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 v2.47
Process Start Time: Mon May 18 14:53:22 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger952791
======================================================================
Trigger: 00952791 Segment: 000
BAT Trigger Time: 601829096 [s; MET]
Trigger Stop: 601829160 [s; MET]
UTC: 2020-01-27T14:44:31.666360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 295.204508762955 Dec: 44.9096354629614 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.94
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 12.94
Analysis Position: [ source = BAT ]
RA: 295.204508762955 Dec: 44.9096354629614 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 295.20695028219 Dec: 44.9326548034124 [deg; J2000]
{ 19h 40m 49.7s , +44d 55' 57.6" }
+/- 2.42959923170196 [arcmin] (estimated 90% radius based on SNR)
+/- 1.05821666267262 [arcmin] (formal 1-sigma fit error)
SNR: 8.55765169539298
Angular difference between the analysis and refined position is 1.385050 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 217.023999810219 +/- 23.5884935159922
Measured from: -138.743999958038
to: 78.2799998521805 [s; relative to TRIGTIME]
T50: 90.0479998588562 +/- 19.8181041459309
Measured from: -45.5599999427795
to: 44.4879999160767 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 41.8439999818802
to: 42.8439999818802 [s; relative to TRIGTIME]
Total Fluence
Measured from: -144.31200003624
to: 92.9359999895096 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.058027 1.382850 1.049393 0.353861
0.132552 0.137462 0.122907 0.114377 [error]
Peak 0.008246 0.037374 0.030884 -0.007082
0.009051 0.009151 0.008147 0.007443 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 237.248 -144.312 92.936
T90 217.024 -138.744 78.280
T50 90.048 -45.560 44.488
Peak 1.000 41.844 42.844
====== 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 -1.637 -0.199 0.195 - - - 1.07e-03 -1.24e-04 1.22e-04 49.520 57
CPL -1.617 -0.913 0.638 914.777 -914.777 -914.777 1.10e-03 -1.49e-04 9.08e-05 49.540 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 -1.309 -0.482 0.497 - - - 5.74e-03 -1.82e-03 1.82e-03 49.670 57
CPL 1.510 -2.378 5.100 65.232 -18.605 71.944 1.24e-01 -1.24e-01 5.06e+01 45.230 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 3.68e-07 6.22e-07 8.00e-07 2.07e-06 2.36e-06 3.86e-06 erg/cm2
90%_error_low -6.42e-08 -6.83e-08 -1.25e-07 -6.08e-07 -2.91e-07 -7.27e-07 erg/cm2
90%_error_hi 6.68e-08 6.80e-08 1.24e-07 7.60e-07 2.95e-07 8.48e-07 erg/cm2
Peak flux PL 1.96e-01 2.22e-01 1.79e-01 2.41e-01 6.85e-01 8.38e-01 ph/cm2/s
90%_error_low -9.65e-02 -7.95e-02 -6.35e-02 -1.33e-01 -2.23e-01 -2.69e-01 ph/cm2/s
90%_error_hi 1.17e-01 7.90e-02 6.34e-02 2.04e-01 2.26e-01 2.72e-01 ph/cm2/s
Fluence CPL 3.70e-07 6.17e-07 7.98e-07 2.13e-06 2.38e-06 3.79e-06 erg/cm2
90%_error_low -6.72e-08 -6.72e-08 -1.48e-07 -1.41e-06 -3.77e-07 -1.31e-06 erg/cm2
90%_error_hi 6.67e-08 9.27e-08 1.53e-07 3.13e-08 2.39e-07 8.81e-07 erg/cm2
Peak flux CPL 1.05e-01 2.61e-01 2.20e-01 3.97e-02 6.21e-01 6.25e-01 ph/cm2/s
90%_error_low -1.05e-01 -1.06e-01 -9.27e-02 -3.97e-02 -2.12e-01 -2.15e-01 ph/cm2/s
90%_error_hi 1.29e-01 1.10e-01 8.48e-02 1.38e-01 2.27e-01 2.45e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 295.2070 44.9327 0.0225 37.4705 -38.1741 3.6752889 8.558 TRIG_00952791 Foreground time interval of the image: -144.312 72.901 (delta_t = 217.213 [sec]) Background time interval of the image: -365.699 -346.468 (delta_t = 19.232 [sec]) -239.000 -144.312 (delta_t = 94.688 [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 -144.312 sec. to 92.936 sec. XSPEC12>exit XSPEC: quit Photon index: -1.63711 ( -0.19912 0.195305 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.63711 ( -0.195305 0.19912 ) Norm@50keV : 1.06888E-03 ( -0.000124075 0.000122314 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 237.2 sec: 0.138986 ( -0.015174 0.015199 ) ph/cm2/s Energy fluence (15-150 keV) : 2.36148e-06 ( -2.91414e-07 2.94987e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -144.312 sec. to 92.936 sec. XSPEC: quit Photon index: -1.63542 ( -0.912524 0.638454 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.63542 ( -0.638454 0.912524 ) Epeak [keV] : 1.00000E+04 ( -10000 -10000 ) Norm@50keV : 1.07120E-03 ( -0.000124867 0.000114741 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 237.2 sec: 0.139475 ( -0.017366 0.016135 ) ph/cm2/s Energy fluence (15-150 keV) : 2.37812e-06 ( -3.77314e-07 2.39368e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 41.844 sec. to 42.844 sec. XSPEC12>exit XSPEC: quit Photon index: -1.3092 ( -0.485391 0.493775 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.30920 ( -0.493775 0.485391 ) Norm@50keV : 5.73765E-03 ( -0.0018173 0.00181728 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 0.685393 ( -0.222695 0.226143 ) ph/cm2/s Energy fluence (15-150 keV) : 5.66096e-08 ( -1.88393e-08 1.92499e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 41.844 sec. to 42.844 sec. XSPEC: quit Photon index: 1.5104 ( -2.36325 5.11519 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.51040 ( -5.11519 2.36325 ) Epeak [keV] : 65.2321 ( -18.6144 71.9345 ) Norm@50keV : 0.123562 ( -0.123069 50.5871 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 0.621415 ( -0.21221 0.226551 ) ph/cm2/s Energy fluence (15-150 keV) : 4.95256e-08 ( -1.83554e-08 1.9924e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 217.024 sec. Hardness ratio (energy fluence ratio) = 1.28605620759
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 9.905991e-07 S(50-150 keV) = 1.370868e-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 = 6.025803937470950E-01, IMY = 4.737434617925653E-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: -365.699400 -346.467700 -239.000000 -144.312000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.5170 35.3285 7.3 42.8 -51.6 0.5747 1.6 8.4 Cyg X-1 308.2042 40.9325 4.1 34.2 -54.9 0.6411 2.8 4.4 Cyg X-3 326.0422 38.4075 6.4 28.5 -79.6 0.3741 1.8 8.0 Cyg X-2 341.8536 45.8081 2.4 16.7 -99.1 0.7414 4.9 ------ UNKNOWN 19.4724 6.6882 2.5 57.3 -160.9 3.6111 4.7 ------ UNKNOWN 272.3737 34.8817 3.0 56.3 -28.3 2.8075 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -144.312000 72.900630 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.5698 35.0665 5.2 43.0 -51.9 1.6908 2.2 8.2 Cyg X-1 308.2785 40.9173 3.0 34.2 -55.0 -1.7098 -3.9 7.9 Cyg X-3 326.0063 38.3504 6.6 28.6 -79.6 -0.7529 -1.8 8.0 Cyg X-2 236.1860 66.5387 2.3 44.8 19.4 3.0546 5.2 ------ UNKNOWN 17.5869 20.1191 2.2 43.8 -163.1 2.4526 5.3 ------ UNKNOWN 295.2069 44.9327 1.3 37.5 -38.2 3.6750 8.6 ------ UNKNOWN 325.3063 32.4653 2.4 34.1 -83.8 2.6723 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 129.500600 963.116100 965.000000 965.600600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4323 35.5016 4.0 32.2 12.6 1.8407 2.9 9.6 Her X-1 268.2694 -1.4465 14.4 52.2 -39.8 -2.5320 -0.8 5.9 SW J1753.5-0127 288.7689 11.0026 4.1 34.4 -63.5 2.6017 2.8 3.8 GRS 1915+105 299.4458 35.0981 5.2 10.3 -94.5 1.0999 2.2 9.4 Cyg X-1 308.0754 40.9727 1114.8 10.2 -146.6 0.0048 0.0 2.0 Cyg X-3 326.3493 38.3633 4.3 24.0 -160.0 1.5148 2.7 8.7 Cyg X-2 231.0932 27.6823 4.2 53.0 19.2 8.4410 2.7 ------ UNKNOWN 266.9269 56.9386 3.0 21.3 59.8 2.3504 3.8 ------ UNKNOWN 356.0426 42.7402 3.2 42.9 175.6 3.2376 3.6 ------ UNKNOWN 313.3523 44.4490 3.5 12.9 -169.2 1.6568 3.3 ------ UNKNOWN 256.7675 18.9898 2.6 41.0 -11.2 3.4103 4.4 ------ UNKNOWN 335.3435 18.7804 3.4 42.3 -139.9 3.4989 3.4 ------ UNKNOWN 354.3604 15.7793 3.0 57.2 -154.1 13.6089 3.9 ------ UNKNOWN 332.9147 9.5496 2.7 48.0 -129.1 10.1724 4.2 ------ UNKNOWN