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 Apr 12 15:17:48 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger737125
======================================================================
Trigger: 00737125 Segment: 000
BAT Trigger Time: 508111064.064 [s; MET]
Trigger Stop: 508111068.16 [s; MET]
UTC: 2017-02-06T21:57:25.488720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 271.785667508088 Dec: 11.2228219729964 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.48
Image Trigger?: NO
Rate S/N Ratio: 9.32737905308882 [ if not an image trigger ]
Image S/N Ratio: 7.48
Analysis Position: [ source = BAT ]
RA: 271.785667508088 Dec: 11.2228219729964 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 271.782770487604 Dec: 11.1751130970994 [deg; J2000]
{ 18h 07m 07.9s , +11d 10' 30.4" }
+/- 2.19988005435562 [arcmin] (estimated 90% radius based on SNR)
+/- 1.00249872004088 [arcmin] (formal 1-sigma fit error)
SNR: 9.86227136990764
Angular difference between the analysis and refined position is 2.867606 arcmin
Partial Coding Fraction: 0.7890625 [ including projection effects ]
Duration
T90: 13.3600000143051 +/- 2.6770251832304
Measured from: -0.00800001621246338
to: 13.3519999980927 [s; relative to TRIGTIME]
T50: 7.44000005722046 +/- 2.97294468953417
Measured from: 1.92799997329712
to: 9.36800003051758 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.57199996709824
to: 3.57199996709824 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.328000009059906
to: 15.6079999804497 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.149471 0.198568 0.121013 0.023497
0.029870 0.027781 0.023359 0.019568 [error]
Peak 0.017849 0.024634 0.019804 0.002206
0.007566 0.007171 0.006073 0.004820 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 15.936 -0.328 15.608
T90 13.360 -0.008 13.352
T50 7.440 1.928 9.368
Peak 1.000 2.572 3.572
====== 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 -1.424 -0.274 0.276 - - - 2.07e-03 -3.31e-04 3.30e-04 81.150 57
CPL -0.307 -1.235 2.074 72.897 -21.402 -72.897 7.78e-03 -7.78e-03 7.76e-02 79.300 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 -1.175 -0.624 0.692 - - - 4.12e-03 -1.36e-03 1.33e-03 59.600 57
CPL -1.184 -0.614 0.712 9999.340 -9999.340 -9999.340 4.14e-03 -4.14e-03 1.48e-02 59.600 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 3.92e-08 7.54e-08 1.12e-07 3.61e-07 3.17e-07 5.88e-07 erg/cm2
90%_error_low -1.05e-08 -1.30e-08 -2.26e-08 -1.34e-07 -5.51e-08 -1.55e-07 erg/cm2
90%_error_hi 1.13e-08 1.28e-08 2.25e-08 1.82e-07 5.60e-08 1.93e-07 erg/cm2
Peak flux PL 1.24e-01 1.52e-01 1.34e-01 2.05e-01 4.82e-01 6.15e-01 ph/cm2/s
90%_error_low -7.61e-02 -6.59e-02 -4.99e-02 -1.28e-01 -1.65e-01 -2.02e-01 ph/cm2/s
90%_error_hi 9.71e-02 6.11e-02 4.75e-02 2.30e-01 1.67e-01 2.12e-01 ph/cm2/s
Fluence CPL 3.28e-08 8.40e-08 1.16e-07 8.55e-08 2.86e-07 3.18e-07 erg/cm2
90%_error_low -1.35e-08 -1.69e-08 -2.73e-08 -6.92e-08 -6.50e-08 -9.46e-08 erg/cm2
90%_error_hi 1.38e-08 1.81e-08 2.61e-08 4.58e-07 6.84e-08 3.39e-07 erg/cm2
Peak flux CPL 1.24e-01 1.52e-01 1.34e-01 2.04e-01 4.82e-01 6.47e-01 ph/cm2/s
90%_error_low N/A N/A N/A N/A -1.65e-01 -2.80e-01 ph/cm2/s
90%_error_hi N/A N/A N/A N/A 1.67e-01 2.07e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 271.7828 11.1751 0.0195 20.0153 -120.8554 0.5042435 9.862 TRIG_00737125 Foreground time interval of the image: -0.328 15.608 (delta_t = 15.936 [sec]) Background time interval of the image: -239.064 -0.328 (delta_t = 238.736 [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 -0.328 sec. to 15.608 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.42428 ( -0.273583 0.275902 ) Norm@50keV : 2.06708E-03 ( -0.000331202 0.000330223 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 81.15 using 59 PHA bins. # Reduced chi-squared = 1.424 for 57 degrees of freedom # Null hypothesis probability = 1.949568e-02 Photon flux (15-150 keV) in 15.94 sec: 0.253159 ( -0.041307 0.041486 ) ph/cm2/s Energy fluence (15-150 keV) : 3.16882e-07 ( -5.51374e-08 5.59626e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.328 sec. to 15.608 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.30653 ( -1.23578 2.07305 ) Epeak [keV] : 72.8971 ( -21.3844 -72.8796 ) Norm@50keV : 7.77779E-03 ( -0.00778483 0.0776228 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 79.30 using 59 PHA bins. # Reduced chi-squared = 1.416 for 56 degrees of freedom # Null hypothesis probability = 2.195390e-02 Photon flux (15-150 keV) in 15.94 sec: 0.239700 ( -0.045824 0.04506 ) ph/cm2/s Energy fluence (15-150 keV) : 2.85548e-07 ( -6.50325e-08 6.84403e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.572 sec. to 3.572 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.17454 ( -0.624447 0.692138 ) Norm@50keV : 4.11713E-03 ( -0.00135768 0.00133151 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.60 using 59 PHA bins. # Reduced chi-squared = 1.046 for 57 degrees of freedom # Null hypothesis probability = 3.813640e-01 Photon flux (15-150 keV) in 1 sec: 0.481608 ( -0.164924 0.166878 ) ph/cm2/s Energy fluence (15-150 keV) : 4.20814e-08 ( -1.45004e-08 1.4694e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.572 sec. to 3.572 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.1738 ( -0.615282 0.710963 ) Epeak [keV] : 61.6752 ( -9999.36 -9999.36 ) Norm@50keV : 1.07698E-03 ( -0.00108627 0.0178457 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.08 using 59 PHA bins. # Reduced chi-squared = 1.055 for 56 degrees of freedom # Null hypothesis probability = 3.635445e-01 Photon flux (15-150 keV) in 1 sec: 0.481800 ( -0.165145 0.16661 ) ph/cm2/s Energy fluence (15-150 keV) : 4.22727e-08 ( -1.66379e-08 1.64519e-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 = -1.868250373348678E-01, IMY = 3.127144116583480E-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: -239.064000 -0.328000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9655 -15.6334 0.2 21.6 10.0 11.8103 48.1 0.9 Sco X-1 254.4101 35.5014 6.0 31.0 172.2 -0.6449 -1.9 9.8 Her X-1 255.7953 -37.9773 0.0 42.7 -14.1 -0.1829 -0.5 12.1 4U 1700-377 256.4402 -36.4075 34.6 41.1 -15.1 0.1184 0.3 1.0 GX 349+2 262.9966 -24.7310 1.5 31.0 -28.9 2.3742 7.9 1.1 GX 1+4 264.7815 -44.3356 4.0 50.1 -21.8 1.5685 2.9 7.1 4U 1735-44 268.5103 -1.5053 10.8 16.9 -79.8 0.2870 1.1 9.1 SW J1753.5-0127 270.1175 -25.2139 7.3 34.3 -39.3 0.5530 1.6 12.1 GX 5-1 270.4536 -25.7511 5.3 34.9 -39.2 0.7947 2.2 8.2 GRS 1758-258 273.9628 -14.0524 5.1 28.2 -58.7 0.7592 2.2 2.7 GX 17+2 276.0447 -30.4966 0.0 41.6 -41.5 -1.0939 -2.5 9.9 H1820-303 284.8499 -25.0507 75.5 43.1 -55.4 -0.1094 -0.2 12.8 HT1900.1-2455 288.7804 10.9319 1.8 36.3 -112.8 3.4601 6.4 1.3 GRS 1915+105 299.6389 35.1958 4.9 53.0 -142.1 3.8322 2.4 2.4 Cyg X-1 262.8163 -33.9729 4.9 39.7 -23.7 -0.8314 -2.3 12.0 GX 354-0 230.5465 20.8057 3.5 26.9 118.4 1.2876 3.3 ------ UNKNOWN 227.6890 -34.3084 3.2 45.5 18.8 1.9696 3.6 ------ UNKNOWN 255.1060 58.4253 2.5 53.9 171.1 5.6150 4.6 ------ UNKNOWN 233.2301 -48.0869 3.9 55.4 5.2 3.7950 3.0 ------ UNKNOWN 259.8936 -25.0225 0.6 30.4 -23.5 5.7987 20.0 ------ UNKNOWN 277.1978 3.5141 3.1 24.5 -98.9 1.1003 3.7 ------ UNKNOWN UNKNOWN UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.328000 15.608000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.8659 -15.4640 0.0 21.5 10.5 -0.0514 -1.1 12.4 Sco X-1 254.5743 35.1734 0.0 30.6 172.5 -0.1127 -2.0 11.6 Her X-1 255.8031 -37.9673 12.0 42.7 -14.1 0.0719 1.0 11.4 4U 1700-377 256.2601 -36.5097 44.6 41.2 -14.9 0.0177 0.3 9.9 GX 349+2 263.0261 -24.8271 5.7 31.1 -28.9 -0.1070 -2.0 5.0 GX 1+4 264.7221 -44.4936 6.5 50.3 -21.7 -0.2032 -1.8 2.8 4U 1735-44 268.5027 -1.5429 4.1 17.0 -79.7 0.1396 2.8 9.7 SW J1753.5-0127 270.2280 -24.9372 3.5 34.1 -39.7 -0.2251 -3.3 9.0 GX 5-1 270.4767 -25.6591 8.2 34.8 -39.3 -0.0989 -1.4 10.7 GRS 1758-258 274.1421 -14.1149 3.3 28.3 -58.9 0.2253 3.5 9.2 GX 17+2 275.8511 -30.4313 4.4 41.4 -41.3 -0.2342 -2.6 5.4 H1820-303 285.1671 -24.9984 7.4 43.3 -55.8 -0.2229 -1.6 8.5 HT1900.1-2455 288.6405 10.9163 6.1 36.2 -112.8 -0.1783 -1.9 9.5 GRS 1915+105 299.4868 35.1019 5.7 52.8 -142.1 0.4980 2.0 7.8 Cyg X-1 263.1809 -33.6972 0.0 39.6 -24.3 -0.0281 -0.4 12.6 GX 354-0 244.7086 21.9567 2.6 19.0 146.2 0.2207 4.4 ------ UNKNOWN 275.3432 34.1542 2.3 36.3 -157.9 0.2909 4.9 ------ UNKNOWN 271.7828 11.1751 1.2 20.0 -120.9 0.5043 9.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 85.236600 963.056000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9775 -15.6400 0.3 37.7 17.6 39.6985 37.1 0.1 Sco X-1 254.2408 35.2592 6.7 28.8 121.9 -2.2040 -1.7 11.7 Her X-1 255.8295 -37.9469 23.9 51.4 -11.4 0.9714 0.5 9.7 4U 1700-377 256.4373 -36.5393 5.7 49.9 -11.4 3.0527 2.0 7.0 GX 349+2 263.0445 -24.7448 1.1 37.0 -14.3 10.1946 10.9 1.9 GX 1+4 264.6037 -44.4687 9.7 56.1 -21.3 -3.5371 -1.2 6.1 4U 1735-44 268.4537 -1.5397 7.2 13.2 -12.9 1.2343 1.6 7.3 SW J1753.5-0127 270.3222 -25.1389 10.6 36.4 -25.3 1.1209 1.1 4.1 GX 5-1 270.1699 -25.7370 9.3 37.0 -25.1 1.2555 1.2 7.2 GRS 1758-258 274.0162 -13.9814 1.7 25.3 -32.6 5.2609 6.7 3.4 GX 17+2 276.1616 -30.2913 0.0 41.7 -33.2 0.9209 0.7 13.1 H1820-303 285.2022 -24.9374 8.4 38.5 -47.3 1.8338 1.4 9.1 HT1900.1-2455 288.8074 10.9241 0.7 16.7 -118.1 13.8470 16.9 1.4 GRS 1915+105 299.5851 35.2102 0.3 34.8 -165.6 31.3211 33.0 0.6 Cyg X-1 308.1089 40.9826 2.5 43.6 -167.0 7.0160 4.5 1.8 Cyg X-3 326.1040 38.3400 16.0 55.3 -156.7 3.3286 0.7 3.4 Cyg X-2 262.9252 -33.9605 7.0 46.0 -17.3 2.3613 1.6 8.2 GX 354-0 249.4432 33.6474 2.8 30.3 113.7 5.1796 4.2 ------ UNKNOWN 249.4138 -10.5645 2.9 31.1 18.8 3.3355 4.0 ------ UNKNOWN 259.9173 -25.0248 0.5 38.1 -9.9 22.2490 22.8 ------ UNKNOWN 323.7161 49.8600 3.5 57.4 -170.4 18.9293 3.3 ------ UNKNOWN UNKNOWN