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: Thu Apr 5 17:37:37 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger813721
======================================================================
Trigger: 00813721 Segment: 000
BAT Trigger Time: 542484249.856 [s; MET]
Trigger Stop: 542484258.048 [s; MET]
UTC: 2018-03-11T18:03:49.248040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 3.43345521460187 Dec: -54.4789735818177 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.58
Image Trigger?: NO
Rate S/N Ratio: 10 [ if not an image trigger ]
Image S/N Ratio: 8.58
Analysis Position: [ source = BAT ]
RA: 3.43345521460187 Dec: -54.4789735818177 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 3.37934331062735 Dec: -54.4907346705799 [deg; J2000]
{ 00h 13m 31.0s , -54d 29' 26.6" }
+/- 2.29200675215556 [arcmin] (estimated 90% radius based on SNR)
+/- 0.829827612774513 [arcmin] (formal 1-sigma fit error)
SNR: 9.30088442031222
Angular difference between the analysis and refined position is 2.013763 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 23.039999961853 +/- 8.71246656581249
Measured from: 0.720000028610229
to: 23.7599999904633 [s; relative to TRIGTIME]
T50: 8.6399998664856 +/- 8.98761462925503
Measured from: 3.34400010108948
to: 11.9839999675751 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.87600004673004
to: 3.87600004673004 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.239999890327454
to: 26.5760000944138 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.232061 0.227337 0.108858 0.041243
0.033005 0.034387 0.030431 0.027897 [error]
Peak 0.014623 0.036197 0.010613 0.003063
0.006502 0.006893 0.006189 0.005498 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 26.816 -0.240 26.576
T90 23.040 0.720 23.760
T50 8.640 3.344 11.984
Peak 1.000 2.876 3.876
====== 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 -1.781 -0.295 0.279 - - - 1.35e-03 -2.66e-04 2.59e-04 65.740 57
CPL -0.767 -1.256 1.675 49.633 -14.813 -49.633 5.32e-03 -5.32e-03 4.72e-02 63.740 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 -1.497 -0.465 0.456 - - - 4.65e-03 -1.34e-03 1.32e-03 58.460 57
CPL 0.043 -1.921 5.794 55.605 -29.436 -55.605 3.55e-02 -3.55e-02 7.11e+01 57.650 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 6.02e-08 9.31e-08 1.08e-07 2.43e-07 3.33e-07 5.05e-07 erg/cm2
90%_error_low -1.35e-08 -1.52e-08 -2.80e-08 -1.05e-07 -6.59e-08 -1.39e-07 erg/cm2
90%_error_hi 1.40e-08 1.52e-08 2.88e-08 1.48e-07 6.81e-08 1.75e-07 erg/cm2
Peak flux PL 1.91e-01 1.92e-01 1.36e-01 1.54e-01 5.80e-01 6.73e-01 ph/cm2/s
90%_error_low -7.80e-02 -5.43e-02 -4.86e-02 -8.59e-02 -1.58e-01 -1.87e-01 ph/cm2/s
90%_error_hi 8.52e-02 5.36e-02 4.86e-02 1.36e-01 1.58e-01 1.92e-01 ph/cm2/s
Fluence CPL 5.61e-08 1.06e-07 1.02e-07 4.84e-08 2.97e-07 3.12e-07 erg/cm2
90%_error_low -1.54e-08 -2.13e-08 -3.76e-08 -4.20e-08 -6.87e-08 -8.25e-08 erg/cm2
90%_error_hi 1.52e-08 2.26e-08 3.39e-08 2.35e-07 7.93e-08 2.60e-07 erg/cm2
Peak flux CPL 1.63e-01 2.33e-01 1.29e-01 2.14e-02 5.44e-01 5.48e-01 ph/cm2/s
90%_error_low -1.63e-01 -8.14e-02 N/A -2.14e-02 -1.70e-01 -1.74e-01 ph/cm2/s
90%_error_hi 9.96e-02 9.43e-02 N/A 1.63e-01 1.73e-01 2.52e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
3.3793 -54.4907 0.0207 22.4434 -24.8268 0.6360123 9.301 TRIG_00813721
Foreground time interval of the image:
-0.240 26.576 (delta_t = 26.816 [sec])
Background time interval of the image:
-120.755 -0.240 (delta_t = 120.515 [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 -0.240 sec. to 26.576 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.7812 ( -0.295251 0.278611 ) Norm@50keV : 1.34819E-03 ( -0.000266005 0.000259217 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.74 using 59 PHA bins. # Reduced chi-squared = 1.153 for 57 degrees of freedom # Null hypothesis probability = 1.998164e-01 Photon flux (15-150 keV) in 26.82 sec: 0.184450 ( -0.030088 0.030087 ) ph/cm2/s Energy fluence (15-150 keV) : 3.33179e-07 ( -6.58611e-08 6.81477e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.240 sec. to 26.576 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.767125 ( -1.25601 1.67488 ) Epeak [keV] : 49.6334 ( -14.8131 -49.6336 ) Norm@50keV : 5.32061E-03 ( -0.00532052 0.0471835 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.74 using 59 PHA bins. # Reduced chi-squared = 1.138 for 56 degrees of freedom # Null hypothesis probability = 2.228788e-01 Photon flux (15-150 keV) in 26.82 sec: 0.178535 ( -0.030635 0.030853 ) ph/cm2/s Energy fluence (15-150 keV) : 2.97131e-07 ( -6.86611e-08 7.92772e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.876 sec. to 3.876 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.49676 ( -0.464579 0.456278 ) Norm@50keV : 4.64930E-03 ( -0.00134404 0.001316 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.46 using 59 PHA bins. # Reduced chi-squared = 1.026 for 57 degrees of freedom # Null hypothesis probability = 4.214304e-01 Photon flux (15-150 keV) in 1 sec: 0.579926 ( -0.157594 0.157739 ) ph/cm2/s Energy fluence (15-150 keV) : 4.41347e-08 ( -1.36424e-08 1.41601e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.876 sec. to 3.876 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.0433537 ( -1.98086 5.73376 ) Epeak [keV] : 55.6053 ( -28.3185 -54.4878 ) Norm@50keV : 3.54719E-02 ( -0.0427686 71.069 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.65 using 59 PHA bins. # Reduced chi-squared = 1.029 for 56 degrees of freedom # Null hypothesis probability = 4.141636e-01 Photon flux (15-150 keV) in 1 sec: 0.543888 ( -0.170057 0.173148 ) ph/cm2/s Energy fluence (15-150 keV) : 3.58311e-08 ( -1.34563e-08 1.99594e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 23.04 sec. Hardness ratio (energy fluence ratio) = 1.16383051565
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.5330371e-07 S(50-150 keV) = 1.7987899e-07
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 = 3.748826821832090E-01, IMY = 1.734327299215789E-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: -120.755410 -0.240000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 255.9322 -37.9030 6.6 46.8 140.8 1.2255 1.7 4.4 4U 1700-377 256.3176 -36.5724 5.6 47.6 142.3 1.5470 2.0 10.6 GX 349+2 262.9207 -24.7462 5.0 53.4 157.6 -2.0243 -2.3 4.8 GX 1+4 264.6124 -44.3319 2.8 37.7 140.9 -1.2002 -4.1 9.0 4U 1735-44 270.2271 -25.0871 7.9 49.3 164.3 0.8059 1.5 3.1 GX 5-1 270.2133 -25.7615 4.1 48.8 163.8 1.5206 2.9 4.9 GRS 1758-258 273.9123 -14.0279 15.0 57.0 175.2 -0.7226 -0.8 5.5 GX 17+2 275.8541 -30.5588 0.0 42.0 165.7 0.2008 0.6 12.1 H1820-303 285.0110 -25.1054 0.0 42.3 -179.8 0.5761 2.1 11.2 HT1900.1-2455 262.9548 -33.8443 8.3 46.1 150.4 0.7387 1.4 1.8 GX 354-0 22.2631 -47.2255 1.9 36.3 -24.4 1.2360 6.1 ------ UNKNOWN 340.9899 -40.6421 2.4 20.7 -82.1 0.8377 4.8 ------ UNKNOWN 340.4017 -18.7712 3.9 41.1 -98.3 2.0846 3.0 ------ UNKNOWN 13.0456 -26.4439 3.3 46.9 -53.8 2.5805 3.5 ------ UNKNOWN 318.9782 -9.7718 2.8 48.1 -129.2 2.9951 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.240000 26.576000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 256.1597 -37.7518 4.9 46.8 141.1 0.6566 2.4 9.9 4U 1700-377 256.2563 -36.5972 8.7 47.6 142.2 -0.4184 -1.3 13.6 GX 349+2 263.0881 -24.7348 5.1 53.3 157.8 -0.8240 -2.3 4.4 GX 1+4 264.5669 -44.6274 0.0 37.5 140.5 0.1876 1.5 13.0 4U 1735-44 270.3810 -24.9933 5.5 49.3 164.6 -0.4863 -2.1 7.4 GX 5-1 270.2335 -25.6101 5.7 48.9 164.0 0.4533 2.0 8.8 GRS 1758-258 273.9271 -14.0679 7.4 57.0 175.2 0.6973 1.6 5.0 GX 17+2 275.8520 -30.4510 7.0 42.1 165.8 0.2299 1.6 6.3 H1820-303 285.0110 -25.1054 0.0 42.3 -179.8 -0.2065 -1.8 11.2 HT1900.1-2455 262.8498 -34.0205 0.0 46.1 150.1 0.3676 1.7 13.1 GX 354-0 3.3793 -54.4907 1.2 22.4 -24.8 0.6361 9.3 ------ UNKNOWN 299.9598 -22.6468 2.5 38.8 -159.0 0.4413 4.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 259.244600 782.268200 840.144000 962.187600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 142.6086 -83.0621 2.9 41.0 98.1 8.8276 4.0 ------ UNKNOWN 11.1613 -29.2483 3.6 25.8 -59.4 1.9684 3.2 ------ UNKNOWN 46.8527 -9.6099 3.0 56.5 -20.6 8.9206 3.9 ------ UNKNOWN 46.3990 -9.2678 2.7 56.6 -21.3 9.5842 4.3 ------ UNKNOWN