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 Aug 30 18:14:51 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger650617
======================================================================
Trigger: 00650617 Segment: 000
BAT Trigger Time: 459780685.952 [s; MET]
Trigger Stop: 459780686.976 [s; MET]
UTC: 2015-07-28T12:51:11.036780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 292.287805747232 Dec: 33.9039039617548 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.74
Image Trigger?: NO
Rate S/N Ratio: 7.93725393319377 [ if not an image trigger ]
Image S/N Ratio: 6.74
Analysis Position: [ source = BAT ]
RA: 292.287805747232 Dec: 33.9039039617548 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 292.271249895788 Dec: 33.9058805610823 [deg; J2000]
{ 19h 29m 05.1s , +33d 54' 21.2" }
+/- 2.59616397126304 [arcmin] (estimated 90% radius based on SNR)
+/- 1.14634336460646 [arcmin] (formal 1-sigma fit error)
SNR: 7.78422451294506
Angular difference between the analysis and refined position is 0.832933 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.832000017166138 +/- 0.230755269859374
Measured from: 0.303999960422516
to: 1.13599997758865 [s; relative to TRIGTIME]
T50: 0.448000013828278 +/- 0.181019365655138
Measured from: 0.431999981403351
to: 0.879999995231628 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.219999969005585
to: 1.21999996900558 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.239999949932098
to: 1.19999998807907 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.025261 0.022351 0.015465 0.007699
0.005317 0.005404 0.004486 0.003591 [error]
Peak 0.026412 0.020252 0.017060 0.007577
0.005417 0.005507 0.004585 0.003664 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 0.960 0.240 1.200
T90 0.832 0.304 1.136
T50 0.448 0.432 0.880
Peak 1.000 0.220 1.220
====== 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 -2.018 -0.517 0.445 - - - 3.68e-03 -1.22e-03 1.13e-03 54.460 57
CPL -2.079 -0.516 1.109 37.420 N/A N/A 3.26e-03 N/A N/A 54.310 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 -1.962 -0.520 0.449 - - - 3.68e-03 -1.19e-03 1.09e-03 58.130 57
CPL -1.969 -0.515 0.459 9999.360 N/A N/A 3.67e-03 N/A N/A 58.140 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 7.36e-09 9.87e-09 9.75e-09 1.73e-08 3.26e-08 4.43e-08 erg/cm2
90%_error_low -2.27e-09 -2.35e-09 -4.16e-09 -1.11e-08 -9.43e-09 -1.69e-08 erg/cm2
90%_error_hi 2.33e-09 2.29e-09 4.40e-09 1.98e-08 9.91e-09 2.37e-08 erg/cm2
Peak flux PL 2.37e-01 1.81e-01 9.32e-02 6.88e-02 5.43e-01 5.80e-01 ph/cm2/s
90%_error_low -7.67e-02 -4.16e-02 -3.83e-02 -4.25e-02 -1.23e-01 -1.35e-01 ph/cm2/s
90%_error_hi 7.98e-02 4.14e-02 3.91e-02 7.04e-02 1.23e-01 1.36e-01 ph/cm2/s
Fluence CPL 7.20e-09 9.68e-09 9.99e-09 2.24e-08 3.30e-08 4.85e-08 erg/cm2
90%_error_low -2.61e-09 -2.84e-09 N/A -1.38e-08 N/A -4.74e-08 erg/cm2
90%_error_hi 2.10e-09 2.53e-09 N/A 4.94e-09 N/A 1.16e-08 erg/cm2
Peak flux CPL 2.31e-01 1.76e-01 9.30e-02 8.26e-02 5.32e-01 5.80e-01 ph/cm2/s
90%_error_low -8.61e-02 -6.53e-02 N/A -8.26e-02 -1.95e-01 -2.10e-01 ph/cm2/s
90%_error_hi 8.59e-02 4.39e-02 N/A 1.61e-02 1.34e-01 1.41e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 292.2712 33.9059 0.0248 11.3888 -173.9397 0.0753820 7.784 TRIG_00650617 Foreground time interval of the image: 0.240 1.200 (delta_t = 0.960 [sec]) Background time interval of the image: -239.952 0.240 (delta_t = 240.192 [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 1.200 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.01826 ( -0.517055 0.445039 ) Norm@50keV : 3.68008E-03 ( -0.00121558 0.00112565 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.46 using 59 PHA bins. # Reduced chi-squared = 0.9554 for 57 degrees of freedom # Null hypothesis probability = 5.709601e-01 Photon flux (15-150 keV) in 0.96 sec: 0.556756 ( -0.125609 0.12559 ) ph/cm2/s Energy fluence (15-150 keV) : 3.26191e-08 ( -9.42531e-09 9.91248e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.240 sec. to 1.200 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.41447 ( -0.179873 1.44549 ) Epeak [keV] : 152.051 ( ) Norm@50keV : 2.29724E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.07 using 59 PHA bins. # Reduced chi-squared = 0.9655 for 56 degrees of freedom # Null hypothesis probability = 5.484302e-01 Photon flux (15-150 keV) in 0.96 sec: 0.561186 ( -0.196507 0.12296 ) ph/cm2/s Energy fluence (15-150 keV) : 3.30165e-08 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.220 sec. to 1.220 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.96165 ( -0.52015 0.449209 ) Norm@50keV : 3.68241E-03 ( -0.00119289 0.0010936 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.13 using 59 PHA bins. # Reduced chi-squared = 1.020 for 57 degrees of freedom # Null hypothesis probability = 4.333085e-01 Photon flux (15-150 keV) in 1 sec: 0.542883 ( -0.12292 0.122921 ) ph/cm2/s Energy fluence (15-150 keV) : 3.39063e-08 ( -9.81501e-09 1.02589e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.220 sec. to 1.220 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.17691 ( -0.515107 0.459002 ) Epeak [keV] : 72.3533 ( ) Norm@50keV : 2.77464E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.79 using 59 PHA bins. # Reduced chi-squared = 1.032 for 56 degrees of freedom # Null hypothesis probability = 4.090746e-01 Photon flux (15-150 keV) in 1 sec: 0.532259 ( -0.194692 0.133691 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 0.832 sec. Hardness ratio (energy fluence ratio) = 0.9874388488
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.7227051e-08 S(50-150 keV) = 1.539168e-08
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 = -2.003064599409896E-01, IMY = 2.126625601115743E-02
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: -239.952000 0.240000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3794 35.3516 7.3 42.0 -160.8 0.4858 1.6 3.9 Her X-1 268.5665 -1.5668 0.0 49.9 144.5 0.7346 0.7 13.7 SW J1753.5-0127 288.9254 11.0331 10.6 27.6 130.3 0.2533 1.1 9.1 GRS 1915+105 299.5951 35.1990 0.4 5.4 -161.9 5.0082 26.0 0.3 Cyg X-1 308.1174 40.9593 0.8 7.3 -75.4 2.3934 14.0 0.5 Cyg X-3 326.1711 38.3207 22.4 16.9 -19.3 0.0976 0.5 0.1 Cyg X-2 350.9669 20.4716 2.7 41.8 8.7 1.2571 4.2 ------ UNKNOWN 286.7703 25.5346 2.9 18.6 160.5 0.7340 4.0 ------ UNKNOWN 13.0748 50.9553 2.7 50.5 -39.3 3.4248 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.240000 1.200000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3808 35.2409 4.1 42.1 -161.0 -0.0438 -2.8 7.2 Her X-1 268.4225 -1.4427 35.9 49.9 144.8 -0.0181 -0.3 3.3 SW J1753.5-0127 288.7835 10.8360 4.7 27.9 130.3 -0.0326 -2.4 6.6 GRS 1915+105 299.5878 35.3413 667.5 5.5 -160.5 0.0002 0.0 8.4 Cyg X-1 307.9153 40.8459 6.9 7.2 -76.4 0.0154 1.7 10.9 Cyg X-3 326.3286 38.1511 0.0 17.0 -18.6 0.0093 1.0 12.6 Cyg X-2 292.2713 33.9059 1.5 11.4 -173.9 0.0754 7.8 ------ UNKNOWN 2.9587 29.4664 2.6 48.1 -9.3 0.0811 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 53.948590 962.101700 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4879 35.5537 0.0 30.9 -148.2 0.1678 0.3 12.8 Her X-1 268.2710 -1.3509 4.5 41.9 145.4 3.7626 2.5 8.4 SW J1753.5-0127 288.9653 10.9108 5.2 23.2 116.2 1.4399 2.2 10.1 GRS 1915+105 299.5989 35.1961 0.3 6.1 3.7 19.1278 38.7 0.5 Cyg X-1 308.1252 40.9347 0.7 14.4 -16.0 9.7508 17.2 1.3 Cyg X-3 326.1144 38.4246 4.8 27.5 -1.4 1.3434 2.4 6.7 Cyg X-2 323.5758 13.2799 2.7 35.1 46.3 3.8765 4.2 ------ UNKNOWN 252.2547 -1.4847 2.8 51.6 163.0 9.0978 4.2 ------ UNKNOWN 289.3801 23.2356 3.3 11.0 122.1 1.7998 3.5 ------ UNKNOWN 260.3519 25.5745 2.7 28.8 -170.3 2.3398 4.2 ------ UNKNOWN 338.1437 50.0677 3.1 37.0 -22.2 2.6185 3.7 ------ UNKNOWN 313.6700 54.6779 2.8 25.6 -42.9 2.3484 4.1 ------ UNKNOWN 231.5749 15.0234 4.7 57.6 -165.4 6.8582 2.4 ------ UNKNOWN 256.9583 48.4477 2.8 29.9 -122.4 2.9166 4.1 ------ UNKNOWN