/- 2 %, but there is no circular polarization detected, with a 3-sigma upper limit of 2 %. We would like to thank the WSRT staff for rapidly scheduling and obtaining these observations.

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R. E. Rutledge , Editor
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