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 15:03:10 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger741220
======================================================================
Trigger: 00741220 Segment: 000
BAT Trigger Time: 510476791.232 [s; MET]
Trigger Stop: 510476799.424 [s; MET]
UTC: 2017-03-06T07:06:12.520600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 263.081790843115 Dec: -44.747485901374 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.15
Image Trigger?: NO
Rate S/N Ratio: 7.41619848709566 [ if not an image trigger ]
Image S/N Ratio: 7.15
Analysis Position: [ source = BAT ]
RA: 263.081790843115 Dec: -44.747485901374 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 263.091716603115 Dec: -44.759032795071 [deg; J2000]
{ 17h 32m 22.0s , -44d 45' 32.5" }
+/- 2.43940676950167 [arcmin] (estimated 90% radius based on SNR)
+/- 1.19261220423033 [arcmin] (formal 1-sigma fit error)
SNR: 8.50854307572622
Angular difference between the analysis and refined position is 0.811699 arcmin
Partial Coding Fraction: 0.2929688 [ including projection effects ]
Duration
T90: 21.0079999566078 +/- 6.52745339366034
Measured from: -3.33200001716614
to: 17.6759999394417 [s; relative to TRIGTIME]
T50: 9.35599994659424 +/- 2.70860258562494
Measured from: 1.43599998950958
to: 10.7919999361038 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.24400001764297
to: 2.24400001764297 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.03600001335144
to: 19.283999979496 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.394195 0.645940 0.274547 0.035588
0.074179 0.071154 0.059009 0.047735 [error]
Peak 0.050171 0.040132 0.021823 0.011275
0.014170 0.014350 0.011190 0.009545 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 26.320 -7.036 19.284
T90 21.008 -3.332 17.676
T50 9.356 1.436 10.792
Peak 1.000 1.244 2.244
====== 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 -1.882 -0.270 0.257 - - - 3.55e-03 -5.77e-04 5.65e-04 54.440 57
CPL -1.667 -0.644 1.249 71.748 N/A N/A 4.63e-03 N/A N/A 54.310 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 -2.120 -0.732 0.594 - - - 6.42e-03 -2.96e-03 2.80e-03 82.390 57
CPL -0.725 -1.419 5.651 40.377 N/A N/A 3.87e-02 N/A N/A 81.450 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 1.71e-07 2.49e-07 2.70e-07 5.48e-07 8.58e-07 1.24e-06 erg/cm2
90%_error_low -3.82e-08 -3.66e-08 -5.83e-08 -2.09e-07 -1.37e-07 -2.74e-07 erg/cm2
90%_error_hi 4.03e-08 3.65e-08 5.81e-08 2.78e-07 1.38e-07 3.22e-07 erg/cm2
Peak flux PL 4.81e-01 3.37e-01 1.55e-01 9.95e-02 1.02e+00 1.07e+00 ph/cm2/s
90%_error_low -2.31e-01 -1.24e-01 -8.51e-02 -9.95e-02 -3.82e-01 -3.97e-01 ph/cm2/s
90%_error_hi 2.56e-01 1.25e-01 8.85e-02 1.37e-01 3.83e-01 3.97e-01 ph/cm2/s
Fluence CPL N/A 2.55e-07 2.72e-07 5.09e-07 8.37e-07 1.13e-06 erg/cm2
90%_error_low -3.82e-08 -4.21e-08 -5.97e-08 N/A -2.29e-07 N/A erg/cm2
90%_error_hi 4.03e-08 4.97e-08 6.16e-08 N/A 1.35e-07 N/A erg/cm2
Peak flux CPL 4.11e-01 3.96e-01 1.63e-01 2.66e-02 9.92e-01 9.96e-01 ph/cm2/s
90%_error_low -2.65e-01 -1.60e-01 -1.10e-01 -2.66e-02 -3.83e-01 -3.87e-01 ph/cm2/s
90%_error_hi 2.80e-01 1.84e-01 1.09e-01 1.53e-01 3.86e-01 4.00e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 263.0917 -44.7590 0.0225 45.8572 13.7708 1.2257386 8.509 TRIG_00741220 Foreground time interval of the image: -7.036 19.284 (delta_t = 26.320 [sec]) Background time interval of the image: -178.931 -7.036 (delta_t = 171.895 [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 -7.036 sec. to 19.284 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.88167 ( -0.269906 0.257467 ) Norm@50keV : 3.54576E-03 ( -0.000577497 0.000564534 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.44 using 59 PHA bins. # Reduced chi-squared = 0.9551 for 57 degrees of freedom # Null hypothesis probability = 5.717058e-01 Photon flux (15-150 keV) in 26.32 sec: 0.504971 ( -0.076193 0.076449 ) ph/cm2/s Energy fluence (15-150 keV) : 8.58056e-07 ( -1.36972e-07 1.38464e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.036 sec. to 19.284 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.66681 ( -0.644438 1.24913 ) Epeak [keV] : 71.7478 ( ) Norm@50keV : 4.63430E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.31 using 59 PHA bins. # Reduced chi-squared = 0.9698 for 56 degrees of freedom # Null hypothesis probability = 5.390680e-01 Photon flux (15-150 keV) in 26.32 sec: 0.500716 ( -0.078837 0.078658 ) ph/cm2/s Energy fluence (15-150 keV) : 8.37484e-07 ( -2.29341e-07 1.34851e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.244 sec. to 2.244 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.12037 ( -0.732558 0.593784 ) Norm@50keV : 6.42456E-03 ( -0.00296178 0.0028003 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 82.39 using 59 PHA bins. # Reduced chi-squared = 1.445 for 57 degrees of freedom # Null hypothesis probability = 1.555948e-02 Photon flux (15-150 keV) in 1 sec: 1.02109 ( -0.381932 0.38328 ) ph/cm2/s Energy fluence (15-150 keV) : 5.98315e-08 ( -2.41535e-08 2.5026e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.244 sec. to 2.244 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.724826 ( -1.41898 5.65139 ) Epeak [keV] : 40.3769 ( ) Norm@50keV : 3.86916E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 81.45 using 59 PHA bins. # Reduced chi-squared = 1.454 for 56 degrees of freedom # Null hypothesis probability = 1.480589e-02 Photon flux (15-150 keV) in 1 sec: 0.991941 ( -0.383253 0.386169 ) ph/cm2/s Energy fluence (15-150 keV) : 5.65601e-08 ( -2.33775e-08 2.5511e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 21.008 sec. Hardness ratio (energy fluence ratio) = 1.08552519448
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.194894e-07 S(50-150 keV) = 4.385821e-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 = 1.000760744965854E+00, IMY = -2.452696419196403E-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: -178.931400 -7.036000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 255.8270 -37.9123 9.8 44.9 26.0 -0.5490 -1.2 8.6 4U 1700-377 256.3324 -36.2884 10.3 43.6 27.5 -0.5323 -1.1 9.5 GX 349+2 263.0422 -24.7067 2.9 32.1 37.4 1.1895 4.0 3.0 GX 1+4 264.5442 -44.5288 5.2 45.0 12.8 0.9401 2.2 9.7 4U 1735-44 268.4031 -1.6051 6.7 21.5 86.4 0.4402 1.7 9.4 SW J1753.5-0127 270.4097 -25.0866 3.3 27.1 28.4 0.7740 3.5 6.8 GX 5-1 270.3415 -25.7771 12.0 27.7 27.5 0.2130 1.0 2.9 GRS 1758-258 274.0054 -14.0313 2.1 17.8 46.7 1.1599 5.5 0.3 GX 17+2 276.0583 -30.4292 59.8 28.3 12.9 0.0447 0.2 7.8 H1820-303 284.9753 -24.9980 9.1 20.3 -0.1 0.2681 1.3 5.7 HT1900.1-2455 288.7755 10.9202 1.1 16.2 164.3 2.0105 10.3 2.0 GRS 1915+105 299.6089 35.2033 1.0 41.5 179.7 4.2289 12.0 0.9 Cyg X-1 308.1415 40.9165 5.6 49.1 -174.1 -1.1133 -2.1 2.6 Cyg X-3 326.0987 38.2948 4.0 55.1 -157.9 3.1109 2.8 3.8 Cyg X-2 263.1480 -33.8274 2.8 37.7 24.8 -1.3107 -4.2 7.9 GX 354-0 259.9092 -25.0487 1.1 34.8 39.6 3.7443 11.0 ------ UNKNOWN 282.5407 -19.5021 3.2 15.9 12.9 0.7113 3.7 ------ UNKNOWN 287.3405 -37.3508 2.1 32.2 -9.0 1.2222 5.4 ------ UNKNOWN 295.3421 -57.7430 3.0 52.7 -16.3 1.9833 3.8 ------ UNKNOWN 332.6897 9.5060 2.8 45.3 -121.4 3.9506 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -7.036000 19.284000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 256.0730 -37.8924 48.0 44.7 25.8 0.0380 0.2 5.0 4U 1700-377 256.3583 -36.2909 3.9 43.6 27.5 0.4394 3.0 8.8 GX 349+2 263.0120 -24.5913 6.5 32.1 37.7 0.1835 1.8 9.3 GX 1+4 264.8200 -44.6249 49.0 45.0 12.5 -0.0308 -0.2 11.0 4U 1735-44 268.4840 -1.3469 6.6 21.5 87.1 -0.1496 -1.8 9.4 SW J1753.5-0127 270.1829 -24.8888 0.0 27.1 29.1 -0.0431 -0.6 12.7 GX 5-1 270.4379 -25.7228 3.9 27.6 27.4 -0.2389 -3.0 7.4 GRS 1758-258 273.9034 -13.8700 86.5 17.8 47.3 -0.0092 -0.1 11.6 GX 17+2 275.9102 -30.2056 7.7 28.2 13.3 -0.1118 -1.5 9.7 H1820-303 284.9446 -24.8430 9.7 20.1 0.1 0.0764 1.2 6.8 HT1900.1-2455 288.6889 11.1210 0.0 16.4 164.0 -0.0723 -1.1 12.3 GRS 1915+105 299.6746 35.0273 0.0 41.3 179.9 0.1069 1.0 11.2 Cyg X-1 308.1893 40.8359 7.7 49.1 -174.0 0.2293 1.5 7.9 Cyg X-3 326.2812 38.2517 6.1 55.1 -157.7 0.5535 1.9 6.7 Cyg X-2 262.9017 -33.9103 4.7 37.9 24.9 0.2653 2.4 6.3 GX 354-0 250.1139 1.0862 2.4 40.0 85.4 1.3643 4.9 ------ UNKNOWN 263.0906 -44.7597 1.3 45.9 13.8 1.2594 8.7 ------ UNKNOWN 328.5106 -26.2762 2.4 42.6 -68.7 1.0845 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 117.068600 874.668600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.9500 -62.7526 7.0 45.3 39.2 4.0849 1.6 8.1 GX 301-2 244.9809 -15.6438 0.3 32.9 147.0 54.2306 40.4 0.2 Sco X-1 255.9914 -37.6948 11.0 8.9 140.9 0.9128 1.0 9.0 4U 1700-377 256.4650 -36.3659 2.2 9.8 147.2 4.4938 5.2 3.7 GX 349+2 263.0371 -24.7173 1.5 20.0 -179.7 5.9403 7.8 2.3 GX 1+4 264.7536 -44.4663 5.9 1.2 -102.6 1.4359 2.0 1.1 4U 1735-44 268.4927 -1.5929 9.9 43.4 -171.7 -1.7239 -1.2 11.3 SW J1753.5-0127 270.1871 -25.0876 3.4 20.5 -160.9 2.7118 3.4 5.3 GX 5-1 270.4773 -25.8823 0.0 19.8 -159.6 -1.1122 -1.4 12.6 GRS 1758-258 273.9806 -14.0349 1.7 32.1 -159.4 6.2184 6.9 1.5 GX 17+2 275.8187 -30.5112 5.3 17.4 -140.2 1.6432 2.2 10.3 H1820-303 285.1483 -24.7590 0.0 26.8 -130.4 2.2312 2.1 11.5 HT1900.1-2455 262.9158 -33.8694 4.6 10.9 179.6 2.1359 2.5 4.2 GX 354-0 224.7950 -75.3634 3.5 34.7 16.5 3.4659 3.3 ------ UNKNOWN 259.8956 -25.0232 0.5 19.9 171.9 17.6261 22.1 ------ UNKNOWN 48.4626 -78.3539 3.6 55.1 -7.5 8.9811 3.2 ------ UNKNOWN 11.0391 -76.0805 4.2 50.9 -16.7 4.7134 2.8 ------ UNKNOWN 301.4443 -13.2071 2.4 45.3 -121.4 16.5167 4.7 ------ UNKNOWN