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 v2.48
Process Start Time: Sat Jul 30 00:15:44 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1031728
======================================================================
Trigger: 01031728 Segment: 000
BAT Trigger Time: 634615254.4 [s; MET]
Trigger Stop: 634615254.528 [s; MET]
UTC: 2021-02-10T02:00:27.919820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 262.810959176437 Dec: 14.6481728923598 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.51
Image Trigger?: NO
Rate S/N Ratio: 16.2480768092719 [ if not an image trigger ]
Image S/N Ratio: 7.51
Analysis Position: [ source = BAT ]
RA: 262.810959176437 Dec: 14.6481728923598 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 262.764483447191 Dec: 14.6573039152744 [deg; J2000]
{ 17h 31m 03.5s , +14d 39' 26.3" }
+/- 1.04144996993177 [arcmin] (estimated 90% radius based on SNR)
+/- 0.32826136979716 [arcmin] (formal 1-sigma fit error)
SNR: 28.7025610186316
Angular difference between the analysis and refined position is 2.752917 arcmin
Partial Coding Fraction: 0.4335938 [ including projection effects ]
Duration
T90: 6.60399997234344 +/- 0.589318239671799
Measured from: -0.407999992370605
to: 6.19599997997284 [s; relative to TRIGTIME]
T50: 4.34799993038177 +/- 0.216333035530084
Measured from: 0.476000070571899
to: 4.82400000095367 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.21200001239777
to: 5.21200001239777 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.751999974250793
to: 6.92799997329712 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.936207 0.809704 0.275279 0.017331
0.039703 0.037204 0.030143 0.027126 [error]
Peak 0.287070 0.298754 0.126939 0.010200
0.017441 0.017456 0.012911 0.009981 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 7.680 -0.752 6.928
T90 6.604 -0.408 6.196
T50 4.348 0.476 4.824
Peak 1.000 4.212 5.212
====== 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 -2.464 -0.124 0.119 - - - 1.39e-02 -1.12e-03 1.11e-03 53.970 57
CPL -1.530 -0.546 0.613 19.907 -19.001 8.711 4.91e-02 -2.34e-02 6.33e-02 44.350 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 -2.196 -0.129 0.124 - - - 4.23e-02 -3.57e-03 3.52e-03 47.520 57
CPL -1.405 -0.565 0.657 32.290 -27.320 8.227 1.18e-01 -6.07e-02 1.60e-01 41.540 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 3.40e-07 3.49e-07 2.53e-07 2.94e-07 1.06e-06 1.24e-06 erg/cm2
90%_error_low -2.78e-08 -2.04e-08 -2.79e-08 -5.91e-08 -6.60e-08 -9.67e-08 erg/cm2
90%_error_hi 2.83e-08 2.04e-08 2.86e-08 6.87e-08 6.66e-08 1.02e-07 erg/cm2
Peak flux PL 3.41e+00 2.28e+00 9.96e-01 5.99e-01 6.98e+00 7.29e+00 ph/cm2/s
90%_error_low -3.41e-01 -1.56e-01 -1.09e-01 -1.17e-01 -4.94e-01 -5.02e-01 ph/cm2/s
90%_error_hi 3.49e-01 1.56e-01 1.10e-01 1.32e-01 4.95e-01 5.02e-01 ph/cm2/s
Fluence CPL N/A N/A N/A N/A N/A N/A erg/cm2
90%_error_low -2.78e-08 -2.04e-08 -2.79e-08 -5.91e-08 -6.60e-08 -9.67e-08 erg/cm2
90%_error_hi 2.83e-08 2.04e-08 2.86e-08 6.87e-08 6.66e-08 1.02e-07 erg/cm2
Peak flux CPL 3.11e+00 2.48e+00 9.99e-01 2.41e-01 6.77e+00 6.83e+00 ph/cm2/s
90%_error_low -4.03e-01 -2.10e-01 -1.26e-01 -1.19e-01 -5.16e-01 -5.39e-01 ph/cm2/s
90%_error_hi 4.06e-01 2.16e-01 1.23e-01 2.15e-01 5.16e-01 5.52e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 262.7645 14.6573 0.0067 35.4797 153.9452 2.1914406 28.703 TRIG_01031728 Foreground time interval of the image: -0.752 6.928 (delta_t = 7.680 [sec]) Background time interval of the image: -239.400 -0.752 (delta_t = 238.648 [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 -0.752 sec. to 6.928 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.46429 ( -0.123576 0.119037 ) Norm@50keV : 1.38734E-02 ( -0.00112208 0.00111038 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 53.97 using 59 bins. Reduced chi-squared = 0.946842 # Null hypothesis probability of 5.89e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 7.68 sec: 2.66722 ( -0.15878 0.15919 ) ph/cm2/s Energy fluence (15-150 keV) : 1.05578e-06 ( -6.59687e-08 6.65544e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.752 sec. to 6.928 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.52961 ( -0.545883 0.613248 ) Epeak [keV] : 19.9070 ( -18.9993 8.71249 ) Norm@50keV : 4.90931E-02 ( -0.0234213 0.0633336 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 44.35 using 59 bins. Reduced chi-squared = 0.791964 # Null hypothesis probability of 8.69e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 7.68 sec: 2.54303 ( -0.17208 0.17255 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 4.212 sec. to 5.212 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.19601 ( -0.128978 0.12416 ) Norm@50keV : 4.22615E-02 ( -0.00357381 0.00352174 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 47.52 using 59 bins. Reduced chi-squared = 0.833684 # Null hypothesis probability of 8.10e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 6.98260 ( -0.49407 0.49485 ) ph/cm2/s Energy fluence (15-150 keV) : 3.97201e-07 ( -2.97326e-08 2.99388e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.212 sec. to 5.212 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.40528 ( -0.565406 0.657351 ) Epeak [keV] : 32.2900 ( -27.3208 8.22665 ) Norm@50keV : 0.118216 ( -0.0607465 0.159942 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 41.54 using 59 bins. Reduced chi-squared = 0.741786 # Null hypothesis probability of 9.25e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 6.77266 ( -0.51632 0.51643 ) ph/cm2/s Energy fluence (15-150 keV) : 3.75803e-07 ( -3.25929e-08 3.32221e-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 = -6.403252999875310E-01, IMY = -3.130657203826239E-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: -239.400000 -0.752000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9772 -15.6563 0.6 26.7 84.4 8.4299 19.3 1.0 Sco X-1 255.9964 -37.8403 2.3 23.5 25.6 1.6187 5.1 0.5 4U 1700-377 256.2959 -36.2976 5.1 22.2 27.9 0.7275 2.3 10.1 GX 349+2 263.0022 -24.7876 3.0 10.5 48.3 1.1198 3.8 2.5 GX 1+4 264.8881 -44.5999 27.4 26.0 3.6 -0.1381 -0.4 10.9 4U 1735-44 268.3560 -1.4511 18.3 18.5 156.8 0.2039 0.6 0.7 SW J1753.5-0127 270.2006 -25.2178 9.4 6.2 12.5 -0.4165 -1.2 9.5 GX 5-1 270.3448 -25.8217 4.2 6.8 9.5 1.0301 2.9 5.2 GRS 1758-258 274.1603 -14.0348 49.7 5.6 -175.0 -0.0669 -0.2 9.0 GX 17+2 275.8695 -30.4096 6.0 11.3 -23.0 0.6045 1.9 3.8 H1820-303 285.1866 -25.0774 0.0 12.8 -70.8 0.5153 1.8 12.5 HT1900.1-2455 288.9316 10.9890 9.0 34.3 -160.2 0.4794 1.3 8.3 GRS 1915+105 262.9940 -33.8379 33.2 16.8 19.9 0.0989 0.3 0.3 GX 354-0 219.5291 -51.0835 3.1 52.2 30.3 5.3816 3.7 ------ UNKNOWN 254.7570 28.5362 2.9 51.0 150.3 5.2152 4.0 ------ UNKNOWN 255.7003 -48.7837 1.9 32.4 11.9 2.6056 6.1 ------ UNKNOWN 304.4290 29.6344 3.7 57.8 -156.6 6.4835 3.1 ------ UNKNOWN 314.1931 -35.8089 3.2 39.8 -66.2 3.3410 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.752000 6.928000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0860 -15.8159 0.0 26.6 84.1 0.1415 2.1 12.2 Sco X-1 256.1986 -37.7461 5.4 23.3 25.5 -0.0993 -2.1 11.6 4U 1700-377 256.3568 -36.3459 9.4 22.2 27.8 0.0545 1.2 6.0 GX 349+2 262.9053 -24.8758 18.6 10.6 48.1 0.0293 0.6 9.6 GX 1+4 264.8818 -44.6192 4.7 26.0 3.6 0.1247 2.5 11.8 4U 1735-44 268.3838 -1.6034 18.4 18.3 156.7 0.0270 0.6 9.1 SW J1753.5-0127 270.2717 -25.2074 6.5 6.2 12.0 0.0738 1.8 7.7 GX 5-1 270.1506 -25.8066 8.3 6.8 10.9 -0.0614 -1.5 9.0 GRS 1758-258 273.8671 -13.9312 7.4 5.6 -178.1 0.0656 1.5 10.3 GX 17+2 276.0830 -30.4549 5.4 11.4 -23.9 -0.0896 -2.2 9.7 H1820-303 285.0726 -24.9002 102.5 12.6 -71.4 0.0049 0.1 2.3 HT1900.1-2455 288.9094 10.8258 16.0 34.2 -160.1 0.0415 0.7 9.7 GRS 1915+105 263.0173 -33.8189 4.9 16.8 19.9 0.0997 2.3 1.7 GX 354-0 225.8723 -28.9597 2.5 43.5 58.8 1.0067 4.7 ------ UNKNOWN 262.7645 14.6573 0.4 35.5 153.9 2.1915 28.7 ------ UNKNOWN 273.9007 20.2528 2.3 39.7 172.4 0.3468 5.0 ------ UNKNOWN 275.3513 8.5928 1.9 28.1 176.2 0.3036 5.9 ------ UNKNOWN 285.0481 36.5263 2.4 57.2 -177.5 1.0857 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 65.700590 962.653700 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9655 -15.6267 0.4 35.0 8.3 30.4578 28.6 1.1 Sco X-1 254.2558 35.3160 47.6 22.1 138.5 -0.2639 -0.2 10.0 Her X-1 255.9856 -37.8598 4.2 52.9 -15.9 6.8066 2.8 0.9 4U 1700-377 256.3072 -36.4005 22.3 51.4 -16.0 -1.1491 -0.5 6.3 GX 349+2 263.0106 -24.7463 43.2 39.4 -23.0 0.3614 0.3 0.1 GX 1+4 268.3854 -1.5079 14.7 17.1 -42.0 -0.6541 -0.8 3.5 SW J1753.5-0127 270.3025 -25.0935 65.5 40.4 -33.2 0.2453 0.2 1.3 GX 5-1 270.3008 -25.7434 3.8 41.0 -33.0 4.0091 3.0 0.1 GRS 1758-258 274.0328 -14.1927 6.1 30.9 -44.2 2.6160 1.9 9.5 GX 17+2 275.9354 -30.3135 5.0 46.7 -38.3 4.5380 2.3 3.3 H1820-303 284.9537 -24.7794 0.0 44.9 -51.6 -5.3636 -2.1 9.6 HT1900.1-2455 288.7404 11.1373 34.1 25.5 -107.9 0.3800 0.3 12.0 GRS 1915+105 299.5408 35.1757 2.3 38.8 -151.4 7.4952 5.0 2.9 Cyg X-1 308.0819 40.9488 3.0 47.2 -155.6 7.2552 3.9 1.3 Cyg X-3 263.0805 -33.8476 7.5 48.5 -23.0 -2.9152 -1.5 4.6 GX 354-0 221.4292 13.4344 3.7 40.1 70.9 10.0167 3.2 ------ UNKNOWN 221.6696 -8.6001 3.5 46.9 40.2 8.8168 3.3 ------ UNKNOWN 298.9760 66.1540 2.7 56.8 173.9 21.4826 4.3 ------ UNKNOWN 287.0224 17.3901 3.0 23.4 -122.7 3.5550 3.9 ------ UNKNOWN 287.8043 -2.9700 2.7 30.4 -79.2 5.5330 4.3 ------ UNKNOWN