Astronomy Picture of the Day . ... GSFC , NASA Explanation: Using graphics and data from NASA's Compton Gamma Ray Observatory , this animation illustrates one of the most exciting mysteries of modern astrophysics, gamma-ray bursts . Incredibly gamma-ray bursts, sudden flashes of radiation with over 100,000 times the energy of visible light photons, occur several times a day. ... Publications with keywords: gamma-ray burst - gamma ray . Publications with words: gamma-ray burst - gamma ray . ...

... November 4, 1999 . Gamma-Ray Bursting . ... GSFC , NASA . Explanation: Using graphics and data from NASA's Compton Gamma Ray Observatory , this animation illustrates one of the most exciting mysteries of modern astrophysics, gamma-ray bursts . ... Originating far across the Universe, gamma-ray bursts are now known to be the most powerful explosions since the big bang and may yet prove to be useful tools for exploring the distant cosmos. ... About APOD > . ... NASA Technical Rep.: ...

... About ATNF overview . ... Governance overview . Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Our people overview . ... Australia Telescope 20GHz Survey . ... What is a pulsar? ... EGRET High Energy Gamma-Ray Pulsar Studies III: A Survey . ... Abstract The 3.5 year database of the Energetic Gamma Ray Experiment Telescope (EGRET) on board the Compton Gamma Ray Observatory has been surveyed for gamma-ray emission from all known spin-powered pulsars. ...

... November 5, 1997 . The Milky Way's Gamma-Ray Halo . Credit: D. Dixon ( UCR ), D. Hartmann ( Clemson ), E. Kolaczyk ( U. Chicago ), NASA . Explanation: Our Milky Way galaxy appears to be surrounded by a halo of gamma rays . Gamma rays are the most energetic form of electromagnetic radiation , with more than a hundred thousand times the energy of visible light, but known gamma-ray sources don't account for the diffuse distribution of this high-energy glow. ... About APOD > . ...

home publications > mercury . SEARCH ASP SITE: Match ALL words Match ANY word . ... ASP Conference Series . ... Publications of the ASP (PASP) . ... Mercury's Time to "Shine" . ... As seen from Earth, three celestial bodies sometimes pass in front of the Sun: the Moon, Venus, and Mercury. And in November, it is Mercury?s turn. ... Transits of Venus are very rare, indeed?none occurred in the entire 20th century?but Mercury transits the Sun about thirteen times every century. ... publications . ...

... This is a preliminary summary of the event on November 24, 1996, considered during the INTERBALL Workshop in Kiljavanranta, Finland, February 1998. ... Pronounced plasma sheet thinning (Bz decrease) . ... Particle burst observed inside the Polar Cap and in tail lobes . A short burst of particles detected by the Auroral Probe particle detectors during the Polar Cap crossing at 21:45 UT, almost simultaneously with the Tail Probe detectors registration of the particle burst inside the North Lobe. ...

Isabel Leonor University of Oregon search for short-duration GW bursts coincident with gamma-ray burst triggers ~1 to 10 ms, e.g. supernova core-collapse models, end of inspiral merger take advantage of readily-available and readilyaccessible ... triggers are from Interplanetary Network (IPN) (KonusWind, Ulysses, Mars Odyssey, others), INTEGRAL , HETE prepare for Swift triggers November 5, 2004 MIT Burst F2F Meeting I ... November 5, 2004 MIT Burst F2F Meeting I. Leonor 14 ! ...

STScI . STScI Hosts "Habitable Worlds Across Time and Space" Symposium April 28-May 1 . ... What is STScI . ... Spring Symposium Poster . ... During the four-day symposium "Habitable Worlds Across Time and Space," scientists from diverse fields will gather at the Space Telescope Science Institute in Baltimore, Maryland, on April 28 through May 1, to discuss the formation and long-term evolution of terrestrial bodies throughout the various phases of stellar and Galactic evolution. ...

... A pair of galaxies has grabbed the attention of astronomers when they were literally thrown into the spotlight. The galaxies were lit up by one of the brightest explosions in the Universe: a Gamma-Ray Burst . Astronomers think that the explosions of massive young stars power these bursts of light. ... By studying the light after it has passed through the galaxies, for example, astronomers can work out what types of atoms they contain, such as oxygen and copper. ...

A Brief History of the Discovery of Cosmic Gamma-Ray Bursts - draft april 17, 1995 - J.Bonnell In October of 1963 the US Air Force launched the first in a series of satellites inspired by a recently signed nuclear test ban treaty. ... The event appeared to be a cosmic gamma-ray burst but at the time the constellation of satellites did not have sufficient timing resolution at the trigger to make a good determination of direction to the burst source. ...

... 1994: . Deep CCD images of the bright gamma-ray bursts GRB790418 and GRB790613 localization regions were obtained for the first time. In both cases, a faint blue star-like object (V = 24.5 m , BV m ) was detected within the region of localization of gamma-ray bursts. ... Based on sixty daily instantaneous spectra of the object SS433, obtained on the RATAN-600 in April-May 1994, we traced its variability in four very powerful flares at five frequencies. ... Archive . ...

... Show Times . ... Please select the appropriate show programme either 'term time' or 'school holiday' period. ... For more information on new events please visit the Armagh Planetarium Events Blog . ... Due to the darkness and sound levels children under six years old are only permitted to shows appropriate to this age range. Check the shows now playing page to find out what shows are suitable for young children. ... Armagh Planetarium reserves the right to change the show programme without notice. ...

... Archives . ... Sep 9th, 2011| 01:05 pm | ... We organized a Special Session on Time Series in High Energy Astrophysics: Techniques Applicable to Multi-Dimensional Analysis on Sep 7, 2011, at the AAS-HEAD conference at Newport, RI. The talks presented at the session are archived at http://hea-www.harvard.edu/AstroStat/#head2011 . ... Tags: 2011 , AAS , HEAD , September , special session , Timing Analysis . ... AAS-HEAD 2011] Time Series in High Energy Astrophysics . ... Chandra Blog . ...

... Exposure Time Calculator (ETC) . ... ESO - Public Surveys . ... the recommended values to use for DIT, . ... Detector on-chip integration (DIT): seconds. to your chosen value - a separate page gives recommended values to use for DIT - for modes 1 and 2 below you may wish to start with the maximum recommended values as these will minimize the effect of read noise (a total object exposure of Y secs with DIT=X secs will produce Y/X lots of read noise) and give you a lower limit on the time needed. ...

... Proposing for VLBI Time at Arecibo . ... Documentation (Field System, VLBA4 terminal, Mark 5 system) . ... In 2001, the Arecibo Observatory received its hybrid VLBA-MARK IV (VLBA4) data acquisition system, and currently NAIC commits Arecibo to support VLBI observing up to a maximum of 4% of the 305-m's observing time. ... Tracking Time (h:mm) . ... The inclusion of the 305-m Arecibo radio telescope can dramatically boost the sensitivity of VLBI observations, even with its limited source tracking...

... arfgen (arfgen-1.75.6) [?? Meta Index / Home Page / Description These modes are treated as a special case within arfgen . ... In Timing mode it is recommended to take the full range of RAW-Y when extracting an EPIC-pn spectrum (in MOS the RAW-Y information is not present). It can be useful to take a restricted RAW-Y range in Burst mode to exclude contamination from the on-axis source. ... Such a scaling is not applied for Timing mode data. ...

... For SIMS (Secondary Ion Mass Spectrometry) analysis, a solid surface is bombarded by primary ions of some keV energy. ... The subsequent mass analysis of the emitted ions provides detailed information on the elemental and molecular composition of the surface. ... Extremely short ion pulses with a duration below . ... By rastering a fine-focussed ion beam over the surface, like an electron beam in an electron microprobe, mass resolved secondary ion images (chemical maps) can be obtained...

Blackholes Forum Message . ... Can Black Holes Create Space Time? ... Quasar jet streams (QJS) have been exhibiting Faster than light motion since they were first discovered by radio astronomy a long time ago. ... But what if Black holes were creating Space time, what if a relationship between matter energy and space time exists, in a conundrum what can matter exist in, it can exist in side of it's self, how about this as a hypothesis, can black holes create space time? ... www.astronomy.net . ...

... This "collapsar" picture may explain at least one class of gamma-ray bursts, cosmic explosions that are a million trillion times as bright as the sun! Gamma-ray bursts last for anywhere from a few milliseconds to several minutes, and for that time they are the brightest source of gamma-rays in the entire observable Universe. The energy from one event is enough to supply the entire world's electrical energy needs for approximately a hundred million billion billion years. ...

... The close X-ray binary with relativisic jest, contained probably a black hole, Cygnus X-3 has been detected in first time in Gamma-rays at enegries higher 100 МeV (AGILE, Tavani et al., ... The bright radio flares from Cygnus X-3, caused by the massive ejections of matter with velocity close to speed of light accur in the certain ''huper-sort'' X-ray states (RXTE PCA), that was in the first time determined in the studies of HID -- ''hardness-intensity diagram'' [Fig.4]. ...