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 22:51:25 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger648601
======================================================================
Trigger: 00648601 Segment: 000
BAT Trigger Time: 458331798.528 [s; MET]
Trigger Stop: 458331799.552 [s; MET]
UTC: 2015-07-11T18:23:03.688560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 221.630798971157 Dec: -35.4711122907382 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.97
Image Trigger?: NO
Rate S/N Ratio: 11.5758369027902 [ if not an image trigger ]
Image S/N Ratio: 7.97
Analysis Position: [ source = BAT ]
RA: 221.630798971157 Dec: -35.4711122907382 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 221.623855138741 Dec: -35.4635038038544 [deg; J2000]
{ 14h 46m 29.7s , -35d 27' 48.6" }
+/- 0.98787408924078 [arcmin] (estimated 90% radius based on SNR)
+/- 0.43551830832634 [arcmin] (formal 1-sigma fit error)
SNR: 30.9519154679182
Angular difference between the analysis and refined position is 0.568806 arcmin
Partial Coding Fraction: 0.328125 [ including projection effects ]
Duration
T90: 70.9559999108315 +/- 14.2134365852416
Measured from: -27.9599999785423
to: 42.9959999322891 [s; relative to TRIGTIME]
T50: 14.4839999079704 +/- 3.43186306616897
Measured from: -4.13999998569489
to: 10.3439999222755 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.98000001907349
to: 2.98000001907349 [s; relative to TRIGTIME]
Total Fluence
Measured from: -34.0600000023842
to: 70.2360000014305 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.854910 2.638138 1.738202 0.420428
0.109263 0.101325 0.085054 0.070752 [error]
Peak 0.100968 0.145833 0.118864 0.046866
0.013447 0.013305 0.012262 0.008959 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 104.296 -34.060 70.236
T90 70.956 -27.960 42.996
T50 14.484 -4.140 10.344
Peak 1.000 1.980 2.980
====== 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: 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 -1.775 -0.085 0.085 - - - 4.44e-03 -2.13e-04 2.12e-04 71.100 57
CPL -1.483 -0.322 0.355 89.793 -25.048 -89.793 6.20e-03 -1.84e-03 3.02e-03 68.820 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 -1.538 -0.172 0.170 - - - 2.98e-02 -2.86e-03 2.85e-03 45.630 57
CPL -1.541 -0.168 0.176 9999.350 -9999.350 -9999.350 2.99e-02 -2.99e-02 1.54e-02 45.650 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 7.66e-07 1.19e-06 1.39e-06 3.14e-06 4.27e-06 6.49e-06 erg/cm2
90%_error_low -6.26e-08 -5.91e-08 -8.68e-08 -4.03e-07 -2.08e-07 -4.72e-07 erg/cm2
90%_error_hi 6.43e-08 5.89e-08 8.66e-08 4.41e-07 2.09e-07 4.98e-07 erg/cm2
Peak flux PL 1.27e+00 1.25e+00 8.63e-01 9.37e-01 3.77e+00 4.33e+00 ph/cm2/s
90%_error_low -2.20e-01 -1.35e-01 -1.02e-01 -2.13e-01 -3.80e-01 -4.10e-01 ph/cm2/s
90%_error_hi 2.33e-01 1.33e-01 1.00e-01 2.47e-01 3.82e-01 4.10e-01 ph/cm2/s
Fluence CPL 7.25e-07 1.22e-06 1.42e-06 2.09e-06 4.19e-06 5.45e-06 erg/cm2
90%_error_low -7.64e-08 -6.85e-08 -9.31e-08 -7.37e-07 -2.21e-07 -7.71e-07 erg/cm2
90%_error_hi 7.81e-08 6.95e-08 9.43e-08 1.18e-06 2.29e-07 1.23e-06 erg/cm2
Peak flux CPL 1.27e+00 1.23e+00 8.64e-01 9.34e-01 3.80e+00 4.52e+00 ph/cm2/s
90%_error_low N/A N/A N/A N/A -4.19e-01 -6.90e-01 ph/cm2/s
90%_error_hi N/A N/A N/A N/A 3.43e-01 2.13e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 221.6239 -35.4635 0.0062 46.9040 -161.2942 5.3206865 30.952 TRIG_00648601 Foreground time interval of the image: -34.060 12.373 (delta_t = 46.433 [sec]) Background time interval of the image: -239.528 -34.060 (delta_t = 205.468 [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 -34.060 sec. to 70.236 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.77451 ( -0.0852805 0.0845965 ) Norm@50keV : 4.44390E-03 ( -0.000212592 0.000212049 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 71.10 using 59 PHA bins. # Reduced chi-squared = 1.247 for 57 degrees of freedom # Null hypothesis probability = 9.913289e-02 Photon flux (15-150 keV) in 104.3 sec: 0.606445 ( -0.030751 0.030867 ) ph/cm2/s Energy fluence (15-150 keV) : 4.27213e-06 ( -2.08403e-07 2.08968e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -34.060 sec. to 70.236 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.48251 ( -0.321561 0.3546 ) Epeak [keV] : 89.7934 ( -25.0477 -89.7936 ) Norm@50keV : 6.20471E-03 ( -0.00184077 0.00301905 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 68.82 using 59 PHA bins. # Reduced chi-squared = 1.229 for 56 degrees of freedom # Null hypothesis probability = 1.166938e-01 Photon flux (15-150 keV) in 104.3 sec: 0.595489 ( -0.03296 0.033085 ) ph/cm2/s Energy fluence (15-150 keV) : 4.18739e-06 ( -2.20923e-07 2.29473e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.980 sec. to 2.980 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.53799 ( -0.171868 0.170255 ) Norm@50keV : 2.98442E-02 ( -0.0028582 0.0028521 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.63 using 59 PHA bins. # Reduced chi-squared = 0.8006 for 57 degrees of freedom # Null hypothesis probability = 8.602464e-01 Photon flux (15-150 keV) in 1 sec: 3.76519 ( -0.38026 0.38155 ) ph/cm2/s Energy fluence (15-150 keV) : 2.81482e-07 ( -2.86978e-08 2.87953e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.980 sec. to 2.980 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.54057 ( -0.168397 0.175709 ) Epeak [keV] : 9999.35 ( -9999.36 -9999.36 ) Norm@50keV : 2.99126E-02 ( -0.0299156 0.015408 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.65 using 59 PHA bins. # Reduced chi-squared = 0.8151 for 56 degrees of freedom # Null hypothesis probability = 8.369547e-01 Photon flux (15-150 keV) in 1 sec: 3.80321 ( -0.41864 0.34321 ) ph/cm2/s Energy fluence (15-150 keV) : 2.83936e-07 ( -3.11925e-08 2.62841e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
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 = -1.012317140710808E+00, IMY = 3.427650886563163E-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: -239.528000 -34.060000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9902 -15.6599 0.4 25.9 -126.4 6.2080 28.6 1.3 Sco X-1 255.9866 -37.8441 56.1 23.1 173.2 -0.0410 -0.2 0.0 4U 1700-377 256.4354 -36.4231 2.5 21.8 175.0 0.8555 4.6 0.0 GX 349+2 262.9160 -24.7917 5.2 9.9 -164.9 0.4090 2.2 5.8 GX 1+4 264.7709 -44.4361 5.8 25.7 151.4 0.4383 2.0 1.5 4U 1735-44 268.4319 -1.3169 4.2 18.4 -51.6 0.4922 2.7 9.0 SW J1753.5-0127 270.1014 -25.1338 6.8 6.0 155.8 0.3241 1.7 10.5 GX 5-1 270.2710 -25.6802 4.3 6.5 153.1 0.5477 3.0 4.1 GRS 1758-258 274.0571 -14.0352 3.4 5.7 -19.5 0.6067 3.4 3.0 GX 17+2 275.9195 -30.3454 2.6 11.5 122.1 0.7830 4.4 1.3 H1820-303 284.8993 -25.0113 6.6 13.2 77.0 -0.3585 -1.7 9.2 HT1900.1-2455 288.7965 10.9452 120.9 34.6 -10.4 -0.0214 -0.1 0.1 GRS 1915+105 262.9380 -33.8203 12.6 16.5 166.8 0.1572 0.9 2.7 GX 354-0 238.1211 -62.9364 2.5 49.3 159.1 2.7350 4.7 ------ UNKNOWN 309.6726 21.8633 2.4 55.3 3.2 3.8905 4.7 ------ UNKNOWN 238.1680 4.5671 3.9 41.0 -98.1 2.9234 3.0 ------ UNKNOWN 222.4224 -12.0337 3.6 48.1 -129.3 2.5910 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -34.060000 12.372620 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9906 -15.4277 0.0 26.0 -125.9 0.0391 0.4 12.8 Sco X-1 255.9037 -37.7179 7.0 23.0 173.5 -0.1477 -1.6 8.5 4U 1700-377 256.5478 -36.2999 9.0 21.6 175.0 -0.1135 -1.3 9.2 GX 349+2 263.1646 -24.8117 23.5 9.8 -165.6 -0.0382 -0.5 9.4 GX 1+4 264.9677 -44.4898 12.2 25.8 151.1 -0.0899 -0.9 9.9 4U 1735-44 268.3503 -1.3357 8.3 18.4 -51.9 0.1171 1.4 7.1 SW J1753.5-0127 270.2689 -25.0085 11.0 5.8 154.7 0.0847 1.1 4.3 GX 5-1 270.2296 -25.5916 12.4 6.4 153.6 0.0815 1.0 9.9 GRS 1758-258 273.9218 -14.1636 17.2 5.6 -20.3 -0.0501 -0.7 9.1 GX 17+2 275.7576 -30.4414 20.5 11.6 123.0 0.0457 0.6 9.7 H1820-303 285.0479 -24.9083 6.0 13.3 76.3 0.1671 1.9 1.0 HT1900.1-2455 288.7018 10.9405 19.9 34.5 -10.5 -0.0561 -0.6 5.7 GRS 1915+105 263.2416 -33.8289 0.0 16.4 166.0 -0.1074 -1.4 12.6 GX 354-0 303.8030 -50.9623 2.6 40.3 108.6 1.4015 4.4 ------ UNKNOWN 224.2891 -47.7894 2.5 47.7 -178.3 0.7976 4.7 ------ UNKNOWN 221.6239 -35.4635 0.4 46.9 -161.3 5.3209 31.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 94.972590 907.972590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.2007 -60.6516 7.5 41.0 -151.6 1.6969 1.5 3.8 Cen X-3 186.8587 -62.8617 3.7 34.8 -160.2 2.4273 3.1 7.8 GX 301-2 244.9706 -15.6329 0.4 28.8 45.1 26.2077 32.7 0.7 Sco X-1 256.0625 -37.6908 5.8 27.6 97.6 -1.8930 -2.0 9.9 4U 1700-377 256.4810 -36.5162 7.5 28.1 95.2 1.5594 1.5 6.0 GX 349+2 263.1442 -24.7948 4.6 37.2 77.7 4.6697 2.5 7.9 GX 1+4 264.6214 -44.3489 9.7 33.8 111.3 -1.4902 -1.2 8.0 4U 1735-44 262.9928 -33.8294 58.1 33.8 92.2 0.2747 0.2 0.4 GX 354-0 233.1349 -41.8381 2.8 11.0 121.6 2.2733 4.1 ------ UNKNOWN 233.0246 -13.8436 2.6 23.9 20.9 2.6616 4.4 ------ UNKNOWN 209.5819 -64.7240 1.0 30.2 -177.1 7.5358 11.6 ------ UNKNOWN 224.1541 6.8484 3.1 42.4 -3.6 3.7220 3.7 ------ UNKNOWN 222.8213 -2.8596 2.6 32.6 -5.1 3.2215 4.5 ------ UNKNOWN 158.3137 -44.9704 4.2 48.0 -129.1 9.0970 2.8 ------ UNKNOWN