GRB on November 3
19 Nov 2005 16:58:37 UTC
Topic 190183
(moderation:
I've read on www.skyandtelescope.com of a short gamma ray burst (GRB) coming from galaxy M81 or M82. Was it a magnetic phenomenon caused by a magnetar or a gravitational collapse? Has any interferometer seen it?
Tullio
GRB on November 3
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Hi, Tullio, good to talk with you again!
The GRB you're asking about was detected in the Ursa Major constellation, on 11/03/05 at 09:25:43.785 UTC, by the Konus-WIND experiment, and also by a gamma-ray detector on board Mars Odyssey. The light curve for it is shown in the graph below. Short burst (~0.17 seconds), longer fade, resembling 'Soft Gamma-ray Repeaters', which are neutron stars having episodes where they blast out gamma-rays. The position of this one is approximate (difficult to triangulate), and may coincide with M81 (easy to see with binoculars), and the hope is that it will 'repeat' again in the future.
And here's a site you'll probably want to bookmark, if you're interested in GRBs (where I found the above info) Gamma-ray Burst Real-time Sky Map
RE: Hi, Tullio, good to
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Thanks, Chipper, I too am glad to talk again to you. I was following your interventions in rhe X-binaries thread. I did not intervene, too many years have passed since I studied Feynman diagrams! I have already bookmarked the site you suggest, but I could not find any GRB on December 27, 2004, which Sky&Telescope mentions as a powerful one. There are one on December 26 and one on December 28 only. Speaking of violent events like supernovae, I have a clipping of newspaper article from 1987 saying that some evidence of GW was detected by an Italian supercooled detector in Frascati, coinciding with a burst of neutrinos detected in the Mount Blanc tunnel by another Italian team. But I have no other documentation on this (possible) GW detection. Back in 1970, while working as a physics and astronomy editor, I published something about Weber's announce and I was severely scolded by an elementary particle physicist! General relativity was not "in" at that time but then a nuclear physicist of the caliber of Edoardo Amaldi, one of Fermi's coworkers, started looking for GW. I know there is an Italian/French laser interferometeter in Cascina, Tuscany (called Virgo) but I don't know if it is producing data. Cheers.
Tullio
RE: Hi, Tullio. Was that a
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OK, Chipper, did you know that your images screw the resolution settings up, and Password Manager pops up, wanting to know if I'd like it to remember values for Ligo Log? Please, at least downsize in the future. The password prompt is a first. This is on Firefox 1.5rc3.
Michael
microcraft
"The arc of history is long, but it bends toward justice" - MLK
RE: RE: Hi, Tullio. Was
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I have the LIGO password manager popping up too on Mozilla 1.7. Thanks to Chipper for the informations on VIRGO. It is close to my son's home in Cascine di Buti in Tuscany. I'd love to visit it. Is there any chance of VIRGO data processing in E&H?
Tullio
RE: RE: RE: Hi, Tullio.
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I've got it popping up on IE too.
Kathryn
Kathryn :o)
Einstein@Home Moderator
Ouch. Well, certainly in
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Ouch. Well, certainly in hindsight, I should've posted links to the graphs, but I thought it would be easier for everyone else if they could view the content without opening additional windows or hopping back and forth. The password was set in my browser from when I made posts on the 'Did S5 run get started' thread, so I didn't even get prompted for it when posting in this thread. I thought there might be some complaints on the size of the graphs, but my thinking was that the worth of the content outweighed the inconvenience of using a scroll bar.
I certainly didn't mean to make things confusing, or to cause extra work for the moderators, but it's too late for me to edit the post now. I can offer my apologies here, but others may need the password to read it. Ouch! I'm sorry... :(
RE: Thanks to Chipper for
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LIGO, GEO and VIRGO scientists and management are working towards a data-sharing agreement, although the details are still under discussion and so there is no certainty that it will happen. However if an agreement is reached then I hope we will also be crunching VIRGO data on Einstein@Home!
Bruce
Director, Einstein@Home
RE: RE: Thanks to Chipper
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Thanks for this, Bruce, and thank you for fixing the thread. I'm sorry to have caused extra work for you, and very sorry for the confusion/frustration I caused others. I know it's no consolation, but I rarely make the same mistake twice...
Wow, there was a nice notice
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Wow, there was a nice notice of moderation from E@H in my inbox. I'm grateful, especially with the benefit of hindsight, for the opportunity to edit and repost:
Tullio had said:
Here's a graph showing the good progress of VIRGO's Commissioning runs. The C7 run looks quite close to LIGO Hanford's, and LIGO Livingston's sensitivities (during the S4 run).
Graph of VIRGO Commissioning Runs Sensitivities
Actually, here's an excellent graph showing just how close VIRGO is getting, compared to LIGO during S4:
Graph of LIGO and VIRGO Sensitivities
Also interesting to note that the LIGO instruments are equipped with 'GRB Monitors'. You can see it on a screenshot of LIGO Hanford's Site Overview (it's near the lower right-hand corner of the panel; please see this thread for info on how to view the screenshot), and there was mention of a GRB event in LIGO Livingston's log for today (24 Nov 05)! Quoting from the log entry,
Another good one to bookmark: VIRGO :)
RE: Wow, there was a nice
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So it appears that the laser interferometers are using the same approach that Joe Weber pioneered in the Sixties, that of events observed in coincidence by different observatories. But I do not understand the reference to the train. Where was it, in Louisiana, Washington State or Germany? As far as I know, there is no train running near VIRGO, the Pisa to Florence rail line is farther away.
Tullio