GRB 090429B

Short description: Gamma-ray burst in constellation Canes Venatici

GRB 090429BRight ascension|  14h 02m 40.10s

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Declination| +32° 10′ 14.6″
Total energy output| 3.5 × 1052 erg

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GRB 090429B was a gamma-ray burst observed on 29 April 2009 by the Burst Alert Telescope aboard the Swift satellite. The burst triggered a standard burst-response observation sequence, which started 106 seconds after the burst.[1] The X-ray telescope aboard the satellite identified an uncatalogued fading source. No optical or UV counterpart was seen in the UV–optical telescope. Around 2.5 hours after the burst trigger, a series of observations was carried out by the Gemini North telescope, which detected a bright object in the infrared part of the spectrum. No evidence of a host galaxy was found either by Gemini North or by the Hubble Space Telescope.[1] Though this burst was detected in 2009, it was not until May 2011 that its distance estimate of 13.14 billion light-years was announced. With 90% likelihood, the burst had a photometric redshift greater than z = 9.06, which would make it the most distant GRB known, although the error bar on this estimate is large, providing a lower limit of z > 7.[1][2]

The amount of energy released in the burst was estimated at 3.5 × 1052 erg. For a comparison, the Sun's luminosity is 3.8 × 1033 erg/s.[citation needed]

## See also

* GRB 090423, the most distant gamma-ray burst with spectroscopic confirmation

## References

1. ↑ 1.0 1.1 1.2 Cucchiara, A.; Levan, A. J.; Fox, D. B.; Tanvir, N. R.; Ukwatta, T. N.; Berger, E.; Krühler, T.; Yoldaş, A. Küpcü et al. (20 July 2011). "A PHOTOMETRIC REDSHIFT OFz~ 9.4 FOR GRB 090429B". The Astrophysical Journal 736 (1): 7. doi:10.1088/0004-637X/736/1/7. Bibcode: 2011ApJ...736....7C.
2. ↑ Space Daily, Explosion Helps Researcher Spot Universe's Most Distant Object, 27 May 2011

* This article incorporates public domain material from the National Aeronautics and Space Administration document "NASA's Swift Finds Most Distant Gamma-ray Burst Yet".

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