The X-ray Fluence of the SGR 1806-20 Hyperflare

Details The X-ray Fluence of the SGR 1806-20 Hyperflare The X-ray Fluence of the SGR 1806-20 Hyperflare

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cxo..prop.1857f&link_type=abstract

Chandra Proposal ID #06508201

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Chandra Proposal Id #06508201

Scientific paper

On 17 Dec 2004, SGR 1806-20 emitted the brightest burst ever observed from a Galactic source. This burst, first reported by the Integral mission (GCN 2920), saturated detectors on every high-energy satellite. The current lower limit to its fluence, 0.3 erg cm-2 (GCN 2936), would make the burst luminosity roughly 10^46 erg, dozens to hundreds of times brighter than the "giant flares" that have previously been observed from other SGRs -- bright enough that hyperflares in nearby galaxies could contribute to the population of short-hard gamma-ray bursts (GCN 2942). We propose to make the first accurate measurement of the fluence in this flare by observing the X-ray scattering halos produced by molecular clouds between Earth and SGR 1806-20; five clouds with A_V>2 mag are known from radio observations (Corbel & Eikenberry 2004, A&A 419, 191). The X-ray rings from four of these clouds will be observable with Chandra, allowing four independent estimates of the fluence of the hyperflare.

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