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: Fri Aug 7 22:48:32 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger649157
======================================================================
Trigger: 00649157 Segment: 000
BAT Trigger Time: 458723217.92 [s; MET]
Trigger Stop: 458723218.944 [s; MET]
UTC: 2015-07-16T07:06:43.060080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 278.46659588295 Dec: -13.0170497349609 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.13
Image Trigger?: NO
Rate S/N Ratio: 13.490737563232 [ if not an image trigger ]
Image S/N Ratio: 7.13
Analysis Position: [ source = BAT ]
RA: 278.46659588295 Dec: -13.0170497349609 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 278.486348402472 Dec: -12.9754591064619 [deg; J2000]
{ 18h 33m 56.7s , -12d 58' 31.7" }
+/- 1.00312987941412 [arcmin] (estimated 90% radius based on SNR)
+/- 0.334493647122253 [arcmin] (formal 1-sigma fit error)
SNR: 30.2816524461249
Angular difference between the analysis and refined position is 2.749683 arcmin
Partial Coding Fraction: 0.9140625 [ including projection effects ]
Duration
T90: 42.567999958992 +/- 5.58947724938619
Measured from: -2.33200001716614
to: 40.2359999418259 [s; relative to TRIGTIME]
T50: 17.8039999604225 +/- 2.14725871765236
Measured from: 3.83599996566772
to: 21.6399999260902 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 9.69199997186661
to: 10.6919999718666 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.19200003147125
to: 47.1439999938011 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.684868 0.968080 0.673103 0.126000
0.045822 0.042901 0.036249 0.030608 [error]
Peak 0.040034 0.040077 0.020141 0.007255
0.006649 0.006154 0.005279 0.004180 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 51.336 -4.192 47.144
T90 42.568 -2.332 40.236
T50 17.804 3.836 21.640
Peak 1.000 9.692 10.692
====== 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 -1.534 -0.095 0.095 - - - 3.05e-03 -1.61e-04 1.61e-04 64.780 57
CPL -1.006 -0.390 0.429 94.478 -22.225 114.333 5.58e-03 -1.97e-03 3.43e-03 59.260 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 -1.796 -0.328 0.307 - - - 5.99e-03 -1.23e-03 1.19e-03 47.780 57
CPL -1.334 -0.810 1.620 63.556 -49.419 -63.556 1.08e-02 -1.08e-02 7.93e-02 47.350 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 2.06e-07 3.71e-07 5.13e-07 1.47e-06 1.48e-06 2.56e-06 erg/cm2
90%_error_low -1.89e-08 -2.06e-08 -3.54e-08 -2.11e-07 -8.47e-08 -2.38e-07 erg/cm2
90%_error_hi 1.95e-08 2.05e-08 3.53e-08 2.34e-07 8.52e-08 2.57e-07 erg/cm2
Peak flux PL 3.28e-01 2.77e-01 1.60e-01 1.37e-01 8.24e-01 9.01e-01 ph/cm2/s
90%_error_low -8.38e-02 -4.81e-02 -4.20e-02 -5.95e-02 -1.43e-01 -1.58e-01 ph/cm2/s
90%_error_hi 8.87e-02 4.80e-02 4.23e-02 8.22e-02 1.43e-01 1.59e-01 ph/cm2/s
Fluence CPL 1.87e-07 3.88e-07 5.26e-07 7.01e-07 1.41e-06 1.80e-06 erg/cm2
90%_error_low -2.33e-08 -2.43e-08 -3.84e-08 -2.71e-07 -9.72e-08 -2.87e-07 erg/cm2
90%_error_hi 2.37e-08 2.47e-08 3.88e-08 4.88e-07 9.74e-08 4.91e-07 erg/cm2
Peak flux CPL 3.11e-01 2.92e-01 1.61e-01 7.44e-02 8.09e-01 8.38e-01 ph/cm2/s
90%_error_low -9.69e-02 -6.19e-02 -4.75e-02 -7.44e-02 -1.49e-01 -1.70e-01 ph/cm2/s
90%_error_hi 9.84e-02 6.55e-02 4.61e-02 8.27e-02 1.48e-01 1.83e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 278.4863 -12.9755 0.0063 13.0783 56.2112 1.4986007 30.282 TRIG_00649157 Foreground time interval of the image: -4.192 13.381 (delta_t = 17.573 [sec]) Background time interval of the image: -239.920 -4.192 (delta_t = 235.728 [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 -4.192 sec. to 47.144 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.53412 ( -0.0950769 0.0946912 ) Norm@50keV : 3.04669E-03 ( -0.000161248 0.000160896 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.78 using 59 PHA bins. # Reduced chi-squared = 1.136 for 57 degrees of freedom # Null hypothesis probability = 2.236970e-01 Photon flux (15-150 keV) in 51.34 sec: 0.383954 ( -0.020693 0.020739 ) ph/cm2/s Energy fluence (15-150 keV) : 1.47613e-06 ( -8.46566e-08 8.52013e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.192 sec. to 47.144 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.00573 ( -0.389639 0.42915 ) Epeak [keV] : 94.4785 ( -22.2255 114.333 ) Norm@50keV : 5.57724E-03 ( -0.00196649 0.00342964 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.26 using 59 PHA bins. # Reduced chi-squared = 1.058 for 56 degrees of freedom # Null hypothesis probability = 3.576634e-01 Photon flux (15-150 keV) in 51.34 sec: 0.371913 ( -0.022424 0.022437 ) ph/cm2/s Energy fluence (15-150 keV) : 1.41074e-06 ( -9.71579e-08 9.73838e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 9.692 sec. to 10.692 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.79646 ( -0.328315 0.307401 ) Norm@50keV : 5.98850E-03 ( -0.00122654 0.00118734 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.78 using 59 PHA bins. # Reduced chi-squared = 0.8382 for 57 degrees of freedom # Null hypothesis probability = 8.028877e-01 Photon flux (15-150 keV) in 1 sec: 0.824114 ( -0.143098 0.143187 ) ph/cm2/s Energy fluence (15-150 keV) : 5.51455e-08 ( -1.12389e-08 1.15613e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.692 sec. to 10.692 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.33426 ( -0.809982 1.62054 ) Epeak [keV] : 63.5560 ( -49.422 -63.5592 ) Norm@50keV : 1.08445E-02 ( -0.0108437 0.0792631 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.35 using 59 PHA bins. # Reduced chi-squared = 0.8456 for 56 degrees of freedom # Null hypothesis probability = 7.880564e-01 Photon flux (15-150 keV) in 1 sec: 0.809417 ( -0.148919 0.148071 ) ph/cm2/s Energy fluence (15-150 keV) : 5.2672e-08 ( -1.27612e-08 1.28806e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 42.568 sec. Hardness ratio (energy fluence ratio) = 1.38121110188
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.77357e-07 S(50-150 keV) = 8.98794e-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 = 1.291940800163469E-01, IMY = -1.930691838926180E-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: -239.920000 -4.192000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9841 -15.6354 0.3 21.6 -82.5 8.6520 34.6 0.4 Sco X-1 254.3821 35.3859 6.7 57.0 -13.8 1.6128 1.7 4.5 Her X-1 255.9810 -37.8422 0.4 20.0 -154.8 6.8037 28.6 0.3 4U 1700-377 256.3578 -36.4268 3.6 18.7 -153.2 0.7486 3.2 3.8 GX 349+2 263.1814 -24.6041 0.0 5.7 -141.3 0.5060 2.3 12.7 GX 1+4 264.5624 -44.2929 31.2 24.1 -176.8 0.0843 0.4 12.2 4U 1735-44 268.4664 -1.4921 14.5 18.9 2.6 0.1715 0.8 6.4 SW J1753.5-0127 270.2910 -25.0643 3.6 5.5 148.0 0.7215 3.2 1.0 GX 5-1 270.2023 -25.7026 3.4 6.1 151.9 0.7749 3.5 5.9 GRS 1758-258 273.9442 -13.9630 5.7 9.1 45.1 0.4090 2.0 5.7 GX 17+2 275.9209 -30.3698 2.7 12.8 142.2 0.9756 4.3 0.3 H1820-303 284.9958 -25.0694 17.5 17.1 108.1 0.1648 0.7 9.2 HT1900.1-2455 288.9506 10.7921 33.9 37.8 35.1 0.1437 0.3 12.9 GRS 1915+105 262.9617 -33.8144 3.2 14.0 -166.7 0.7804 3.6 1.8 GX 354-0 283.8324 -22.8876 2.5 15.7 101.1 1.0830 4.6 ------ UNKNOWN 263.4842 30.8994 2.9 51.3 -5.4 2.0947 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -4.192000 13.380590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.1310 -15.5190 7.0 21.5 -82.1 0.0943 1.6 11.4 Sco X-1 254.5674 35.3492 5.3 56.9 -13.6 -0.4344 -2.2 5.4 Her X-1 256.1477 -38.0125 0.0 20.1 -155.4 0.1501 3.1 12.7 4U 1700-377 256.4875 -36.2789 5.2 18.5 -153.2 0.1025 2.2 9.0 GX 349+2 262.8470 -24.6944 3.6 5.9 -139.7 0.1539 3.2 9.3 GX 1+4 264.7683 -44.3007 4.8 24.1 -177.1 0.1220 2.4 9.0 4U 1735-44 268.5094 -1.4866 10.0 18.9 2.7 -0.0567 -1.2 8.7 SW J1753.5-0127 270.2835 -25.0926 13.5 5.6 148.3 0.0429 0.9 0.8 GX 5-1 270.2719 -25.6618 38.2 6.1 151.2 -0.0168 -0.3 5.2 GRS 1758-258 273.9481 -13.8876 8.1 9.1 44.8 -0.0696 -1.4 9.5 GX 17+2 276.1012 -30.5075 0.0 13.0 142.1 -0.0809 -1.7 12.4 H1820-303 284.8645 -24.8532 7.5 16.9 107.4 -0.0831 -1.5 10.2 HT1900.1-2455 288.9430 10.8531 10.6 37.8 35.1 0.0973 1.1 10.2 GRS 1915+105 262.8187 -33.7495 6.0 14.0 -166.2 -0.0893 -1.9 9.9 GX 354-0 311.9585 -37.5077 2.0 42.3 122.5 1.2204 5.9 ------ UNKNOWN 283.7079 -5.0724 2.3 22.1 47.3 0.2867 5.0 ------ UNKNOWN 278.4864 -12.9754 0.4 13.1 56.2 1.4987 30.3 ------ UNKNOWN 275.5814 6.0622 2.3 27.6 16.9 0.2945 5.1 ------ UNKNOWN 245.1807 4.2751 2.1 32.7 -45.1 0.3301 5.4 ------ UNKNOWN 220.2578 -30.0702 2.7 43.3 -114.1 0.8243 4.3 ------ UNKNOWN 214.2304 -44.4375 2.5 49.7 -133.0 0.9591 4.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 65.580590 422.380000 840.080000 962.117900 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0015 -15.6480 2.3 32.5 -128.4 17.9414 5.0 1.4 Sco X-1 255.9676 -37.8578 2.6 31.9 -174.8 12.5289 4.4 1.2 4U 1700-377 256.5050 -36.5613 12.2 30.7 -173.6 2.6693 0.9 8.9 GX 349+2 263.0820 -24.6096 6.9 18.6 -160.4 4.3114 1.7 9.1 GX 1+4 264.9384 -44.3651 6.4 33.4 168.1 -5.8385 -1.8 9.8 4U 1735-44 268.2595 -1.4975 18.6 15.3 -71.8 1.5401 0.6 7.0 SW J1753.5-0127 270.3286 -25.1432 6.0 14.4 -178.5 4.8696 1.9 4.5 GX 5-1 270.3495 -25.8987 4.2 15.0 179.9 -6.9360 -2.8 9.7 GRS 1758-258 274.2020 -13.9754 10.6 4.3 -133.2 2.7082 1.1 12.0 GX 17+2 276.1606 -30.3112 0.0 17.4 157.1 -2.8326 -1.2 12.7 H1820-303 284.9924 -25.0654 9.6 13.5 124.3 3.1874 1.2 9.0 HT1900.1-2455 288.6944 11.0384 7.5 26.1 -6.3 -3.7183 -1.5 8.3 GRS 1915+105 299.6253 35.1772 7.6 52.2 -7.7 8.2867 1.5 2.3 Cyg X-1 262.8272 -33.7891 4.7 25.2 -177.8 5.8906 2.4 8.5 GX 354-0 291.0356 -39.8806 2.9 29.1 130.3 13.5278 4.0 ------ UNKNOWN 316.6962 28.8202 3.0 55.8 11.3 45.6120 3.8 ------ UNKNOWN 272.4901 -46.2264 2.7 33.6 157.9 14.7517 4.2 ------ UNKNOWN 294.8157 -3.7740 2.9 18.6 32.0 8.5404 3.9 ------ UNKNOWN 244.3114 -46.5046 3.1 44.1 -175.9 16.6439 3.8 ------ UNKNOWN