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J/ApJ/704/1405     Testing the Epeak-Eiso relation for GRBs   (Krimm+, 2009)

Testing the Epeak-Eiso relation for GRBs detected by Swift and Suzaku-WAM. Krimm H.A., Yamaoka K., Sugita S., Ohno M., Sakamoto T., Barthelmy S.D., Gehrels N., Hara R., Norris J.P., Ohmori N., Onda K., Sato G., Tanaka H., Tashiro M., Yamauchi M. <Astrophys. J., 704, 1405-1432 (2009)> =2009ApJ...704.1405K
ADC_Keywords: Gamma rays ; Models ; Redshifts Keywords: gamma rays: bursts Abstract: One of the most prominent, yet controversial associations derived from the ensemble of prompt-phase observations of gamma-ray bursts (GRBs) is the apparent correlation in the source frame between the peak energy (Epeak) of the νF(ν) spectrum and the isotropic radiated energy, Eiso. Since most GRBs have Epeak above the energy range (15-150keV) of the Burst Alert Telescope (BAT) on Swift, determining accurate Epeak values for large numbers of Swift bursts has been difficult. However, by combining data from Swift/BAT and the Suzaku Wide-band All-Sky Monitor (WAM), which covers the energy range from 50 to 5000keV, for bursts which are simultaneously detected, one can accurately fit Epeak and Eiso and test the relationship between them for the Swift sample. Between the launch of Suzaku in 2005 July and the end of 2009 April, there were 48 GRBs that triggered both Swift/BAT and WAM, and an additional 48 bursts that triggered Swift and were detected by WAM, but did not trigger. A BAT-WAM team has cross-calibrated the two instruments using GRBs, and we are now able to perform joint fits on these bursts to determine their spectral parameters. For those bursts with spectroscopic redshifts, we can also calculate the isotropic energy. Here, we present the results of joint Swift/BAT-Suzaku/WAM spectral fits for 91 of the bursts detected by the two instruments. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 92 91 General properties of BAT/WAM bursts table2.dat 114 192 Time-integrated spectral parameters of BAT/WAM bursts table3.dat 70 24 Spectral parameters for BAT/WAM bursts fitted only by a power-law model table4.dat 61 66 Fluence values for BAT/WAM bursts table5.dat 104 432 Time-resolved spectral parameters of BAT/WAM bursts refs.dat 40 67 References
See also: IX/36 : GRANAT/PHEBUS catalog of cosmic gamma-ray bursts (Terekhov+, 1994-2002) J/ApJS/195/2 : The second Swift BAT GRB catalog (BAT2) (Sakamoto+, 2011) J/A+A/525/A53 : GBM parameters for detected FERMI bursts (Guetta+, 2011) J/MNRAS/407/2075 : Gamma-ray bursts spectral peak estimator (Shahmoradi+, 2010) J/PAZh/35/10 : Gamma-ray bursts with known redshifts (Badjin+, 2009) J/ApJS/175/179 : The BAT1 gamma-ray burst catalog (Sakamoto+, 2008) J/other/APh/26.367 : GRB from RICE data (Besson+, 2007) J/ApJS/169/62 : GRB database of spectral lags (Hakkila+, 2007) J/ApJS/166/298 : Spectral catalog of bright BATSE gamma-ray bursts (Kaneko+ 2006) J/ApJ/609/935 : Gamma-ray burst formation rate (Yonetoku+, 2004) J/ApJS/134/385 : Supplement to the BATSE gamma-ray burst catalogs (Kommers+ 2001) J/ApJS/126/19 : BATSE gamma-ray burst spectral catalog. I. (Preece+, 2000) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 7 A7 --- GRB GRB designation (YYMMDDA) 9- 13 F5.1 s T90 Values of T90 are from Sakamoto et al. (2008, Cat. J/ApJS/175/179) unless otherwise indicated 15- 16 I2 --- r_T90 ? Other reference for T90 (see refs.dat file) 17 A1 --- f_T90 [S] S: short burst 19- 24 F6.4 --- z ? Redshift 26- 27 I2 --- r_z ? Redshift reference (see refs.dat file) 29 A1 --- f_Trig [u] u: untrig 30- 35 I6 --- Trig ? BAT trigger number 37 A1 --- f_TrigW [u] u: untrig 38- 41 I4 --- TrigW ? WAM trigger number 43- 44 I2 --- Det WAM detector number (1) 45 A1 --- f_Det [c-g] only one side of WAM detectors used (2) 47- 53 F7.2 s ti.0 ? Total burst interval, start (3) 54 A1 --- --- [-] 55- 60 F6.2 s ti.1 ? Total burst interval, end (3) 62- 65 A4 --- f_ti.1 [sl,h ] Total burst peculiarity (4) 67- 73 F7.2 s si.0 ? Segment interval, start (3) 74 A1 --- --- [-] 75- 80 F6.2 s si.1 ? Segment interval, end (3) 81- 82 A2 --- f_si.1 [sl] Burst segment peculiarity (4) 85- 91 A7 --- Seg Segment: portion of the burst used for the time- integrated spectral fit 92 A1 --- f_Seg [d] precursor to main burst (5)
Note (1): "WAM dets": the identifier of the WAM detector or a pair of detectors in which the burst was detected; cases where only one of a pair was used in the fits are noted. Note (2): Flag on Det as follows: c = Only WAM side 0 used for fits. e = Only WAM side 3 used for fits. f = Only WAM side 1 used for fits. g = Only WAM side 2 used for fits. Note (3): Total interval and Segment interval: times are with respect to the Swift/BAT trigger time. Time-resolved burst segments Note (4): Flag as follows: h = This burst did not trigger BAT, but was discovered as part of the BAT slew survey. For this burst, T0 is the start of the spacecraft slew. sl = The time interval included all or part of a spacecraft slew maneuver. Note (5): d = BAT triggered on a precursor to the main burst. Analysis was done using BAT survey ("dph") data.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 7 A7 --- GRB GRB designation (YYMMDDA) 9 A1 --- f_GRB [a] Flag for GRB 080218A (1) 11- 15 F5.2 --- alpha Photon spectral index alpha (2) 17- 20 F4.2 --- e_alpha alpha uncertainty 22- 26 F5.2 --- beta ? 2d photon spectral index beta (2) 28- 32 F5.2 --- E_beta ? Positive error in beta 34- 37 F4.2 --- e_beta ? Negative error in beta 39- 42 I4 keV Epk ? Energy peak E_peak_ (2) 44- 47 I4 keV E_Epk ? Positive error in Epk 49- 51 I3 keV e_Epk ? Negative error in Epk 53- 59 F7.3 10+45J Eiso ? Isotropic energy (in 1052erg) 61- 66 F6.3 10+45J e_Eiso ? Eiso uncertainty 68- 71 F4.2 --- WAMA WAM A norm: dimensionless constant C (2) 73- 77 F5.2 --- E_WAMA Positive error in WAM A 79- 82 F4.2 --- e_WAMA Negative error in WAM A 84- 87 F4.2 --- WAMB ? WAM B norm: dimensionless constant C (2) 89- 92 F4.2 --- E_WAMB ? Positive error in WAM B 94- 97 F4.2 --- e_WAMB ? Negative error in WAM B 99-104 F6.2 --- chi2 χ2 test 106-108 I3 --- dof Degree of freedom 110-113 A4 --- Mod Model (G1) 114 A1 --- f_Mod [*] *: best-fit model (by Δχ2 test)
Note (1): a = Since the WAM normalization is anomalously large, we quote fit parameters derived from the BAT data alone for this burst. Note (2): The two-component model (Band et al., 1993ApJ...413..281B) is defined in section 2 with β, a second photon spectral index for the higher energy E>Ec where Ec=(α-β)Epeak/(2+α).
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 7 A7 --- GRB GRB designation (YYMMDDA) 9- 13 F5.2 --- alpha Photon spectral index 15- 18 F4.2 --- e_alpha alpha uncertainty 20- 22 I3 keV Epk ? Energy peak (1) 24- 26 I3 keV E_Epk ? Positive error on Epeak 28- 30 I3 keV e_Epk ? Negative error on Epeak 31 A1 --- f_Epk [a] a: this burst has a fit Epeak from Sakamoto, 2008ApJS..175..179S 33- 36 F4.2 --- WAMA WAM A norm: dimensionless constant C 38- 41 F4.2 --- E_WAMA Positive error in WAM A 43- 46 F4.2 --- e_WAMA Negative error in WAM A 48- 51 F4.2 --- WAMB ? WAM B norm: dimensionless constant C 53- 56 F4.2 --- E_WAMB ? Positive error in WAM B 58- 61 F4.2 --- e_WAMB ? Negative error in WAM B 63- 67 F5.2 --- chi2 χ2 test 69- 70 I2 --- dof Degrees of freedom
Note (1): For all bursts except those noted, Epeak values are estimated from the Sakamoto et al. (2009ApJ...693..922S) α-Epeak relation.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 7 A7 --- GRB GRB designation (YYMMDDA) 9- 13 F5.2 nJ/m2 Flu1 15-150keV energy fluence (in 10-6erg/cm2) 15- 18 F4.2 nJ/m2 E_Flu1 Flu1 positive uncertainty 20- 23 F4.2 nJ/m2 e_Flu1 Flu1 negative uncertainty 25- 29 F5.1 nJ/m2 Flu2 15-2000keV energy fluence (in 10-6erg/cm2) 31- 35 F5.2 nJ/m2 E_Flu2 Flu2 positive uncertainty 37- 41 F5.2 nJ/m2 e_Flu2 Flu2 negative uncertainty 43- 47 F5.1 nJ/m2 Flu3 1-10000keV energy fluence (in 10-6erg/cm2) 49- 54 F6.2 nJ/m2 E_Flu3 Flu3 positive uncertainty 56- 61 F6.2 nJ/m2 e_Flu3 Flu3 negative uncertainty
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 7 A7 --- GRB GRB name (YYMMDDA) 9- 16 A8 --- Seq Sequence 18- 30 A13 --- Int Interval: times are with respect to the Swift/BAT trigger 31- 32 A2 --- f_Int [sl] 34- 38 F5.2 --- alpha Spectral photon index α 40- 43 F4.2 --- e_alpha alpha uncertainty 45- 49 F5.2 --- beta ? Spectral photon index β 51- 55 F5.2 --- E_beta ? Positive error in beta 57- 60 F4.2 --- e_beta ? Negative error in beta 62- 65 I4 keV Epk ? Energy peak 67- 70 I4 keV E_Epk ? Positive error in Epeak 72- 75 I4 keV e_Epk ? Negative error in Epeak 77- 81 F5.2 10+45J Eiso ? Isotropic energy (in 1052ergs units) 83- 87 F5.2 10+45J e_Eiso ? Eiso uncertainty 89- 94 F6.2 --- chi2 χ2 test 96- 98 I3 --- dof Degree of freedom 100-103 A4 --- Mod Model (G1) 104 A1 --- f_Mod [*] best-fit model (by the Δχ2 test)
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference number 4- 22 A19 --- BibCode Bibcode 24- 40 A17 --- Aut First author's name
Global notes: Note (G1): For each time interval, joint fits were made to the BAT and WAM data. Data were fit using xspec11.3 to a simple power-law (PL) model, a power-law model with an exponential cutoff (CPL), and the two-component (Band) model (Band et al. 1993ApJ...413..281B). See section 2 for further details.
History: From electronic version of the journal
(End) Emmanuelle Perret [CDS] 24-Nov-2011
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