Confirmation of the Fading Afterglow From the Short Burst GRB 050709

Details Confirmation of the Fading Afterglow From the Short Burst GRB 050709 Confirmation of the Fading Afterglow From the Short Burst GRB 050709

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cxo..prop.1873f&link_type=abstract

Chandra Proposal ID #06408223

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Chandra Proposal Id #06408223

Scientific paper

Seven years after the afterglow detections that revolutionized studies of the long/soft gamma-ray bursts (LSBs), not even one afterglow of a short/hard GRB (SHB) has been seen. Theoretical calculations suggest that SHB afterglows will be much fainter than LSB afterglows, faint enough that ground-based detections should probably not be expected. Deep Chandra observations, on the other hand, if made within days of the burst, should be able to find the X-ray afterglow. This appears to be the case with the recent GRB050709 in which Chandra observations conducted 2.5 days after the burst detected a source (GCN 3585). Its flux is consistent with a t^-1.4 power-law decay from the afterglow peak observed by the HETE SXC at 100 s after the burst. Spectroscopy undertaken with Gemini of an optical source near the Chandra position (GCN 3589) yields a redshift z=0.16. The SHB mystery will be solved if the Chandra source fades away in time.

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