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: Sun Nov 1 01:39:05 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger656604
======================================================================
Trigger: 00656604 Segment: 000
BAT Trigger Time: 464846984 [s; MET]
Trigger Stop: 464847048 [s; MET]
UTC: 2015-09-25T04:09:28.817940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 227.519805836203 Dec: -19.6283015106395 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.64
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 12.64
Analysis Position: [ source = BAT ]
RA: 227.519805836203 Dec: -19.6283015106395 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 227.538143173026 Dec: -19.642350325229 [deg; J2000]
{ 15h 10m 09.2s , -19d 38' 32.5" }
+/- 1.97887450924328 [arcmin] (estimated 90% radius based on SNR)
+/- 0.818669140176688 [arcmin] (formal 1-sigma fit error)
SNR: 11.472649643631
Angular difference between the analysis and refined position is 1.335802 arcmin
Partial Coding Fraction: 0.5625 [ including projection effects ]
Duration
T90: 122.131999969482 +/- 26.6956809453882
Measured from: 10.3479999899864
to: 132.479999959469 [s; relative to TRIGTIME]
T50: 41.8159999847412 +/- 26.2243614449715
Measured from: 23.4359999895096
to: 65.2519999742508 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 30.6840000152588
to: 31.6840000152588 [s; relative to TRIGTIME]
Total Fluence
Measured from: 3.50800001621246
to: 149.611999988556 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.071338 1.016705 0.467501 0.052398
0.097165 0.091601 0.075329 0.062976 [error]
Peak 0.022957 0.025264 0.021554 0.007989
0.009154 0.008666 0.007114 0.006043 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 146.104 3.508 149.612
T90 122.132 10.348 132.480
T50 41.816 23.436 65.252
Peak 1.000 30.684 31.684
====== 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 -2.186 -0.209 0.197 - - - 9.96e-04 -1.39e-04 1.36e-04 68.580 57
CPL -2.175 -0.046 1.462 9999.360 -9996.780 -9955.621 1.01e-03 -2.23e-04 6.43e-03 68.600 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 -1.503 -0.634 0.625 - - - 5.00e-03 -1.69e-03 1.67e-03 53.480 57
CPL -1.207 -1.323 4.542 145.114 -145.114 -145.114 6.90e-03 N/A N/A 53.440 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 3.55e-07 4.31e-07 3.79e-07 5.73e-07 1.37e-06 1.74e-06 erg/cm2
90%_error_low -5.05e-08 -4.53e-08 -7.10e-08 -1.86e-07 -1.64e-07 -2.78e-07 erg/cm2
90%_error_hi 5.17e-08 4.52e-08 7.30e-08 2.38e-07 1.67e-07 3.16e-07 erg/cm2
Peak flux PL 2.06e-01 2.07e-01 1.46e-01 1.64e-01 6.25e-01 7.24e-01 ph/cm2/s
90%_error_low -1.14e-01 -8.00e-02 -6.12e-02 -1.07e-01 -2.18e-01 -2.41e-01 ph/cm2/s
90%_error_hi 1.38e-01 7.65e-02 5.86e-02 1.84e-01 2.21e-01 2.42e-01 ph/cm2/s
Fluence CPL 3.41e-07 4.58e-07 3.65e-07 2.29e-07 1.30e-06 1.39e-06 erg/cm2
90%_error_low -5.60e-08 -5.72e-08 -8.68e-08 -1.69e-07 -1.84e-07 -2.62e-07 erg/cm2
90%_error_hi 5.54e-08 6.20e-08 8.06e-08 4.08e-07 1.92e-07 5.30e-07 erg/cm2
Peak flux CPL 1.93e-01 2.12e-01 1.51e-01 1.22e-01 6.15e-01 6.78e-01 ph/cm2/s
90%_error_low N/A -8.35e-02 N/A -1.22e-01 -2.54e-01 -3.15e-01 ph/cm2/s
90%_error_hi N/A 9.14e-02 N/A 2.17e-01 2.26e-01 2.82e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 227.5381 -19.6424 0.0168 35.4829 -37.8599 2.0309088 11.473 TRIG_00656604 Foreground time interval of the image: 3.508 73.301 (delta_t = 69.793 [sec]) Background time interval of the image: -75.099 3.508 (delta_t = 78.607 [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 3.508 sec. to 149.612 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.18603 ( -0.209194 0.196776 ) Norm@50keV : 9.95853E-04 ( -0.000138913 0.000135769 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 68.58 using 59 PHA bins. # Reduced chi-squared = 1.203 for 57 degrees of freedom # Null hypothesis probability = 1.399735e-01 Photon flux (15-150 keV) in 146.1 sec: 0.163682 ( -0.016986 0.016996 ) ph/cm2/s Energy fluence (15-150 keV) : 1.36559e-06 ( -1.64237e-07 1.67368e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.508 sec. to 149.612 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.66344 ( -0.557941 0.949894 ) Epeak [keV] : 25.9700 ( -23.3909 17.7688 ) Norm@50keV : 2.02476E-03 ( -0.00124295 0.00540873 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 67.29 using 59 PHA bins. # Reduced chi-squared = 1.202 for 56 degrees of freedom # Null hypothesis probability = 1.435166e-01 Photon flux (15-150 keV) in 146.1 sec: 0.160473 ( -0.017628 0.017634 ) ph/cm2/s Energy fluence (15-150 keV) : 1.29712e-06 ( -1.84364e-07 1.92311e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 30.684 sec. to 31.684 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.5031 ( -0.634018 0.625211 ) Norm@50keV : 5.00191E-03 ( -0.0016913 0.00167326 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.48 using 59 PHA bins. # Reduced chi-squared = 0.9382 for 57 degrees of freedom # Null hypothesis probability = 6.080994e-01 Photon flux (15-150 keV) in 1 sec: 0.624971 ( -0.218258 0.220902 ) ph/cm2/s Energy fluence (15-150 keV) : 4.74329e-08 ( -1.6916e-08 1.72099e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 30.684 sec. to 31.684 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.20715 ( -1.32286 4.54204 ) Epeak [keV] : 145.114 ( -145.039 -145.039 ) Norm@50keV : 6.89846E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.44 using 59 PHA bins. # Reduced chi-squared = 0.9543 for 56 degrees of freedom # Null hypothesis probability = 5.724276e-01 Photon flux (15-150 keV) in 1 sec: 0.615133 ( -0.254406 0.22637 ) ph/cm2/s Energy fluence (15-150 keV) : 4.67175e-08 ( -1.81179e-08 1.77484e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 122.132 sec. Hardness ratio (energy fluence ratio) = 0.879083415804
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 7.864985e-07 S(50-150 keV) = 5.791055e-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 = 5.627998803694407E-01, IMY = 4.374961680509125E-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: -75.099400 3.508000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.4457 -60.5341 6.2 35.2 -149.2 0.2871 1.9 6.6 Cen X-3 186.3474 -62.7943 3.8 27.3 -150.0 0.3872 3.0 8.6 GX 301-2 244.9770 -15.6382 0.6 39.0 -10.1 2.8984 19.0 0.2 Sco X-1 255.7895 -37.9544 4.9 20.4 23.3 0.2603 2.3 11.4 4U 1700-377 256.6028 -36.4879 5.2 22.0 22.7 0.2558 2.2 9.0 GX 349+2 262.9999 -24.5963 15.3 35.1 21.3 0.1264 0.8 9.0 GX 1+4 264.9016 -44.5795 5.9 20.0 51.0 -0.2525 -2.0 10.3 4U 1735-44 270.2050 -25.0763 7.8 37.8 31.4 0.2966 1.5 4.3 GX 5-1 270.3346 -25.7516 7.9 37.3 32.1 0.2955 1.4 1.8 GRS 1758-258 273.9829 -13.8966 7.6 49.3 28.0 -0.6536 -1.5 8.5 GX 17+2 275.8521 -30.2852 43.4 36.3 43.1 -0.0565 -0.3 6.2 H1820-303 285.0893 -24.9352 40.8 45.5 48.1 -0.1378 -0.3 3.0 HT1900.1-2455 263.1550 -33.8851 2.7 27.1 30.4 0.5580 4.3 8.8 GX 354-0 283.3387 -29.1405 2.4 41.2 50.1 1.5365 4.7 ------ UNKNOWN 268.1685 -43.5692 2.9 22.4 52.9 0.5360 3.9 ------ UNKNOWN 256.7454 0.1464 2.3 56.6 1.8 2.9211 4.9 ------ UNKNOWN 186.1867 -55.9752 2.5 28.8 -135.9 0.6047 4.6 ------ UNKNOWN 139.8377 -49.8373 3.1 55.4 -150.2 1.9500 3.7 ------ UNKNOWN 229.0789 -1.0024 2.0 53.7 -31.9 2.7710 5.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 3.508000 73.300600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.5863 -60.5052 5.7 35.1 -149.1 -0.3460 -2.0 10.7 Cen X-3 186.9427 -62.8577 3.5 27.0 -150.1 0.4674 3.3 9.4 GX 301-2 245.0464 -15.8110 0.0 38.9 -9.9 0.2393 1.3 11.0 Sco X-1 256.0417 -37.7483 5.1 20.7 23.4 0.3305 2.3 6.3 4U 1700-377 256.4564 -36.3569 29.5 22.1 22.3 0.0562 0.4 4.1 GX 349+2 262.8691 -24.7861 4.1 34.9 21.2 0.5248 2.8 8.0 GX 1+4 264.6221 -44.4411 5.8 19.9 50.4 0.3093 2.0 5.2 4U 1735-44 270.4107 -25.0135 6.5 37.9 31.6 0.4090 1.8 7.9 GX 5-1 270.4283 -25.6101 0.0 37.4 32.1 -0.2007 -0.9 10.5 GRS 1758-258 274.1059 -14.0567 6.7 49.2 28.3 -0.8881 -1.7 5.9 GX 17+2 276.0853 -30.3669 5.6 36.3 43.5 0.5518 2.1 8.3 H1820-303 285.2219 -25.0446 7.5 45.5 48.3 0.8516 1.5 12.6 HT1900.1-2455 262.9909 -33.6880 24.2 27.2 29.9 0.0727 0.5 8.8 GX 354-0 58.9645 -72.6245 2.3 53.1 159.3 3.6914 5.0 ------ UNKNOWN 157.6475 -84.2043 2.3 35.1 168.8 0.9118 5.0 ------ UNKNOWN 230.4324 -57.2413 2.9 5.1 -150.1 0.4881 4.1 ------ UNKNOWN 234.1219 -25.1256 2.3 29.3 -27.9 0.7544 5.1 ------ UNKNOWN 227.5381 -19.6423 1.0 35.5 -37.9 2.0312 11.5 ------ UNKNOWN 145.2021 -58.7071 2.2 47.1 -156.1 1.3332 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 129.100600 963.055900 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.2513 -60.6128 8.1 57.2 -167.6 4.9838 1.4 2.0 Cen X-3 186.6994 -62.7471 5.8 51.3 -174.5 4.0188 2.0 1.8 GX 301-2 244.9801 -15.6368 0.2 17.1 62.3 34.8508 48.1 0.2 Sco X-1 255.9857 -37.7985 1.6 30.7 115.4 8.8448 7.2 2.7 4U 1700-377 256.4406 -36.4078 564.7 30.4 112.6 -0.0260 -0.0 0.9 GX 349+2 263.1808 -24.6295 0.0 33.3 88.2 -1.0078 -0.6 11.7 GX 1+4 264.9456 -44.3856 5.3 39.7 120.1 4.9808 2.2 9.5 4U 1735-44 268.4710 -1.5573 4.6 43.9 53.8 7.2433 2.5 8.8 SW J1753.5-0127 262.9892 -33.8349 18.8 34.5 104.7 1.0643 0.6 0.0 GX 354-0 269.6871 -20.3347 2.4 39.5 81.5 13.7070 4.7 ------ UNKNOWN 168.3546 -58.9887 3.6 57.6 -165.4 11.6129 3.2 ------ UNKNOWN 200.3760 -4.4805 3.3 30.5 -80.8 3.7436 3.5 ------ UNKNOWN 175.4627 -29.1936 2.9 48.0 -129.1 15.7953 3.9 ------ UNKNOWN