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By far the brightest optical afterglow of any gamma-ray burst. GRB 080916C: z = 4.35 [Ref 9] Fermi: Formerly the most energetic gamma-ray burst observed. GRB 090423: R.A. 09 h 55 m 33.08 s Decl. +18° 08′ 58.9″ z = 8.2: Swift: Remains the record holder for most distant observed object in the universe with spectroscopic confirmation. [2 ...
A common gamma-ray log records the total radiation and cannot distinguish between the radioactive elements, while a spectral gamma ray log (see below) can. For standard gamma-ray logs, the measured value of gamma-ray radiation is calculated from concentration of uranium in ppm, thorium in ppm, and potassium in weight percent: e.g., GR API = 8 ...
The formation evaluation gamma ray log is a record of the variation with depth of the natural radioactivity of earth materials in a wellbore. Measurement of natural emission of gamma rays in oil and gas wells are useful because shales and sandstones typically have different gamma ray levels.
The gamma ray log is useful in holes drilled with air or with oil based muds, as these wells have no SP voltage. Even in water-based muds, the gamma ray and SP logs are often run together. They comprise a check on each other and can indicate unusual shale sections which may either not be radioactive, or may have an abnormal ionic chemistry.
During such drilling, data is acquired from the drilling rig sensors for a range of purposes such as: decision-support to monitor and manage the smooth operation of drilling; to make detailed records (or well log) of the geologic formations penetrated by a borehole; to generate operations statistics and performance benchmarks such that ...
As of April 2023, 14 missions are sending alerts to the GCN : [1] INTErnational Gamma-Ray Astrophysics Laboratory (), a gamma-ray telescope; Swift, a gamma-ray telescope, which provides data products not previously available from prior missions, including spectra, images, and lightcurves.
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It was published in 2020 that a gamma-ray burst was detected ~0.5 seconds after the LIGO trigger, lasting 6 seconds and bearing similarities to GRB170817 (such as weakness [most power in sub-100 keV, or soft X-rays) bands], elevated energetic photon background levels [signal exceeding background by less than a factor of 2], and similar ...