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 GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time: Mon Apr 6 14:07:38 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger633237
======================================================================
Trigger: 00633237 Segment: 000
BAT Trigger Time: 446967769.92 [s; MET]
Trigger Stop: 446967775.424 [s; MET]
UTC: 2015-03-02T05:42:36.665740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 175.508317651857 Dec: 36.8269551392691 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.58
Image Trigger?: NO
Rate S/N Ratio: 12.0415945787923 [ if not an image trigger ]
Image S/N Ratio: 6.58
Analysis Position: [ source = BAT ]
RA: 175.508317651857 Dec: 36.8269551392691 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 175.508 Dec: 36.827 [deg; J2000]
{ 11h 42m 01.9s , +36d 49' 37.2" }
+/- 2.58719266663 [arcmin] (estimated 90% radius based on SNR)
SNR: 7.82383728539
Angular difference between the analysis and refined position is 0.015491 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 23.8720000386238 +/- 8.72960939878939
Measured from: -0.312000036239624
to: 23.5600000023842 [s; relative to TRIGTIME]
T50: 8.7039999961853 +/- 5.52637311306892
Measured from: 3.20800000429153
to: 11.9120000004768 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.61199998855591
to: 3.61199998855591 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.14399999380112
to: 28.2319999933243 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.115092 0.206622 0.099345 0.063910
0.027687 0.029138 0.025836 0.024024 [error]
Peak 0.010252 0.022766 0.016347 0.004495
0.005252 0.005462 0.004973 0.004427 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 29.376 -1.144 28.232
T90 23.872 -0.312 23.560
T50 8.704 3.208 11.912
Peak 1.000 2.612 3.612
====== 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 -1.687 -0.336 0.316 - - - 9.45e-04 -2.01e-04 1.94e-04 60.890 57
CPL -0.934 -1.283 2.496 60.354 -42.190 -60.354 2.54e-03 -2.54e-03 7.67e-02 60.180 56
=== 1-s peak 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 -1.333 -0.518 0.513 - - - 3.33e-03 -1.03e-03 1.02e-03 57.320 57
CPL -0.571 -1.214 2.472 95.587 -95.587 -95.587 8.00e-03 -8.00e-03 1.12e-01 56.760 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 4.22e-08 6.93e-08 8.61e-08 2.12e-07 2.57e-07 4.10e-07 erg/cm2
90%_error_low -1.09e-08 -1.24e-08 -2.42e-08 -9.97e-08 -5.63e-08 -1.28e-07 erg/cm2
90%_error_hi 1.14e-08 1.24e-08 2.46e-08 1.46e-07 5.84e-08 1.67e-07 erg/cm2
Peak flux PL 1.17e-01 1.30e-01 1.03e-01 1.35e-01 4.00e-01 4.85e-01 ph/cm2/s
90%_error_low -5.51e-02 -4.28e-02 -3.88e-02 -8.01e-02 -1.22e-01 -1.52e-01 ph/cm2/s
90%_error_hi 6.32e-02 4.18e-02 3.83e-02 1.29e-01 1.22e-01 1.59e-01 ph/cm2/s
Fluence CPL 3.95e-08 7.60e-08 8.39e-08 6.14e-08 2.35e-07 2.61e-07 erg/cm2
90%_error_low -1.27e-08 -9.04e-09 -3.50e-08 N/A -6.72e-08 -9.22e-08 erg/cm2
90%_error_hi 1.27e-08 2.05e-08 2.74e-08 N/A 7.13e-08 2.02e-07 erg/cm2
Peak flux CPL 1.02e-01 1.39e-01 1.10e-01 6.31e-02 3.90e-01 4.14e-01 ph/cm2/s
90%_error_low -6.44e-02 -4.81e-02 -4.39e-02 -6.31e-02 -1.23e-01 -1.42e-01 ph/cm2/s
90%_error_hi 7.12e-02 5.19e-02 4.64e-02 1.09e-01 1.24e-01 1.65e-01 ph/cm2/s
======================================================================
Image
Pre-slew 25.0-100.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 175.508 36.827 0.000 12.386 172.636 0.140 7.824 TRIG_00633237 Image time interval: 0.000 to 5.504 [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.
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 -1.144 sec. to 28.232 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.68664 ( -0.336293 0.316028 ) Norm@50keV : 9.44654E-04 ( -0.000200596 0.000194288 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.89 using 59 PHA bins. # Reduced chi-squared = 1.068 for 57 degrees of freedom # Null hypothesis probability = 3.376636e-01 Photon flux (15-150 keV) in 29.38 sec: 0.124886 ( -0.022431 0.022431 ) ph/cm2/s Energy fluence (15-150 keV) : 2.57283e-07 ( -5.63129e-08 5.83857e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.144 sec. to 28.232 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.934219 ( -1.28329 2.49556 ) Epeak [keV] : 60.3538 ( -42.1778 -60.3416 ) Norm@50keV : 2.53821E-03 ( -0.00253983 0.0767081 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.18 using 59 PHA bins. # Reduced chi-squared = 1.075 for 56 degrees of freedom # Null hypothesis probability = 3.270028e-01 Photon flux (15-150 keV) in 29.38 sec: 0.121178 ( -0.0239293 0.02365 ) ph/cm2/s Energy fluence (15-150 keV) : 2.35311e-07 ( -6.71862e-08 7.13382e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.612 sec. to 3.612 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.33317 ( -0.518051 0.51285 ) Norm@50keV : 3.32997E-03 ( -0.00103035 0.00102041 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.32 using 59 PHA bins. # Reduced chi-squared = 1.006 for 57 degrees of freedom # Null hypothesis probability = 4.633216e-01 Photon flux (15-150 keV) in 1 sec: 0.399806 ( -0.121616 0.121841 ) ph/cm2/s Energy fluence (15-150 keV) : 3.26528e-08 ( -1.11111e-08 1.14992e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.612 sec. to 3.612 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.570756 ( -1.20787 2.47772 ) Epeak [keV] : 95.5869 ( -95.868 -95.868 ) Norm@50keV : 7.99986E-03 ( -0.00796001 0.111948 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.76 using 59 PHA bins. # Reduced chi-squared = 1.013 for 56 degrees of freedom # Null hypothesis probability = 4.466706e-01 Photon flux (15-150 keV) in 1 sec: 0.389624 ( -0.123302 0.123895 ) ph/cm2/s Energy fluence (15-150 keV) : 3.10749e-08 ( -1.15108e-08 1.20601e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 23.872 sec. Hardness ratio (energy fluence ratio) = 1.24262508434
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.1149543e-07 S(50-150 keV) = 1.4578906e-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
IMX = -0.217792366346, IMY = -0.0281479751109
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -60.920000 -1.144000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] [']
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.144000 28.232000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 193.8202 4.7005 2.6 26.9 40.9 0.3615 4.5 ------ UNKNOWN 211.3629 6.5723 2.6 32.4 6.7 0.3693 4.5 ------ UNKNOWN 175.5154 36.8517 1.7 12.4 172.8 0.4590 6.9 ------ UNKNOWN 236.1919 9.3957 2.0 49.0 -22.2 0.8841 5.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 89.980660 112.780600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 97.2303 47.5546 2.2 56.5 -166.8 1.0096 5.2 ------ UNKNOWN 102.0197 64.1978 2.2 50.3 -147.3 0.7304 5.2 ------ UNKNOWN