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: Tue Apr 25 16:32:50 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger744773
======================================================================
Trigger: 00744773 Segment: 000
BAT Trigger Time: 512605810.176 [s; MET]
Trigger Stop: 512605814.272 [s; MET]
UTC: 2017-03-30T22:29:51.341320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 283.326251844694 Dec: -13.4370573410381 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.35
Image Trigger?: NO
Rate S/N Ratio: 18.6547581061776 [ if not an image trigger ]
Image S/N Ratio: 9.35
Analysis Position: [ source = BAT ]
RA: 283.326251844694 Dec: -13.4370573410381 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 283.323263473062 Dec: -13.4483178419652 [deg; J2000]
{ 18h 53m 17.6s , -13d 26' 53.9" }
+/- 1.45034862873674 [arcmin] (estimated 90% radius based on SNR)
+/- 0.622082567720576 [arcmin] (formal 1-sigma fit error)
SNR: 17.8831290455553
Angular difference between the analysis and refined position is 0.697773 arcmin
Partial Coding Fraction: 0.4648438 [ including projection effects ]
Duration
T90: 144.46799993515 +/- 2.18785005650547
Measured from: -141.167999982834
to: 3.29999995231628 [s; relative to TRIGTIME]
T50: 109.767999947071 +/- 2.90593321125023
Measured from: -135.315999984741
to: -25.5480000376701 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -134.708000004292
to: -133.708000004292 [s; relative to TRIGTIME]
Total Fluence
Measured from: -143.864000022411
to: 7.97200000286102 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.000650 2.867526 2.591856 0.852053
0.112916 0.114838 0.098997 0.083849 [error]
Peak 0.104025 0.183294 0.224516 0.073554
0.010609 0.011464 0.011670 0.008684 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 151.836 -143.864 7.972
T90 144.468 -141.168 3.300
T50 109.768 -135.316 -25.548
Peak 1.000 -134.708 -133.708
====== 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 -1.333 -0.077 0.078 - - - 3.70e-03 -1.53e-04 1.53e-04 37.360 57
CPL -1.291 -0.114 0.237 925.309 -925.309 -925.309 3.87e-03 -3.10e-04 -2.59e-06 37.510 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 -1.027 -0.103 0.104 - - - 3.96e-02 -2.41e-03 2.41e-03 58.200 57
CPL -0.559 -0.408 0.454 183.251 -61.812 683.907 6.30e-02 -2.06e-02 3.38e-02 54.330 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 6.13e-07 1.25e-06 1.98e-06 6.99e-06 5.51e-06 1.08e-05 erg/cm2
90%_error_low -5.16e-08 -6.20e-08 -9.76e-08 -7.67e-07 -2.43e-07 -8.21e-07 erg/cm2
90%_error_hi 5.32e-08 6.16e-08 9.73e-08 8.33e-07 2.44e-07 8.74e-07 erg/cm2
Peak flux PL 1.04e+00 1.39e+00 1.36e+00 2.40e+00 4.57e+00 6.18e+00 ph/cm2/s
90%_error_low -1.26e-01 -1.06e-01 -8.83e-02 -3.18e-01 -2.85e-01 -3.98e-01 ph/cm2/s
90%_error_hi 1.32e-01 1.05e-01 8.78e-02 3.47e-01 2.85e-01 4.04e-01 ph/cm2/s
Fluence CPL 6.16e-07 1.25e-06 1.98e-06 7.16e-06 5.51e-06 1.09e-05 erg/cm2
90%_error_low N/A -6.21e-08 -1.01e-07 -2.33e-06 -2.73e-07 -2.46e-06 erg/cm2
90%_error_hi N/A 6.57e-08 1.21e-07 2.64e-07 2.55e-07 4.08e-07 erg/cm2
Peak flux CPL 9.09e-01 1.41e+00 1.44e+00 1.58e+00 4.48e+00 5.35e+00 ph/cm2/s
90%_error_low -1.62e-01 -1.13e-01 -1.13e-01 -4.61e-01 -2.94e-01 -5.60e-01 ph/cm2/s
90%_error_hi 1.69e-01 1.14e-01 1.15e-01 7.05e-01 2.94e-01 7.51e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 283.3233 -13.4483 0.0108 27.2186 87.7392 3.2332168 17.883 TRIG_00744773 Foreground time interval of the image: -69.675 7.972 (delta_t = 77.647 [sec]) Background time interval of the image:
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 -143.864 sec. to 7.972 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.3333 ( -0.0773998 0.0778339 ) Norm@50keV : 3.69883E-03 ( -0.000153455 0.000153414 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.36 using 59 PHA bins. # Reduced chi-squared = 0.6555 for 57 degrees of freedom # Null hypothesis probability = 9.794295e-01 Photon flux (15-150 keV) in 151.8 sec: 0.444107 ( -0.019985 0.020072 ) ph/cm2/s Energy fluence (15-150 keV) : 5.50544e-06 ( -2.43062e-07 2.43689e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -143.864 sec. to 7.972 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.32957 ( -0.0833196 0.26826 ) Epeak [keV] : 1.00000E+04 ( -10000 -10000 ) Norm@50keV : 3.71356E-03 ( -0.000153792 0.000153782 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.37 using 59 PHA bins. # Reduced chi-squared = 0.6673 for 56 degrees of freedom # Null hypothesis probability = 9.738186e-01 Photon flux (15-150 keV) in 151.8 sec: 0.444792 ( -0.022792 0.020778 ) ph/cm2/s Energy fluence (15-150 keV) : 5.51356e-06 ( -2.72829e-07 2.54795e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -134.708 sec. to -133.708 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.02661 ( -0.103061 0.104324 ) Norm@50keV : 3.96144E-02 ( -0.00241224 0.00240747 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.20 using 59 PHA bins. # Reduced chi-squared = 1.021 for 57 degrees of freedom # Null hypothesis probability = 4.309675e-01 Photon flux (15-150 keV) in 1 sec: 4.56788 ( -0.28473 0.28519 ) ph/cm2/s Energy fluence (15-150 keV) : 4.24444e-07 ( -2.73988e-08 2.74952e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -134.708 sec. to -133.708 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.559419 ( -0.408432 0.453776 ) Epeak [keV] : 183.251 ( -61.8113 683.907 ) Norm@50keV : 6.30008E-02 ( -0.0205832 0.0338109 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.33 using 59 PHA bins. # Reduced chi-squared = 0.9702 for 56 degrees of freedom # Null hypothesis probability = 5.382716e-01 Photon flux (15-150 keV) in 1 sec: 4.48472 ( -0.29358 0.29389 ) ph/cm2/s Energy fluence (15-150 keV) : 4.18042e-07 ( -2.85308e-08 2.84257e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 144.468 sec. Hardness ratio (energy fluence ratio) = 1.58744957174
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.8616911e-06 S(50-150 keV) = 3.643705e-06
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 = 2.028951154618287E-02, IMY = -5.139404562040610E-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:
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -69.675400 7.972000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 270.1403 -25.0756 83.0 41.3 70.3 -0.0659 -0.1 7.8 GX 5-1 270.3229 -25.6262 11.7 41.2 69.4 -0.4928 -1.0 7.1 GRS 1758-258 273.9973 -14.0396 99.0 36.3 87.1 0.0381 0.1 0.5 GX 17+2 276.0219 -30.3883 5.1 38.0 59.9 0.6571 2.3 5.2 H1820-303 284.9799 -24.7798 5.9 28.4 63.2 0.3500 1.9 9.0 HT1900.1-2455 288.7708 10.9204 2.5 31.0 140.0 0.8324 4.7 2.2 GRS 1915+105 299.6083 35.2095 1.1 47.2 173.5 3.1489 10.1 1.0 Cyg X-1 308.2200 40.9409 5.0 51.8 -176.4 0.8906 2.3 5.0 Cyg X-3 326.0744 38.4732 93.0 51.2 -158.6 0.0438 0.1 10.2 Cyg X-2 283.3233 -13.4483 0.6 27.2 87.7 3.2325 17.9 ------ UNKNOWN 339.2962 -62.5173 2.2 55.6 -9.1 2.2992 5.1 ------ UNKNOWN 332.2487 40.7934 3.4 55.1 -154.2 2.3839 3.4 ------ UNKNOWN 356.0803 -24.1431 2.9 44.8 -60.2 2.3391 4.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 87.724610 962.978300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9623 -15.6254 1.1 37.2 86.9 26.3455 10.3 1.3 Sco X-1 255.9985 -37.8232 0.9 34.4 45.0 18.1812 12.6 1.4 4U 1700-377 256.5070 -36.5168 3.9 33.3 46.5 4.0443 3.0 6.6 GX 349+2 262.9985 -24.7277 1.8 22.3 61.6 5.6212 6.3 1.2 GX 1+4 264.7965 -44.6020 6.3 34.9 28.4 2.1768 1.8 9.4 4U 1735-44 268.2182 -1.3190 0.0 19.3 132.8 -1.3014 -1.5 12.0 SW J1753.5-0127 270.4476 -25.0981 16.7 16.8 49.4 0.5717 0.7 9.0 GX 5-1 270.1382 -25.7156 6.6 17.5 48.5 1.4576 1.8 9.0 GRS 1758-258 274.1173 -13.8826 4.7 9.0 91.2 1.7521 2.4 11.3 GX 17+2 275.8526 -30.2742 11.4 18.2 26.3 0.7270 1.0 6.7 H1820-303 285.1810 -24.7566 0.0 11.4 -3.3 0.2940 0.3 12.6 HT1900.1-2455 288.7539 10.9091 1.5 24.9 -162.3 6.1063 7.6 3.4 GRS 1915+105 299.6008 35.1906 1.0 51.0 -157.8 27.1484 11.3 0.8 Cyg X-1 262.8719 -33.9662 10.6 27.7 43.8 1.0557 1.1 9.8 GX 354-0 259.8938 -25.0180 0.7 24.9 64.0 16.4395 16.7 ------ UNKNOWN 268.4515 36.3519 2.6 51.7 169.8 11.2337 4.4 ------ UNKNOWN 285.5894 -65.3992 3.3 52.0 3.9 6.6416 3.5 ------ UNKNOWN 309.2001 -65.7325 3.7 55.1 -7.5 8.2662 3.1 ------ UNKNOWN 323.8371 -54.8663 4.9 52.0 -23.2 5.0189 2.4 ------ UNKNOWN 329.3638 -38.6414 5.3 47.7 -44.3 8.7157 2.2 ------ UNKNOWN 319.6049 10.3433 3.8 43.1 -116.6 12.3461 3.1 ------ UNKNOWN