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 18:04:51 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger508161
======================================================================
Trigger: 00508161 Segment: 000
BAT Trigger Time: 343585592.232 [s; MET]
Trigger Stop: 343585592.296 [s; MET]
UTC: 2011-11-21T16:26:24.635300 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 154.75137632177 Dec: -46.6373700839271 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.2
Image Trigger?: NO
Rate S/N Ratio: 143.013985330107 [ if not an image trigger ]
Image S/N Ratio: 10.2
Analysis Position: [ source = BAT ]
RA: 154.75137632177 Dec: -46.6373700839271 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 154.747083158222 Dec: -46.6695619306296 [deg; J2000]
{ 10h 18m 59.3s , -46d 40' 10.4" }
+/- 1.02330528498326 [arcmin] (estimated 90% radius based on SNR)
+/- 0.389160082570012 [arcmin] (formal 1-sigma fit error)
SNR: 29.4323685256761
Angular difference between the analysis and refined position is 1.939587 arcmin
Partial Coding Fraction: 0.6484375 [ including projection effects ]
Duration
T90: 113.331999957561 +/- 20.4203071641694
Measured from: -0.0239999890327454
to: 113.307999968529 [s; relative to TRIGTIME]
T50: 50.8559999465942 +/- 4.19975805567008
Measured from: 0.532000005245209
to: 51.3879999518394 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.263999998569489
to: 0.736000001430511 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.335999965667725
to: 138.263999998569 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.025312 1.305022 0.964845 0.303551
0.070675 0.071650 0.063293 0.055761 [error]
Peak 0.146713 0.273280 0.355665 0.148845
0.010256 0.012880 0.014334 0.013484 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 138.600 -0.336 138.264
T90 113.332 -0.024 113.308
T50 50.856 0.532 51.388
Peak 1.000 -0.264 0.736
====== 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: 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 -1.607 -0.115 0.114 - - - 1.66e-03 -1.06e-04 1.05e-04 74.700 57
CPL -1.607 -0.115 0.380 9999.160 -9999.160 -9999.160 1.66e-03 -3.23e-04 8.90e-04 74.700 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 -0.949 -0.082 0.082 - - - 6.21e-02 -2.91e-03 2.91e-03 39.620 57
CPL -0.600 -0.316 0.352 234.014 -88.397 1562.416 8.84e-02 -2.34e-02 3.62e-02 36.230 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 3.24e-07 5.58e-07 7.32e-07 1.95e-06 2.14e-06 3.57e-06 erg/cm2
90%_error_low -3.42e-08 -3.56e-08 -6.28e-08 -3.40e-07 -1.47e-07 -3.92e-07 erg/cm2
90%_error_hi 3.53e-08 3.55e-08 6.27e-08 3.88e-07 1.48e-07 4.30e-07 erg/cm2
Peak flux PL 1.51e+00 2.12e+00 2.19e+00 4.16e+00 7.14e+00 9.98e+00 ph/cm2/s
90%_error_low -1.43e-01 -1.23e-01 -1.13e-01 -4.50e-01 -3.37e-01 -5.31e-01 ph/cm2/s
90%_error_hi 1.48e-01 1.22e-01 1.12e-01 4.84e-01 3.37e-01 5.42e-01 ph/cm2/s
Fluence CPL 3.25e-07 5.56e-07 7.31e-07 2.03e-06 2.15e-06 3.57e-06 erg/cm2
90%_error_low N/A -3.57e-08 -6.84e-08 -9.62e-07 -1.80e-07 -8.90e-07 erg/cm2
90%_error_hi N/A 3.94e-08 7.26e-08 -1.17e-08 1.16e-07 2.16e-07 erg/cm2
Peak flux CPL 1.38e+00 2.15e+00 2.29e+00 2.96e+00 7.04e+00 8.77e+00 ph/cm2/s
90%_error_low -1.85e-01 -1.31e-01 -1.42e-01 -7.75e-01 -3.49e-01 -8.55e-01 ph/cm2/s
90%_error_hi 1.91e-01 1.32e-01 1.44e-01 1.12e+00 3.48e-01 1.15e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 154.7471 -46.6696 0.0066 38.6099 -166.3973 1.5549440 29.432 TRIG_00508161 Foreground time interval of the image: -0.336 9.069 (delta_t = 9.405 [sec]) Background time interval of the image: -239.232 -0.336 (delta_t = 238.896 [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 -0.336 sec. to 138.264 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.60745 ( -0.115176 0.114128 ) Norm@50keV : 1.65551E-03 ( -0.000105893 0.000105298 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 74.70 using 59 PHA bins. # Reduced chi-squared = 1.310 for 57 degrees of freedom # Null hypothesis probability = 5.791891e-02 Photon flux (15-150 keV) in 138.6 sec: 0.213241 ( -0.01345 0.013483 ) ph/cm2/s Energy fluence (15-150 keV) : 2.14424e-06 ( -1.47353e-07 1.48493e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.336 sec. to 138.264 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.60659 ( -0.115093 0.379947 ) Epeak [keV] : 9999.16 ( -9999.34 -9999.34 ) Norm@50keV : 1.65677E-03 ( -0.000325568 0.000887298 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 74.70 using 59 PHA bins. # Reduced chi-squared = 1.334 for 56 degrees of freedom # Null hypothesis probability = 4.815933e-02 Photon flux (15-150 keV) in 138.6 sec: 0.213683 ( -0.014811 0.013806 ) ph/cm2/s Energy fluence (15-150 keV) : 2.15102e-06 ( -1.79623e-07 1.16097e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.264 sec. to 0.736 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.949054 ( -0.0818155 0.082484 ) Norm@50keV : 6.21250E-02 ( -0.00291275 0.00290782 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 39.62 using 59 PHA bins. # Reduced chi-squared = 0.6951 for 57 degrees of freedom # Null hypothesis probability = 9.613648e-01 Photon flux (15-150 keV) in 1 sec: 7.13728 ( -0.33712 0.33732 ) ph/cm2/s Energy fluence (15-150 keV) : 6.844e-07 ( -3.55564e-08 3.56953e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.264 sec. to 0.736 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.599625 ( -0.315501 0.351818 ) Epeak [keV] : 234.014 ( -88.3968 1562.41 ) Norm@50keV : 8.84438E-02 ( -0.0233821 0.0362069 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 36.23 using 59 PHA bins. # Reduced chi-squared = 0.6470 for 56 degrees of freedom # Null hypothesis probability = 9.813736e-01 Photon flux (15-150 keV) in 1 sec: 7.04200 ( -0.34876 0.34846 ) ph/cm2/s Energy fluence (15-150 keV) : 6.74124e-07 ( -3.74897e-08 3.73352e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
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 = -7.761713841618197E-01, IMY = 1.878141121877681E-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: -239.232000 -0.336000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4808 -40.3779 0.0 40.4 169.7 0.8373 2.7 10.8 Vela X-1 170.3192 -60.6590 1.5 29.6 -141.1 1.7449 7.6 2.2 Cen X-3 186.8512 -62.7061 3.9 31.5 -125.6 0.7697 2.9 6.6 GX 301-2 119.6198 -40.8901 3.1 37.2 151.1 1.1763 3.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.336000 9.068590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5340 -40.5797 4.9 40.2 169.8 -0.1417 -2.3 1.5 Vela X-1 170.1556 -60.7117 58.8 29.5 -141.2 -0.0084 -0.2 7.1 Cen X-3 186.5190 -62.9436 0.0 31.2 -125.6 -0.1146 -2.4 11.1 GX 301-2 47.1910 -86.9108 2.5 11.9 -53.9 0.1702 4.5 ------ UNKNOWN 344.6914 -70.5454 2.3 26.9 -19.8 0.2127 5.1 ------ UNKNOWN 154.7471 -46.6695 0.4 38.6 -166.4 1.5549 29.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 65.868630 962.830400 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4646 -40.5330 3.6 15.2 98.4 1.7530 3.2 3.2 Vela X-1 170.3191 -60.6169 0.7 16.7 -35.7 8.2270 17.4 0.4 Cen X-3 186.7257 -62.7703 2.6 24.1 -44.8 2.3861 4.4 1.9 GX 301-2 110.3046 -38.6678 3.6 33.2 79.2 3.4563 3.2 ------ UNKNOWN 165.2332 8.1567 2.5 55.6 -175.7 8.8782 4.6 ------ UNKNOWN 173.9576 9.9099 3.3 59.1 -166.1 11.2721 3.5 ------ UNKNOWN