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: Thu Mar 17 18:44:07 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger672525
======================================================================
Trigger: 00672525 Segment: 000
BAT Trigger Time: 476158406.4 [s; MET]
Trigger Stop: 476158422.784 [s; MET]
UTC: 2016-02-03T02:13:10.612140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 161.951792632841 Dec: -24.7621168677871 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.81
Image Trigger?: NO
Rate S/N Ratio: 14.1774468787578 [ if not an image trigger ]
Image S/N Ratio: 8.81
Analysis Position: [ source = BAT ]
RA: 161.951792632841 Dec: -24.7621168677871 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 161.975327594921 Dec: -24.7689926893186 [deg; J2000]
{ 10h 47m 54.1s , -24d 46' 08.4" }
+/- 1.73490565806985 [arcmin] (estimated 90% radius based on SNR)
+/- 0.75974114968461 [arcmin] (formal 1-sigma fit error)
SNR: 13.8450879205332
Angular difference between the analysis and refined position is 1.346960 arcmin
Partial Coding Fraction: 0.203125 [ including projection effects ]
Duration
T90: 17.4400000572205 +/- 2.28598513042857
Measured from: 6.68000000715256
to: 24.120000064373 [s; relative to TRIGTIME]
T50: 8.432000041008 +/- 2.5837399360243
Measured from: 10.3600000143051
to: 18.7920000553131 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 11.9800000190735
to: 12.9800000190735 [s; relative to TRIGTIME]
Total Fluence
Measured from: 6.08799999952316
to: 25.7840000391006 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.653406 0.706446 0.360860 0.067036
0.067753 0.071130 0.058294 0.048792 [error]
Peak 0.060200 0.053487 0.030209 0.020681
0.015248 0.017867 0.014779 0.011595 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 19.696 6.088 25.784
T90 17.440 6.680 24.120
T50 8.432 10.360 18.792
Peak 1.000 11.980 12.980
====== 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 -1.941 -0.218 0.207 - - - 5.48e-03 -7.61e-04 7.42e-04 50.830 57
CPL -1.776 -0.518 0.943 58.475 N/A N/A 6.80e-03 N/A N/A 50.710 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 -2.003 -0.705 0.560 - - - 8.60e-03 -3.85e-03 3.53e-03 53.710 57
CPL -2.021 -0.144 3.591 48.083 N/A N/A 8.38e-03 N/A N/A 53.710 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 2.09e-07 2.94e-07 3.06e-07 5.85e-07 9.93e-07 1.39e-06 erg/cm2
90%_error_low -3.43e-08 -3.33e-08 -5.71e-08 -1.93e-07 -1.32e-07 -2.60e-07 erg/cm2
90%_error_hi 3.53e-08 3.33e-08 5.78e-08 2.47e-07 1.34e-07 3.01e-07 erg/cm2
Peak flux PL 5.75e-01 4.30e-01 2.15e-01 1.53e-01 1.29e+00 1.37e+00 ph/cm2/s
90%_error_low -2.35e-01 -1.40e-01 -1.16e-01 -1.53e-01 -4.06e-01 -4.42e-01 ph/cm2/s
90%_error_hi 2.47e-01 1.37e-01 1.21e-01 2.13e-01 4.06e-01 4.49e-01 ph/cm2/s
Fluence CPL 2.06e-07 3.00e-07 3.05e-07 4.29e-07 9.77e-07 1.24e-06 erg/cm2
90%_error_low -3.78e-08 N/A -6.10e-08 -3.27e-07 -1.53e-07 -3.73e-07 erg/cm2
90%_error_hi 3.65e-08 N/A 5.93e-08 3.04e-07 1.38e-07 4.84e-07 erg/cm2
Peak flux CPL 5.75e-01 4.29e-01 2.15e-01 1.90e-01 1.29e+00 1.38e+00 ph/cm2/s
90%_error_low -2.34e-01 N/A -1.11e-01 -1.90e-01 -4.05e-01 -4.34e-01 ph/cm2/s
90%_error_hi 2.48e-01 N/A 4.26e-02 5.46e-02 4.06e-01 4.58e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 161.9753 -24.7690 0.0139 34.8490 110.1820 1.8311919 13.845 TRIG_00672525 Foreground time interval of the image: 6.088 25.784 (delta_t = 19.696 [sec]) Background time interval of the image: -239.400 6.088 (delta_t = 245.488 [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 6.088 sec. to 25.784 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.94144 ( -0.217695 0.206835 ) Norm@50keV : 5.47648E-03 ( -0.00076123 0.000741711 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.83 using 59 PHA bins. # Reduced chi-squared = 0.8918 for 57 degrees of freedom # Null hypothesis probability = 7.043842e-01 Photon flux (15-150 keV) in 19.7 sec: 0.800179 ( -0.091528 0.09158 ) ph/cm2/s Energy fluence (15-150 keV) : 9.92764e-07 ( -1.31777e-07 1.33957e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.088 sec. to 25.784 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.77633 ( -0.518069 0.943466 ) Epeak [keV] : 58.4746 ( ) Norm@50keV : 6.80099E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.71 using 59 PHA bins. # Reduced chi-squared = 0.9055 for 56 degrees of freedom # Null hypothesis probability = 6.747746e-01 Photon flux (15-150 keV) in 19.7 sec: 0.795516 ( -0.094445 0.094027 ) ph/cm2/s Energy fluence (15-150 keV) : 9.76667e-07 ( -1.53029e-07 1.38131e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 11.980 sec. to 12.980 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.00301 ( -0.704835 0.5601 ) Norm@50keV : 8.59621E-03 ( -0.00384608 0.00352646 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.71 using 59 PHA bins. # Reduced chi-squared = 0.9424 for 57 degrees of freedom # Null hypothesis probability = 5.991156e-01 Photon flux (15-150 keV) in 1 sec: 1.29131 ( -0.40567 0.40572 ) ph/cm2/s Energy fluence (15-150 keV) : 7.92994e-08 ( -3.09813e-08 3.28198e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.980 sec. to 12.980 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.02123 ( -0.144169 3.59117 ) Epeak [keV] : 48.0827 ( ) Norm@50keV : 8.38375E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.71 using 59 PHA bins. # Reduced chi-squared = 0.9592 for 56 degrees of freedom # Null hypothesis probability = 5.618816e-01 Photon flux (15-150 keV) in 1 sec: 1.29170 ( -0.40542 0.40577 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 17.44 sec. Hardness ratio (energy fluence ratio) = 1.04145380962
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.023969e-07 S(50-150 keV) = 4.90376e-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 = -2.402208657539906E-01, IMY = -6.535364046436554E-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: -239.400000 6.088000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4334 -40.5658 3.2 24.8 57.3 -1.0316 -3.6 4.4 Vela X-1 170.6612 -60.6988 471.8 4.9 -144.4 0.0054 0.0 11.1 Cen X-3 186.6609 -62.7544 0.9 12.7 -136.0 2.7673 12.3 1.0 GX 301-2 93.3417 -36.2340 3.0 48.3 16.0 2.2372 3.9 ------ UNKNOWN 86.3873 -34.9938 2.8 52.8 11.2 3.4675 4.1 ------ UNKNOWN 168.9269 -44.3687 2.8 16.0 129.6 0.8693 4.1 ------ UNKNOWN 118.3065 -57.4191 2.9 22.0 5.6 0.9146 4.0 ------ UNKNOWN 87.1599 -69.8633 2.4 30.9 -31.2 1.2867 4.8 ------ UNKNOWN 246.0708 -73.3305 3.1 33.0 -103.0 1.3851 3.7 ------ UNKNOWN 268.4238 -79.1501 2.7 35.0 -89.6 2.1267 4.3 ------ UNKNOWN 279.3044 -75.0653 3.5 39.5 -92.2 3.2609 3.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 6.088000 25.784000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5865 -40.6999 5.6 24.7 57.4 0.1543 2.1 9.1 Vela X-1 169.9073 -60.5561 0.0 4.5 -145.5 -0.0969 -2.0 12.7 Cen X-3 186.4227 -62.8734 6.9 12.6 -135.4 0.0924 1.7 8.9 GX 301-2 180.5751 -15.9584 2.6 45.9 135.3 1.1452 4.4 ------ UNKNOWN 161.9753 -24.7690 0.8 34.8 110.2 1.8313 13.9 ------ UNKNOWN 88.3783 -64.4050 2.8 32.5 -21.3 0.2663 4.1 ------ UNKNOWN 56.4175 -50.4224 2.1 54.3 -21.9 0.8741 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 121.100580 458.900590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.6792 -40.5962 4.0 27.0 -8.2 0.8404 2.9 7.3 Vela X-1 170.5451 -60.7187 4.0 36.4 -63.0 -1.3827 -2.8 8.9 Cen X-3 186.7922 -62.7372 3.7 41.4 -72.9 3.2949 3.1 4.2 GX 301-2 127.3140 -0.2124 2.5 41.5 65.0 5.4631 4.6 ------ UNKNOWN 150.4350 7.8930 3.5 34.6 103.6 2.1250 3.3 ------ UNKNOWN 114.5666 -15.8757 3.4 45.1 36.0 2.9036 3.4 ------ UNKNOWN 163.9925 7.6891 2.6 32.5 127.8 2.2370 4.5 ------ UNKNOWN 163.5557 -8.8231 3.3 16.0 129.8 0.9618 3.5 ------ UNKNOWN 209.0496 -12.6397 3.1 46.0 -152.3 2.2042 3.7 ------ UNKNOWN 218.3263 -2.2560 3.1 58.7 -159.2 7.2379 3.7 ------ UNKNOWN 215.0008 -16.3635 3.1 50.1 -144.9 3.1964 3.8 ------ UNKNOWN 97.9869 -65.3254 3.1 56.8 -29.3 6.1539 3.7 ------ UNKNOWN 211.0870 -38.9731 2.4 43.5 -114.6 6.0450 4.9 ------ UNKNOWN