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 14:56:25 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger952164
======================================================================
Trigger: 00952164 Segment: 000
BAT Trigger Time: 601644723.52 [s; MET]
Trigger Stop: 601644731.712 [s; MET]
UTC: 2020-01-25T11:31:39.198280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 228.046615901226 Dec: -8.14842299022016 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.97
Image Trigger?: NO
Rate S/N Ratio: 12.2065556157337 [ if not an image trigger ]
Image S/N Ratio: 7.97
Analysis Position: [ source = BAT ]
RA: 228.046615901226 Dec: -8.14842299022016 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 228.067911024607 Dec: -8.1430974325944 [deg; J2000]
{ 15h 12m 16.3s , -08d 08' 35.2" }
+/- 1.76284880357712 [arcmin] (estimated 90% radius based on SNR)
+/- 0.77932839887792 [arcmin] (formal 1-sigma fit error)
SNR: 13.532641364843
Angular difference between the analysis and refined position is 1.304554 arcmin
Partial Coding Fraction: 0.4296875 [ including projection effects ]
Duration
T90: 350.335999965668 +/- 32.9667786948281
Measured from: -15.472000002861
to: 334.863999962807 [s; relative to TRIGTIME]
T50: 203.567999958992 +/- 97.4935448830085
Measured from: 86.6319999694824
to: 290.199999928474 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 286.667999982834
to: 287.667999982834 [s; relative to TRIGTIME]
Total Fluence
Measured from: -36.2239999771118
to: 427.736000061035 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.754344 6.107282 3.486750 0.325476
0.173227 0.169513 0.160615 0.177839 [error]
Peak 0.134782 0.179606 0.141984 0.019489
0.008327 0.009012 0.008233 0.007304 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 463.960 -36.224 427.736
T90 350.336 -15.472 334.864
T50 203.568 86.632 290.200
Peak 1.000 286.668 287.668
====== 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 -1.926 -0.080 0.079 - - - 1.97e-03 -8.48e-05 8.42e-05 43.250 57
CPL -1.819 -0.281 0.307 76.929 -76.649 -76.929 2.25e-03 -6.17e-04 9.95e-04 42.860 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
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 -1.428 -0.098 0.098 - - - 3.09e-02 -1.78e-03 1.77e-03 55.530 57
CPL -0.857 -0.402 0.444 98.824 -23.832 110.031 6.03e-02 -2.22e-02 3.98e-02 49.410 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 1.75e-06 2.48e-06 2.61e-06 5.07e-06 8.43e-06 1.19e-05 erg/cm2
90%_error_low -1.13e-07 -9.27e-08 -1.60e-07 -6.42e-07 -3.52e-07 -7.74e-07 erg/cm2
90%_error_hi 1.16e-07 9.27e-08 1.62e-07 7.08e-07 3.55e-07 8.26e-07 erg/cm2
Peak flux PL 1.19e+00 1.25e+00 9.27e-01 1.11e+00 3.79e+00 4.47e+00 ph/cm2/s
90%_error_low -1.14e-01 -7.47e-02 -6.71e-02 -1.57e-01 -2.14e-01 -2.59e-01 ph/cm2/s
90%_error_hi 1.17e-01 7.44e-02 6.68e-02 1.73e-01 2.14e-01 2.61e-01 ph/cm2/s
Fluence CPL 1.72e-06 2.50e-06 2.60e-06 4.18e-06 8.32e-06 1.10e-05 erg/cm2
90%_error_low -1.37e-07 -1.07e-07 -1.65e-07 -1.64e-06 -4.57e-07 -1.74e-06 erg/cm2
90%_error_hi 1.39e-07 1.10e-07 1.64e-07 1.05e-06 3.65e-07 1.20e-06 erg/cm2
Peak flux CPL 1.07e+00 1.31e+00 9.62e-01 5.85e-01 3.68e+00 3.93e+00 ph/cm2/s
90%_error_low -1.38e-01 -8.84e-02 -7.43e-02 -2.01e-01 -2.26e-01 -3.12e-01 ph/cm2/s
90%_error_hi 1.40e-01 9.00e-02 7.53e-02 3.24e-01 2.26e-01 3.85e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 228.0679 -8.1431 0.0142 28.9555 102.3775 3.7006276 13.533 TRIG_00952164 Foreground time interval of the image: -36.224 51.181 (delta_t = 87.405 [sec]) Background time interval of the image: -179.520 -36.224 (delta_t = 143.296 [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 -36.224 sec. to 427.736 sec. XSPEC12>exit XSPEC: quit Photon index: -1.92625 ( -0.0803958 0.0794065 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.92625 ( -0.0794065 0.0803958 ) Norm@50keV : 1.97480E-03 ( -8.48055e-05 8.41574e-05 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 464 sec: 0.286635 ( -0.011211 0.011264 ) ph/cm2/s Energy fluence (15-150 keV) : 8.42884e-06 ( -3.52435e-07 3.55276e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -36.224 sec. to 427.736 sec. XSPEC: quit Photon index: -1.81938 ( -0.280538 0.307464 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.81938 ( -0.307464 0.280538 ) Epeak [keV] : 76.9287 ( -76.6492 -76.9287 ) Norm@50keV : 2.24982E-03 ( -0.000617302 0.000995471 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 464 sec: 0.284136 ( -0.012999 0.012157 ) ph/cm2/s Energy fluence (15-150 keV) : 8.3178e-06 ( -4.568e-07 3.65361e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 286.668 sec. to 287.668 sec. XSPEC12>exit XSPEC: quit Photon index: -1.42834 ( -0.0980997 0.0976247 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.42834 ( -0.0976247 0.0980997 ) Norm@50keV : 3.09016E-02 ( -0.00177604 0.00177093 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 3.78824 ( -0.21397 0.2141 ) ph/cm2/s Energy fluence (15-150 keV) : 2.96955e-07 ( -1.90861e-08 1.92364e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 286.668 sec. to 287.668 sec. XSPEC: quit Photon index: -0.857137 ( -0.401904 0.444487 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.857137 ( -0.444487 0.401904 ) Epeak [keV] : 98.8243 ( -23.8325 110.031 ) Norm@50keV : 6.02877E-02 ( -0.0221856 0.0397545 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 3.68417 ( -0.22607 0.2258 ) ph/cm2/s Energy fluence (15-150 keV) : 2.82319e-07 ( -2.15776e-08 2.17135e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 350.336 sec. Hardness ratio (energy fluence ratio) = 1.0524706167
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.228619e-06 S(50-150 keV) = 4.200178e-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 = -1.185997824627540E-01, IMY = -5.404326637733795E-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: -179.520000 -36.224000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9755 -15.6410 0.5 10.8 104.3 5.5615 22.0 0.2 Sco X-1 254.3954 35.4952 0.0 55.5 171.1 -1.1240 -0.7 9.7 Her X-1 255.9863 -37.8613 2.9 17.8 -9.5 0.9725 4.0 1.0 4U 1700-377 256.4615 -36.4294 1.9 16.4 -11.1 1.3953 5.9 1.3 GX 349+2 262.9936 -24.7345 14.2 8.5 -62.8 0.1954 0.8 1.1 GX 1+4 264.7523 -44.4250 7.2 25.6 -23.6 0.3940 1.6 1.6 4U 1735-44 268.5175 -1.3230 0.0 22.7 -151.8 -0.0605 -0.2 11.9 SW J1753.5-0127 270.4547 -24.9776 17.3 14.8 -75.6 -0.1762 -0.7 11.1 GX 5-1 270.3413 -25.6568 6.3 14.9 -72.9 -0.4858 -1.8 5.6 GRS 1758-258 274.1613 -13.9451 10.2 19.0 -113.7 0.3127 1.1 10.6 GX 17+2 275.7544 -30.2755 5.3 21.1 -64.8 0.5637 2.2 10.4 H1820-303 285.0513 -24.8738 12.4 27.8 -82.4 -0.3263 -0.9 2.9 HT1900.1-2455 288.6534 11.1198 0.0 45.2 -138.6 1.3566 2.1 13.5 GRS 1915+105 263.1464 -33.9913 13.8 15.6 -32.6 0.2041 0.8 12.2 GX 354-0 223.3780 -3.9909 3.7 35.0 105.1 1.6630 3.1 ------ UNKNOWN 224.4589 -7.7782 3.0 32.3 99.9 1.7382 3.9 ------ UNKNOWN 255.2504 -18.1935 2.9 1.8 168.6 0.8906 4.0 ------ UNKNOWN 243.7030 -63.1354 3.1 43.8 -0.4 1.6892 3.8 ------ UNKNOWN 255.3754 -41.7330 2.6 21.7 -8.0 1.1251 4.5 ------ UNKNOWN 267.3076 -48.5928 2.3 30.1 -23.8 1.3224 5.0 ------ UNKNOWN 272.9033 17.1526 2.4 41.0 -161.9 1.8968 4.8 ------ UNKNOWN UNKNOWN UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -36.224000 51.180590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.1089 -15.7807 8.8 10.6 103.9 0.2333 1.3 11.3 Sco X-1 254.5284 35.2159 3.9 55.2 171.2 2.7554 3.0 8.3 Her X-1 256.1396 -38.0102 0.0 18.0 -9.9 -0.4126 -2.4 12.3 4U 1700-377 256.6244 -36.3751 7.8 16.4 -11.5 -0.2538 -1.5 9.6 GX 349+2 263.0089 -24.7460 945.2 8.5 -62.8 -0.0019 -0.0 0.0 GX 1+4 264.6188 -44.5966 10.1 25.7 -23.2 0.2088 1.1 10.3 4U 1735-44 268.5175 -1.3230 0.0 22.7 -151.8 0.2361 1.3 11.9 SW J1753.5-0127 270.4567 -24.9384 0.0 14.8 -75.7 0.3123 1.7 12.6 GX 5-1 270.4536 -25.8920 8.3 15.1 -72.2 0.2604 1.4 12.1 GRS 1758-258 274.0818 -14.1846 11.1 18.8 -113.1 0.2070 1.0 9.9 GX 17+2 275.8186 -30.5129 6.1 21.2 -64.3 0.3668 1.9 10.3 H1820-303 285.0902 -24.9341 16.8 27.8 -82.2 0.1845 0.7 3.1 HT1900.1-2455 288.6556 11.0945 11.7 45.2 -138.5 -0.4198 -1.0 12.3 GRS 1915+105 263.0113 -33.8372 11.4 15.4 -32.6 0.1732 1.0 1.1 GX 354-0 228.0679 -8.1431 0.9 29.0 102.4 3.7002 13.5 ------ UNKNOWN 301.7538 -37.5935 1.8 43.7 -64.0 4.3607 6.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 100.980580 412.980600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9633 -15.6312 0.4 18.1 -81.7 11.5118 27.3 1.1 Sco X-1 254.4588 35.3668 8.7 50.1 -169.4 1.3358 1.3 1.5 Her X-1 255.9880 -37.8431 3.4 38.9 -53.6 2.6302 3.4 0.1 4U 1700-377 256.4786 -36.4817 3.8 38.3 -55.7 2.3577 3.1 4.1 GX 349+2 263.0377 -24.8007 3.1 37.3 -76.8 3.5579 3.7 3.7 GX 1+4 268.2231 -1.4455 9.7 40.5 -115.0 -1.2762 -1.2 8.7 SW J1753.5-0127 262.8856 -33.7172 7.0 41.0 -64.0 -1.8609 -1.7 8.7 GX 354-0 217.6388 30.3898 3.5 39.8 148.3 2.6426 3.3 ------ UNKNOWN 228.0377 -8.1547 0.4 0.0 85.5 12.0567 32.6 ------ UNKNOWN 227.5276 -38.5248 3.2 30.4 -16.7 1.5995 3.6 ------ UNKNOWN