|Other designations||GRB 090429B|
|Event type||Gamma-ray burst|
|Date||29 April 2009|
|Duration||5.5 ±0.1 second|
|Instrument||Neil Gehrels Swift Observatory|
|Right ascension||14h 02m 40.10s|
|Declination||+32° 10′ 14.6″|
|Total energy output||3.5 × 1052 erg|
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. 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. Though this burst was detected in 2009, it was not until May 2011 that its distance estimate 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.
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.
- Cucchiara, A.; Levan, A. J.; Fox, D. B.; Tanvir, N. R.; Ukwatta, T. N.; Berger, E.; Krühler, T.; Yoldaş, A. Küpcü; Wu, X. F.; Toma, K.; Greiner, J.; E. Olivares, F.; Rowlinson, A.; Amati, L.; Sakamoto, T.; Roth, K.; Stephens, A.; Fritz, Alexander; Fynbo, J. P. U.; Hjorth, J.; Malesani, D.; Jakobsson, P.; Wiersema, K.; O'Brien, P. T.; Soderberg, A. M.; Foley, R. J.; Fruchter, A. S.; Rhoads, J.; Rutledge, R. E.; Schmidt, B. P.; Dopita, M. A.; Podsiadlowski, P.; Willingale, R.; Wolf, C.; Kulkarni, S. R.; D’Avanzo, P. (20 July 2011). "A PHOTOMETRIC REDSHIFT OF ∼ 9.4 FOR GRB 090429B". The Astrophysical Journal. 736 (1): 7. arXiv:1105.4915. Bibcode:2011ApJ...736....7C. doi:10.1088/0004-637X/736/1/7.
- 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".