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: Thu Apr 5 17:28:01 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger814677
======================================================================
Trigger: 00814677 Segment: 000
BAT Trigger Time: 542869065.728 [s; MET]
Trigger Stop: 542869067.776 [s; MET]
UTC: 2018-03-16T04:57:25.096800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 265.436483229163 Dec: 0.736518945680564 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.43
Image Trigger?: NO
Rate S/N Ratio: 21.51743479135 [ if not an image trigger ]
Image S/N Ratio: 9.43
Analysis Position: [ source = BAT ]
RA: 265.436483229163 Dec: 0.736518945680564 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 265.42170456138 Dec: 0.737511045022157 [deg; J2000]
{ 17h 41m 41.2s , +00d 44' 15.0" }
+/- 1.4542762881274 [arcmin] (estimated 90% radius based on SNR)
+/- 0.612359989159808 [arcmin] (formal 1-sigma fit error)
SNR: 17.8141716545047
Angular difference between the analysis and refined position is 0.888643 arcmin
Partial Coding Fraction: 0.2929688 [ including projection effects ]
Duration
T90: 87 +/- 20.591260281974
Measured from: -61.7280000448227
to: 25.2719999551773 [s; relative to TRIGTIME]
T50: 16 +/- 4.24264068711928
Measured from: -7.72800004482269
to: 8.27199995517731 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.27199995517731
to: 2.27199995517731 [s; relative to TRIGTIME]
Total Fluence
Measured from: -79.7280000448227
to: 37.2719999551773 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.703096 2.865625 1.968505 0.722571
0.176496 0.175125 0.149392 0.118919 [error]
Peak 0.061511 0.175653 0.114437 0.069534
0.017343 0.018956 0.016529 0.013314 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 117.000 -79.728 37.272
T90 87.000 -61.728 25.272
T50 16.000 -7.728 8.272
Peak 1.000 1.272 2.272
====== 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 -1.458 -0.121 0.122 - - - 4.40e-03 -3.04e-04 3.04e-04 58.740 57
CPL -1.390 -0.182 0.413 466.561 -466.561 -466.561 4.75e-03 -6.44e-04 2.67e-03 58.790 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 -1.205 -0.226 0.236 - - - 2.83e-02 -3.75e-03 3.74e-03 70.240 57
CPL -1.205 -0.223 0.295 9999.360 -9999.360 -9999.360 2.84e-02 -2.84e-02 -1.83e-02 70.240 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 6.31e-07 1.19e-06 1.73e-06 5.38e-06 4.92e-06 8.94e-06 erg/cm2
90%_error_low -8.01e-08 -9.25e-08 -1.47e-07 -9.40e-07 -3.62e-07 -1.05e-06 erg/cm2
90%_error_hi 8.32e-08 9.17e-08 1.46e-07 1.07e-06 3.63e-07 1.15e-06 erg/cm2
Peak flux PL 8.79e-01 1.05e+00 9.14e-01 1.36e+00 3.32e+00 4.20e+00 ph/cm2/s
90%_error_low -2.26e-01 -1.75e-01 -1.33e-01 -3.78e-01 -4.65e-01 -5.63e-01 ph/cm2/s
90%_error_hi 2.45e-01 1.71e-01 1.32e-01 4.65e-01 4.68e-01 5.69e-01 ph/cm2/s
Fluence CPL 6.30e-07 1.19e-06 1.74e-06 5.36e-06 4.91e-06 8.77e-06 erg/cm2
90%_error_low -9.49e-08 -9.47e-08 -1.49e-07 -2.62e-06 -3.88e-07 -2.47e-06 erg/cm2
90%_error_hi 4.69e-08 1.07e-07 1.62e-07 6.13e-07 3.66e-07 1.25e-06 erg/cm2
Peak flux CPL 8.96e-01 1.05e+00 9.10e-01 1.36e+00 3.33e+00 4.25e+00 ph/cm2/s
90%_error_low -2.46e-01 -1.40e-01 -1.31e-01 -6.02e-01 -4.79e-01 -9.59e-01 ph/cm2/s
90%_error_hi 2.28e-01 1.89e-01 1.55e-01 4.54e-01 4.71e-01 4.92e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 265.4217 0.7375 0.0108 38.8899 42.7936 8.1516094 17.814 TRIG_00814677 Foreground time interval of the image: -79.728 24.373 (delta_t = 104.101 [sec]) Background time interval of the image: -166.827 -79.728 (delta_t = 87.099 [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 -79.728 sec. to 37.272 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.45777 ( -0.12149 0.122295 ) Norm@50keV : 4.39700E-03 ( -0.00030383 0.000303667 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.74 using 59 PHA bins. # Reduced chi-squared = 1.031 for 57 degrees of freedom # Null hypothesis probability = 4.115180e-01 Photon flux (15-150 keV) in 117 sec: 0.542933 ( -0.039992 0.040104 ) ph/cm2/s Energy fluence (15-150 keV) : 4.91649e-06 ( -3.61728e-07 3.63289e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -79.728 sec. to 37.272 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.45444 ( -0.176962 0.417854 ) Epeak [keV] : 8969.30 ( -8894.61 -8894.61 ) Norm@50keV : 4.41381E-03 ( -0.000306443 0.00301079 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.74 using 59 PHA bins. # Reduced chi-squared = 1.049 for 56 degrees of freedom # Null hypothesis probability = 3.754294e-01 Photon flux (15-150 keV) in 117 sec: 0.542598 ( -0.041354 0.040517 ) ph/cm2/s Energy fluence (15-150 keV) : 4.9122e-06 ( -3.87539e-07 3.66245e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.272 sec. to 2.272 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.20511 ( -0.226142 0.235644 ) Norm@50keV : 2.83008E-02 ( -0.0037532 0.00374399 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 70.24 using 59 PHA bins. # Reduced chi-squared = 1.232 for 57 degrees of freedom # Null hypothesis probability = 1.119084e-01 Photon flux (15-150 keV) in 1 sec: 3.32436 ( -0.46548 0.46817 ) ph/cm2/s Energy fluence (15-150 keV) : 2.86741e-07 ( -3.99382e-08 4.01026e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.272 sec. to 2.272 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.41284 ( -0.224518 0.294203 ) Epeak [keV] : 135.511 ( -9999.36 -9999.36 ) Norm@50keV : 4.08136E-03 ( -0.00407692 0.0060101 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 69.63 using 59 PHA bins. # Reduced chi-squared = 1.243 for 56 degrees of freedom # Null hypothesis probability = 1.042650e-01 Photon flux (15-150 keV) in 1 sec: 3.32871 ( -0.47892 0.47127 ) ph/cm2/s Energy fluence (15-150 keV) : 2.87184e-07 ( -4.05971e-08 3.51751e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 87.0 sec. Hardness ratio (energy fluence ratio) = 1.45626471982
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.8219738e-06 S(50-150 keV) = 3.094561e-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 = 5.918939788582531E-01, IMY = -5.479761629433119E-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: -166.827400 -79.728000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4075 35.2161 17.9 39.2 101.5 -0.4302 -0.6 8.0 Her X-1 268.3728 -1.4557 85.3 38.1 37.0 -0.0396 -0.1 0.3 SW J1753.5-0127 270.3493 -25.1386 75.3 55.6 14.6 -0.1423 -0.2 5.0 GX 5-1 273.9285 -14.1655 7.7 44.4 18.3 -0.4732 -1.5 9.0 GX 17+2 285.1234 -24.9916 4.9 50.2 -0.8 -0.9281 -2.4 6.4 HT1900.1-2455 288.7729 10.9644 1.5 15.3 20.0 1.2957 7.8 1.9 GRS 1915+105 299.5693 35.1914 0.6 11.7 171.0 3.3138 20.9 1.2 Cyg X-1 308.0590 40.9110 2.2 19.3 -172.0 0.8860 5.3 3.4 Cyg X-3 326.1684 38.1818 7.6 28.1 -143.7 0.2899 1.5 8.4 Cyg X-2 258.1880 67.3566 2.6 50.1 145.4 3.6848 4.4 ------ UNKNOWN 275.0951 7.1891 0.5 27.3 40.8 5.4665 25.4 ------ UNKNOWN 359.5707 55.4390 2.9 54.8 -158.2 2.9791 4.0 ------ UNKNOWN 2.5623 54.8266 5.1 56.4 -157.2 2.4276 2.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -79.728000 24.372590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.2830 35.2682 8.1 39.4 101.5 1.2795 1.4 9.6 Her X-1 268.2575 -1.4906 5.7 38.2 37.1 -0.8383 -2.0 7.0 SW J1753.5-0127 270.3567 -25.2519 8.8 55.7 14.5 1.8379 1.3 11.1 GX 5-1 273.9597 -14.1183 12.7 44.4 18.3 0.4229 0.9 5.6 GX 17+2 285.0718 -24.9208 264.8 50.1 -0.7 0.0228 0.0 1.9 HT1900.1-2455 288.9745 11.0536 4.9 15.1 19.6 -0.5060 -2.3 12.2 GRS 1915+105 299.5385 35.3706 10.9 11.8 170.8 0.2368 1.0 10.5 Cyg X-1 307.9647 40.8791 3.1 19.2 -172.1 -0.7860 -3.7 7.9 Cyg X-3 326.0627 38.4584 6.9 28.2 -144.3 -0.4325 -1.7 9.7 Cyg X-2 265.4217 0.7375 0.6 38.9 42.8 8.1528 17.8 ------ UNKNOWN 275.0371 7.1583 2.3 27.4 40.9 1.3992 5.0 ------ UNKNOWN 336.0311 52.4187 2.0 40.8 -160.7 2.0002 5.7 ------ UNKNOWN 351.0853 34.9959 2.7 47.2 -132.5 3.5651 4.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 81.772600 962.348600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9837 -15.6353 0.3 26.0 48.6 62.1457 39.6 0.4 Sco X-1 254.3043 35.3060 8.8 36.1 162.9 -2.4989 -1.3 7.8 Her X-1 255.9872 -37.8514 1.8 39.6 10.2 10.4967 6.6 0.4 4U 1700-377 256.5772 -36.5821 6.7 38.2 10.0 2.7886 1.7 11.7 GX 349+2 262.8649 -24.5968 76.7 25.5 3.9 -0.1807 -0.2 11.9 GX 1+4 264.6026 -44.3081 17.7 45.0 -0.7 1.4931 0.7 10.4 4U 1735-44 268.3376 -1.5064 9.4 3.6 -53.7 1.4136 1.2 3.7 SW J1753.5-0127 270.4324 -24.9283 493.9 26.1 -11.9 -0.0282 -0.0 12.1 GX 5-1 270.2270 -25.8150 3.6 26.9 -11.1 3.8489 3.2 5.9 GRS 1758-258 273.8681 -13.9305 9.8 16.9 -30.9 1.3725 1.2 10.2 GX 17+2 275.7772 -30.3253 6.2 32.6 -18.3 2.4618 1.9 8.0 H1820-303 284.9300 -25.0757 7.0 32.0 -36.4 2.3954 1.7 11.0 HT1900.1-2455 288.7880 10.9236 1.3 25.3 -116.2 13.7434 8.6 1.4 GRS 1915+105 299.5731 35.2065 1.0 46.9 -142.7 38.5955 11.1 0.9 Cyg X-1 262.8847 -33.7696 7.8 34.6 2.2 2.0472 1.5 6.5 GX 354-0 276.4576 52.9643 2.3 53.0 -173.3 17.8952 5.0 ------ UNKNOWN 275.0876 7.1899 0.2 11.6 -125.8 57.5087 48.9 ------ UNKNOWN 275.3741 -14.5339 2.6 18.1 -33.9 5.1298 4.5 ------ UNKNOWN 288.7247 -7.3181 3.1 24.6 -72.1 6.0177 3.7 ------ UNKNOWN 305.0594 31.7070 3.3 48.5 -135.2 16.1020 3.5 ------ UNKNOWN 306.4324 5.1381 4.3 41.1 -98.6 14.7247 2.7 ------ UNKNOWN UNKNOWN