J/ApJ/756/44ivo://CDS.VizieR/J/ApJ/756/44doi:10.26093/cds/vizier.17560044CDSRipa J.Meszaros A.Veres P.Park I.H.2018-01-05T08:55:37Z2014-04-28T10:13:23ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgamma-ray-astronomyA sample of 427 gamma-ray bursts (GRBs) from a database (2002 February-2008 April) of the RHESSI satellite is analyzed statistically. The spectral lags and peak-count rates, which have been calculated for the first time in this paper, are studied, completing an earlier analysis of durations and hardness ratios. The analysis of the RHESSI database has already inferred the existence of a third group with intermediate duration, apart from the so-called short and long groups. The first aim of this article is to discuss the properties of these intermediate-duration bursts in terms of peak-count rates and spectral lags. The second aim is to discuss the number of GRB groups using another statistical method and by also employing the peak-count rates and spectral lags. The standard parametric (model-based clustering) and non-parametric (K-means clustering) statistical tests together with the Kolmogorov-Smirnov and Anderson-Darling tests are used. Two new results are obtained. (1) The intermediate-duration group has properties similar to those of the group of short bursts. Intermediate and long groups appear to be different. (2) The intermediate-duration GRBs in the RHESSI and Swift databases seem to be represented by different phenomena.2012ApJ...756...44Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/756/44CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/209/20 : Swift GRB catalog with X-ray data (Grupe+, 2013)J/ApJS/208/21 : The BATSE 5B GRB spectral catalog (Goldstein+, 2013)J/MNRAS/428/729 : GRB Swift X-ray light curves analysis (Margutti+, 2013)J/PASP/124/297 : GRB spectral lags (Li+, 2012)J/ApJ/746/170 : Follow-up resources for high-redshift GRBs (Morgan+, 2012)J/ApJ/731/103 : Redshift catalog for Swift long GRBs (Xiao+, 2011)J/ApJS/195/2 : The second Swift BAT GRB catalog (BAT2) (Sakamoto+, 2011)J/A+A/530/A21 : Spectral properties of 438 GRBs (Nava+, 2011)J/ApJ/715/1438 : Gravitational-wave bursts with GRBs (Abbott+, 2010)J/ApJ/711/495 : Durations of Swift/BAT GRBs (Butler+, 2010)J/ApJ/704/1405 : Testing the E_peak_-E_iso_ relation for GRBs (Krimm+, 2009)J/ApJ/701/824 : Afterglows of short & long-duration GRBs (Nysewander+, 2009)J/ApJ/690/163 : The first Swift UV-Opt GRB afterglow catalog (Roming+, 2009)J/A+A/498/399 : GRB observed with RHESSI satellite (Ripa+, 2009)J/MNRAS/397/1177 : Swift-XRT observations of GRBs (Evans+, 2009)J/ApJS/175/179 : The BAT1 gamma-ray burst catalog (Sakamoto+, 2008)J/ApJS/169/62 : GRB database of spectral lags (Hakkila+, 2007)J/ApJS/126/19 : BATSE gamma-ray burst spectral catalog. I. (Preece+, 2000)J/ApJ/508/314 : Gamma-ray bursts types (Mukherjee+, 1998)http://hesperia.gsfc.nasa.gov/rhessi2/ : RHESSI home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/756/44https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/756/44http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/756/44https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/756/44https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/756/44http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/756/44GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/756/44/table9 (The spectral lags and peak-count rates of the RHESSI {gamma}-ray bursts (GRBs))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/756/44/table9?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/756/44/table9?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/756/44/table9?GETtext/xml+votable180.050000true6/1102 1507 2044 2301 2796 3059 3301 3536 3700 3756 3795 3832 4808 5376 5493 5618 6004 6258 6319 6341 6552 7603 7766 7908 8375 9069 9100 9682 10680 11008 11908 12597 13189 13312 13694 13767 13924 14414 14859 14977 15004 15436 15513 15595 16232 16423 17594 17622 17733 18030 18911 19637 19883 19911 20030 20422 21515 22008 22590 23052 24002 24203 24219 24926 25452 25597 27222 27911 28187 28344 29231 29750 30471 30678 30886 31281 31667 32239 33323 33679 33735 35566 36528 38301 38577 38918 38926 39204 39206 39224 39268 39374 39630 39891 40433 41755 42654 42901 43272 43280 43397 43920 44052 44089 44342 45205 45548 45756 45938 46012 46016 46739 47027 47454 47618 47632 48054https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/756/44?format=asciiGamma-raydefaultJ/ApJ/756/44/table9The spectral lags and peak-count rates of the RHESSI {gamma}-ray bursts (GRBs)_RAPositions from SIMBAD (right ascension part)degpos.eq.ra;meta.mainnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGRBRHESSI GRB number (YYMMDDA)meta.id;meta.maincharGrGRB group assignment: 1=short, 2=intermediate, 3=longsrc.classintLag[-2347/6775]? Spectral lag (1)mstime;arith.difffloatnullableE_Lag? Upper uncertainty limit in Lag (1)msstat.error;stat.maxfloatnullablee_Lag? Lower uncertainty limit in Lag (1)msstat.errorfloatnullableFlux[149/135200] Peak 25-1500 keV count rates**-1phot.count;em.gamma.harddoublee_Flux[26/10874] The 1{sigma} statistical uncertainty in Fluxs**-1stat.error;phot.fluxfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_DEPositions from SIMBAD (declination part)degpos.eq.dec;meta.mainnullable