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 17:48:23 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger508712
======================================================================
Trigger: 00508712 Segment: 000
BAT Trigger Time: 344276301.952 [s; MET]
Trigger Stop: 344276304 [s; MET]
UTC: 2011-11-29T16:18:14.327920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 307.440815849486 Dec: -52.7242285825363 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.34
Image Trigger?: NO
Rate S/N Ratio: 10.1980390271856 [ if not an image trigger ]
Image S/N Ratio: 7.34
Analysis Position: [ source = BAT ]
RA: 307.440815849486 Dec: -52.7242285825363 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 307.420516393819 Dec: -52.7191723381538 [deg; J2000]
{ 20h 29m 40.9s , -52d 43' 09.0" }
+/- 2.11721533624764 [arcmin] (estimated 90% radius based on SNR)
+/- 0.903732800432064 [arcmin] (formal 1-sigma fit error)
SNR: 10.4169304371238
Angular difference between the analysis and refined position is 0.797651 arcmin
Partial Coding Fraction: 0.6171875 [ including projection effects ]
Duration
T90: 8.47599995136261 +/- 1.27769322915974
Measured from: -6.06400001049042
to: 2.41199994087219 [s; relative to TRIGTIME]
T50: 5.59599995613098 +/- 1.31848395718509
Measured from: -4.39200001955032
to: 1.20399993658066 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.412000000476837
to: 1.41200000047684 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.29199999570847
to: 2.69199997186661 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.181994 0.150243 0.053502 0.002074
0.022154 0.022136 0.019174 0.016243 [error]
Peak 0.045407 0.036362 0.017918 -0.006647
0.008071 0.007668 0.006548 0.005430 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 8.984 -6.292 2.692
T90 8.476 -6.064 2.412
T50 5.596 -4.392 1.204
Peak 1.000 0.412 1.412
====== 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 -2.527 -0.400 0.346 - - - 2.01e-03 -5.79e-04 5.77e-04 37.710 57
CPL -1.909 N/A N/A 5.010 N/A N/A 5.10e-03 N/A N/A 37.850 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 -2.323 -0.523 0.433 - - - 5.22e-03 -1.80e-03 1.71e-03 56.360 57
CPL -1.935 N/A N/A 6.759 N/A N/A 8.85e-03 N/A N/A 56.230 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 6.12e-08 6.06e-08 4.21e-08 4.61e-08 1.82e-07 2.10e-07 erg/cm2
90%_error_low -1.19e-08 -1.19e-08 -1.54e-08 -2.55e-08 -3.73e-08 -5.21e-08 erg/cm2
90%_error_hi 1.20e-08 1.14e-08 1.74e-08 4.23e-08 3.95e-08 6.46e-08 erg/cm2
Peak flux PL 4.76e-01 2.96e-01 1.18e-01 6.38e-02 9.24e-01 9.55e-01 ph/cm2/s
90%_error_low -1.35e-01 -6.92e-02 -5.06e-02 -3.99e-02 -2.01e-01 -2.09e-01 ph/cm2/s
90%_error_hi 1.41e-01 6.74e-02 5.45e-02 6.70e-02 2.01e-01 2.10e-01 ph/cm2/s
Fluence CPL 5.86e-08 6.39e-08 3.70e-08 1.24e-08 1.72e-07 1.75e-07 erg/cm2
90%_error_low -9.81e-09 -9.58e-09 -1.85e-08 -1.05e-08 -4.09e-08 N/A erg/cm2
90%_error_hi 1.04e-08 1.16e-08 2.12e-08 4.60e-08 4.22e-08 N/A erg/cm2
Peak flux CPL 4.62e-01 3.10e-01 1.17e-01 N/A 9.13e-01 9.26e-01 ph/cm2/s
90%_error_low -1.47e-01 N/A -5.68e-02 -3.99e-02 -2.03e-01 N/A ph/cm2/s
90%_error_hi 1.34e-01 N/A 5.70e-02 6.70e-02 1.99e-01 N/A ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 307.4205 -52.7192 0.0184 33.8014 -40.0427 0.4249547 10.417 TRIG_00508712 Foreground time interval of the image: -6.292 2.692 (delta_t = 8.984 [sec]) Background time interval of the image: -400.551 -382.303 (delta_t = 18.248 [sec]) -239.952 -6.292 (delta_t = 233.660 [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 -6.292 sec. to 2.692 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.52721 ( -0.399758 0.346219 ) Norm@50keV : 2.01380E-03 ( -0.000579231 0.000577113 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.71 using 59 PHA bins. # Reduced chi-squared = 0.6616 for 57 degrees of freedom # Null hypothesis probability = 9.771899e-01 Photon flux (15-150 keV) in 8.984 sec: 0.402355 ( -0.064494 0.064496 ) ph/cm2/s Energy fluence (15-150 keV) : 1.82314e-07 ( -3.73035e-08 3.94901e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.292 sec. to 2.692 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.90897 ( ) Epeak [keV] : 5.01012 ( ) Norm@50keV : 5.09712E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.85 using 59 PHA bins. # Reduced chi-squared = 0.6760 for 56 degrees of freedom # Null hypothesis probability = 9.699769e-01 Photon flux (15-150 keV) in 8.984 sec: 0.394414 ( -0.062302 0.064626 ) ph/cm2/s Energy fluence (15-150 keV) : 1.71744e-07 ( -4.08736e-08 4.22199e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.412 sec. to 1.412 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.32264 ( -0.523375 0.432614 ) Norm@50keV : 5.21793E-03 ( -0.00180037 0.00171411 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.36 using 59 PHA bins. # Reduced chi-squared = 0.9888 for 57 degrees of freedom # Null hypothesis probability = 4.990420e-01 Photon flux (15-150 keV) in 1 sec: 0.923609 ( -0.200894 0.200891 ) ph/cm2/s Energy fluence (15-150 keV) : 5.00876e-08 ( -1.33568e-08 1.40762e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.412 sec. to 1.412 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.93538 ( ) Epeak [keV] : 6.75855 ( ) Norm@50keV : 8.84567E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.23 using 59 PHA bins. # Reduced chi-squared = 1.004 for 56 degrees of freedom # Null hypothesis probability = 4.661611e-01 Photon flux (15-150 keV) in 1 sec: 0.913280 ( -0.202868 0.19889 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 8.476 sec. Hardness ratio (energy fluence ratio) = 0.693936914331
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.2187368e-07 S(50-150 keV) = 6.0439e-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 = 5.125278822604804E-01, IMY = 4.307130417598712E-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: -400.551400 -382.303200 -239.952000 -6.292000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.4378 -60.5787 4.8 46.4 -144.0 1.1069 2.4 4.5 Cen X-3 186.5930 -62.8049 1.6 45.1 -133.0 3.7224 7.3 2.7 GX 301-2 350.5340 -43.3839 2.8 30.8 17.2 0.9121 4.0 ------ UNKNOWN 7.6431 -58.7257 2.1 13.5 37.4 1.0183 5.6 ------ UNKNOWN 125.6891 -47.4216 3.0 51.5 178.3 2.1443 3.9 ------ UNKNOWN 325.3922 -29.3352 3.0 49.9 -7.0 1.6412 3.9 ------ UNKNOWN 290.4424 -67.3939 3.0 27.0 -70.9 0.9566 3.8 ------ UNKNOWN 311.2988 -32.2895 2.3 51.1 -23.1 2.4932 4.9 ------ UNKNOWN 239.3947 -63.3524 4.4 41.2 -99.3 2.9056 2.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -6.292000 2.692000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.1862 -60.7035 24.8 46.3 -144.1 -0.0329 -0.5 6.1 Cen X-3 186.6574 -62.8694 16.8 45.1 -133.0 -0.0556 -0.7 5.9 GX 301-2 103.8518 -76.6608 2.5 22.3 -165.8 0.1403 4.6 ------ UNKNOWN 307.4205 -52.7192 1.1 33.8 -40.0 0.4250 10.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 76.148590 748.848590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.6200 -62.7770 1.4 55.6 -159.9 12.7296 8.1 1.1 GX 301-2 256.0527 -37.9995 45.8 38.1 -96.7 0.3390 0.3 9.8 4U 1700-377 256.2363 -36.3717 8.8 39.0 -94.5 2.5608 1.3 10.1 GX 349+2 264.7946 -44.4563 8.3 28.9 -99.1 0.8784 1.4 2.2 4U 1735-44 270.1551 -25.0515 68.6 39.4 -68.4 0.1904 0.2 7.2 GX 5-1 270.4279 -25.8360 93.1 38.6 -68.8 0.1222 0.1 8.8 GRS 1758-258 275.7288 -30.3803 23.1 32.1 -66.9 0.3044 0.5 10.2 H1820-303 284.9094 -24.8379 7.4 32.7 -48.5 -0.8299 -1.6 8.5 HT1900.1-2455 263.1157 -33.7662 7.6 36.7 -85.1 -1.7124 -1.5 7.5 GX 354-0 320.6722 -42.4199 3.4 13.6 37.6 1.3384 3.4 ------ UNKNOWN 263.5616 -76.4721 2.3 28.9 -168.7 1.9750 5.0 ------ UNKNOWN 306.0356 -2.6744 2.6 50.1 -10.2 3.4519 4.4 ------ UNKNOWN 304.1700 -0.6991 3.6 52.1 -12.5 3.1612 3.2 ------ UNKNOWN 172.7708 -62.8326 3.4 59.1 -166.1 9.5990 3.4 ------ UNKNOWN 249.0092 -54.7842 3.0 33.6 -125.8 2.1067 3.9 ------ UNKNOWN 251.6929 -37.3769 5.2 41.1 -99.4 5.5559 2.2 ------ UNKNOWN