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 Sep 28 17:50:46 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger770957
======================================================================
Trigger: 00770957 Segment: 000
BAT Trigger Time: 526351411.264 [s; MET]
Trigger Stop: 526351412.288 [s; MET]
UTC: 2017-09-06T00:43:11.622660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 203.991655598506 Dec: -47.124728592814 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.35
Image Trigger?: NO
Rate S/N Ratio: 24.3104915622864 [ if not an image trigger ]
Image S/N Ratio: 8.35
Analysis Position: [ source = BAT ]
RA: 203.991655598506 Dec: -47.124728592814 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 203.945573361657 Dec: -47.0885303150939 [deg; J2000]
{ 13h 35m 46.9s , -47d 05' 18.7" }
+/- 1.33934869290171 [arcmin] (estimated 90% radius based on SNR)
+/- 0.493920680954233 [arcmin] (formal 1-sigma fit error)
SNR: 20.0374164938389
Angular difference between the analysis and refined position is 2.873801 arcmin
Partial Coding Fraction: 0.671875 [ including projection effects ]
Duration
T90: 88.1119999289513 +/- 1.44479753054543
Measured from: 8.00800001621246
to: 96.1199999451637 [s; relative to TRIGTIME]
T50: 42.3839999437332 +/- 0.440218133833484
Measured from: 30.3360000252724
to: 72.7199999690056 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 29.8199999928474
to: 30.8199999928474 [s; relative to TRIGTIME]
Total Fluence
Measured from: -44.755999982357
to: 122.860000014305 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 12.576611 18.670394 15.732775 4.395113
0.116344 0.120897 0.107762 0.083602 [error]
Peak 0.263770 0.466308 0.491167 0.189101
0.012184 0.014824 0.015209 0.011726 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 167.616 -44.756 122.860
T90 88.112 8.008 96.120
T50 42.384 30.336 72.720
Peak 1.000 29.820 30.820
====== 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 -1.342 -0.024 0.024 - - - 2.02e-02 -2.77e-04 2.76e-04 27.990 57
CPL -1.294 -0.056 0.086 944.728 -944.728 -944.728 2.10e-02 -4.08e-04 1.63e-03 27.700 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 -0.969 -0.062 0.062 - - - 9.35e-02 -3.21e-03 3.21e-03 53.160 57
CPL -0.970 -0.057 0.073 9999.340 -9999.340 -9999.340 9.34e-02 -2.47e-03 2.29e-02 53.370 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 3.72e-06 7.53e-06 1.19e-05 4.16e-05 3.31e-05 6.47e-05 erg/cm2
90%_error_low -1.14e-07 -1.38e-07 -1.55e-07 -1.29e-06 -4.15e-07 -1.31e-06 erg/cm2
90%_error_hi 1.16e-07 1.38e-07 1.55e-07 1.32e-06 4.14e-07 1.33e-06 erg/cm2
Peak flux PL 9.44e-04 1.14e-02 1.56e-01 1.34e+01 5.56e-01 1.02e+01 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A N/A ph/cm2/s
Fluence CPL 3.68e-06 7.58e-06 1.19e-05 4.16e-05 3.30e-05 6.27e-05 erg/cm2
90%_error_low -1.65e-07 -2.03e-07 -1.59e-07 -5.68e-06 -4.49e-07 -3.43e-06 erg/cm2
90%_error_hi 1.30e-07 9.70e-08 2.21e-07 6.40e-07 4.53e-07 2.41e-06 erg/cm2
Peak flux CPL 2.32e+00 3.21e+00 3.28e+00 6.09e+00 1.08e+01 1.49e+01 ph/cm2/s
90%_error_low -2.17e-01 -1.31e-01 -1.22e-01 -1.32e+00 -3.83e-01 -1.33e+00 ph/cm2/s
90%_error_hi 1.71e-01 1.17e-01 1.46e-01 5.11e-01 3.73e-01 5.28e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 203.9456 -47.0885 0.0096 20.6734 -86.8903 3.7103026 20.037 TRIG_00770957 Foreground time interval of the image: -44.756 13.037 (delta_t = 57.793 [sec]) Background time interval of the image: -98.363 -44.756 (delta_t = 53.607 [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 -44.756 sec. to 122.860 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.34152 ( -0.0243739 0.0244646 ) Norm@50keV : 2.01596E-02 ( -0.000276681 0.000275866 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 27.99 using 59 PHA bins. # Reduced chi-squared = 0.4910 for 57 degrees of freedom # Null hypothesis probability = 9.995662e-01 Photon flux (15-150 keV) in 167.6 sec: 2.42449 ( -0.03948 0.03969 ) ph/cm2/s Energy fluence (15-150 keV) : 3.3067e-05 ( -4.15412e-07 4.14455e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -44.756 sec. to 122.860 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.29355 ( -0.0547155 0.0869832 ) Epeak [keV] : 944.728 ( -981.04 -981.04 ) Norm@50keV : 2.10480E-02 ( -0.000355557 0.00168469 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 27.70 using 59 PHA bins. # Reduced chi-squared = 0.4947 for 56 degrees of freedom # Null hypothesis probability = 9.994582e-01 Photon flux (15-150 keV) in 167.6 sec: 1.57864 ( -0.06215 0.03559 ) ph/cm2/s Energy fluence (15-150 keV) : 3.30212e-05 ( -4.49253e-07 4.53271e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 29.820 sec. to 30.820 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.9687 ( -0.061851 0.0623362 ) Norm@50keV : 9.35257E-02 ( -0.00321391 0.00320781 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.16 using 59 PHA bins. # Reduced chi-squared = 0.9327 for 57 degrees of freedom # Null hypothesis probability = 6.197866e-01 Photon flux (15-150 keV) in 1 sec: 0.555697 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.02289e-06 ( -3.8471e-08 3.85856e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 29.820 sec. to 30.820 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.970125 ( -0.0632722 0.0663618 ) Epeak [keV] : 9999.34 ( -9999.36 -9999.36 ) Norm@50keV : 9.33929E-02 ( -0.00317996 0.0221972 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.37 using 59 PHA bins. # Reduced chi-squared = 0.9530 for 56 degrees of freedom # Null hypothesis probability = 5.751268e-01 Photon flux (15-150 keV) in 1 sec: 10.7518 ( -0.3831 0.3734 ) ph/cm2/s Energy fluence (15-150 keV) : 1.02308e-06 ( -3.789e-08 3.49306e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 88.112 sec. Hardness ratio (energy fluence ratio) = 1.57844680698
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.1251038e-05 S(50-150 keV) = 2.1815505e-05
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 = 2.046991096713631E-02, IMY = 3.767828298925605E-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: -98.363410 -44.756000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.4450 -60.6850 1.8 31.6 -136.7 0.8750 6.4 5.3 Cen X-3 186.5757 -62.9800 0.0 23.6 -137.1 0.2693 2.2 12.8 GX 301-2 245.0100 -15.6318 0.9 42.4 2.8 2.1720 12.4 1.8 Sco X-1 256.0407 -37.8468 1.4 24.3 33.3 0.9954 8.3 2.6 4U 1700-377 256.2887 -36.3036 2.9 25.7 32.0 0.4832 3.9 10.1 GX 349+2 262.8372 -24.6061 5.9 38.7 31.6 -0.3765 -2.0 12.6 GX 1+4 264.5645 -44.3261 3.0 23.1 55.9 0.4770 3.8 10.7 4U 1735-44 270.4199 -25.0907 4.8 41.4 41.4 0.5724 2.4 7.4 GX 5-1 270.2188 -25.7681 347.0 40.7 41.7 0.0079 0.0 4.8 GRS 1758-258 276.1221 -30.4079 4.8 39.6 52.4 0.5811 2.4 10.5 H1820-303 263.1636 -33.8515 112.6 30.7 39.7 -0.0159 -0.1 8.8 GX 354-0 275.5002 -41.5771 1.9 30.7 64.2 0.9804 6.1 ------ UNKNOWN 233.8352 -57.2113 0.4 0.0 65.7 3.0946 30.6 ------ UNKNOWN 109.2905 -71.1480 2.5 45.8 -171.6 0.9110 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -44.756000 13.036600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.6432 -60.6722 4.7 31.5 -136.6 -0.4755 -2.4 10.1 Cen X-3 186.6647 -62.7524 255.3 23.6 -136.5 0.0072 0.0 1.1 GX 301-2 244.8731 -15.5467 6.8 42.5 2.6 0.3910 1.7 8.3 Sco X-1 256.1661 -37.8462 4.1 24.3 33.5 -0.4335 -2.8 8.5 4U 1700-377 256.3152 -36.2974 3.5 25.8 32.0 -0.5420 -3.3 9.5 GX 349+2 262.8783 -24.7962 18.3 38.6 31.8 0.1597 0.6 7.7 GX 1+4 264.7826 -44.4509 41.3 23.1 56.5 -0.0490 -0.3 1.7 4U 1735-44 270.2910 -25.0613 368.1 41.4 41.3 -0.0107 -0.0 1.1 GX 5-1 270.2992 -25.7364 97.0 40.8 41.8 -0.0397 -0.1 0.4 GRS 1758-258 275.8501 -30.3118 12.7 39.5 52.0 0.3090 0.9 5.1 H1820-303 263.1550 -33.8332 11.6 30.7 39.6 -0.2074 -1.0 8.3 GX 354-0 203.9456 -47.0885 0.6 20.7 -86.9 3.7100 20.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 56.836590 602.748700 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4712 -40.6693 16.2 48.2 -154.2 1.3506 0.7 7.4 Vela X-1 170.3143 -60.6503 2.0 23.6 177.3 3.7061 5.9 1.6 Cen X-3 186.6660 -62.6144 4.5 18.3 160.5 1.6816 2.5 9.4 GX 301-2 244.9887 -15.6405 0.8 46.2 15.6 17.2859 13.9 0.5 Sco X-1 255.9867 -37.8193 2.9 38.7 50.1 5.1559 4.0 1.5 4U 1700-377 256.2727 -36.2724 4.4 39.7 48.2 3.2496 2.6 12.0 GX 349+2 264.7763 -44.4352 619.3 41.4 64.0 -0.0430 -0.0 1.7 4U 1735-44 262.9001 -33.6844 4.6 45.6 49.5 6.1518 2.5 10.1 GX 354-0 99.9699 -84.1279 2.4 44.6 142.7 7.7356 4.8 ------ UNKNOWN 233.8484 -57.2303 0.3 20.6 84.8 30.6271 40.6 ------ UNKNOWN 111.9867 -60.6200 2.7 51.2 173.5 7.8197 4.3 ------ UNKNOWN 203.9689 -47.1024 0.3 0.1 -99.2 25.2494 42.8 ------ UNKNOWN 145.9452 -36.2670 4.1 43.7 -142.9 4.4156 2.8 ------ UNKNOWN 191.1997 -4.9670 3.1 43.6 -64.2 13.1963 3.7 ------ UNKNOWN 207.6195 5.3411 2.9 52.6 -41.0 17.3922 4.0 ------ UNKNOWN 148.9460 -25.7026 3.7 48.0 -129.0 14.2568 3.2 ------ UNKNOWN