Other
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1303s&link_type=abstract
American Astronomical Society, HEAD meeting #9, #13.03; Bulletin of the American Astronomical Society, Vol. 38, p.367
Other
Scientific paper
We report on a new effort to search the public time-ordered datasets acquired with the Wilkinson Microwave Anisotropy Probe (WMAP) for transient signals associated with gamma-ray bursts (GRBs) and other high-energy cosmic sources. This program is an extension of earlier work in which we searched the archival database of the Differential Microwave Radiometers (DMR) aboard the COBE satellite for microwave transients associated with GRBs. In this previous investigation we demonstrated that the COBE/DMR serendipitously observed a number of GRBs detected with the BATSE instrument aboard the Compton Gamma Ray Observatory (CGRO) and we established the first limits on prompt microwave emission from GRBs. The increased sensitivity and angular resolution of the WMAP radiometers compared to the COBE/DMR lead to a factor of 10,000 improvement in overall point-source sensitivity. Such limits approach the signal levels predicted in the microwave band for the peak prompt emission arising from reverse shocks in GRBs. The detection of prompt microwave emission would provide further insight into burst physics and the physical environments in which bursts occur. We are also searching for transient or flaring signals from active galaxies and similar high-energy sources that are observed in the cumulative WMAP data as "foreground" point sources of microwave emission. We acknowledge partial support for this work through NASA grant NNG05-GN94G.
Hart D'arcy
Jackson Paul D.
Mbonye Manasse
Stacy John Gregory
Winkler Ch.
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