An Energetic Blast Wave from the 2004 December 27 Giant Flare of the Soft Gamma-ray Repeater Sgr

An Energetic Blast Wave from the December 27 Giant Flare of the Soft Γ-ray Repeater 1806-20

Recent follow-up observations of the December 27 giant flare of SGR 1806-20 have detected a multiplefrequency radio afterglow from 240 MHz to 8.46 GHz, extending in time from a week to about a month after the flare. The angular size of the source was also measured for the first time. Here we show that this radio afterglow gives the first piece of clear evidence that an energetic blast wave swee...

/ 05 02 08 5 v 1 4 F eb 2 00 5 An energetic blast wave from the December 27 giant flare of the soft γ - ray repeater 1806 - 20

Pure and Loaded Fireballs in Soft Gamma-ray Repeater Giant Flares

On December 27, 2004, a giant flare from SGR 1806−20 was detected on earth. Its thermal spectrum and temperature suggest that the flare resulted from an energy release of about 1047 erg/sec close to the surface of a neutron star in the form of radiation and/or pairs. This plasma expanded under its own pressure producing a fireball and the observed gamma-rays escaped once the fireball became opt...

The first giant flare from SGR 1806 – 20 : observations with the INTEGRAL SPI Anti - Coincidence Shield

A giant flare from the Soft Gamma-ray Repeater SGR 1806–20 has been discovered with the INTEGRAL gamma-ray observatory on 2004 December 27 and detected by many other satellites. This tremendous outburst, the first one observed from this source, was a hundred times more powerful than the two giant flares previously observed from other Soft Gamma-ray Repeaters (SGR). The 50 ms resolution light cu...

A Two-component Explosion Model for the Giant Flare and Radio Afterglow from Sgr1806-20

The brightest giant flare from the soft γ-ray repeater (SGR) 1806-20 was detected on 2004 December 27. The isotropic-equivalent energy release of this burst is at least one order of magnitude more energetic than those of the two other SGR giant flares. Starting from about one week after the burst, a very bright (∼ 80 mJy), fading radio afterglow was detected. Follow-up observations revealed the...