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Search for Primordial Black Holes with SGARFACE
M. Schroedter, F. Krennrich, S. LeBohec +7
The Short GAmma Ray Front Air Cherenkov Experiment (SGARFACE) uses the Whipple 10 m telescope to search for bursts of rays. SGARFACE is sensitive to bursts with duration from a…
Discovery of Very High-Energy Gamma-Ray Radiation from the BL Lac 1ES 0806+524
VERITAS Collaboration, V. Acciari, E. Aliu +90
The high-frequency-peaked BL-Lacertae object \objectname{1ES 0806+524}, at redshift z=0.138, was observed in the very-high-energy (VHE) gamma-ray regime by VERITAS between November…
Section on Extragalactic Science Topics of the White Paper on the Status and Future of Ground-Based TeV Gamma-Ray Astronomy
H. Krawczynski, A. M. Atoyan, M. Beilicke +32
This is a report on the findings of the extragalactic science working group for the white paper on the status and future of TeV gamma-ray astronomy. The white paper was commissione…
Jet breaks and Energetics of Swift GRB X-ray Afterglows
J. L. Racusin, E. W. Liang, D. N. Burrows +6
We present a systematic temporal and spectral study of all Swift-XRT observations of GRB afterglows discovered between 2005 January and 2007 December. After constructing and fittin…
Gamma Ray Burst Section of the White Paper on the Status and Future of Ground-based TeV Gamma-ray Astronomy
A. D. Falcone, D. A. Williams, M. G. Baring +20
This is a report on the findings of the gamma ray burst working group for the white paper on the status and future of TeV gamma-ray astronomy. The white paper is an APS commissione…
Status of the VERITAS Observatory
J. Holder, V. A. Acciari, E. Aliu +79
VERITAS, an Imaging Atmospheric Cherenkov Telescope (IACT) system for gammma-ray astronomy in the GeV-TeV range, has recently completed its first season of observations with a full…
VERITAS Observations of the BL Lac Object 1ES 1218+304
Pascal Fortin
The VERITAS collaboration reports the detection of very-high-energy (VHE) gamma-ray emission from the high-frequency-peaked BL Lac object 1ES 1218+304 located at a redshift of z=0.…
Long Term X-ray Monitoring Of The TeV Binary LS I +61 303 with RXTE
A. Smith, P. Kaaret, J. Holder +4
We report on the results of a long term X-ray monitoring campaign of the galactic binary LS I +61 303 performed by the Rossi X-ray Timing Explorer. This dataset consists of 1 ks po…
VERITAS Discovery of >200GeV Gamma-ray Emission from the Intermediate-frequency-peaked BL Lac Object W Comae
VERITAS Collaboration, V. A. Acciari, E. Aliu +80
We report the detection of very high-energy gamma-ray emission from the intermediate-frequency-peaked BL Lacertae object W Comae (z=0.102) by VERITAS. The source was observed betwe…
INTEGRAL observations of the blazar Mrk 421 in outburst (Results of a multi-wavelength campaign)
G. G. Lichti, E. Bottacini, M. Ajello +15
We report the results of a multi-wavelength campaign on the blazar Mrk 421 during outburst. We observed four strong flares at X-ray energies that were not seen at other wavelengths…
The Gamma Ray Burst section of the White Paper on the Status and Future of Very High Energy Gamma Ray Astronomy: A Brief Preliminary Report
A. D. Falcone, D. A. Williams, M. G. Baring +19
This is a short report on the preliminary findings of the gamma ray burst (GRB) working group for the white paper on the status and future of very high energy (VHE; >50 GeV) gamma-…
Observations of X-ray Flares from Gamma Ray Bursts
A. D. Falcone, D. Morris, J. Racusin +11
Swift-XRT observations of the X-ray emission from gamma ray bursts (GRBs) and during the GRB afterglow have led to many new results during the past two years. One of these exciting…
VERITAS Observations of the gamma-Ray Binary LS I +61 303
V. A. Acciari, M. Beilicke, G. Blaylock +74
LS I +61 303 is one of only a few high-mass X-ray binaries currently detected at high significance in very high energy gamma-rays. The system was observed over several orbital cycl…
Observation of gamma-ray emission from the galaxy M87 above 250 GeV with VERITAS
V. A. Acciari, M. Beilicke, G. Blaylock +74
The multiwavelength observation of the nearby radio galaxy M87 provides a unique opportunity to study in detail processes occurring in Active Galactic Nuclei from radio waves to Te…
Swift X-ray Afterglows and the Missing Jet Break Problem
J. L. Racusin, E. -W. Liang, D. N. Burrows +3
We present a systematic survey of the temporal and spectral properties of all GRB X-ray afterglows observed by Swift-XRT between January 2005 and July 2007. We have constructed a c…
A Search for Dark Matter Annihilation with the Whipple 10m Telescope
M. Wood, G. Blaylock, S. M. Bradbury +33
We present observations of the dwarf galaxies Draco and Ursa Minor, the local group galaxies M32 and M33, and the globular cluster M15 conducted with the Whipple 10m gamma-ray tele…
Observations of LSI+61303 with Swift
J. Holder, A. Falcone, D. Morris
The TeV emitting high-mass X-ray binary system LSI+61303 was observed with the Swift satellite from early September 2006 to early January 2007. Many of these observations were cont…
White Paper on the Status and Future of Ground-based Gamma-ray Astronomy
H. Krawczynski, J. Buckley, K. Byrum +8
In recent years, ground-based gamma-ray observatories have made a number of important astrophysical discoveries which have attracted the attention of the wider scientific community…
The Two-Component Afterglow of Swift GRB 050802
S. R. Oates, M. De Pasquale, M. J. Page +10
This paper investigates GRB 050802, one of the best examples of a it Swift gamma-ray burst afterglow that shows a break in the X-ray lightcurve, while the optical counterpart decay…
The First Survey of X-ray Flares from Gamma Ray Bursts Observed by Swift: Spectral Properties and Energetics
A. D. Falcone, D. Morris, J. Racusin +12
Observations of gamma ray bursts (GRBs) with Swift produced the initially surprising result that many bursts have large X-ray flares superimposed on the underlying afterglow. The f…
The First Survey of X-ray Flares from Gamma Ray Bursts Observed by Swift: Temporal Properties and Morphology
G. Chincarini, A. Moretti, P. Romano +24
We present the first systematic investigation of the morphological and timing properties of flares in GRBs observed by Swift/XRT. We consider a large sample drawn from all GRBs det…
GRB 050822: Detailed analysis of an XRF observed by Swift
O. Godet, K. L. Page, J. Osborne +10
We report on the temporal and spectral characteristics of the early X-ray emission from the GRB 050822 as observed by Swift. This burst is likely to be an XRF showing major X-ray f…
Attributes of flares in Gamma Ray Bursts: sample I
G. Chincarini, A. Moretti, P. Romano +14
We discuss some of the preliminary results and findings derived from the analysis of a first sample of flares detected by the XRT on board Swift. The analysis shows that the morpho…
Very High Energy Observations of Gamma-Ray Burst Locations with the Whipple Telescope
D. Horan, R. W. Atkins, H. M. Badran +56
Gamma-ray burst (GRB) observations at very high energies (VHE, E > 100 GeV) can impose tight constraints on some GRB emission models. Many GRB afterglow models predict a VHE compon…