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: Wed Feb 11 07:43:34 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger627137
======================================================================
Trigger: 00627137 Segment: 000
BAT Trigger Time: 443415479.488 [s; MET]
Trigger Stop: 443415479.744 [s; MET]
UTC: 2015-01-20T02:57:46.413400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 10.3079848360545 Dec: 33.9812565264564 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.25
Image Trigger?: NO
Rate S/N Ratio: 16.1554944214035 [ if not an image trigger ]
Image S/N Ratio: 7.25
Analysis Position: [ source = BAT ]
RA: 10.3079848360545 Dec: 33.9812565264564 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 10.3286724302852 Dec: 33.9801583936293 [deg; J2000]
{ 00h 41m 18.9s , +33d 58' 48.6" }
+/- 1.51256016579608 [arcmin] (estimated 90% radius based on SNR)
+/- 0.644721664444355 [arcmin] (formal 1-sigma fit error)
SNR: 16.8417032281939
Angular difference between the analysis and refined position is 1.031388 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 1.19599992036819 +/- 0.153674948708428
Measured from: -0.311999976634979
to: 0.883999943733215 [s; relative to TRIGTIME]
T50: 0.559999942779541 +/- 0.11207141806269
Measured from: 0.0320000052452087
to: 0.59199994802475 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0639999508857727
to: 0.936000049114227 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.403999984264374
to: 0.952000021934509 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.083572 0.091116 0.062003 0.004866
0.007757 0.007979 0.007163 0.005841 [error]
Peak 0.067195 0.073615 0.052034 0.001745
0.006792 0.007060 0.006342 0.005051 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 1.356 -0.404 0.952
T90 1.196 -0.312 0.884
T50 0.560 0.032 0.592
Peak 1.000 -0.064 0.936
====== 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 -1.810 -0.182 0.176 - - - 1.16e-02 -1.29e-03 1.27e-03 47.090 57
CPL -1.814 -0.230 0.600 9999.360 N/A N/A 1.15e-02 N/A N/A 47.090 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 -1.794 -0.192 0.185 - - - 1.29e-02 -1.54e-03 1.50e-03 42.240 57
CPL -1.797 -0.189 0.650 9999.360 -9999.350 -9999.360 1.28e-02 -6.27e-03 1.60e-02 42.240 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 2.68e-08 4.08e-08 4.65e-08 1.01e-07 1.44e-07 2.15e-07 erg/cm2
90%_error_low -3.84e-09 -3.84e-09 -7.09e-09 -2.84e-08 -1.63e-08 -3.59e-08 erg/cm2
90%_error_hi 3.94e-09 3.85e-09 7.14e-09 3.50e-08 1.65e-08 4.12e-08 erg/cm2
Peak flux PL 7.02e-01 5.94e-01 3.43e-01 2.94e-01 1.77e+00 1.93e+00 ph/cm2/s
90%_error_low -1.09e-01 -6.05e-02 -5.38e-02 -8.20e-02 -1.80e-01 -1.98e-01 ph/cm2/s
90%_error_hi 1.12e-01 6.04e-02 5.38e-02 9.93e-02 1.80e-01 1.99e-01 ph/cm2/s
Fluence CPL 2.69e-08 4.06e-08 4.65e-08 1.03e-07 1.45e-07 2.16e-07 erg/cm2
90%_error_low -4.14e-09 -3.65e-09 -7.43e-09 -5.31e-08 -1.91e-08 -6.92e-08 erg/cm2
90%_error_hi 3.99e-09 2.62e-09 7.52e-09 1.85e-08 1.66e-08 2.07e-08 erg/cm2
Peak flux CPL 7.05e-01 5.93e-01 3.42e-01 2.98e-01 1.77e+00 1.93e+00 ph/cm2/s
90%_error_low -1.13e-01 -5.95e-02 -5.28e-02 N/A -1.84e-01 -2.64e-01 ph/cm2/s
90%_error_hi 1.12e-01 6.63e-02 5.50e-02 N/A 1.80e-01 1.95e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 10.3287 33.9802 0.0114 29.6482 -143.7181 0.2466740 16.842 TRIG_00627137 Foreground time interval of the image: -0.404 0.952 (delta_t = 1.356 [sec]) Background time interval of the image: -239.488 -0.404 (delta_t = 239.084 [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 -0.404 sec. to 0.952 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.81034 ( -0.181887 0.175711 ) Norm@50keV : 1.15570E-02 ( -0.0012939 0.00126674 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.09 using 59 PHA bins. # Reduced chi-squared = 0.8261 for 57 degrees of freedom # Null hypothesis probability = 8.225449e-01 Photon flux (15-150 keV) in 1.356 sec: 1.59905 ( -0.15213 0.15222 ) ph/cm2/s Energy fluence (15-150 keV) : 1.44245e-07 ( -1.62534e-08 1.6505e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.404 sec. to 0.952 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.81367 ( -0.231553 0.598642 ) Epeak [keV] : 9999.36 ( ) Norm@50keV : 1.15426E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.09 using 59 PHA bins. # Reduced chi-squared = 0.8409 for 56 degrees of freedom # Null hypothesis probability = 7.960353e-01 Photon flux (15-150 keV) in 1.356 sec: 1.60155 ( -0.16008 0.15262 ) ph/cm2/s Energy fluence (15-150 keV) : 1.44757e-07 ( -1.90761e-08 1.66044e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.064 sec. to 0.936 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.79356 ( -0.19248 0.185342 ) Norm@50keV : 1.28511E-02 ( -0.00153735 0.00150326 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 42.24 using 59 PHA bins. # Reduced chi-squared = 0.7411 for 57 degrees of freedom # Null hypothesis probability = 9.278323e-01 Photon flux (15-150 keV) in 1 sec: 1.76654 ( -0.17987 0.17996 ) ph/cm2/s Energy fluence (15-150 keV) : 1.18353e-07 ( -1.43179e-08 1.45455e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.064 sec. to 0.936 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.797 ( -0.190788 0.64814 ) Epeak [keV] : 9999.36 ( -9999.35 -9999.36 ) Norm@50keV : 1.28349E-02 ( -0.00628587 0.0160024 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 42.24 using 59 PHA bins. # Reduced chi-squared = 0.7543 for 56 degrees of freedom # Null hypothesis probability = 9.131550e-01 Photon flux (15-150 keV) in 1 sec: 1.76785 ( -0.18369 0.17968 ) ph/cm2/s Energy fluence (15-150 keV) : 1.18738e-07 ( -1.65923e-08 1.14167e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 1.196 sec. Hardness ratio (energy fluence ratio) = 1.14051210408
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 6.757024e-08 S(50-150 keV) = 7.66731e-08
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 = -4.588351045099284E-01, IMY = 3.368247373716360E-01
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: -239.488000 -0.404000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 108.4751 55.1024 2.9 40.5 69.1 2.6193 4.0 ------ UNKNOWN 75.7641 41.2146 2.8 35.6 110.4 1.6672 4.1 ------ UNKNOWN 163.8134 63.3381 2.9 50.8 31.5 4.2473 3.9 ------ UNKNOWN 286.0614 51.0506 3.4 50.9 -44.5 3.1512 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.404000 0.952000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 63.6726 28.5954 2.2 41.2 134.7 0.1597 5.1 ------ UNKNOWN 10.3287 33.9802 0.7 29.6 -143.7 0.2467 16.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 60.012600 951.612590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 308.2540 40.7948 4.8 48.7 -33.9 -3.3332 -2.4 11.5 Cyg X-3 326.1607 38.4284 3.8 35.6 -40.8 2.2703 3.0 6.4 Cyg X-2 33.3273 30.9798 3.2 19.6 121.5 1.8118 3.6 ------ UNKNOWN 39.4941 -2.4553 2.6 45.6 166.0 5.1768 4.5 ------ UNKNOWN 40.2452 -15.1838 2.8 56.8 173.9 12.0407 4.2 ------ UNKNOWN 13.3758 47.5355 2.7 13.7 37.7 2.0835 4.3 ------ UNKNOWN 32.1173 -20.4664 2.5 58.3 -175.2 12.4038 4.5 ------ UNKNOWN 294.4851 61.6310 3.2 54.0 -5.8 5.7764 3.6 ------ UNKNOWN 322.1646 22.0135 3.7 43.8 -63.9 8.8235 3.2 ------ UNKNOWN 353.8118 -11.3685 2.2 48.0 -129.0 12.7139 5.1 ------ UNKNOWN