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: Sat Jan 11 23:45:47 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger566561
======================================================================
Trigger: 00566561 Segment: 000
BAT Trigger Time: 398321629.504 [s; MET]
Trigger Stop: 398321630.528 [s; MET]
UTC: 2013-08-16T04:53:38.587620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 170.092535443697 Dec: -57.5581832376266 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.39
Image Trigger?: NO
Rate S/N Ratio: 16.062378404209 [ if not an image trigger ]
Image S/N Ratio: 10.39
Analysis Position: [ source = BAT ]
RA: 170.092535443697 Dec: -57.5581832376266 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 170.047101745408 Dec: -57.5377683993217 [deg; J2000]
{ 11h 20m 11.3s , -57d 32' 16.0" }
+/- 1.59443637830679 [arcmin] (estimated 90% radius based on SNR)
+/- 0.555378595485049 [arcmin] (formal 1-sigma fit error)
SNR: 15.619946088531
Angular difference between the analysis and refined position is 1.907888 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 8.67599999904633 +/- 2.34176005165807
Measured from: -3.16400003433228
to: 5.51199996471405 [s; relative to TRIGTIME]
T50: 2.60399997234344 +/- 0.66971335751184
Measured from: -1.39200001955032
to: 1.21199995279312 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.167999982833862
to: 1.16799998283386 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.73600000143051
to: 7.66799998283386 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.178608 0.236588 0.105671 0.008653
0.017589 0.018012 0.015598 0.013595 [error]
Peak 0.041756 0.056238 0.031595 0.001000
0.005556 0.005804 0.004957 0.004268 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 11.404 -3.736 7.668
T90 8.676 -3.164 5.512
T50 2.604 -1.392 1.212
Peak 1.000 0.168 1.168
====== 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 -1.827 -0.175 0.168 - - - 2.73e-03 -3.16e-04 3.12e-04 66.250 57
CPL -0.339 -0.876 1.101 46.220 -6.874 12.820 1.97e-02 -1.97e-02 6.74e-02 56.660 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 -1.667 -0.207 0.202 - - - 7.66e-03 -1.09e-03 1.08e-03 51.140 57
CPL 0.225 -1.060 1.371 48.874 -7.912 14.845 9.52e-02 -9.52e-02 5.18e-01 40.210 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 5.42e-08 8.16e-08 9.20e-08 1.97e-07 2.87e-07 4.25e-07 erg/cm2
90%_error_low -7.38e-09 -7.88e-09 -1.42e-08 -5.44e-08 -3.32e-08 -7.09e-08 erg/cm2
90%_error_hi 7.56e-09 7.88e-09 1.44e-08 6.68e-08 3.39e-08 8.06e-08 erg/cm2
Peak flux PL 3.70e-01 3.38e-01 2.13e-01 2.05e-01 1.01e+00 1.13e+00 ph/cm2/s
90%_error_low -6.68e-02 -4.32e-02 -3.81e-02 -6.21e-02 -1.28e-01 -1.48e-01 ph/cm2/s
90%_error_hi 6.91e-02 4.32e-02 3.85e-02 7.70e-02 1.28e-01 1.49e-01 ph/cm2/s
Fluence CPL 4.75e-08 9.62e-08 8.44e-08 2.55e-08 2.48e-07 2.53e-07 erg/cm2
90%_error_low -8.56e-09 -1.14e-08 -1.96e-08 N/A -3.43e-08 -3.85e-08 erg/cm2
90%_error_hi 8.61e-09 1.19e-08 1.82e-08 N/A 3.79e-08 5.90e-08 erg/cm2
Peak flux CPL 3.12e-01 4.19e-01 2.05e-01 2.69e-02 9.60e-01 9.63e-01 ph/cm2/s
90%_error_low -7.64e-02 -6.21e-02 -5.39e-02 -2.69e-02 -1.28e-01 -1.29e-01 ph/cm2/s
90%_error_hi 7.80e-02 6.51e-02 4.97e-02 5.10e-02 1.29e-01 1.33e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 170.0471 -57.5378 0.0123 14.2408 -131.4742 0.5193268 15.620 TRIG_00566561 Foreground time interval of the image: -3.736 7.668 (delta_t = 11.404 [sec]) Background time interval of the image: -191.403 -3.736 (delta_t = 187.667 [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 -3.736 sec. to 7.668 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.82701 ( -0.174613 0.167631 ) Norm@50keV : 2.73453E-03 ( -0.00031649 0.000311746 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.25 using 59 PHA bins. # Reduced chi-squared = 1.162 for 57 degrees of freedom # Null hypothesis probability = 1.879386e-01 Photon flux (15-150 keV) in 11.4 sec: 0.380851 ( -0.036812 0.036819 ) ph/cm2/s Energy fluence (15-150 keV) : 2.8681e-07 ( -3.32071e-08 3.38793e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.736 sec. to 7.668 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.339121 ( -0.876316 1.10143 ) Epeak [keV] : 46.2201 ( -6.87421 12.8199 ) Norm@50keV : 1.96872E-02 ( -0.0196876 0.0674123 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.66 using 59 PHA bins. # Reduced chi-squared = 1.012 for 56 degrees of freedom # Null hypothesis probability = 4.501923e-01 Photon flux (15-150 keV) in 11.4 sec: 0.360904 ( -0.037938 0.038227 ) ph/cm2/s Energy fluence (15-150 keV) : 2.48219e-07 ( -3.42678e-08 3.78592e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.168 sec. to 1.168 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.66713 ( -0.207387 0.201261 ) Norm@50keV : 7.66239E-03 ( -0.00109494 0.00108163 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.14 using 59 PHA bins. # Reduced chi-squared = 0.8972 for 57 degrees of freedom # Null hypothesis probability = 6.934386e-01 Photon flux (15-150 keV) in 1 sec: 1.00627 ( -0.128144 0.12817 ) ph/cm2/s Energy fluence (15-150 keV) : 7.11656e-08 ( -1.06385e-08 1.08639e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.168 sec. to 1.168 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.22526 ( -1.06015 1.37127 ) Epeak [keV] : 48.8745 ( -7.91197 14.8456 ) Norm@50keV : 9.52014E-02 ( -0.0952072 0.518322 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 40.21 using 59 PHA bins. # Reduced chi-squared = 0.7181 for 56 degrees of freedom # Null hypothesis probability = 9.447822e-01 Photon flux (15-150 keV) in 1 sec: 0.959897 ( -0.127699 0.128653 ) ph/cm2/s Energy fluence (15-150 keV) : 6.00441e-08 ( -1.01212e-08 1.13644e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 8.676 sec. Hardness ratio (energy fluence ratio) = 1.12750904788
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.357166e-07 S(50-150 keV) = 1.5109841e-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 = -1.680850985297974E-01, IMY = 1.901583252465348E-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: -191.403390 -3.736000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5254 -40.5341 1.9 42.0 -127.6 2.2358 6.2 1.2 Vela X-1 170.2179 -60.6388 2.4 13.6 -144.1 0.7673 4.8 3.0 Cen X-3 186.5698 -62.8960 6.3 6.5 -167.5 0.3044 1.8 7.9 GX 301-2 256.1112 -37.7130 0.0 42.7 51.8 0.8673 1.3 9.8 4U 1700-377 256.6072 -36.4086 22.8 44.0 51.0 0.3597 0.5 8.3 GX 349+2 96.0356 -43.5905 3.1 58.8 -159.2 4.2809 3.7 ------ UNKNOWN 108.9182 -45.5759 2.6 51.5 -152.0 2.0840 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -3.736000 7.668000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.6201 -40.5451 4.4 42.0 -127.5 0.2204 2.6 4.2 Vela X-1 170.3843 -60.4617 10.1 13.5 -143.3 0.0375 1.1 9.9 Cen X-3 186.6589 -62.9820 0.0 6.5 -168.3 -0.0300 -1.0 12.7 GX 301-2 255.7519 -37.7242 0.0 42.5 51.5 -0.2371 -1.9 13.3 4U 1700-377 256.4225 -36.4049 13.3 43.9 50.8 -0.1272 -0.9 1.3 GX 349+2 165.2777 -66.2933 2.3 16.2 -165.7 0.1750 5.0 ------ UNKNOWN 170.0471 -57.5378 0.7 14.2 -131.5 0.5191 15.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 53.996600 962.628600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5295 -40.5580 0.5 27.8 -132.7 14.8977 21.4 0.2 Vela X-1 170.2891 -60.6877 1.4 3.1 113.3 3.7119 7.9 4.0 Cen X-3 186.7922 -62.9132 7.4 9.8 64.7 0.7420 1.6 9.3 GX 301-2 246.8755 -43.8441 2.6 47.7 43.1 8.4492 4.5 ------ UNKNOWN 206.5598 -32.6169 3.1 35.1 -4.7 2.3620 3.8 ------ UNKNOWN 212.0151 -18.2934 3.6 49.9 -9.3 3.3059 3.2 ------ UNKNOWN 90.9949 -32.4284 2.8 57.5 -165.7 9.4005 4.1 ------ UNKNOWN 202.5565 -15.0719 2.8 49.0 -21.9 4.3918 4.2 ------ UNKNOWN 186.3102 -8.3914 4.3 50.8 -44.4 7.1456 2.7 ------ UNKNOWN 179.1753 -11.0877 3.1 47.0 -53.0 10.4079 3.8 ------ UNKNOWN 147.4923 -19.8866 4.9 41.2 -98.6 6.9112 2.4 ------ UNKNOWN