User talk:Daniel Perley

Welcome!

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GRB article
Thanks for your contributions on the gamma ray burst article. It is now vastly better than before.--JyriL talk 18:35, 7 August 2006 (UTC)

We did it!

 * Well, if you're too busy to edit, I suppose the next best way to contribute would be to find others who can! Perhaps some of your fellow students/professors would, given a push in the right direction, be interested in contributing. --Cryptic C62 · Talk 04:56, 4 June 2009 (UTC)

File source problem with File:GRB080319B illustration NASA.jpg
Thanks for uploading File:GRB080319B illustration NASA.jpg. I noticed that the file's description page currently doesn't specify who created the content, so the copyright status is unclear. If you did not create this file yourself, you will need to specify the owner of the copyright. If you obtained it from a website, then a link to the website from which it was taken, together with a restatement of that website's terms of use of its content, is usually sufficient information. However, if the copyright holder is different from the website's publisher, their copyright should also be acknowledged.

If you have uploaded other files, consider checking that you have specified their source and tagged them, too. You can find a list of files you have uploaded by following this link. Unsourced and untagged images may be deleted one week after they have been tagged, as described on criteria for speedy deletion. If the image is copyrighted under a non-free license (per Fair use) then the image will be deleted 48 hours after 04:02, 18 December 2009 (UTC). If you have any questions please ask them at the Media copyright questions page. Thank you. NW ( Talk ) 04:02, 18 December 2009 (UTC)

Main page appearance
Hello! This is a note to let the main editors of this article know that it will be appearing as the main page featured article on June 18, 2011. You can view the TFA blurb at Today's featured article/June 18, 2011. If you think it is necessary to change the main date, you can request it with the featured article directors or his delegate, or at Wikipedia talk:Today's featured article/requests. If the previous blurb needs tweaking, you might change it—following the instructions of the suggested formatting. If this article needs any attention or maintenance, it would be preferable if that could be done before its appearance on the Main Page so Wikipedia doesn't look bad. :D Thanks! ۞  Tb hotch  ™  &  (ↄ),  Problems with my English?  04:07, 16 June 2011 (UTC)

 



Gamma-ray bursts (GRBs) are flashes of gamma rays associated with extremely energetic explosions in distant galaxies. GRBs are the most luminous electromagnetic events known to occur in the universe. A typical burst lasts 20–40 seconds, but can last from ten milliseconds to several minutes. The initial burst is usually followed by a longer-lived "afterglow" emitted at longer wavelengths. Most observed GRBs are believed to be a narrow beam of intense radiation released during a supernova event, as a rapidly rotating, high-mass star collapses to form a neutron star or black hole. The sources of most GRBs are billions of light years from Earth, implying that the explosions are both extremely energetic and extremely rare. GRBs were first detected in 1967 by the Vela satellites, but it was not until 1997 that they were better understood, with the use of optical spectroscopy 1997 to detect the first X-ray and optical afterglows and to directly measure their redshifts. (more...)