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: Tue Sep 29 19:37:24 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger654803
======================================================================
Trigger: 00654803 Segment: 000
BAT Trigger Time: 463361202.88 [s; MET]
Trigger Stop: 463361203.904 [s; MET]
UTC: 2015-09-07T23:26:27.776600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 255.21911343847 Dec: -63.8189835807845 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.04
Image Trigger?: NO
Rate S/N Ratio: 11.13552872566 [ if not an image trigger ]
Image S/N Ratio: 7.04
Analysis Position: [ source = BAT ]
RA: 255.21911343847 Dec: -63.8189835807845 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 255.265059044636 Dec: -63.7972546017738 [deg; J2000]
{ 17h 01m 03.6s , -63d 47' 50.1" }
+/- 1.79607775809772 [arcmin] (estimated 90% radius based on SNR)
+/- 0.798249588095392 [arcmin] (formal 1-sigma fit error)
SNR: 13.1763996514911
Angular difference between the analysis and refined position is 1.783326 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 62.0199999213219 +/- 11.1246394732101
Measured from: -0.643999993801117
to: 61.3759999275208 [s; relative to TRIGTIME]
T50: 31.6439999341965 +/- 9.6358383082612
Measured from: 3.68400001525879
to: 35.3279999494553 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.592000007629395
to: 1.59200000762939 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.47600001096725
to: 64.5239999890327 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.347261 0.822605 0.537137 0.088839
0.068111 0.071243 0.063719 0.060416 [error]
Peak 0.012237 0.047377 0.045141 0.016828
0.008692 0.009293 0.008819 0.007863 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 66.000 -1.476 64.524
T90 62.020 -0.644 61.376
T50 31.644 3.684 35.328
Peak 1.000 0.592 1.592
====== 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 -1.470 -0.183 0.182 - - - 1.97e-03 -2.21e-04 2.20e-04 59.660 57
CPL -0.160 -0.905 1.153 67.579 -13.262 46.120 9.35e-03 -9.35e-03 2.69e-02 53.050 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 -0.900 -0.367 0.406 - - - 8.56e-03 -1.97e-03 1.91e-03 56.800 57
CPL -0.491 0.491 2.002 217.701 -217.701 -217.701 1.29e-02 -6.06e-03 7.02e-02 56.590 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 1.61e-07 3.02e-07 4.36e-07 1.34e-06 1.24e-06 2.24e-06 erg/cm2
90%_error_low -2.84e-08 -3.45e-08 -6.23e-08 -3.61e-07 -1.52e-07 -4.19e-07 erg/cm2
90%_error_hi 2.97e-08 3.43e-08 6.22e-08 4.42e-07 1.54e-07 4.84e-07 erg/cm2
Peak flux PL 1.99e-01 2.87e-01 3.07e-01 6.12e-01 9.83e-01 1.40e+00 ph/cm2/s
90%_error_low -8.68e-02 -8.56e-02 -6.79e-02 -2.48e-01 -2.22e-01 -3.18e-01 ph/cm2/s
90%_error_hi 1.03e-01 8.34e-02 6.73e-02 3.48e-01 2.24e-01 3.40e-01 ph/cm2/s
Fluence CPL 1.32e-07 3.44e-07 4.55e-07 2.76e-07 1.11e-06 1.21e-06 erg/cm2
90%_error_low -3.46e-08 -4.55e-08 -7.47e-08 -1.73e-07 -1.67e-07 -2.37e-07 erg/cm2
90%_error_hi 3.56e-08 4.77e-08 7.32e-08 4.68e-07 1.74e-07 4.77e-07 erg/cm2
Peak flux CPL 1.78e-01 2.92e-01 3.23e-01 4.15e-01 9.69e-01 1.21e+00 ph/cm2/s
90%_error_low -1.06e-01 -9.02e-02 -8.07e-02 -4.15e-01 -2.27e-01 -4.01e-01 ph/cm2/s
90%_error_hi 1.19e-01 9.25e-02 9.13e-02 2.82e-01 2.29e-01 4.49e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 255.2651 -63.7973 0.0146 32.5188 -56.6097 2.0201033 13.176 TRIG_00654803 Foreground time interval of the image: -1.476 64.524 (delta_t = 66.000 [sec]) Background time interval of the image: -172.379 -1.476 (delta_t = 170.903 [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 -1.476 sec. to 64.524 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.46989 ( -0.183292 0.181739 ) Norm@50keV : 1.97052E-03 ( -0.000220926 0.000219898 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.66 using 59 PHA bins. # Reduced chi-squared = 1.047 for 57 degrees of freedom # Null hypothesis probability = 3.793283e-01 Photon flux (15-150 keV) in 66 sec: 0.244066 ( -0.026998 0.027039 ) ph/cm2/s Energy fluence (15-150 keV) : 1.24023e-06 ( -1.51769e-07 1.53611e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.476 sec. to 64.524 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.159906 ( -0.905396 1.15323 ) Epeak [keV] : 67.5790 ( -13.2616 46.1207 ) Norm@50keV : 9.34686E-03 ( -0.00934716 0.0268954 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.05 using 59 PHA bins. # Reduced chi-squared = 0.9474 for 56 degrees of freedom # Null hypothesis probability = 5.871520e-01 Photon flux (15-150 keV) in 66 sec: 0.230824 ( -0.02853 0.028529 ) ph/cm2/s Energy fluence (15-150 keV) : 1.11489e-06 ( -1.66989e-07 1.7426e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.592 sec. to 1.592 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.900447 ( -0.366669 0.405687 ) Norm@50keV : 8.56152E-03 ( -0.00196599 0.00191471 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.80 using 59 PHA bins. # Reduced chi-squared = 0.9966 for 57 degrees of freedom # Null hypothesis probability = 4.823938e-01 Photon flux (15-150 keV) in 1 sec: 0.982667 ( -0.221558 0.223553 ) ph/cm2/s Energy fluence (15-150 keV) : 9.60771e-08 ( -2.14288e-08 2.15372e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.592 sec. to 1.592 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.49103 ( 0.491064 2.00217 ) Epeak [keV] : 217.701 ( -217.72 -217.72 ) Norm@50keV : 1.28931E-02 ( -0.00605636 0.0702131 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.59 using 59 PHA bins. # Reduced chi-squared = 1.010 for 56 degrees of freedom # Null hypothesis probability = 4.529759e-01 Photon flux (15-150 keV) in 1 sec: 0.968660 ( -0.227219 0.22899 ) ph/cm2/s Energy fluence (15-150 keV) : 9.45714e-08 ( -2.29257e-08 2.22467e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 62.02 sec. Hardness ratio (energy fluence ratio) = 1.44410894729
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.636166e-07 S(50-150 keV) = 7.76647e-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 = 3.508595748589869E-01, IMY = 5.323017757531378E-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: -172.379400 -1.476000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 256.0457 -37.8244 1.7 50.2 -27.0 2.8065 6.7 3.0 4U 1700-377 256.4019 -36.4897 4.4 51.1 -25.6 1.1441 2.6 4.3 GX 349+2 263.0126 -24.7435 64.9 57.7 -11.8 0.1631 0.2 0.2 GX 1+4 264.5630 -44.4116 17.8 41.0 -25.8 -0.1746 -0.6 8.0 4U 1735-44 270.2943 -24.9824 9.7 54.1 -5.1 -0.6381 -1.2 5.8 GX 5-1 270.2563 -25.6619 8.0 53.5 -5.6 0.7157 1.4 5.5 GRS 1758-258 275.8926 -30.4063 6.9 46.9 -3.3 0.5867 1.7 2.9 H1820-303 285.0643 -25.0827 5.1 47.5 9.9 0.9171 2.2 9.9 HT1900.1-2455 263.1007 -33.7591 48.8 50.1 -17.8 0.0874 0.2 7.2 GX 354-0 315.7945 -18.0757 2.3 44.7 50.9 3.6733 5.0 ------ UNKNOWN 42.6830 -33.6637 2.4 52.5 163.8 3.7937 4.8 ------ UNKNOWN 314.4113 -39.9764 2.7 23.7 39.2 0.8967 4.3 ------ UNKNOWN 56.8636 -36.3991 2.8 56.9 177.3 4.9134 4.1 ------ UNKNOWN 271.2885 -21.1976 2.8 56.9 -1.9 3.5728 4.1 ------ UNKNOWN 85.0215 -67.7228 2.8 42.3 -139.9 1.3215 4.2 ------ UNKNOWN 93.3797 -54.7704 4.4 55.3 -145.2 3.1337 2.6 ------ UNKNOWN 118.1173 -70.5013 2.4 46.0 -123.5 3.8284 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.476000 64.524000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 255.9614 -37.8961 5.3 50.1 -27.1 -0.6017 -2.2 3.3 4U 1700-377 256.3006 -36.4814 8.2 51.1 -25.7 -0.4178 -1.4 7.4 GX 349+2 262.9299 -24.8254 5.8 57.7 -11.9 1.1023 2.0 6.4 GX 1+4 264.6607 -44.3186 3.8 41.0 -25.6 0.5106 3.1 8.6 4U 1735-44 270.3209 -25.0233 3.6 54.1 -5.1 1.2355 3.2 3.9 GX 5-1 270.2516 -25.7466 30.8 53.5 -5.6 0.1293 0.4 2.8 GRS 1758-258 276.0090 -30.2846 24.1 47.0 -3.1 0.1000 0.5 6.6 H1820-303 285.0305 -24.7613 7.3 47.8 10.1 -0.4149 -1.6 9.6 HT1900.1-2455 262.8763 -33.9062 6.1 50.1 -18.1 0.4608 1.9 7.1 GX 354-0 304.6670 -37.9570 2.5 28.5 25.0 0.6302 4.6 ------ UNKNOWN 267.7415 -24.9755 2.5 55.3 -7.6 1.7626 4.6 ------ UNKNOWN 58.6372 -68.2760 2.3 34.6 -149.8 0.6650 5.0 ------ UNKNOWN 277.8179 -75.8608 2.5 22.5 -78.7 0.5816 4.7 ------ UNKNOWN 255.2651 -63.7973 0.9 32.5 -56.6 2.0193 13.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 620.320600 962.255300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4967 35.3723 10.4 54.5 -150.5 -1.5011 -1.1 2.6 Her X-1 299.5926 35.1714 1.0 33.9 164.7 4.8975 11.5 1.8 Cyg X-1 308.1014 40.9328 1.9 25.6 158.5 2.1008 6.0 1.3 Cyg X-3 326.1862 38.2804 4.7 23.5 124.4 0.8349 2.5 2.6 Cyg X-2 356.3466 25.1285 4.5 39.3 76.0 2.9782 2.5 ------ UNKNOWN 301.6755 17.8963 2.7 49.0 151.4 4.6047 4.2 ------ UNKNOWN 43.0256 31.0704 2.7 53.2 20.5 5.7564 4.2 ------ UNKNOWN 27.6611 41.3712 3.1 37.6 25.9 1.7505 3.7 ------ UNKNOWN 284.0790 27.3255 3.3 47.3 176.5 2.3481 3.5 ------ UNKNOWN 53.7404 53.1727 1.1 41.2 -7.2 4.6914 10.8 ------ UNKNOWN 250.4099 72.8963 3.3 31.3 -105.1 1.5009 3.5 ------ UNKNOWN 256.0595 28.6277 3.4 59.4 -156.4 8.8333 3.4 ------ UNKNOWN 249.4863 37.2688 6.0 55.3 -145.2 4.1193 1.9 ------ UNKNOWN 105.6046 62.8441 3.5 50.6 -44.7 5.3772 3.3 ------ UNKNOWN 241.8838 50.6772 3.1 48.1 -129.2 4.9038 3.8 ------ UNKNOWN