GRB 090429B
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 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. 

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.
Q22247
gamma-ray burst
Concept
Q837488
Burst Alert Telescope
MISC
Q837488
Swift satellite
MISC
Q744667
Gemini North
LOC
Q2513
Hubble Space Telescope
MISC
Q3967221
photometric redshift
UNK
Q185153
erg
Concept
Q525
Sun
CEL
Q1096290
GRB 090429B
DIS
2009-04-29T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
29 April 2009
DATE
2009-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2009
DATE
2011-05-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
May 2011
DATE
1052-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1052
DATE
1033-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1033
DATE
+2.5^^http://www.w3.org/2001/XMLSchema#decimal
2.5
NUMBER
+13.14^^http://www.w3.org/2001/XMLSchema#decimal
13.14
NUMBER
+90^^http://www.w3.org/2001/XMLSchema#decimal
90
NUMBER
+9.06^^http://www.w3.org/2001/XMLSchema#decimal
9.06
NUMBER
+7^^http://www.w3.org/2001/XMLSchema#decimal
7
NUMBER
+3.5^^http://www.w3.org/2001/XMLSchema#decimal
3.5
NUMBER
+3.8^^http://www.w3.org/2001/XMLSchema#decimal
3.8
NUMBER
instance of
site of astronomical discovery
site of astronomical discovery
time of discovery or invention