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: Wed Jan 22 21:18:43 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger147478
======================================================================
Trigger: 00147478 Segment: 000
BAT Trigger Time: 143901249 [s; MET]
Trigger Stop: 143901249.064 [s; MET]
UTC: 2005-07-24T12:34:09.361840 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 246.214226784009 Dec: -27.5239717279159 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.77
Image Trigger?: NO
Rate S/N Ratio: 32.832910318764 [ if not an image trigger ]
Image S/N Ratio: 10.77
Analysis Position: [ source = BAT ]
RA: 246.214226784009 Dec: -27.5239717279159 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 246.179863475337 Dec: -27.5253074911614 [deg; J2000]
{ 16h 24m 43.2s , -27d 31' 31.1" }
+/- 1.85612095261176 [arcmin] (estimated 90% radius based on SNR)
+/- 0.955463533104392 [arcmin] (formal 1-sigma fit error)
SNR: 12.5717325264243
Angular difference between the analysis and refined position is 1.830184 arcmin
Partial Coding Fraction: 0.3671875 [ including projection effects ]
Duration
T90: 98.6840000152588 +/- 8.55663207182055
Measured from: 0.0519999861717224
to: 98.7360000014305 [s; relative to TRIGTIME]
T50: 73.8680000007153 +/- 10.9161606717104
Measured from: 1.86000001430511
to: 75.7280000150204 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0239999890327454
to: 0.976000010967255 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0239999890327454
to: 107.139999985695 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.731174 0.728827 0.366425 0.141312
0.073000 0.062626 0.053296 0.047404 [error]
Peak 0.128964 0.137256 0.105923 0.023961
0.011623 0.010839 0.009743 0.007480 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 107.164 -0.024 107.140
T90 98.684 0.052 98.736
T50 73.868 1.860 75.728
Peak 1.000 -0.024 0.976
====== 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 -1.934 -0.212 0.204 - - - 1.02e-03 -1.26e-04 1.23e-04 56.200 57
CPL -2.021 -0.272 0.590 11.479 N/A N/A 9.16e-04 N/A N/A 55.990 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 -1.658 -0.162 0.158 - - - 2.56e-02 -2.32e-03 2.29e-03 55.990 57
CPL -1.578 -0.897 0.576 244.546 N/A N/A 2.81e-02 N/A N/A 56.030 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 2.10e-07 2.97e-07 3.10e-07 5.98e-07 1.01e-06 1.42e-06 erg/cm2
90%_error_low -3.39e-08 -3.03e-08 -5.31e-08 -1.89e-07 -1.19e-07 -2.44e-07 erg/cm2
90%_error_hi 3.53e-08 3.03e-08 5.38e-08 2.42e-07 1.21e-07 2.84e-07 erg/cm2
Peak flux PL 1.23e+00 1.13e+00 7.14e-01 6.93e-01 3.36e+00 3.76e+00 ph/cm2/s
90%_error_low -1.80e-01 -1.02e-01 -8.40e-02 -1.56e-01 -2.95e-01 -3.20e-01 ph/cm2/s
90%_error_hi 1.88e-01 1.01e-01 8.32e-02 1.81e-01 2.96e-01 3.21e-01 ph/cm2/s
Fluence CPL 2.09e-07 2.60e-07 2.77e-07 5.95e-07 8.90e-07 1.40e-06 erg/cm2
90%_error_low -3.57e-08 -7.11e-08 -8.28e-08 -1.70e-07 -3.73e-07 -4.04e-07 erg/cm2
90%_error_hi 3.43e-08 4.35e-08 5.27e-08 1.33e-07 2.17e-07 2.81e-07 erg/cm2
Peak flux CPL 1.22e+00 1.13e+00 7.16e-01 6.60e-01 3.35e+00 3.72e+00 ph/cm2/s
90%_error_low -2.20e-01 -1.04e-01 -8.15e-02 -3.23e-01 -3.12e-01 -4.85e-01 ph/cm2/s
90%_error_hi 1.54e-01 1.15e-01 9.11e-02 1.43e-01 3.02e-01 3.53e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 246.1799 -27.5253 0.0152 33.3010 45.6079 0.6278714 12.572 TRIG_00147478 Foreground time interval of the image: -0.024 8.701 (delta_t = 8.725 [sec]) Background time interval of the image: -186.899 -0.024 (delta_t = 186.875 [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 -0.024 sec. to 107.140 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.93423 ( -0.21244 0.204333 ) Norm@50keV : 1.01934E-03 ( -0.000126117 0.000122932 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.20 using 59 PHA bins. # Reduced chi-squared = 0.9859 for 57 degrees of freedom # Null hypothesis probability = 5.051084e-01 Photon flux (15-150 keV) in 107.2 sec: 0.148468 ( -0.015537 0.015585 ) ph/cm2/s Energy fluence (15-150 keV) : 1.00534e-06 ( -1.18873e-07 1.21035e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 107.140 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.19334 ( -0.0990911 0.762519 ) Epeak [keV] : 78.9097 ( ) Norm@50keV : 7.50321E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.69 using 59 PHA bins. # Reduced chi-squared = 0.9945 for 56 degrees of freedom # Null hypothesis probability = 4.864231e-01 Photon flux (15-150 keV) in 107.2 sec: 0.138851 ( -0.035547 0.024806 ) ph/cm2/s Energy fluence (15-150 keV) : 8.9003e-07 ( -3.73442e-07 2.1686e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.024 sec. to 0.976 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.65765 ( -0.161734 0.15835 ) Norm@50keV : 2.56355E-02 ( -0.00231729 0.00229481 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.99 using 59 PHA bins. # Reduced chi-squared = 0.9822 for 57 degrees of freedom # Null hypothesis probability = 5.130992e-01 Photon flux (15-150 keV) in 1 sec: 3.35598 ( -0.29477 0.29577 ) ph/cm2/s Energy fluence (15-150 keV) : 2.38276e-07 ( -2.27647e-08 2.29943e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 0.976 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.57796 ( -0.879967 0.593296 ) Epeak [keV] : 244.546 ( ) Norm@50keV : 2.80522E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.99 using 59 PHA bins. # Reduced chi-squared = 0.9998 for 56 degrees of freedom # Null hypothesis probability = 4.752437e-01 Photon flux (15-150 keV) in 1 sec: 3.34836 ( -0.31236 0.30183 ) ph/cm2/s Energy fluence (15-150 keV) : 2.37564e-07 ( -2.48922e-08 2.34838e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 98.684 sec. Hardness ratio (energy fluence ratio) = 1.04667039807
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.066765e-07 S(50-150 keV) = 4.986692e-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 = 4.595461485119394E-01, IMY = -4.694024223903498E-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: -186.899400 -0.024000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.4474 -60.4695 6.1 26.2 -142.0 -0.3391 -1.9 10.0 Cen X-3 186.7901 -62.8613 4.6 19.3 -153.0 0.4330 2.5 6.6 GX 301-2 244.9760 -15.6399 0.3 42.7 33.5 18.4538 35.5 0.2 Sco X-1 256.2256 -37.9311 0.0 32.0 70.4 -0.6045 -1.6 12.5 4U 1700-377 256.4131 -36.4783 4.9 33.0 68.5 0.9660 2.4 3.5 GX 349+2 264.5032 -44.4410 46.5 33.8 86.7 -0.1112 -0.2 10.3 4U 1735-44 263.0285 -33.8460 4.4 38.9 70.9 1.9309 2.6 2.1 GX 354-0 266.0883 -34.9208 2.5 40.1 74.7 4.0195 4.7 ------ UNKNOWN 93.5979 -60.2851 4.1 59.4 -163.1 3.8316 2.8 ------ UNKNOWN 151.9694 -40.5317 2.7 43.5 -114.6 3.2449 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.024000 8.700600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.2551 -60.8231 5.1 26.3 -142.8 0.0701 2.3 12.1 Cen X-3 186.5310 -62.8057 11.7 19.4 -152.7 -0.0265 -1.0 4.0 GX 301-2 245.0739 -15.6749 3.3 42.7 33.7 0.2778 3.5 5.8 Sco X-1 255.8512 -37.9829 5.3 31.7 70.2 0.1227 2.2 10.5 4U 1700-377 256.3124 -36.5795 0.0 32.9 68.5 0.0934 1.6 11.1 GX 349+2 264.6701 -44.3724 7.1 33.9 86.7 0.1085 1.6 5.6 4U 1735-44 263.1571 -33.7865 9.6 39.0 70.9 -0.1306 -1.2 8.9 GX 354-0 246.1799 -27.5253 0.9 33.3 45.6 0.6280 12.6 ------ UNKNOWN 200.0554 -27.1795 2.1 25.8 -43.2 0.1617 5.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 62.500630 303.065000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.6857 -62.7305 3.8 51.9 -154.7 2.1969 3.0 2.5 GX 301-2 244.9809 -15.6433 0.1 11.9 -10.7 23.5581 96.1 0.2 Sco X-1 255.8007 -37.7054 11.3 13.0 139.3 0.2618 1.0 12.1 4U 1700-377 256.5420 -36.4436 3.3 12.5 133.4 0.9058 3.5 5.3 GX 349+2 262.8361 -24.6064 0.0 15.2 77.9 -0.3120 -1.2 12.6 GX 1+4 264.6613 -44.4744 6.5 22.5 139.0 0.5109 1.8 3.8 4U 1735-44 268.3720 -1.4676 1.8 33.6 38.1 2.6984 6.5 0.9 SW J1753.5-0127 270.2497 -24.9876 2.7 21.7 83.9 1.2591 4.2 5.8 GX 5-1 270.2970 -25.7805 2.3 21.5 86.1 1.4936 5.0 2.3 GRS 1758-258 274.1682 -14.1027 5.8 29.2 63.6 0.8209 2.0 10.3 GX 17+2 275.8812 -30.5117 8.2 26.0 98.9 0.5435 1.4 9.0 H1820-303 285.1172 -24.8848 20.2 34.8 89.9 0.3611 0.6 4.9 HT1900.1-2455 262.9803 -33.8293 169.3 15.7 113.0 0.0187 0.1 0.5 GX 354-0 250.5588 29.3055 3.8 57.0 -0.4 4.6772 3.0 ------ UNKNOWN