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 14:50:10 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger741965
======================================================================
Trigger: 00741965 Segment: 000
BAT Trigger Time: 510912541.696 [s; MET]
Trigger Stop: 510912545.792 [s; MET]
UTC: 2017-03-11T08:08:42.959380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 280.563140731264 Dec: -30.0629025629876 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.33
Image Trigger?: NO
Rate S/N Ratio: 10.6770782520313 [ if not an image trigger ]
Image S/N Ratio: 7.33
Analysis Position: [ source = BAT ]
RA: 280.563140731264 Dec: -30.0629025629876 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 280.54104496463 Dec: -30.0380810995338 [deg; J2000]
{ 18h 42m 09.9s , -30d 02' 17.1" }
+/- 1.99126309102757 [arcmin] (estimated 90% radius based on SNR)
+/- 0.935597673806017 [arcmin] (formal 1-sigma fit error)
SNR: 11.3708189797564
Angular difference between the analysis and refined position is 1.880116 arcmin
Partial Coding Fraction: 0.6484375 [ including projection effects ]
Duration
T90: 9 +/- 2.82842712474619
Measured from: -3.69599997997284
to: 5.30400002002716 [s; relative to TRIGTIME]
T50: 3 +/- 2.82842712474619
Measured from: -0.695999979972839
to: 2.30400002002716 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.30400002002716
to: 2.30400002002716 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.69599997997284
to: 6.30400002002716 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.126156 0.153136 0.117645 0.050374
0.025619 0.025839 0.022495 0.018260 [error]
Peak 0.008891 0.023565 0.027577 0.019661
0.008452 0.008219 0.007735 0.005829 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 10.000 -3.696 6.304
T90 9.000 -3.696 5.304
T50 3.000 -0.696 2.304
Peak 1.000 1.304 2.304
====== 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 -1.301 -0.330 0.341 - - - 3.09e-03 -5.06e-04 5.06e-04 59.210 57
CPL -1.328 -1.764 -0.501 9999.360 N/A N/A 3.07e-03 N/A N/A 59.270 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 -1.071 -0.612 0.671 - - - 4.99e-03 -1.69e-03 1.65e-03 60.240 57
CPL -0.826 0.826 4.443 274.383 -274.383 -274.383 6.41e-03 -3.04e-03 2.91e-01 60.290 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 3.27e-08 6.80e-08 1.10e-07 4.03e-07 3.05e-07 6.14e-07 erg/cm2
90%_error_low -1.06e-08 -1.33e-08 -2.35e-08 -1.68e-07 -5.64e-08 -1.85e-07 erg/cm2
90%_error_hi 1.16e-08 1.27e-08 2.27e-08 2.44e-07 5.69e-08 2.50e-07 erg/cm2
Peak flux PL 1.36e-01 1.77e-01 1.69e-01 2.84e-01 5.77e-01 7.67e-01 ph/cm2/s
90%_error_low -8.33e-02 -7.75e-02 -6.16e-02 -1.75e-01 -1.98e-01 -2.59e-01 ph/cm2/s
90%_error_hi 1.09e-01 7.37e-02 5.93e-02 3.05e-01 2.00e-01 2.82e-01 ph/cm2/s
Fluence CPL 3.28e-08 6.79e-08 1.05e-07 3.99e-07 3.02e-07 6.01e-07 erg/cm2
90%_error_low -1.07e-08 -1.39e-08 N/A N/A N/A -2.04e-07 erg/cm2
90%_error_hi 1.16e-08 1.34e-08 N/A N/A N/A 2.59e-07 erg/cm2
Peak flux CPL 1.39e-01 1.77e-01 1.67e-01 2.83e-01 5.79e-01 7.91e-01 ph/cm2/s
90%_error_low -9.82e-02 N/A -6.08e-02 N/A -2.14e-01 -4.26e-01 ph/cm2/s
90%_error_hi 1.09e-01 N/A 8.43e-02 N/A 2.00e-01 2.37e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 280.5410 -30.0381 0.0169 26.8576 42.3843 0.5203280 11.371 TRIG_00741965 Foreground time interval of the image: -3.696 6.304 (delta_t = 10.000 [sec]) Background time interval of the image: -364.195 -346.257 (delta_t = 17.938 [sec]) -239.696 -3.696 (delta_t = 236.000 [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 -3.696 sec. to 6.304 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.30051 ( -0.329556 0.34072 ) Norm@50keV : 3.08880E-03 ( -0.000506426 0.00050624 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.21 using 59 PHA bins. # Reduced chi-squared = 1.039 for 57 degrees of freedom # Null hypothesis probability = 3.948529e-01 Photon flux (15-150 keV) in 10 sec: 0.368538 ( -0.063277 0.063514 ) ph/cm2/s Energy fluence (15-150 keV) : 3.05232e-07 ( -5.63921e-08 5.69359e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.696 sec. to 6.304 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.88115 ( -0.209231 1.05416 ) Epeak [keV] : 260.144 ( ) Norm@50keV : 4.97642E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.98 using 59 PHA bins. # Reduced chi-squared = 0.9997 for 56 degrees of freedom # Null hypothesis probability = 4.755420e-01 Photon flux (15-150 keV) in 10 sec: 0.368571 ( -0.063456 0.063399 ) ph/cm2/s Energy fluence (15-150 keV) : 3.02093e-07 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.304 sec. to 2.304 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.07143 ( -0.612438 0.671486 ) Norm@50keV : 4.98828E-03 ( -0.00168986 0.00164984 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.24 using 59 PHA bins. # Reduced chi-squared = 1.057 for 57 degrees of freedom # Null hypothesis probability = 3.592473e-01 Photon flux (15-150 keV) in 1 sec: 0.577111 ( -0.197823 0.200399 ) ph/cm2/s Energy fluence (15-150 keV) : 5.26441e-08 ( -1.8406e-08 1.86839e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.304 sec. to 2.304 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.06606 ( 0.848889 4.46588 ) Epeak [keV] : 9995.80 ( -9996.83 -9996.83 ) Norm@50keV : 5.01600E-03 ( -0.00164689 0.292122 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.24 using 59 PHA bins. # Reduced chi-squared = 1.076 for 56 degrees of freedom # Null hypothesis probability = 3.248966e-01 Photon flux (15-150 keV) in 1 sec: 0.579311 ( -0.213809 0.200403 ) ph/cm2/s Energy fluence (15-150 keV) : 5.28141e-08 ( -2.04137e-08 1.68437e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 9.0 sec. Hardness ratio (energy fluence ratio) = 1.62401526427
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.006783e-07 S(50-150 keV) = 2.0455073e-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 = 3.740470756710060E-01, IMY = -3.413637314041561E-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: -364.195410 -346.257400 -239.696000 -3.696000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 263.0164 -24.8014 3.2 38.6 64.0 2.5032 3.6 3.4 GX 1+4 264.7339 -44.4432 9.1 45.6 36.4 0.9076 1.3 0.6 4U 1735-44 268.3707 -1.4803 812.1 34.0 104.3 0.0082 0.0 1.7 SW J1753.5-0127 270.3493 -25.0388 6.5 32.3 60.3 0.8116 1.8 4.3 GX 5-1 270.3380 -25.6139 34.1 32.5 59.3 0.1539 0.3 8.0 GRS 1758-258 274.0174 -14.0123 4.4 26.6 81.0 0.9760 2.6 1.6 GX 17+2 275.8760 -30.4775 3.7 30.3 46.7 1.1077 3.2 7.1 H1820-303 285.1866 -25.0834 0.0 20.5 45.3 0.2022 0.8 12.8 HT1900.1-2455 288.8225 10.9470 1.4 25.3 150.6 2.3318 8.1 1.4 GRS 1915+105 299.5811 35.1945 0.8 46.4 178.2 8.4028 14.5 0.6 Cyg X-1 307.9857 41.0008 19.2 52.6 -173.5 -0.4814 -0.6 6.3 Cyg X-3 326.1559 38.2015 8.7 54.7 -156.0 1.7243 1.3 7.2 Cyg X-2 263.0459 -33.8099 7.3 41.5 50.7 1.1674 1.6 3.2 GX 354-0 267.2983 22.0302 2.4 47.0 135.0 5.6801 4.8 ------ UNKNOWN 258.4530 -43.0451 2.3 48.7 41.2 5.3510 5.2 ------ UNKNOWN 328.4911 -57.6657 2.7 50.9 -18.5 2.5327 4.3 ------ UNKNOWN 347.5778 -41.6092 4.2 50.6 -44.5 4.4726 2.7 ------ UNKNOWN 339.7445 13.0362 3.0 45.3 -121.3 4.8149 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -3.696000 6.304000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 262.9346 -24.6212 7.3 38.6 64.3 0.1808 1.6 8.5 GX 1+4 264.8100 -44.6278 7.2 45.7 36.1 0.1849 1.6 11.0 4U 1735-44 268.4187 -1.4637 10.6 33.9 104.3 0.0809 1.1 3.1 SW J1753.5-0127 270.1240 -25.0764 12.8 32.5 60.4 -0.0607 -0.9 8.7 GX 5-1 270.1489 -25.6802 52.4 32.6 59.3 -0.0146 -0.2 9.1 GRS 1758-258 274.1567 -14.0801 10.9 26.5 80.9 0.0598 1.1 9.2 GX 17+2 275.9045 -30.3656 279.3 30.3 46.9 0.0022 0.0 1.1 H1820-303 284.9934 -24.9033 5.3 20.5 46.0 -0.0880 -2.2 2.5 HT1900.1-2455 288.9029 11.0966 6.0 25.4 151.0 -0.0842 -1.9 11.0 GRS 1915+105 299.7183 35.3532 0.0 46.6 178.4 -0.1079 -1.3 11.0 Cyg X-1 308.0895 40.9183 4.7 52.5 -173.4 0.2830 2.4 2.3 Cyg X-3 326.1141 38.1874 6.1 54.6 -156.0 -0.3100 -1.9 8.5 Cyg X-2 262.8543 -33.6452 0.0 41.5 51.1 0.2203 2.0 13.2 GX 354-0 270.4292 24.7343 2.1 46.8 140.4 0.8264 5.5 ------ UNKNOWN 280.5410 -30.0381 1.0 26.9 42.4 0.5205 11.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 88.804590 962.370500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9801 -15.6468 0.8 35.7 112.5 27.1832 14.0 0.4 Sco X-1 255.9905 -37.8508 0.6 21.8 69.2 20.9187 20.8 0.4 4U 1700-377 256.4200 -36.3684 3.4 21.1 73.0 3.5300 3.4 3.4 GX 349+2 262.9739 -24.7008 1.8 16.5 111.4 5.0868 6.4 3.3 GX 1+4 264.6708 -44.5924 6.3 19.2 43.2 1.6075 1.8 9.1 4U 1735-44 268.2372 -1.4674 7.9 30.9 162.1 1.6545 1.5 7.9 SW J1753.5-0127 270.3000 -25.0088 4.4 10.4 123.3 2.2835 2.6 4.3 GX 5-1 270.3102 -25.7512 5.8 10.1 119.7 1.7691 2.0 0.6 GRS 1758-258 274.0692 -13.9096 3.1 17.2 164.9 3.0272 3.7 8.5 GX 17+2 275.7484 -30.3408 5.6 4.2 91.8 1.6030 2.1 9.3 H1820-303 285.2148 -24.9883 9.5 6.5 -133.4 -1.0025 -1.2 10.5 HT1900.1-2455 288.8270 10.9437 2.3 41.8 -161.1 8.0206 5.1 1.7 GRS 1915+105 262.9772 -33.8470 5.4 15.4 78.0 1.8458 2.2 0.9 GX 354-0 222.3124 -59.7431 3.3 48.5 41.6 11.6865 3.5 ------ UNKNOWN 259.8942 -25.0215 0.4 19.0 107.1 20.7942 26.1 ------ UNKNOWN 287.7513 -58.8460 3.1 29.2 -0.9 3.4804 3.8 ------ UNKNOWN 298.9399 -21.2176 3.5 18.7 -107.2 3.4346 3.4 ------ UNKNOWN 294.0525 23.2156 3.1 54.8 -158.1 15.4903 3.7 ------ UNKNOWN 343.7081 -47.3913 4.9 50.7 -44.6 17.0941 2.3 ------ UNKNOWN 314.6843 1.5319 2.3 45.3 -121.3 26.6629 5.1 ------ UNKNOWN