Searching for Light Echoes after the SGR 1806-20- Hyperflare

Details Searching for Light Echoes after the SGR 1806-20- Hyperflare Searching for Light Echoes after the SGR 1806-20- Hyperflare

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10467m&link_type=abstract

HST Proposal ID #10467

Computer Science

Hst Proposal Id #10467

Scientific paper

On 2004 December 27, the ``magnetar'' candidate SGR1806-20 experienced a giant flare, the third detected from Soft Gamma-ray Repeaters since 1979 {GCN Circulars #2920, #2922}. This was by far the most luminous flare ever observed from a Galactic high energy source {more than 10^46 erg/s}. Following this event, SGR1806-20 was observed and detected in the radio band {GCN # 2928, #2930} and resolved into two parts: a point-like and a diffuse component. Our team, based on the radio position, detected the probable IR counterpart , the first IR counterpart ever for a SGR, by using the VLT NACO observations carried out in 2004 {ATel #278}. This DDT proposal is aimed at {a} studying, in the IR band, the afterglow diffuse component {linked to the giant flare event}, its shape and expansion rate as a function of time, {b} tracing back the flux at the onset of the flare through the detection and study of its scattered-light echoes, {c} searching for jet-like structures.

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