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ATEL # 2521; M. H. Wieringa (CSIRO), A. Possenti (INAF-O.A.Cagliari), M. Burgay (INAF-O.A.Cagliari), P. Esposito (INAF-IASF Milano), G. L. Israel (INAF-O.A.Roma), N. Rea (CSIC-ICE Barcelona), A. Tiengo (INAF-IASF Mi), R. Turolla (U. Padua), S. Zane (MSSL/UCL), D. Gotz (Irfu/SAp/CEA Saclay), S. Mereghetti (INAF-IASF Mi), L. Stella (INAF-0.A.Roma) on behalf of a larger collaboration
on 29 Mar 2010; 11:43 UT
Password Certification: Paolo Esposito (email@example.com)
Subjects: Radio, Pulsars, Soft Gamma-ray Repeaters
The soft gamma-ray repeater SGR 1833-0832 has been discovered on 2010 March 19 thanks to the detection of a short burst by Swift (GCN #10526). We observed its Swift/XRT position (GCN #10530) with the Australia Telescope Compact Array (ATCA).
ATCA observations at 20cm were made from 2010 Mar 22 21:40-22:20 and Mar 23 00:17-01:32, the total integration on source was 1.75 h. The frequency range covered was 1.1 to 1.9 GHz, average frequency 1.52 GHz, several ranges of RFI were excised from the spectrum. The frequency range was covered with 1 MHz channels.
The images including the short baselines were too confused by extended emission to yield useful limits. Continuum images combining all frequency channels were made using just the long baselines (baselines with antenna 6). These images were still somewhat confused by other sources in the field and the rms noise near the field center was twice that outside the beam.
In the image, the local rms at the SGR position is 0.3 mJy, whence the 3-sigma flux density limit for an unresolved continuum radio emission from SGR 1833-0832 is 0.9 mJy.
See ATEL #2515 for an upper limit on the pulsed radio emission from SGR 1833-0832 at 1.4 GHz.
We thank Philip Edwards of CSIRO-ATNF for promptly allocating us the time for this observation.