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 Jun 21 15:37:39 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger755354
======================================================================
Trigger: 00755354 Segment: 000
BAT Trigger Time: 517960948.352 [s; MET]
Trigger Stop: 517960960.512 [s; MET]
UTC: 2017-05-31T22:02:09.205660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 286.89460992882 Dec: -16.426493667783 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.47
Image Trigger?: NO
Rate S/N Ratio: 10.0498756211209 [ if not an image trigger ]
Image S/N Ratio: 9.47
Analysis Position: [ source = BAT ]
RA: 286.89460992882 Dec: -16.426493667783 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 286.899373486008 Dec: -16.4092626199341 [deg; J2000]
{ 19h 07m 35.8s , -16d 24' 33.3" }
+/- 1.53624884202434 [arcmin] (estimated 90% radius based on SNR)
+/- 0.679297089129446 [arcmin] (formal 1-sigma fit error)
SNR: 16.4719384441095
Angular difference between the analysis and refined position is 1.069596 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 170.29599994421 +/- 9.10601472374974
Measured from: 4.28799998760223
to: 174.583999931812 [s; relative to TRIGTIME]
T50: 134.255999922752 +/- 5.27546206809869
Measured from: 24.4120000004768
to: 158.667999923229 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 42.7080000042915
to: 43.7080000042915 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.240000009536743
to: 181.560000002384 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.298644 1.418865 0.771787 -0.051559
0.098181 0.093015 0.082313 0.083366 [error]
Peak 0.035764 0.036264 0.019044 0.011116
0.007999 0.007313 0.006313 0.006375 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 181.320 0.240 181.560
T90 170.296 4.288 174.584
T50 134.256 24.412 158.668
Peak 1.000 42.708 43.708
====== 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 -1.937 -0.149 0.145 - - - 1.15e-03 -1.09e-04 1.08e-04 42.160 57
CPL -1.216 -0.586 0.682 45.166 -10.771 24.517 2.98e-03 -1.58e-03 4.35e-03 37.570 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 -1.724 -0.470 0.455 - - - 5.57e-03 -1.53e-03 1.46e-03 54.200 57
CPL -1.731 -0.290 0.466 9999.360 N/A N/A 5.55e-03 N/A N/A 54.200 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 4.01e-07 5.66e-07 5.91e-07 1.14e-06 1.92e-06 2.69e-06 erg/cm2
90%_error_low -4.50e-08 -4.34e-08 -7.66e-08 -2.71e-07 -1.75e-07 -3.57e-07 erg/cm2
90%_error_hi 4.61e-08 4.35e-08 7.81e-08 3.25e-07 1.78e-07 3.99e-07 erg/cm2
Peak flux PL 2.84e-01 2.51e-01 1.52e-01 1.39e-01 7.46e-01 8.25e-01 ph/cm2/s
90%_error_low -1.05e-01 -6.00e-02 -5.34e-02 -7.77e-02 -1.77e-01 -1.96e-01 ph/cm2/s
90%_error_hi 1.13e-01 5.95e-02 5.44e-02 1.28e-01 1.77e-01 1.98e-01 ph/cm2/s
Fluence CPL 3.75e-07 6.12e-07 5.65e-07 3.44e-07 1.76e-06 1.90e-06 erg/cm2
90%_error_low -5.09e-08 -5.67e-08 -9.25e-08 -2.04e-07 -1.99e-07 -2.92e-07 erg/cm2
90%_error_hi 5.12e-08 5.82e-08 8.84e-08 5.28e-07 2.10e-07 5.63e-07 erg/cm2
Peak flux CPL 2.87e-01 2.48e-01 1.52e-01 1.38e-01 7.50e-01 8.44e-01 ph/cm2/s
90%_error_low -1.11e-01 -5.91e-02 -5.49e-02 N/A -1.87e-01 -2.24e-01 ph/cm2/s
90%_error_hi 1.17e-01 7.22e-02 5.63e-02 N/A 1.77e-01 1.73e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 286.8994 -16.4093 0.0117 20.4338 -150.3150 2.0491415 16.472 TRIG_00755354 Foreground time interval of the image: 0.240 62.349 (delta_t = 62.109 [sec]) Background time interval of the image: -512.151 -493.100 (delta_t = 19.052 [sec]) -239.352 0.240 (delta_t = 239.592 [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 0.240 sec. to 181.560 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.93735 ( -0.149438 0.14488 ) Norm@50keV : 1.14833E-03 ( -0.000109282 0.00010774 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 42.16 using 59 PHA bins. # Reduced chi-squared = 0.7397 for 57 degrees of freedom # Null hypothesis probability = 9.290725e-01 Photon flux (15-150 keV) in 181.3 sec: 0.167485 ( -0.012934 0.01294 ) ph/cm2/s Energy fluence (15-150 keV) : 1.91556e-06 ( -1.75046e-07 1.78492e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.240 sec. to 181.560 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.21562 ( -0.585574 0.6821 ) Epeak [keV] : 45.1658 ( -10.7706 24.5168 ) Norm@50keV : 2.98146E-03 ( -0.00157951 0.00434873 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.57 using 59 PHA bins. # Reduced chi-squared = 0.6708 for 56 degrees of freedom # Null hypothesis probability = 9.723188e-01 Photon flux (15-150 keV) in 181.3 sec: 0.161710 ( -0.013623 0.013663 ) ph/cm2/s Energy fluence (15-150 keV) : 1.76245e-06 ( -1.98558e-07 2.10323e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 42.708 sec. to 43.708 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.72435 ( -0.470371 0.454524 ) Norm@50keV : 5.56784E-03 ( -0.00152857 0.00146256 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.20 using 59 PHA bins. # Reduced chi-squared = 0.9509 for 57 degrees of freedom # Null hypothesis probability = 5.806945e-01 Photon flux (15-150 keV) in 1 sec: 0.745908 ( -0.176584 0.176925 ) ph/cm2/s Energy fluence (15-150 keV) : 5.14671e-08 ( -1.41807e-08 1.48705e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 42.708 sec. to 43.708 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.01649 ( -0.00502127 0.750696 ) Epeak [keV] : 6.91250 ( ) Norm@50keV : 3.88046E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.14 using 59 PHA bins. # Reduced chi-squared = 0.9667 for 56 degrees of freedom # Null hypothesis probability = 5.457509e-01 Photon flux (15-150 keV) in 1 sec: 0.749671 ( -0.186521 0.177328 ) ph/cm2/s Energy fluence (15-150 keV) : 5.19505e-08 ( -1.78532e-08 1.49193e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 170.296 sec. Hardness ratio (energy fluence ratio) = 1.04443139388
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 9.671374e-07 S(50-150 keV) = 9.484624e-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 = -3.236722325517952E-01, IMY = 1.845073450929686E-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: -512.151410 -493.099600 -239.352000 0.240000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9800 -15.6428 0.3 22.5 70.1 17.2208 41.2 0.2 Sco X-1 255.9688 -37.8266 0.7 16.0 -6.7 5.5549 15.6 1.3 4U 1700-377 256.3074 -36.3520 3.4 14.7 -3.9 1.2103 3.4 7.5 GX 349+2 262.9898 -24.7637 2.1 3.6 50.4 1.7567 5.5 1.5 GX 1+4 264.8829 -44.4949 6.9 19.7 -35.4 0.6354 1.7 6.6 4U 1735-44 268.3492 -1.2609 5.2 23.6 143.6 -0.8865 -2.2 11.6 SW J1753.5-0127 270.3356 -25.0755 2.6 3.1 -124.5 1.5195 4.4 2.8 GX 5-1 270.2902 -25.8023 5.7 3.2 -111.2 0.7220 2.0 3.6 GRS 1758-258 273.9780 -14.0208 3.2 12.7 172.9 1.2532 3.6 1.9 GX 17+2 276.0623 -30.2701 6.1 9.7 -93.8 0.6330 1.9 9.2 H1820-303 285.0521 -24.7554 7.8 16.4 -126.2 -0.5221 -1.5 9.9 HT1900.1-2455 288.8209 10.7939 7.9 41.5 173.7 0.8848 1.5 9.2 GRS 1915+105 263.1135 -33.8260 11.8 9.6 -20.2 0.3310 1.0 6.2 GX 354-0 250.0184 -19.2517 3.2 16.7 66.4 1.2616 3.7 ------ UNKNOWN 284.0904 10.0631 3.3 38.7 167.8 1.8744 3.5 ------ UNKNOWN 259.9091 -25.0163 1.0 6.4 47.1 4.0288 11.6 ------ UNKNOWN 294.5620 16.3724 2.4 49.2 176.1 4.2387 4.8 ------ UNKNOWN 224.8963 -53.5194 2.8 42.4 -3.6 2.3767 4.1 ------ UNKNOWN 278.9189 -20.3139 3.1 11.9 -149.7 1.1847 3.7 ------ UNKNOWN 234.1752 -65.2798 2.6 45.5 -21.3 2.6157 4.4 ------ UNKNOWN 303.5279 -6.8955 2.8 39.3 -150.7 2.2466 4.1 ------ UNKNOWN UNKNOWN UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.240000 62.348600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.8197 -15.6763 5.1 22.7 69.8 -0.3434 -2.3 9.5 Sco X-1 255.9348 -37.8083 4.4 16.0 -6.6 -0.3199 -2.6 3.3 4U 1700-377 256.5048 -36.4057 10.0 14.6 -4.5 -0.1437 -1.2 3.5 GX 349+2 263.0009 -24.9392 8.4 3.6 47.7 -0.1703 -1.4 11.6 GX 1+4 264.6485 -44.5485 4.9 19.8 -34.9 0.2986 2.4 7.2 4U 1735-44 268.5326 -1.4818 10.3 23.4 144.1 -0.1652 -1.1 10.0 SW J1753.5-0127 270.5088 -25.0493 97.8 3.2 -125.2 -0.0138 -0.1 12.3 GX 5-1 270.2362 -25.7204 11.6 3.1 -112.4 0.1167 1.0 3.8 GRS 1758-258 274.0362 -13.9069 5.2 12.8 172.8 0.2721 2.2 8.0 GX 17+2 276.0553 -30.4677 6.2 9.8 -92.8 -0.2368 -1.9 9.1 H1820-303 285.0896 -25.1269 0.0 16.4 -124.9 -0.0825 -0.6 12.7 HT1900.1-2455 288.8750 10.8595 5.0 41.6 173.7 -0.4656 -2.3 6.9 GRS 1915+105 262.9486 -33.9422 132.9 9.8 -19.7 0.0104 0.1 6.8 GX 354-0 267.7826 -16.9818 3.0 7.9 145.9 0.4498 3.9 ------ UNKNOWN 286.8994 -16.4092 0.7 20.4 -150.3 2.0490 16.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 127.948600 962.718000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9814 -15.6765 0.8 40.2 100.2 48.7059 13.7 2.2 Sco X-1 256.0063 -37.8533 1.5 34.6 60.9 12.1913 7.6 1.1 4U 1700-377 256.4904 -36.2948 10.4 33.5 63.0 -1.6071 -1.1 8.1 GX 349+2 263.0177 -24.7545 1.9 23.8 80.9 5.8733 6.2 0.7 GX 1+4 264.6171 -44.3091 19.2 33.6 44.6 0.7156 0.6 10.0 4U 1735-44 268.4522 -1.5810 8.8 23.5 142.6 -1.0844 -1.3 9.2 SW J1753.5-0127 270.2768 -25.1190 2.4 17.8 73.3 3.9542 4.9 2.4 GX 5-1 270.3592 -25.6793 6.4 18.0 71.6 1.6466 2.0 4.9 GRS 1758-258 274.1240 -14.0427 3.2 12.6 114.5 3.2460 3.6 6.9 GX 17+2 275.8547 -30.5121 3.6 17.3 49.0 2.6837 3.2 9.4 H1820-303 284.9402 -25.0970 5.6 8.9 27.0 -1.5684 -2.0 11.8 HT1900.1-2455 288.7859 10.9013 4.5 27.4 -160.8 2.1724 2.6 2.8 GRS 1915+105 299.6168 35.1801 1.4 53.0 -151.8 27.1565 8.6 1.8 Cyg X-1 262.8954 -33.9187 5.6 27.8 61.7 2.1050 2.1 6.9 GX 354-0 259.8829 -25.0239 1.0 26.6 82.0 11.5129 11.0 ------ UNKNOWN 272.4436 -26.4244 4.0 16.8 66.2 2.1104 2.9 ------ UNKNOWN 291.8280 -39.5958 2.6 23.5 5.8 3.2843 4.4 ------ UNKNOWN 314.9822 22.9555 3.2 48.0 -129.1 18.2210 3.6 ------ UNKNOWN 317.7531 17.2576 3.5 45.4 -121.3 15.9537 3.3 ------ UNKNOWN