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: Sun Nov 1 01:44:22 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger655721
======================================================================
Trigger: 00655721 Segment: 000
BAT Trigger Time: 464044720 [s; MET]
Trigger Stop: 464044784 [s; MET]
UTC: 2015-09-15T21:18:24.860420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 319.730955300173 Dec: -34.8537258550562 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.23
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.23
Analysis Position: [ source = BAT ]
RA: 319.730955300173 Dec: -34.8537258550562 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 319.679786129478 Dec: -34.8652489691896 [deg; J2000]
{ 21h 18m 43.1s , -34d 51' 54.9" }
+/- 3.62218481295882 [arcmin] (estimated 90% radius based on SNR)
+/- 2.20575107198738 [arcmin] (formal 1-sigma fit error)
SNR: 4.83714319162991
Angular difference between the analysis and refined position is 2.612382 arcmin
Partial Coding Fraction: 0.5546875 [ including projection effects ]
Duration
T90: 160 +/- 57.6888204074238
Measured from: -63
to: 97 [s; relative to TRIGTIME]
T50: 64 +/- 45.254833995939
Measured from: -15
to: 49 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 40.5
to: 41.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: -63
to: 113 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.818489 0.596014 0.183994 0.033346
0.108507 0.106067 0.090961 0.083400 [error]
Peak 0.000853 0.013820 0.003483 -0.000788
0.008674 0.008352 0.007045 0.006573 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 176.000 -63.000 113.000
T90 160.000 -63.000 97.000
T50 64.000 -15.000 49.000
Peak 1.000 40.500 41.500
====== 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 -2.474 -0.460 0.393 - - - 4.22e-04 -1.37e-04 1.36e-04 53.270 57
CPL -1.921 N/A N/A 4.860 N/A N/A 9.68e-04 N/A N/A 53.520 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 -2.218 2.218 2.218 - - - 1.08e-03 -1.08e-03 1.55e-03 56.100 57
CPL 0.112 N/A N/A 43.299 N/A N/A 1.97e-02 N/A N/A 55.510 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 2.39e-07 2.44e-07 1.76e-07 2.03e-07 7.38e-07 8.62e-07 erg/cm2
90%_error_low -5.27e-08 -5.44e-08 -7.22e-08 -1.23e-07 -1.73e-07 -2.46e-07 erg/cm2
90%_error_hi 5.30e-08 5.18e-08 8.33e-08 2.20e-07 1.86e-07 3.21e-07 erg/cm2
Peak flux PL 8.90e-02 5.86e-02 2.56e-02 1.53e-02 1.80e-01 1.89e-01 ph/cm2/s
90%_error_low -8.90e-02 -5.86e-02 -2.56e-02 -1.53e-02 -1.80e-01 -1.89e-01 ph/cm2/s
90%_error_hi 1.23e-01 6.62e-02 4.97e-02 1.07e-01 1.99e-01 2.11e-01 ph/cm2/s
Fluence CPL 2.38e-07 2.34e-07 1.68e-07 2.32e-07 7.19e-07 8.71e-07 erg/cm2
90%_error_low -5.77e-08 -1.08e-07 -1.17e-07 -1.98e-07 -3.20e-07 -4.51e-07 erg/cm2
90%_error_hi 5.44e-08 6.23e-08 9.34e-08 2.60e-07 2.14e-07 3.88e-07 erg/cm2
Peak flux CPL N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_low -8.90e-02 -5.86e-02 -2.56e-02 -1.53e-02 -1.80e-01 -1.89e-01 ph/cm2/s
90%_error_hi 1.23e-01 6.62e-02 4.97e-02 1.07e-01 1.99e-01 2.11e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 319.6798 -34.8652 0.0396 24.5786 121.4265 1.1257401 4.837 TRIG_00655721 Foreground time interval of the image: -63.000 72.301 (delta_t = 135.301 [sec]) Background time interval of the image: -239.000 -63.000 (delta_t = 176.000 [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.
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 -63.000 sec. to 113.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.47391 ( -0.460319 0.393281 ) Norm@50keV : 4.22275E-04 ( -0.000137072 0.000136467 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.27 using 59 PHA bins. # Reduced chi-squared = 0.9346 for 57 degrees of freedom # Null hypothesis probability = 6.156998e-01 Photon flux (15-150 keV) in 176 sec: 8.16593E-02 ( -0.0148113 0.0148151 ) ph/cm2/s Energy fluence (15-150 keV) : 7.38265e-07 ( -1.73273e-07 1.86013e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -63.000 sec. to 113.000 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.92115 ( ) Epeak [keV] : 4.86026 ( ) Norm@50keV : 9.68270E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.52 using 59 PHA bins. # Reduced chi-squared = 0.9556 for 56 degrees of freedom # Null hypothesis probability = 5.694957e-01 Photon flux (15-150 keV) in 176 sec: 7.99522E-02 ( -0.0142646 0.0150586 ) ph/cm2/s Energy fluence (15-150 keV) : 7.18626e-07 ( -3.20278e-07 2.14333e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 40.500 sec. to 41.500 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.21818 ( 2.21558 2.21558 ) Norm@50keV : 1.07750E-03 ( -0.00107796 0.00154959 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.10 using 59 PHA bins. # Reduced chi-squared = 0.9842 for 57 degrees of freedom # Null hypothesis probability = 5.089292e-01 Photon flux (15-150 keV) in 1 sec: 0.180018 ( -0.180018 0.19877 ) ph/cm2/s Energy fluence (15-150 keV) : 1.01191e-08 ( 1 1.43947e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 40.500 sec. to 41.500 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.58651 ( ) Epeak [keV] : 45.3051 ( ) Norm@50keV : 0.105095 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.42 using 59 PHA bins. # Reduced chi-squared = 0.9897 for 56 degrees of freedom # Null hypothesis probability = 4.966629e-01 Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.03822e-08 ( -1.01308e-08 1.31965e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 160.0 sec. Hardness ratio (energy fluence ratio) = 0.720045241608
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.832909e-07 S(50-150 keV) = 2.5497251e-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 = -2.384817959365511E-01, IMY = -3.902897601720814E-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: -239.000000 -63.000000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9595 -15.6451 1.0 44.2 -56.8 7.6467 11.7 1.2 Sco X-1 255.9126 -37.7211 4.6 27.7 -87.7 0.6553 2.5 8.2 4U 1700-377 256.2820 -36.4144 9.5 27.5 -84.8 0.3109 1.2 7.4 GX 349+2 263.0035 -24.8059 4.5 25.0 -55.8 0.5696 2.6 3.6 GX 1+4 264.5365 -44.3998 3.7 22.2 -105.7 0.6675 3.1 9.3 4U 1735-44 268.3690 -1.4535 7.8 38.0 -16.1 0.3537 1.5 0.1 SW J1753.5-0127 270.2673 -25.0972 1.7 19.1 -47.8 1.2488 6.6 1.4 GX 5-1 270.4033 -25.7463 8.9 18.6 -49.3 0.2464 1.3 5.5 GRS 1758-258 273.9094 -14.1497 5.8 24.4 -19.8 0.3600 2.0 8.8 GX 17+2 275.8080 -30.3263 5.7 12.4 -57.4 0.3790 2.0 6.5 H1820-303 284.9138 -25.0587 6.4 9.7 -7.2 -0.3196 -1.8 10.6 HT1900.1-2455 288.7808 10.9479 1.4 44.7 18.9 3.1683 8.2 1.0 GRS 1915+105 263.0357 -33.7383 3.2 22.2 -77.1 0.7413 3.6 6.2 GX 354-0 279.4192 19.1567 2.5 53.8 8.1 3.3723 4.7 ------ UNKNOWN 7.8115 -70.8961 3.1 54.4 177.2 3.0218 3.7 ------ UNKNOWN 355.1735 -84.0264 2.8 53.9 -166.4 2.3590 4.1 ------ UNKNOWN 230.0509 -86.2935 2.5 54.4 -155.7 3.0100 4.7 ------ UNKNOWN 251.7490 -46.4958 2.7 31.4 -105.0 1.2135 4.3 ------ UNKNOWN 238.7231 -39.1850 5.1 40.9 -92.5 1.8103 2.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -63.000000 72.300600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.8287 -15.6798 5.8 44.3 -56.9 -1.2883 -2.0 9.0 Sco X-1 256.1766 -37.9435 4.0 27.5 -88.2 0.6905 2.9 10.8 4U 1700-377 256.6226 -36.5528 0.0 27.2 -85.1 0.3206 1.3 11.9 GX 349+2 263.0676 -24.8791 27.3 24.9 -55.8 -0.0907 -0.4 8.6 GX 1+4 264.5818 -44.3162 7.4 22.2 -105.6 -0.3238 -1.6 10.6 4U 1735-44 268.2555 -1.5130 19.8 38.0 -16.3 0.1424 0.6 7.7 SW J1753.5-0127 270.2080 -25.1456 4.4 19.1 -48.0 -0.4825 -2.6 5.7 GX 5-1 270.1678 -25.8563 5.1 18.8 -50.0 0.4171 2.3 10.0 GRS 1758-258 274.1111 -13.8540 0.0 24.5 -19.1 0.0803 0.4 12.5 GX 17+2 275.9524 -30.3781 143.8 12.2 -57.4 0.0140 0.1 1.6 H1820-303 285.1558 -24.9537 10.7 9.7 -5.7 -0.1820 -1.1 6.8 HT1900.1-2455 288.9587 10.8572 20.0 44.6 19.1 -0.2141 -0.6 10.8 GRS 1915+105 263.0934 -33.6849 4.0 22.2 -77.0 -0.6006 -2.9 10.4 GX 354-0
Post-slew image of 15-350 keV band
Time interval of the image: 117.900620 854.800600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 270.3142 -25.1341 16.8 43.4 -52.6 1.2018 0.7 3.7 GX 5-1 270.1995 -25.6446 4.9 43.3 -53.4 4.1792 2.4 8.1 GRS 1758-258 273.9022 -13.9572 27.6 46.1 -36.5 0.4042 0.4 7.7 GX 17+2 276.0727 -30.2598 6.8 36.8 -57.0 1.2445 1.7 10.0 H1820-303 285.0432 -24.9132 18.3 31.5 -42.8 0.3545 0.6 0.6 HT1900.1-2455 288.8140 10.9610 2.3 54.4 0.0 7.6989 5.0 1.3 GRS 1915+105 316.7387 -17.8869 3.3 17.2 28.8 1.5695 3.5 ------ UNKNOWN 303.0519 -18.9774 4.0 21.7 -8.8 1.2558 2.9 ------ UNKNOWN 46.6961 -66.0949 3.5 57.3 -170.4 7.8857 3.3 ------ UNKNOWN 49.9097 -70.1026 5.4 57.6 -165.4 5.0552 2.1 ------ UNKNOWN 266.9358 -43.9238 2.3 41.1 -80.8 11.2210 4.9 ------ UNKNOWN 266.3183 -27.4138 2.6 45.8 -57.7 10.2653 4.5 ------ UNKNOWN