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M S Briggs - One of the best experts on this subject based on the ideXlab platform.
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an ordinary short Gamma Ray Burst with extraordinary implications fermi gbm detection of grb 170817a
The Astrophysical Journal, 2017Co-Authors: Adam Goldstein, M S Briggs, E Burns, P Veres, R Hamburg, D Kocevski, C A Wilsonhodge, R D Preece, S Poolakkil, O J RobertsAbstract:On 2017 August 17 at 12:41:06 UTC the Fermi Gamma-Ray Burst Monitor (GBM) detected and triggered on the short Gamma-Ray Burst (GRB) 170817A. Approximately 1.7 s prior to this GRB, the Laser Interferometer Gravitational-wave Observatory triggered on a binary compact merger candidate associated with the GRB. This is the first unambiguous coincident observation of gravitational waves and electromagnetic radiation from a single astrophysical source and marks the start of gravitational-wave multi-messenger astronomy. We report the GBM observations and analysis of this ordinary short GRB, which extraordinarily confirms that at least some short GRBs are produced by binary compact mergers.
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the third fermi gbm Gamma Ray Burst catalog the first six years
Astrophysical Journal Supplement Series, 2016Co-Authors: Narayana P Bhat, W. S. Paciesas, C Meegan, Andreas Von Kienlin, M S Briggs, Michael J Burgess, E Burns, Vandiver ChaplinAbstract:Since its launch in 2008, the Fermi Gamma-Ray Burst Monitor (GBM) has triggered and located on average approximately two.-Ray Bursts (GRBs) every three days. Here, we present the third of a series ...
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the fermi gbm Gamma Ray Burst spectral catalog four years of data
Astrophysical Journal Supplement Series, 2014Co-Authors: D Gruber, Narayana P Bhat, M S Briggs, Adam Goldstein, E Bissaldi, Victoria Weller Von Ahlefeld, D Byrne, W H ClevelandAbstract:In this catalog we present the updated set of spectral analyses of Gamma-Ray Bursts (GRBs) detected by the Fermi Gamma-Ray Burst Monitor during its first four years of operation. It contains two types of spectra, time-integrated spectral fits and spectral fits at the brightest time bin, from 943 triggered GRBs. Four different spectral models were fitted to the data, resulting in a compendium of more than 7500 spectra. The analysis was performed similarly but not identically to Goldstein et al. All 487 GRBs from the first two years have been re-fitted using the same methodology as that of the 456 GRBs in years three and four. We describe, in detail, our procedure and criteria for the analysis and present the results in the form of parameter distributions both for the observer-frame and rest-frame quantities. The data files containing the complete results are available from the High-Energy Astrophysics Science Archive Research Center.
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the fermi gbm Gamma Ray Burst spectral catalog four years of data
arXiv: High Energy Astrophysical Phenomena, 2014Co-Authors: D Gruber, Narayana P Bhat, M S Briggs, Adam Goldstein, E Bissaldi, Victoria Weller Von Ahlefeld, D Byrne, W H ClevelandAbstract:In this catalog we present the updated set of spectral analyses of GRBs detected by the Fermi Gamma-Ray Burst Monitor (GBM) during its first four years of operation. It contains two types of spectra, time-integrated spectral fits and spectral fits at the brightest time bin, from 943 triggered GRBs. Four different spectral models were fitted to the data, resulting in a compendium of more than 7500 spectra. The analysis was performed similarly, but not identically to Goldstein et al. 2012. All 487 GRBs from the first two years have been re-fitted using the same methodology as that of the 456 GRBs in years three and four. We describe, in detail, our procedure and criteria for the analysis, and present the results in the form of parameter distributions both for the observer-frame and rest-frame quantities. The data files containing the complete results are available from the High-Energy Astrophysics Science Archive Research Center (HEASARC).
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batse observations of Gamma Ray Burst spectra
2013Co-Authors: D. L. Band, J. L. Matteson, W. S. Paciesas, Geoffrey N. Pendleton, C Meegan, R D Preece, R T Skelton, M S BriggsAbstract:We analyze time-averaged spectra from 86 bright Gamma-Ray Bursts from the first 5 years of the Burst And Transient Source Experiment (BATSE) on board the Compton Gamma Ray Observatory to determine whether the lowest energy data are consistent with a standard spectra form fit to the data at all energies. The BATSE Spectroscopy Detectors have the capability to observe photons as low as 5 keV. Using the Gamma-Ray Burst locations obtained with the BATSE Large Area Detectors, the Spectroscopy Detectors' low-energy response can be modeled accurately. This, together with a postlaunch calibration of the lowest energy Spectroscopy Detector discriminator channel, which can lie in the range 5-20 keV, allows spectral deconvolution over a broad energy range, approx. 5 keV to 2 MeV. The additional coverage allows us to search for evidence of excess emission, or for a deficit, below 20 keV. While no Burst has a significant (greater than or equal to 3 sigma) deficit relative to a standard spectra model, we find that 12 Bursts have excess low-energy emission, ranging between 1.2 and 5.8 times the model flux, that exceeds 5 sigma in significance. This is evidence for an additional low-energy spectral component in at least some Bursts, or for deviations from the power-law spectral form typically used to model Gamma-Ray Bursts at energies below 100 keV.
B Krishnan - One of the best experts on this subject based on the ideXlab platform.
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swift pointing and gravitational wave Bursts from Gamma Ray Burst events
Classical and Quantum Gravity, 2003Co-Authors: P J Sutton, L S Finn, B KrishnanAbstract:The currently accepted model for Gamma-Ray Burst phenomena involves the violent formation of a rapidly rotating solar-mass black hole. Gravitational waves should be associated with the black-hole formation, and their detection would permit this model to be tested. Even upper limits on the gravitational-wave strength associated with Gamma-Ray Bursts could constrain the Gamma-Ray Burst model. This requires joint observations of Gamma-Ray Burst events with gravitational and Gamma-Ray detectors. Here we examine how the quality of an upper limit on the gravitational-wave strength associated with Gamma-Ray Bursts depends on the relative orientation of the Gamma-Ray-Burst and gravitational-wave detectors, and apply our results to the particular case of the Swift Burst-Alert Telescope (BAT) and the LIGO gravitational-wave detectors. A result of this investigation is a science-based 'figure of merit' that can be used, together with other mission constraints, to optimize the pointing of the Swift telescope for the detection of gravitational waves associated with Gamma-Ray Bursts.
T. Krühler - One of the best experts on this subject based on the ideXlab platform.
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GRB 161219B/SN 2016jca: A low-redshift Gamma-Ray Burst supernova powered by radioactive heating
Astron.Astrophys., 2017Co-Authors: Z. Cano, L. Izzo, A. De Ugarte Postigo, C.c. Thöne, T. Krühler, K.e. Heintz, D. Malesani, S. Geier, C. Fuentes, T.w. ChenAbstract:Since the first discovery of a broad-lined type Ic supernova (SN) with a long-duration Gamma-Ray Burst (GRB) in 1998, fewer than fifty GRB-supernovae (SNe) have been discovered. The intermediate-luminosity Swift GRB 161219B and its associated supernova SN 2016jca, which occurred at a redshift of z = 0.1475, represents only the seventh GRB-SN to have been discovered within 1 Gpc, and hence provides an excellent opportunity to investigate the observational and physical properties of these very elusive and rare type of SN. As such, we present optical to near-infrared photometry and optical spectroscopy of GRB 161219B and SN 2016jca, spanning the first three months since its discovery. GRB 161219B exploded in the disk of an edge-on spiral galaxy at a projected distance of 3.4 kpc from the galactic centre. GRB 161219B itself is an outlier in the Ep,i − Eγ,iso plane, while SN 2016jca had a rest-frame, peak absolute V-band magnitude of MV = − 19.0 ± 0.1, which it reached after 12.3 ± 0.7 rest-frame days. We find that the bolometric properties of SN 2016jca are inconsistent with being powered solely by a magnetar central engine, and demonstrate that it was likely powered exclusively by energy deposited by the radioactive decay of nickel and cobalt into their daughter products, which were nucleosynthesised when its progenitor underwent core collapse. We find that 0.22 ± 0.08M⊙ of nickel is required to reproducethe peak luminosity of SN 2016jca, and we constrain an ejecta mass of 5.8 ± 0.3M⊙ and a kinetic energy of 5.1 ± 0.8 × 1052 erg. Finally, we report on a chromatic, pre-maximum bump in the g-band light curve, and discuss its possible origin.Key words: Gamma-Ray Burst: individual: GRB 161219B / supernovae: individual: SN 2016jca / Gamma-Ray Burst: general / supernovae: general
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the swift Gamma Ray Burst host galaxy legacy survey i sample selection and redshift distribution
The Astrophysical Journal, 2016Co-Authors: A. De Ugarte Postigo, T. Krühler, D A Perley, S Schulze, J Hjorth, Edo Berger, S B CenkoAbstract:We introduce the Swift Gamma-Ray Burst Host Galaxy Legacy Survey ("SHOALS"), a multi-observatory high-redshift galaxy survey targeting the largest unbiased sample of long-duration Gamma-Ray Burst (GRB) hosts yet assembled (119 in total). We describe the motivations of the survey and the development of our selection criteria, including an assessment of the impact of various observability metrics on the success rate of afterglow-based redshift measurement. We briefly outline our host galaxy observational program, consisting of deep Spitzer/IRAC imaging of every field supplemented by similarly deep, multicolor optical/near-IR photometry, plus spectroscopy of events without preexisting redshifts. Our optimized selection cuts combined with host galaxy follow-up have so far enabled redshift measurements for 110 targets (92%) and placed upper limits on all but one of the remainder. About 20% of GRBs in the sample are heavily dust obscured, and at most 2% originate from z > 5.5. Using this sample, we estimate the redshift-dependent GRB rate density, showing it to peak at z ~ 2.5 and fall by at least an order of magnitude toward low (z = 0) redshift, while declining more gradually toward high (z ~ 7) redshift. This behavior is consistent with a progenitor whose formation efficiency varies modestly over cosmic history. Our survey will permit the most detailed examination to date of the connection between the GRB host population and general star-forming galaxies, directly measure evolution in the host population over cosmic time and discern its causes, and provide new constraints on the fraction of cosmic star formation occurring in undetectable galaxies at all redshifts.
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the swift Gamma Ray Burst host galaxy legacy survey i sample selection and redshift distribution
arXiv: Astrophysics of Galaxies, 2015Co-Authors: A. De Ugarte Postigo, T. Krühler, D A Perley, S Schulze, J Hjorth, Edo Berger, S B CenkoAbstract:We introduce the Swift Gamma-Ray Burst Host Galaxy Legacy Survey ("SHOALS"), a multi-observatory high-redshift galaxy survey targeting the largest unbiased sample of long-duration Gamma-Ray Burst hosts yet assembled (119 in total). We describe the motivations of the survey and the development of our selection criteria, including an assessment of the impact of various observability metrics on the success rate of afterglow-based redshift measurement. We briefly outline our host-galaxy observational program, consisting of deep Spitzer/IRAC imaging of every field supplemented by similarly-deep, multi-color optical/NIR photometry, plus spectroscopy of events without pre-existing redshifts. Our optimized selection cuts combined with host-galaxy follow-up have so far enabled redshift measurements for 110 targets (92%) and placed upper limits on all but one of the remainder. About 20% of GRBs in the sample are heavily dust-obscured, and at most 2% originate from z>5.5. Using this sample we estimate the redshift-dependent GRB rate density, showing it to peak at z~2.5 and fall by about an order of magnitude towards low (z=0) redshift, while declining more gradually towards high (z~7) redshift. This behavior is consistent with a progenitor whose formation efficiency varies modestly over cosmic history. Our survey will permit the most detailed examination to date of the connection between the GRB host population and general star-forming galaxies, directly measure evolution in the host population over cosmic time and discern its causes, and provide new constraints on the fraction of cosmic star-formation occurring in undetectable galaxies at all redshifts.
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the dust extinction curves of Gamma Ray Burst host galaxies
Astronomy and Astrophysics, 2012Co-Authors: P Schady, J Greiner, T. Krühler, T Dwelly, M J Page, S R Oates, M De Pasquale, M Nardini, Peter W A Roming, A RossiAbstract:The composition and amount of interstellar dust within Gamma-Ray Burst (GRB) host galaxies is of key importance when addressing selection effects in the GRB redshift distribution, and when studying the properties of their host galaxies. As well as the implications for GRB research, probing the dust within the high-z hosts of GRBs also contributes to our understanding of the conditions of the interstellar medium and star-formation in the distant Universe. Nevertheless, the physical properties of dust within GRB host galaxies continues to be a highly contended issue. In this paper we explore the mean extinction properties of dust within the host galaxies of a sample of 17 GRBs with total host galaxy visual extinction AV 1), which may be indicative of there being a dependence between dust abundance and the wavelength dependence of dust extinction, as has been previously speculated.
Takashi Nakamura - One of the best experts on this subject based on the ideXlab platform.
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prompt emission from the counter jet of a short Gamma Ray Burst
Progress of Theoretical and Experimental Physics, 2018Co-Authors: Ryo Yamazaki, Kunihito Ioka, Takashi NakamuraAbstract:The counter jet of a short Gamma-Ray Burst (sGRB) has not yet been observed, while recent discoveries of gravitational waves (GWs) from a binary neutron star (NS) merger GW170817 and the associated sGRB 170817A have demonstrated that off-axis sGRB jets are detectable. We calculate the prompt emission from the counter jet of an sGRB and show that it is typically 23-26 mag in the optical-infrared band 10-10^3 sec after the GWs for an sGRB 170817A-like event, which is brighter than the early macronova (or kilonova) emission and detectable by LSST in the near future. We also propose a new method to constrain the unknown jet properties, such as the Lorentz factor, opening angle, emission radii, and jet launch time, by observing both the forward and counter jets. To scrutinize the counter jets, space GW detectors like DECIGO are powerful in forecasting the merger time (<~ 1 sec) and position (<~ 1 arcmin) (~ a week) before the merger.
D A Perley - One of the best experts on this subject based on the ideXlab platform.
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the swift Gamma Ray Burst host galaxy legacy survey i sample selection and redshift distribution
The Astrophysical Journal, 2016Co-Authors: A. De Ugarte Postigo, T. Krühler, D A Perley, S Schulze, J Hjorth, Edo Berger, S B CenkoAbstract:We introduce the Swift Gamma-Ray Burst Host Galaxy Legacy Survey ("SHOALS"), a multi-observatory high-redshift galaxy survey targeting the largest unbiased sample of long-duration Gamma-Ray Burst (GRB) hosts yet assembled (119 in total). We describe the motivations of the survey and the development of our selection criteria, including an assessment of the impact of various observability metrics on the success rate of afterglow-based redshift measurement. We briefly outline our host galaxy observational program, consisting of deep Spitzer/IRAC imaging of every field supplemented by similarly deep, multicolor optical/near-IR photometry, plus spectroscopy of events without preexisting redshifts. Our optimized selection cuts combined with host galaxy follow-up have so far enabled redshift measurements for 110 targets (92%) and placed upper limits on all but one of the remainder. About 20% of GRBs in the sample are heavily dust obscured, and at most 2% originate from z > 5.5. Using this sample, we estimate the redshift-dependent GRB rate density, showing it to peak at z ~ 2.5 and fall by at least an order of magnitude toward low (z = 0) redshift, while declining more gradually toward high (z ~ 7) redshift. This behavior is consistent with a progenitor whose formation efficiency varies modestly over cosmic history. Our survey will permit the most detailed examination to date of the connection between the GRB host population and general star-forming galaxies, directly measure evolution in the host population over cosmic time and discern its causes, and provide new constraints on the fraction of cosmic star formation occurring in undetectable galaxies at all redshifts.
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the swift Gamma Ray Burst host galaxy legacy survey i sample selection and redshift distribution
arXiv: Astrophysics of Galaxies, 2015Co-Authors: A. De Ugarte Postigo, T. Krühler, D A Perley, S Schulze, J Hjorth, Edo Berger, S B CenkoAbstract:We introduce the Swift Gamma-Ray Burst Host Galaxy Legacy Survey ("SHOALS"), a multi-observatory high-redshift galaxy survey targeting the largest unbiased sample of long-duration Gamma-Ray Burst hosts yet assembled (119 in total). We describe the motivations of the survey and the development of our selection criteria, including an assessment of the impact of various observability metrics on the success rate of afterglow-based redshift measurement. We briefly outline our host-galaxy observational program, consisting of deep Spitzer/IRAC imaging of every field supplemented by similarly-deep, multi-color optical/NIR photometry, plus spectroscopy of events without pre-existing redshifts. Our optimized selection cuts combined with host-galaxy follow-up have so far enabled redshift measurements for 110 targets (92%) and placed upper limits on all but one of the remainder. About 20% of GRBs in the sample are heavily dust-obscured, and at most 2% originate from z>5.5. Using this sample we estimate the redshift-dependent GRB rate density, showing it to peak at z~2.5 and fall by about an order of magnitude towards low (z=0) redshift, while declining more gradually towards high (z~7) redshift. This behavior is consistent with a progenitor whose formation efficiency varies modestly over cosmic history. Our survey will permit the most detailed examination to date of the connection between the GRB host population and general star-forming galaxies, directly measure evolution in the host population over cosmic time and discern its causes, and provide new constraints on the fraction of cosmic star-formation occurring in undetectable galaxies at all redshifts.
