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: Fri Oct 19 18:07:14 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger863421
======================================================================
Trigger: 00863421 Segment: 000
BAT Trigger Time: 559579073.6 [s; MET]
Trigger Stop: 559579075.648 [s; MET]
UTC: 2018-09-25T14:37:31.949140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 315.213023298324 Dec: -64.4434926568184 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.58
Image Trigger?: NO
Rate S/N Ratio: 27.3313007374329 [ if not an image trigger ]
Image S/N Ratio: 7.58
Analysis Position: [ source = BAT ]
RA: 315.213023298324 Dec: -64.4434926568184 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 315.21379966156 Dec: -64.4503064733077 [deg; J2000]
{ 21h 00m 51.3s , -64d 27' 01.1" }
+/- 1.48622269399091 [arcmin] (estimated 90% radius based on SNR)
+/- 0.622509591963437 [arcmin] (formal 1-sigma fit error)
SNR: 17.2696785364178
Angular difference between the analysis and refined position is 0.409322 arcmin
Partial Coding Fraction: 0.1542969 [ including projection effects ]
Duration
T90: 82.6319999694824 +/- 23.6413051877051
Measured from: -3.48000001907349
to: 79.1519999504089 [s; relative to TRIGTIME]
T50: 42.2359999418259 +/- 11.030345423084
Measured from: 2.32400000095367
to: 44.5599999427795 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.868000030517578
to: 1.86800003051758 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.44000005722046
to: 104.027999997139 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.555607 2.003905 1.707529 0.758791
0.132909 0.140322 0.123865 0.105299 [error]
Peak 0.076744 0.122788 0.118763 0.090084
0.019044 0.022179 0.020424 0.019106 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 108.468 -4.440 104.028
T90 82.632 -3.480 79.152
T50 42.236 2.324 44.560
Peak 1.000 0.868 1.868
====== 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 -1.478 -0.128 0.128 - - - 3.89e-03 -2.75e-04 2.75e-04 59.520 57
CPL -1.446 -0.160 0.342 975.328 -975.328 -975.328 4.02e-03 -3.97e-04 1.53e-04 59.660 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 -1.290 -0.312 0.315 - - - 2.58e-02 -4.63e-03 4.62e-03 61.340 57
CPL -0.981 -3.772 0.968 191.627 N/A N/A 3.54e-02 N/A N/A 61.180 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 5.28e-07 9.83e-07 1.41e-06 4.29e-06 4.02e-06 7.22e-06 erg/cm2
90%_error_low -6.91e-08 -7.78e-08 -1.25e-07 -7.90e-07 -3.04e-07 -8.79e-07 erg/cm2
90%_error_hi 7.21e-08 7.72e-08 1.24e-07 9.03e-07 3.05e-07 9.67e-07 erg/cm2
Peak flux PL 8.68e-01 9.90e-01 8.09e-01 1.11e+00 3.07e+00 3.77e+00 ph/cm2/s
90%_error_low -2.87e-01 -2.16e-01 -1.66e-01 -4.14e-01 -5.83e-01 -6.85e-01 ph/cm2/s
90%_error_hi 3.22e-01 2.11e-01 1.62e-01 5.35e-01 5.86e-01 6.89e-01 ph/cm2/s
Fluence CPL 5.32e-07 9.79e-07 1.40e-06 4.47e-06 4.03e-06 7.03e-06 erg/cm2
90%_error_low -8.52e-08 -8.29e-08 N/A -1.87e-06 -3.51e-07 -1.56e-06 erg/cm2
90%_error_hi 7.47e-08 9.05e-08 N/A 2.73e-07 2.46e-07 1.11e-06 erg/cm2
Peak flux CPL 8.00e-01 1.01e+00 8.43e-01 8.39e-01 3.03e+00 3.49e+00 ph/cm2/s
90%_error_low -3.87e-01 -2.27e-01 -1.93e-01 -8.39e-01 -6.13e-01 -9.22e-01 ph/cm2/s
90%_error_hi 3.77e-01 2.36e-01 2.23e-01 3.86e-01 5.90e-01 9.18e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 315.2138 -64.4503 0.0111 49.0892 -146.9342 4.3509338 17.270 TRIG_00863421 Foreground time interval of the image: -4.440 31.701 (delta_t = 36.141 [sec]) Background time interval of the image: -239.600 -4.440 (delta_t = 235.160 [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 -4.440 sec. to 104.028 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.47772 ( -0.128459 0.128392 ) Norm@50keV : 3.89021E-03 ( -0.000274797 0.000274502 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.52 using 59 PHA bins. # Reduced chi-squared = 1.044 for 57 degrees of freedom # Null hypothesis probability = 3.839234e-01 Photon flux (15-150 keV) in 108.5 sec: 0.482810 ( -0.036352 0.036518 ) ph/cm2/s Energy fluence (15-150 keV) : 4.01966e-06 ( -3.03545e-07 3.04873e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.440 sec. to 104.028 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.47496 ( -0.159966 0.341859 ) Epeak [keV] : 1.00000E+04 ( -10000 -10000 ) Norm@50keV : 3.90240E-03 ( -0.000275644 0.000274438 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.53 using 59 PHA bins. # Reduced chi-squared = 1.063 for 56 degrees of freedom # Null hypothesis probability = 3.482934e-01 Photon flux (15-150 keV) in 108.5 sec: 0.484331 ( -0.042399 0.039166 ) ph/cm2/s Energy fluence (15-150 keV) : 4.02995e-06 ( -3.51035e-07 2.45675e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.868 sec. to 1.868 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.29041 ( -0.311885 0.315024 ) Norm@50keV : 2.57761E-02 ( -0.00463479 0.00462483 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.34 using 59 PHA bins. # Reduced chi-squared = 1.076 for 57 degrees of freedom # Null hypothesis probability = 3.232498e-01 Photon flux (15-150 keV) in 1 sec: 3.06982 ( -0.5831 0.58648 ) ph/cm2/s Energy fluence (15-150 keV) : 2.55347e-07 ( -4.87091e-08 4.88886e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.868 sec. to 1.868 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.21171 ( -2.54175 2.19808 ) Epeak [keV] : 75.7184 ( ) Norm@50keV : 5.20177E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.53 using 59 PHA bins. # Reduced chi-squared = 1.063 for 56 degrees of freedom # Null hypothesis probability = 3.483754e-01 Photon flux (15-150 keV) in 1 sec: 3.02912 ( -0.61311 0.58964 ) ph/cm2/s Energy fluence (15-150 keV) : 2.5321e-07 ( -5.04557e-08 4.97603e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 82.632 sec. Hardness ratio (energy fluence ratio) = 1.4362488751
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.5110078e-06 S(50-150 keV) = 2.508641e-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 = -9.670959701961642E-01, IMY = 6.296188426576044E-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: -239.600000 -4.440000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 285.0959 -24.8955 4.2 36.0 -82.0 1.3373 2.7 3.6 HT1900.1-2455 288.8139 10.9856 2.1 42.5 -24.2 2.0172 5.6 2.6 GRS 1915+105 299.6059 35.2398 2.1 55.2 6.5 5.5960 5.6 2.4 Cyg X-1 329.7447 27.3098 2.7 43.5 38.7 2.5387 4.3 ------ UNKNOWN 333.7459 2.7916 2.8 21.6 61.7 1.0320 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -4.440000 31.700600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 284.8457 -24.8473 0.0 36.2 -81.9 0.2853 1.7 11.3 HT1900.1-2455 288.7198 10.8496 10.5 42.5 -24.5 -0.1350 -1.1 7.4 GRS 1915+105 299.6316 35.2732 4.5 55.2 6.6 -0.7583 -2.6 4.7 Cyg X-1 347.2364 -38.2504 2.0 31.6 169.7 0.5568 5.8 ------ UNKNOWN 315.2138 -64.4503 0.7 49.1 -146.9 4.3501 17.3 ------ UNKNOWN 274.1143 7.8584 2.1 53.1 -38.2 2.2660 5.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 97.700600 962.534600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 256.0237 -37.8989 2.1 43.2 -41.1 6.2363 5.4 3.7 4U 1700-377 256.5006 -36.5562 4.7 44.2 -39.6 3.0030 2.5 8.6 GX 349+2 262.8667 -24.8466 10.1 51.8 -25.5 -1.8635 -1.1 9.8 GX 1+4 264.5793 -44.3669 3.1 34.3 -38.5 3.0257 3.8 8.6 4U 1735-44 270.2303 -25.1889 6.2 48.7 -17.8 2.5273 1.9 7.2 GX 5-1 270.3097 -25.7211 3.1 48.2 -18.1 4.9982 3.7 1.4 GRS 1758-258 274.0081 -13.8946 12.9 57.9 -8.5 -3.3970 -1.0 8.5 GX 17+2 275.8829 -30.3749 5.7 41.9 -14.4 1.8812 2.0 2.2 H1820-303 284.9159 -24.9332 41.8 44.1 -0.6 0.3129 0.3 6.6 HT1900.1-2455 262.8207 -33.9496 7.0 43.8 -31.3 1.7221 1.7 10.9 GX 354-0 357.0779 -39.1023 3.2 35.1 104.9 5.5167 3.7 ------ UNKNOWN 45.0738 -41.7942 2.2 53.0 151.5 18.3633 5.3 ------ UNKNOWN 40.2615 -47.7686 3.4 46.1 152.3 5.6618 3.4 ------ UNKNOWN 41.1528 -47.8875 2.6 46.4 153.1 7.5408 4.5 ------ UNKNOWN 302.6492 -21.3112 3.4 43.9 23.6 4.2601 3.4 ------ UNKNOWN 32.7048 -59.1272 3.1 34.7 158.9 3.9027 3.8 ------ UNKNOWN 293.4441 -28.4854 2.6 38.5 9.0 4.0592 4.5 ------ UNKNOWN 278.3059 -11.7785 3.6 58.5 -3.0 12.5734 3.2 ------ UNKNOWN 84.6940 -51.9657 3.6 57.2 -173.9 12.4084 3.2 ------ UNKNOWN 271.9919 -37.6821 2.6 36.8 -24.1 3.7305 4.3 ------ UNKNOWN 248.3362 -67.3861 2.4 26.1 -86.0 3.5455 4.8 ------ UNKNOWN