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: Mon Jan 13 03:16:28 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger526642
======================================================================
Trigger: 00526642 Segment: 000
BAT Trigger Time: 363993536 [s; MET]
Trigger Stop: 363993600 [s; MET]
UTC: 2012-07-14T21:18:46.573920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 355.432702280664 Dec: -46.1858043791775 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.3
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.3
Analysis Position: [ source = BAT ]
RA: 355.432702280664 Dec: -46.1858043791775 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 355.423600350055 Dec: -46.1957729965436 [deg; J2000]
{ 23h 41m 41.7s , -46d 11' 44.8" }
+/- 1.73190423869308 [arcmin] (estimated 90% radius based on SNR)
+/- 0.632058150241676 [arcmin] (formal 1-sigma fit error)
SNR: 13.8793774623185
Angular difference between the analysis and refined position is 0.707579 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 157.311999976635 +/- 23.9863005360993
Measured from: -14.8080000281334
to: 142.503999948502 [s; relative to TRIGTIME]
T50: 69.5239999890327 +/- 36.6918177621148
Measured from: -2.38800001144409
to: 67.1359999775887 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -21.7080000042915
to: -20.7080000042915 [s; relative to TRIGTIME]
Total Fluence
Measured from: -24.160000026226
to: 151.248000025749 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.556728 0.890469 0.583334 0.032027
0.069249 0.071346 0.062345 0.053216 [error]
Peak 0.019426 0.014266 0.011642 0.001858
0.005322 0.005469 0.004745 0.004165 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 175.408 -24.160 151.248
T90 157.312 -14.808 142.504
T50 69.524 -2.388 67.136
Peak 1.000 -21.708 -20.708
====== 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 -1.529 -0.164 0.162 - - - 7.54e-04 -7.75e-05 7.69e-05 51.990 57
CPL -0.688 -0.684 0.824 71.236 -17.102 101.741 2.16e-03 -1.22e-03 3.86e-03 47.400 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 -1.941 -0.803 0.657 - - - 2.42e-03 -1.19e-03 1.10e-03 54.930 57
CPL -1.937 N/A N/A 250.193 N/A N/A 2.42e-03 N/A N/A 54.940 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 1.74e-07 3.13e-07 4.34e-07 1.25e-06 1.25e-06 2.17e-06 erg/cm2
90%_error_low -2.60e-08 -3.08e-08 -5.83e-08 -3.15e-07 -1.40e-07 -3.73e-07 erg/cm2
90%_error_hi 2.68e-08 3.07e-08 5.84e-08 3.80e-07 1.42e-07 4.26e-07 erg/cm2
Peak flux PL 1.52e-01 1.18e-01 6.16e-02 4.63e-02 3.53e-01 3.78e-01 ph/cm2/s
90%_error_low -6.94e-02 -4.19e-02 -3.64e-02 -4.63e-02 -1.21e-01 -1.34e-01 ph/cm2/s
90%_error_hi 7.29e-02 4.08e-02 3.99e-02 8.07e-02 1.21e-01 1.38e-01 ph/cm2/s
Fluence CPL 1.57e-07 3.46e-07 4.39e-07 3.62e-07 1.15e-06 1.30e-06 erg/cm2
90%_error_low -2.98e-08 -4.07e-08 -6.78e-08 -2.19e-07 -1.58e-07 -2.70e-07 erg/cm2
90%_error_hi 3.01e-08 4.25e-08 6.59e-08 5.91e-07 1.62e-07 5.95e-07 erg/cm2
Peak flux CPL 1.53e-01 1.15e-01 5.97e-02 5.18e-02 3.48e-01 3.82e-01 ph/cm2/s
90%_error_low N/A -6.26e-02 -3.43e-02 -5.18e-02 -1.89e-01 -1.36e-01 ph/cm2/s
90%_error_hi N/A 5.47e-02 2.05e-02 1.69e-02 1.25e-01 1.29e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 355.4236 -46.1958 0.0139 10.7754 106.7815 1.5977091 13.879 TRIG_00526642 Foreground time interval of the image: -24.160 72.501 (delta_t = 96.661 [sec]) Background time interval of the image: -394.799 -379.858 (delta_t = 14.941 [sec]) -239.000 -24.160 (delta_t = 214.840 [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 -24.160 sec. to 151.248 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.52949 ( -0.164338 0.162173 ) Norm@50keV : 7.54213E-04 ( -7.75211e-05 7.68799e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.99 using 59 PHA bins. # Reduced chi-squared = 0.9120 for 57 degrees of freedom # Null hypothesis probability = 6.631963e-01 Photon flux (15-150 keV) in 175.4 sec: 9.49245E-02 ( -0.0091998 0.0092035 ) ph/cm2/s Energy fluence (15-150 keV) : 1.24931e-06 ( -1.40108e-07 1.42053e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -24.160 sec. to 151.248 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.687642 ( -0.683499 0.823933 ) Epeak [keV] : 71.2362 ( -17.1038 101.738 ) Norm@50keV : 2.15951E-03 ( -0.00122209 0.0038585 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.40 using 59 PHA bins. # Reduced chi-squared = 0.8465 for 56 degrees of freedom # Null hypothesis probability = 7.864817e-01 Photon flux (15-150 keV) in 175.4 sec: 9.18931E-02 ( -0.0095226 0.0095219 ) ph/cm2/s Energy fluence (15-150 keV) : 1.14916e-06 ( -1.57665e-07 1.62376e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -21.708 sec. to -20.708 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.94096 ( -0.803314 0.65744 ) Norm@50keV : 2.41851E-03 ( -0.00119053 0.00109948 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.93 using 59 PHA bins. # Reduced chi-squared = 0.9637 for 57 degrees of freedom # Null hypothesis probability = 5.531860e-01 Photon flux (15-150 keV) in 1 sec: 0.353299 ( -0.120505 0.120583 ) ph/cm2/s Energy fluence (15-150 keV) : 2.22546e-08 ( -9.63371e-09 1.06935e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -21.708 sec. to -20.708 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.93736 ( ) Epeak [keV] : 250.193 ( ) Norm@50keV : 2.41945E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.94 using 59 PHA bins. # Reduced chi-squared = 0.9810 for 56 degrees of freedom # Null hypothesis probability = 5.151911e-01 Photon flux (15-150 keV) in 1 sec: 0.347945 ( -0.188945 0.124734 ) ph/cm2/s Energy fluence (15-150 keV) : 2.02484e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 157.312 sec. Hardness ratio (energy fluence ratio) = 1.38560635236
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.870676e-07 S(50-150 keV) = 7.622414e-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 = -5.494803448911557E-02, IMY = -1.822095744744837E-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: -394.799390 -379.858100 -239.000000 -24.160000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 316.3440 -38.7086 2.4 38.9 81.6 3.6680 4.8 ------ UNKNOWN 7.9791 -3.5970 2.1 47.7 171.7 2.1680 5.5 524.9 UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -24.160000 72.500600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 290.9333 -53.8374 2.6 45.5 48.5 2.3690 4.4 ------ UNKNOWN 355.4236 -46.1958 0.8 10.8 106.8 1.5977 13.9 ------ UNKNOWN 64.0563 -45.0636 2.2 35.8 -83.9 1.2758 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 108.700600 166.300600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 275.5987 -69.3635 3.1 44.1 24.9 0.5831 3.7 ------ UNKNOWN 326.0847 -61.1066 2.2 22.6 33.1 0.4418 5.3 ------ UNKNOWN 111.3841 -72.1484 2.6 53.6 -25.0 1.0720 4.4 ------ UNKNOWN 66.6312 -52.2193 2.6 45.0 -60.1 1.5893 4.5 ------ UNKNOWN