Discovery of the optical afterglow of XRF 040812: VLT and Chandra observations

Details Discovery of the optical afterglow of XRF 040812: VLT and Chandra observations Discovery of the optical afterglow of XRF 040812: VLT and Chandra observations

2006-12-21

arxiv.org/abs/astro-ph/0612644v1

NuovoCim.B121:1467-1468,2006

Astronomy and Astrophysics

Astrophysics

To be published in the proceedings of the conference "SWIFT and GRBs: Unveiling the Relativistic Universe", Venice, June 5-9,

Scientific paper

10.1393/ncb/i2007-10281-2

We present Chandra and VLT observations of the X-Ray Flash XRF 040812. The X-ray analysis reveals with high precision the position of a hard, fading source. A careful analysis of our I-band VLT images taken starting 17 hours after the burst led to the discovery of the optical afterglow superimposed to a bright (I=21.5) host galaxy. The optical afterglow is seen decaying with an index of 1.1. We do not detect any jet break and supernova rebrightening in the optical light curve. The bright apparent luminosity of the host galaxy allows us to get a rough estimate of the redshift, comparing with a set of GRB/XRF host galaxies with known luminosity and redshift. Such comparison suggests a redshift of XRF 040812 in the range 0.3

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