Search

Start Over Subject gamma-ray astronomy Validation Level 2
391. The second Fermi-LAT >50GeV catalog (2FHL)
ID:
ivo://CDS.VizieR/J/ApJS/222/5
Title:
The second Fermi-LAT >50GeV catalog (2FHL)
Short Name:
J/ApJS/222/5
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a catalog of sources detected above 50GeV by the Fermi-Large Area Telescope (LAT) in 80 months of data. The newly delivered Pass 8 event-level analysis allows the detection and characterization of sources in the 50GeV-2TeV energy range. In this energy band, Fermi-LAT has detected 360 sources, which constitute the second catalog of hard Fermi-LAT sources (2FHL). The improved angular resolution enables the precise localization of point sources (~1.7' radius at 68% C. L.) and the detection and characterization of spatially extended sources. We find that 86% of the sources can be associated with counterparts at other wavelengths, of which the majority (75%) are active galactic nuclei and the rest (11%) are Galactic sources. Only 25% of the 2FHL sources have been previously detected by Cherenkov telescopes, implying that the 2FHL provides a reservoir of candidates to be followed up at very high energies. This work closes the energy gap between the observations performed at GeV energies by Fermi-LAT on orbit and the observations performed at higher energies by Cherenkov telescopes from the ground.
392. The second Konus-Wind short GRB catalog
ID:
ivo://CDS.VizieR/J/ApJS/224/10
Title:
The second Konus-Wind short GRB catalog
Short Name:
J/ApJS/224/10
Date:
21 Oct 2021
Publisher:
CDS
Description:
In this catalog, we present the results of a systematic study of 295 short gamma-ray bursts (GRBs) detected by Konus-Wind (KW) from 1994 to 2010. From the temporal and spectral analyses of the sample, we provide the burst durations, the spectral lags, the results of spectral fits with three model functions, the total energy fluences, and the peak energy fluxes of the bursts. We discuss evidence found for an additional power-law spectral component and the presence of extended emission in a fraction of the KW short GRBs. Finally, we consider the results obtained in the context of the Type I (merger-origin)/Type II (collapsar-origin) classifications.
393. The second Swift BAT GRB catalog (BAT2)
ID:
ivo://CDS.VizieR/J/ApJS/195/2
Title:
The second Swift BAT GRB catalog (BAT2)
Short Name:
J/ApJS/195/2
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the second Swift Burst Alert Telescope (BAT) catalog of gamma-ray bursts (GRBs), which contains 476 bursts detected by the BAT between 2004 December 19 and 2009 December 21. This catalog (hereafter the BAT2 catalog) presents burst trigger time, location, 90% error radius, duration, fluence, peak flux, time-averaged spectral parameters, and time-resolved spectral parameters measured by the BAT. In the correlation study of various observed parameters extracted from the BAT prompt emission data, we distinguish among long-duration GRBs (L-GRBs), short-duration GRBs (S-GRBs), and short-duration GRBs with extended emission (S-GRBs with E.E.) to investigate differences in the prompt emission properties. The fraction of L-GRBs, S-GRBs, and S-GRBs with E.E. in the catalog are 89%, 8%, and 2%, respectively. We compare the BAT prompt emission properties with the BATSE, BeppoSAX, and HETE-2 GRB samples. We also correlate the observed prompt emission properties with the redshifts for the GRBs with known redshift. The BAT T90 and T50 durations peak at 70s and 30s, respectively.
394. The SMM Atlas of Gamma-Ray flares
ID:
ivo://CDS.VizieR/J/ApJS/120/409
Title:
The SMM Atlas of Gamma-Ray flares
Short Name:
J/ApJS/120/409
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a compilation of data for all 258 gamma-ray flares detected above 300 keV by the Gamma Ray Spectrometer (GRS) aboard the Solar Maximum Mission satellite. This gamma-ray flare sample was collected during the period from 1980 February to 1989 November; covering the latter half of the 21st solar sunspot cycle and the onset of the 22d solar sunspot cycle. We describe the SMM/GRS instrument, its in-orbit operation, and the principal data reduction methods used to derive the gamma-ray flare properties. Utilizing measurements for 185 flares that were sufficiently intense to allow the derivation of gamma-ray spectra, we present an atlas of time profiles and gamma-ray spectra. The flare parameters derived from the gamma-ray spectra include bremsstrahlung fluence and best-fit power-law parameters, narrow nuclear line fluence, positron annihilation line fluence, neutron capture line fluence, and an indication of whether or not emissions greater than 10 MeV were present. Since a uniform methodology was adopted for deriving the parameters, this atlas should be very useful for future statistical and correlative studies of solar flares.
395. The 4th IBIS/ISGRI soft gamma-ray survey catalog
ID:
ivo://CDS.VizieR/J/ApJS/186/1
Title:
The 4th IBIS/ISGRI soft gamma-ray survey catalog
Short Name:
J/ApJS/186/1
Date:
21 Oct 2021
Publisher:
CDS
Description:
In this paper, we report on the fourth soft gamma-ray source catalog obtained with the IBIS gamma-ray imager on board the INTEGRAL satellite. The scientific data set is based on more than 70Ms of high-quality observations performed during the first five and a half years of the Core Program and public observations. Compared to previous IBIS surveys, this catalog includes a substantially increased coverage of extragalactic fields, and comprises more than 700 high-energy sources detected in the energy range 17-100keV, including both transients and faint persistent objects that can only be revealed with longer exposure times. A comparison is provided with the latest Swift/BAT survey results.
396. The third Fermi/GBM GRB catalog (6yr)
ID:
ivo://CDS.VizieR/J/ApJS/223/28
Title:
The third Fermi/GBM GRB catalog (6yr)
Short Name:
J/ApJS/223/28
Date:
21 Oct 2021
Publisher:
CDS
Description:
Since its launch in 2008, the Fermi Gamma-ray Burst Monitor (GBM) has triggered and located on average approximately two {gamma}-ray bursts (GRBs) every three days. Here, we present the third of a series of catalogs of GRBs detected by GBM, extending the second catalog by two more years through the middle of 2014 July. The resulting list includes 1405 triggers identified as GRBs. The intention of the GBM GRB catalog is to provide information to the community on the most important observables of the GBM-detected GRBs. For each GRB, the location and main characteristics of the prompt emission, the duration, peak flux, and fluence are derived. The latter two quantities are calculated for the 50-300keV energy band where the maximum energy release of GRBs in the instrument reference system is observed, and also for a broader energy band from 10 to 1000keV, exploiting the full energy range of GBM's low-energy [NaI[Tl)] detectors. Using statistical methods to assess clustering, we find that the hardness and duration of GRBs are better fit by a two-component model with short-hard and long-soft bursts than by a model with three components. Furthermore, information is provided on the settings and modifications of the triggering criteria and exceptional operational conditions during years five and six in the mission. This third catalog is an official product of the Fermi GBM science team, and the data files containing the complete results are available from the High-Energy Astrophysics Science Archive Research Center.
397. The third Fermi-LAT >10GeV catalog (3FHL)
ID:
ivo://CDS.VizieR/J/ApJS/232/18
Title:
The third Fermi-LAT >10GeV catalog (3FHL)
Short Name:
J/ApJS/232/18
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a catalog of sources detected above 10GeV by the Fermi Large Area Telescope (LAT) in the first 7 years of data using the Pass 8 event-level analysis. This is the Third Catalog of Hard Fermi-LAT Sources (3FHL), containing 1556 objects characterized in the 10GeV-2TeV energy range. The sensitivity and angular resolution are improved by factors of 3 and 2 relative to the previous LAT catalog at the same energies (1FHL). The vast majority of detected sources (79%) are associated with extragalactic counterparts at other wavelengths, including 16 sources located at very high redshift (z>2). Of the sources, 8% have Galactic counterparts and 13% are unassociated (or associated with a source of unknown nature). The high-latitude sky and the Galactic plane are observed with a flux sensitivity of 4.4 to 9.5x10^-11^ph/cm^2^/s, respectively (this is approximately 0.5% and 1% of the Crab Nebula flux above 10GeV). The catalog includes 214 new {gamma}-ray sources. The substantial increase in the number of photons (more than 4 times relative to 1FHL and 10 times to 2FHL) also allows us to measure significant spectral curvature for 32 sources and find flux variability for 163 of them. Furthermore, we estimate that for the same flux limit of 10^-12^erg/cm^2^/s, the energy range above 10GeV has twice as many sources as the range above 50GeV, highlighting the importance, for future Cherenkov telescopes, of lowering the energy threshold as much as possible.
398. The third Swift/BAT GRB catalog (past ~11yrs) (BAT3)
ID:
ivo://CDS.VizieR/J/ApJ/829/7
Title:
The third Swift/BAT GRB catalog (past ~11yrs) (BAT3)
Short Name:
J/ApJ/829/7
Date:
21 Oct 2021
Publisher:
CDS
Description:
To date, the Burst Alert Telescope (BAT) onboard Swift has detected ~1000 gamma-ray bursts (GRBs), of which ~360 GRBs have redshift measurements, ranging from z=0.03 to z=9.38. We present the analyses of the BAT-detected GRBs for the past ~11 years up through GRB151027B. We report summaries of both the temporal and spectral analyses of the GRB characteristics using event data (i.e., data for each photon within approximately 250s before and 950s after the BAT trigger time), and discuss the instrumental sensitivity and selection effects of GRB detections. We also explore the GRB properties with redshift when possible. The result summaries and data products are available at http://swift.gsfc.nasa.gov/results/batgrbcat/index.html. In addition, we perform searches for GRB emissions before or after the event data using the BAT survey data. We estimate the false detection rate to be only one false detection in this sample. There are 15 ultra-long GRBs (~2% of the BAT GRBs) in this search with confirmed emission beyond ~1000s of event data, and only two GRBs (GRB 100316D and GRB 101024A) with detections in the survey data prior to the starting of event data.
399. The 2WHSP catalog
ID:
ivo://CDS.VizieR/J/A+A/598/A17
Title:
The 2WHSP catalog
Short Name:
J/A+A/598/A17
Date:
04 Feb 2022 11:56:24
Publisher:
CDS
Description:
High Synchrotron Peaked blazars (HSPs) dominate the gamma sky at energies larger than a few GeV; however, only a few hundred blazars of this type have been catalogued so far. In this paper we present the 2WHSP sample, the largest and most complete list of HSP blazars available to date, which is an expansion of the 1WHSP catalog of gamma-ray source candidates off the Galactic plane. We cross-matched a number of multi-wavelength surveys (in the radio, infrared and X-ray bands) and applied selection criteria based on the radio to IR and IR to X-ray spectral slopes. To ensure the selection of genuine HSPs we examined the SED of each candidate and estimated the peak frequency of its synchrotron emission ({nu}_peak_) using the ASDC SED tool, including only sources with {nu}_peak_>10^15^Hz (equivalent to {nu}_peak_>4eV). We have assembled the largest and most complete catalog of HSP blazars to date, which includes 1691 sources. A number of population properties, such as infrared colours, synchrotron peak, redshift distributions, and gamma-ray spectral properties, have been used to characterise the sample and maximize completeness. We also derived the radio logN-logS distribution. This catalog has already been used to provide seeds to discover new very high energy objects within Fermi-LAT data and to look for the counterparts of neutrino and ultra high energy cosmic ray sources, showing its potential for the identification of promising high-energy gamma, sources and multi-messenger targets.
400. Third catalog of LAT-detected AGNs (3LAC)
ID:
ivo://CDS.VizieR/J/ApJ/810/14
Title:
Third catalog of LAT-detected AGNs (3LAC)
Short Name:
J/ApJ/810/14
Date:
21 Oct 2021
Publisher:
CDS
Description:
The third catalog of active galactic nuclei (AGNs) detected by the Fermi-LAT (3LAC) is presented. It is based on the third Fermi-LAT catalog (3FGL) of sources detected between 100MeV and 300GeV with a Test Statistic greater than 25, between 2008 August 4 and 2012 July 31. The 3LAC includes 1591 AGNs located at high Galactic latitudes (|b|>10{deg}), a 71% increase over the second catalog based on 2 years of data. There are 28 duplicate associations, thus 1563 of the 2192 high-latitude gamma-ray sources of the 3FGL catalog are AGNs. Most of them (98%) are blazars. About half of the newly detected blazars are of unknown type, i.e., they lack spectroscopic information of sufficient quality to determine the strength of their emission lines. Based on their gamma-ray spectral properties, these sources are evenly split between flat-spectrum radio quasars (FSRQs) and BL Lacs. The most abundant detected BL Lacs are of the high-synchrotron-peaked (HSP) type. About 50% of the BL Lacs have no measured redshifts. A few new rare outliers (HSP-FSRQs and high-luminosity HSP BL Lacs) are reported. The general properties of the 3LAC sample confirm previous findings from earlier catalogs. The fraction of 3LAC blazars in the total population of blazars listed in BZCAT remains non-negligible even at the faint ends of the BZCAT-blazar radio, optical, and X-ray flux distributions, which hints that even the faintest known blazars could eventually shine in gamma-rays at LAT-detection levels. The energy-flux distributions of the different blazar populations are in good agreement with extrapolation from earlier catalogs.