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: Mon Dec 17 15:09:08 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger873433
======================================================================
Trigger: 00873433 Segment: 000
BAT Trigger Time: 564828901.888 [s; MET]
Trigger Stop: 564828902.912 [s; MET]
UTC: 2018-11-25T08:54:39.910800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 268.412921582668 Dec: -2.61324691311512 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.18
Image Trigger?: NO
Rate S/N Ratio: 12.2882057274445 [ if not an image trigger ]
Image S/N Ratio: 8.18
Analysis Position: [ source = BAT ]
RA: 268.412921582668 Dec: -2.61324691311512 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 268.392374393739 Dec: -2.63433922465096 [deg; J2000]
{ 17h 53m 34.2s , -02d 38' 03.6" }
+/- 2.2167643405626 [arcmin] (estimated 90% radius based on SNR)
+/- 0.934868610086708 [arcmin] (formal 1-sigma fit error)
SNR: 9.7551363025335
Angular difference between the analysis and refined position is 1.765864 arcmin
Partial Coding Fraction: 0.6953125 [ including projection effects ]
Duration
T90: 10.5119999647141 +/- 4.7872497517333
Measured from: 0.0720000267028809
to: 10.5839999914169 [s; relative to TRIGTIME]
T50: 3.19199991226196 +/- 2.03750835430094
Measured from: 0.740000009536743
to: 3.93199992179871 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.240000009536743
to: 1.24000000953674 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.180000066757202
to: 11.2400000095367 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.147171 0.203855 0.176195 0.018709
0.032491 0.032237 0.027307 0.023587 [error]
Peak 0.053621 0.077098 0.047314 0.018500
0.010325 0.010800 0.009226 0.007174 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 11.420 -0.180 11.240
T90 10.512 0.072 10.584
T50 3.192 0.740 3.932
Peak 1.000 0.240 1.240
====== 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: 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 -1.555 -0.309 0.298 - - - 3.07e-03 -5.52e-04 5.43e-04 99.510 57
CPL -0.847 -0.649 1.597 83.727 -30.090 -83.727 6.84e-03 -4.21e-03 3.01e-02 98.550 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 -1.749 -0.327 0.307 - - - 1.11e-02 -2.20e-03 2.12e-03 72.200 57
CPL -1.756 -0.322 0.316 9999.360 -9999.350 -9999.360 1.11e-02 -6.92e-03 3.76e-02 72.210 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 4.71e-08 8.37e-08 1.14e-07 3.20e-07 3.30e-07 5.65e-07 erg/cm2
90%_error_low -1.28e-08 -1.47e-08 -2.69e-08 -1.35e-07 -6.36e-08 -1.62e-07 erg/cm2
90%_error_hi 1.37e-08 1.46e-08 2.67e-08 1.87e-07 6.48e-08 2.04e-07 erg/cm2
Peak flux PL 5.81e-01 5.04e-01 3.00e-01 2.68e-01 1.50e+00 1.65e+00 ph/cm2/s
90%_error_low -1.48e-01 -8.52e-02 -7.74e-02 -1.16e-01 -2.53e-01 -2.82e-01 ph/cm2/s
90%_error_hi 1.57e-01 8.50e-02 7.72e-02 1.59e-01 2.53e-01 2.85e-01 ph/cm2/s
Fluence CPL 4.12e-08 8.92e-08 1.20e-07 1.32e-07 3.16e-07 3.83e-07 erg/cm2
90%_error_low -1.69e-08 -1.75e-08 -2.97e-08 -9.63e-08 -6.59e-08 -1.20e-07 erg/cm2
90%_error_hi 1.69e-08 1.83e-08 3.11e-08 3.07e-07 6.87e-08 2.54e-07 erg/cm2
Peak flux CPL 5.64e-01 3.86e-01 1.81e-01 1.42e-01 1.19e+00 1.25e+00 ph/cm2/s
90%_error_low -1.92e-01 -1.32e-01 -6.93e-02 N/A -4.09e-01 -4.29e-01 ph/cm2/s
90%_error_hi 2.00e-01 1.93e-01 8.45e-02 N/A 3.93e-01 4.34e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 268.3924 -2.6343 0.0197 23.9308 -63.1154 0.6314978 9.755 TRIG_00873433 Foreground time interval of the image: -0.180 11.240 (delta_t = 11.420 [sec]) Background time interval of the image: -38.787 -0.180 (delta_t = 38.607 [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 -0.180 sec. to 11.240 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.55508 ( -0.308539 0.298234 ) Norm@50keV : 3.06694E-03 ( -0.000551537 0.000543242 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 99.51 using 59 PHA bins. # Reduced chi-squared = 1.746 for 57 degrees of freedom # Null hypothesis probability = 4.225498e-04 Photon flux (15-150 keV) in 11.42 sec: 0.388841 ( -0.067075 0.067216 ) ph/cm2/s Energy fluence (15-150 keV) : 3.29531e-07 ( -6.36262e-08 6.47957e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.180 sec. to 11.240 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.846828 ( -0.649463 1.59685 ) Epeak [keV] : 83.7274 ( -30.1286 -83.7661 ) Norm@50keV : 6.83839E-03 ( -0.00421199 0.0300567 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 98.55 using 59 PHA bins. # Reduced chi-squared = 1.760 for 56 degrees of freedom # Null hypothesis probability = 3.883166e-04 Photon flux (15-150 keV) in 11.42 sec: 0.375825 ( -0.071857 0.071 ) ph/cm2/s Energy fluence (15-150 keV) : 3.1568e-07 ( -6.5912e-08 6.87051e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.240 sec. to 1.240 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.74948 ( -0.32737 0.306969 ) Norm@50keV : 1.11014E-02 ( -0.00220299 0.00212205 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 72.20 using 59 PHA bins. # Reduced chi-squared = 1.267 for 57 degrees of freedom # Null hypothesis probability = 8.452847e-02 Photon flux (15-150 keV) in 1 sec: 1.50088 ( -0.25269 0.25283 ) ph/cm2/s Energy fluence (15-150 keV) : 1.02457e-07 ( -2.05653e-08 2.11036e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.240 sec. to 1.240 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.75571 ( -0.324195 0.313538 ) Epeak [keV] : 9999.36 ( -9999.35 -9999.36 ) Norm@50keV : 1.10721E-02 ( -0.00694804 0.0376146 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 72.21 using 59 PHA bins. # Reduced chi-squared = 1.289 for 56 degrees of freedom # Null hypothesis probability = 7.131080e-02 Photon flux (15-150 keV) in 1 sec: 1.19217 ( -0.408755 0.39326 ) ph/cm2/s Energy fluence (15-150 keV) : 1.03055e-07 ( -2.41708e-08 1.62916e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
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 = 2.006762960250901E-01, IMY = 3.958181450901550E-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: -38.787400 -0.180000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4289 35.3454 5.5 57.3 -25.6 1.0240 2.1 1.4 Her X-1 255.9316 -37.9026 1.9 42.0 -127.2 1.2196 6.3 4.4 4U 1700-377 256.3226 -36.5329 10.9 41.0 -125.6 0.2036 1.1 8.5 GX 349+2 262.8443 -24.7170 4.4 30.6 -112.0 -0.3670 -2.6 9.1 GX 1+4 264.7399 -44.5191 5.2 41.2 -141.2 -0.3608 -2.2 4.1 4U 1735-44 268.3646 -1.5952 7.6 24.3 -60.8 -0.1672 -1.5 8.6 SW J1753.5-0127 270.4623 -25.2162 0.0 24.8 -120.0 0.1538 1.4 12.7 GX 5-1 270.1574 -25.8842 4.8 25.4 -121.0 0.2615 2.4 11.5 GRS 1758-258 273.9391 -13.8992 16.0 17.3 -94.0 0.0684 0.7 9.1 GX 17+2 276.0964 -30.5064 33.4 24.7 -137.5 0.0335 0.3 12.2 H1820-303 285.2214 -25.0494 0.0 15.9 -149.8 0.1549 1.7 12.7 HT1900.1-2455 288.8096 10.7953 6.7 21.2 3.3 0.1526 1.7 9.0 GRS 1915+105 299.6561 35.1490 2.5 46.1 19.5 0.9438 4.6 4.5 Cyg X-1 307.9789 40.9235 3.0 53.5 25.6 1.9219 3.8 6.2 Cyg X-3 263.1527 -33.7618 23.6 34.9 -126.9 -0.0685 -0.5 9.3 GX 354-0 301.2112 30.3873 2.5 41.7 22.9 0.7841 4.6 ------ UNKNOWN 287.9171 26.1494 2.8 36.5 4.9 0.4999 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.180000 11.240000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3725 35.2988 4.9 57.3 -25.7 -0.6709 -2.4 4.9 Her X-1 255.8417 -37.9468 3.6 42.1 -127.2 -0.3996 -3.2 9.2 4U 1700-377 256.2683 -36.5231 0.0 41.1 -125.6 -0.1885 -1.6 10.1 GX 349+2 262.8398 -24.6584 3.3 30.6 -111.9 0.2755 3.5 10.6 GX 1+4 264.8270 -44.4907 5.7 41.1 -141.2 0.1997 2.0 4.4 4U 1735-44 268.2144 -1.3374 5.3 24.6 -60.3 0.1441 2.2 11.5 SW J1753.5-0127 270.1063 -24.9423 0.0 24.9 -119.1 -0.0521 -0.8 12.7 GX 5-1 270.1390 -25.7415 6.0 25.3 -120.7 0.1257 1.9 8.8 GRS 1758-258 274.1429 -13.8781 0.0 17.1 -94.1 -0.1378 -2.4 12.4 GX 17+2 276.0885 -30.3437 8.0 24.6 -137.2 0.0863 1.4 8.6 H1820-303 284.8722 -24.9148 28.4 15.9 -148.5 -0.0210 -0.4 8.9 HT1900.1-2455 288.7331 11.0853 4.5 21.5 3.2 0.1460 2.6 9.2 GRS 1915+105 299.7752 35.0640 89.4 46.0 19.6 -0.0158 -0.1 12.3 Cyg X-1 307.9968 40.8822 6.1 53.4 25.6 -0.5326 -1.9 6.7 Cyg X-3 262.9765 -33.8177 157.3 35.0 -126.8 -0.0065 -0.1 1.2 GX 354-0 268.3924 -2.6343 1.2 23.9 -63.1 0.6315 9.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 730.212600 962.257700 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 326.2289 38.2992 4.5 34.3 -98.5 1.3979 2.6 3.0 Cyg X-2 53.8099 23.1907 2.6 39.9 86.5 4.5985 4.3 ------ UNKNOWN 38.0588 9.3118 2.7 40.2 118.6 4.7415 4.4 ------ UNKNOWN 55.5812 43.3180 2.6 32.2 54.4 2.0684 4.5 ------ UNKNOWN 354.0741 45.1612 2.9 12.9 -87.3 1.1372 4.0 ------ UNKNOWN 337.4253 35.1994 3.2 27.1 -110.9 1.3991 3.6 ------ UNKNOWN 310.4949 49.6631 2.7 41.9 -75.6 5.2614 4.2 ------ UNKNOWN