Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
==========================================================================
BAT GROUND-DETECTED GRB DATA PROCESSING REPORT
(This burst occurred during telescope slew)
Process Script Ver: batgrbproduct v2.46
Process Start Time: Fri Nov 7 15:08:14 EST 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/GRB080130
======================================================================
Trigger: 00074372 Segment: 007
BAT Trigger Time: 223384438.4
UTC: 2008-01-30T11:13:55.861 [includes UTCF correction]
Where From?: Ground analysis (best_duration.txt)
NOTE: BAT trigger time for ground-detected burst during slew is the T100 start time.
Analysis Position: [ source = BAT ]
RA: 261.61657 Dec: -53.18878 [deg; J2000]
Refined Position: [ source = BAT non-slew period ]
RA: 261.642329404253 Dec: -53.1925480515856 [deg; J2000]
{ 17h 26m 34.2s , -53d 11' 33.2" }
+/- 2.14373022648928 [arcmin] (estimated 90% radius based on SNR)
+/- 1.10657714767263 [arcmin] (formal 1-sigma fit error)
SNR: 10.2333585773884
Angular difference between the analysis and refined position is 0.953230 arcmin
Partial Coding Fraction: Unavailable because the burst occurred during slew.
Duration
T90: 60.8000000417233 +/- 1.6
Measured from: 3.2
to: 64 [s; relative to TRIGTIME]
T50: 35.2000000178814 +/- 1.6
Measured from: 16
to: 51.2 [s; relative to TRIGTIME]
====== Table of the duration information =============================
Value tstart tstop
T100 67.200 0.000 67.200
T90 60.800 3.200 64.000
T50 35.200 16.000 51.200
Peak 1.000 45.100 46.100
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_index}
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.207 -0.173 0.176 - - - 1.23e-03 -1.21e-04 1.21e-04 56.120 57
CPL -0.676 -0.604 0.836 135.290 -52.453 -135.290 2.18e-03 -1.01e-03 2.96e-03 54.470 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.333 -0.698 0.760 - - - 3.12e-03 -1.01e-03 9.78e-04 66.790 57
CPL -1.381 -2.310 0.508 9999.360 N/A N/A 3.11e-03 N/A N/A 66.820 56
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence PL 8.04e-08 1.77e-07 3.06e-07 1.23e-06 8.38e-07 1.80e-06 erg/cm2
90%_error_low -1.50e-08 -2.04e-08 -3.54e-08 -2.93e-07 -8.95e-08 -3.17e-07 erg/cm2
90%_error_hi 1.60e-08 2.01e-08 3.51e-08 3.54e-07 9.01e-08 3.69e-07 erg/cm2
Peak flux PL 1.09e-01 1.22e-01 9.66e-02 1.27e-01 3.75e-01 4.54e-01 ph/cm2/s
90%_error_low -1.09e-01 -4.90e-02 -4.14e-02 -8.68e-02 -1.20e-01 -1.47e-01 ph/cm2/s
90%_error_hi 7.79e-02 4.29e-02 3.85e-02 1.83e-01 1.21e-01 1.60e-01 ph/cm2/s
Fluence CPL 7.15e-08 1.84e-07 3.20e-07 6.13e-07 8.08e-07 1.19e-06 erg/cm2
90%_error_low -1.89e-08 -2.29e-08 -4.01e-08 -3.42e-07 -9.96e-08 -3.53e-07 erg/cm2
90%_error_hi 1.95e-08 2.35e-08 4.12e-08 7.27e-07 9.89e-08 7.31e-07 erg/cm2
Peak flux CPL 8.83e-02 6.84e-02 3.77e-02 3.55e-02 2.08e-01 2.29e-01 ph/cm2/s
90%_error_low -8.83e-02 -6.84e-02 -3.77e-02 -3.55e-02 -2.08e-01 -2.29e-01 ph/cm2/s
90%_error_hi 5.58e-02 2.83e-02 2.52e-02 1.53e-02 7.70e-02 1.69e-01 ph/cm2/s
======================================================================
Image
15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 261.6423 -53.1925 0.0188 12.1 163.0 0.6904 10.2 TRIG_00074372 ------------------------------------------ Image time interval: 42.501 to 67.200 [sec]
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Best duration plot
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from 0.000 sec. to 67.200 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.2066 ( -0.172663 0.176171 ) Norm@50keV : 1.23197E-03 ( -0.000120636 0.000120576 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.12 using 59 PHA bins. # Reduced chi-squared = 0.9846 for 57 degrees of freedom # Null hypothesis probability = 5.080599e-01 Photon flux (15-150 keV) in 67.2 sec: 0.144745 ( -0.014763 0.014813 ) ph/cm2/s Energy fluence (15-150 keV) : 8.38454e-07 ( -8.94587e-08 9.01468e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 67.200 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.676179 ( -0.603852 0.83648 ) Epeak [keV] : 135.290 ( -52.453 -135.29 ) Norm@50keV : 2.17884E-03 ( -0.00101228 0.0029647 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.47 using 59 PHA bins. # Reduced chi-squared = 0.9726 for 56 degrees of freedom # Null hypothesis probability = 5.331319e-01 Photon flux (15-150 keV) in 67.2 sec: 0.140810 ( -0.015783 0.015682 ) ph/cm2/s Energy fluence (15-150 keV) : 8.08329e-07 ( -9.95521e-08 9.88633e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 45.100 sec. to 46.100 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.33275 ( -0.698633 0.759588 ) Norm@50keV : 3.12031E-03 ( -0.00101044 0.000977442 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.79 using 59 PHA bins. # Reduced chi-squared = 1.172 for 57 degrees of freedom # Null hypothesis probability = 1.759211e-01 Photon flux (15-150 keV) in 1 sec: 0.374588 ( -0.120435 0.120691 ) ph/cm2/s Energy fluence (15-150 keV) : 3.06027e-08 ( -1.11392e-08 1.15621e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 45.100 sec. to 46.100 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -3.37122 ( -0.332495 2.48573 ) Epeak [keV] : 358.355 ( ) Norm@50keV : 3.30445E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.02 using 59 PHA bins. # Reduced chi-squared = 1.161 for 56 degrees of freedom # Null hypothesis probability = 1.914820e-01 Photon flux (15-150 keV) in 1 sec: 0.207930 ( -0.20793 0.076997 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 60.8 sec. Hardness ratio (energy fluence ratio) = 1.7331650103
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.5716281e-07 S(50-150 keV) = 5.812999e-07
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
Mask shadow pattern unavailable because this burst occurs during telescope slews.Spacecraft aspect plot
