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: Sat Mar 28 18:22:36 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/GRB150204A
======================================================================
Trigger: 00084702 Segment: 002
BAT Trigger Time: 444724275.001
UTC: 2015-02-04T06:31:01.860 [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.
Refined Position: [ source = BAT mosaic image ]
RA: 160.275031221435 Dec: -64.043129166788 [deg; J2000]
{ 10h 41m 06.0s , -64d -2' -35.3" }
+/- 1.05407795563 [arcmin] (estimated 90% radius based on SNR)
SNR: 28.2162872478
Angular difference between the analysis and refined position is Usage: arcmin
Partial Coding Fraction: Unavailable because the burst occurred during slew.
Duration
T90: 14. +/- 2.23606797749979
Measured from: 1
to: 15 [s; relative to TRIGTIME]
T50: 4. +/- 1.4142135623731
Measured from: 5
to: 9 [s; relative to TRIGTIME]
====== Table of the duration information =============================
Value tstart tstop
T100 19.000 0.000 19.000
T90 14.000 1.000 15.000
T50 4.000 5.000 9.000
Peak 1.000 6.000 7.000
====== 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 -1.610 -0.106 0.105 - - - 4.95e-03 -2.92e-04 2.91e-04 46.880 57
CPL -1.549 -0.161 0.355 367.607 -367.607 -367.607 5.32e-03 -1.43e-03 2.60e-03 46.920 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
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 -1.506 -0.152 0.150 - - - 1.48e-02 -1.41e-03 1.41e-03 67.230 57
CPL -0.358 -0.673 0.786 72.007 -12.589 32.885 5.56e-02 -2.95e-02 7.79e-02 57.940 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 1.33e-07 2.29e-07 3.00e-07 7.98e-07 8.79e-07 1.46e-06 erg/cm2
90%_error_low -1.31e-08 -1.36e-08 -2.36e-08 -1.28e-07 -5.55e-08 -1.47e-07 erg/cm2
90%_error_hi 1.35e-08 1.36e-08 2.35e-08 1.44e-07 5.58e-08 1.60e-07 erg/cm2
Peak flux PL 6.11e-01 6.13e-01 4.32e-01 4.82e-01 1.85e+00 2.14e+00 ph/cm2/s
90%_error_low -9.11e-02 -6.02e-02 -5.08e-02 -1.04e-01 -1.74e-01 -2.01e-01 ph/cm2/s
90%_error_hi 9.50e-02 5.99e-02 5.05e-02 1.19e-01 1.74e-01 2.02e-01 ph/cm2/s
Fluence CPL 1.33e-07 2.29e-07 3.00e-07 7.93e-07 8.78e-07 1.44e-06 erg/cm2
90%_error_low -1.55e-08 -1.38e-08 -2.24e-08 -3.70e-07 -6.20e-08 -3.68e-07 erg/cm2
90%_error_hi 1.11e-08 1.62e-08 2.47e-08 8.87e-08 5.66e-08 1.73e-07 erg/cm2
Peak flux CPL 4.95e-01 6.78e-01 4.74e-01 1.73e-01 1.77e+00 1.82e+00 ph/cm2/s
90%_error_low -1.11e-01 -7.34e-02 -6.03e-02 -7.70e-02 -1.80e-01 -1.99e-01 ph/cm2/s
90%_error_hi 1.14e-01 7.53e-02 6.15e-02 1.32e-01 1.80e-01 2.14e-01 ph/cm2/s
======================================================================
Image
Note1: The mosaic image is made with timebin = 0.10 s; energybin = 15-350 keV
Note2: The mosaic image uses Galactic coordinate.
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 160.275 -64.043 0.002 18.970 13.971 0.063 28.216 UNKNOWN Image time interval: 0.000 to 19.000 [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 19.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.61012 ( -0.10579 0.10497 ) Norm@50keV : 4.95371E-03 ( -0.000291834 0.000290503 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.88 using 59 PHA bins. # Reduced chi-squared = 0.8224 for 57 degrees of freedom # Null hypothesis probability = 8.282827e-01 Photon flux (15-150 keV) in 19 sec: 0.638608 ( -0.037497 0.037595 ) ph/cm2/s Energy fluence (15-150 keV) : 8.79293e-07 ( -5.54899e-08 5.584e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 19.000 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.60813 ( -0.156697 0.359049 ) Epeak [keV] : 9947.80 ( -9229.63 -9229.63 ) Norm@50keV : 4.96562E-03 ( -0.00107244 0.00295013 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.88 using 59 PHA bins. # Reduced chi-squared = 0.8371 for 56 degrees of freedom # Null hypothesis probability = 8.023376e-01 Photon flux (15-150 keV) in 19 sec: 0.638289 ( -0.039993 0.037779 ) ph/cm2/s Energy fluence (15-150 keV) : 8.78058e-07 ( -6.20143e-08 5.66445e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 6.000 sec. to 7.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.506 ( -0.152011 0.150004 ) Norm@50keV : 1.47640E-02 ( -0.00141149 0.00140542 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 67.23 using 59 PHA bins. # Reduced chi-squared = 1.179 for 57 degrees of freedom # Null hypothesis probability = 1.666258e-01 Photon flux (15-150 keV) in 1 sec: 1.84616 ( -0.17388 0.17406 ) ph/cm2/s Energy fluence (15-150 keV) : 1.39943e-07 ( -1.44787e-08 1.45896e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.000 sec. to 7.000 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.357834 ( -0.672622 0.785879 ) Epeak [keV] : 72.0074 ( -12.589 32.8845 ) Norm@50keV : 5.56208E-02 ( -0.0295145 0.077921 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.94 using 59 PHA bins. # Reduced chi-squared = 1.035 for 56 degrees of freedom # Null hypothesis probability = 4.035353e-01 Photon flux (15-150 keV) in 1 sec: 1.77102 ( -0.17968 0.17968 ) ph/cm2/s Energy fluence (15-150 keV) : 1.31018e-07 ( -1.51056e-08 1.5412e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 14.0 sec. Hardness ratio (energy fluence ratio) = 1.31032743436
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.622567e-07 S(50-150 keV) = 5.170301e-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
