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 20 11:14:34 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger263361
======================================================================
Trigger: 00263361 Segment: 000
BAT Trigger Time: 194892089.984 [s; MET]
Trigger Stop: 194892102.144 [s; MET]
UTC: 2007-03-06T16:41:28.177300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 148.081830318346 Dec: 10.4713881166989 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.85
Image Trigger?: NO
Rate S/N Ratio: 13.3041346956501 [ if not an image trigger ]
Image S/N Ratio: 9.85
Analysis Position: [ source = BAT ]
RA: 148.081830318346 Dec: 10.4713881166989 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 148.082 Dec: 10.4714 [deg; J2000]
{ 09h 52m 19.7s , +10d 28' 17.0" }
+/- 1.86583816617 [arcmin] (estimated 90% radius based on SNR)
SNR: 12.4799366243
Angular difference between the analysis and refined position is 0.010037 arcmin
Partial Coding Fraction: 0.2851562 [ including projection effects ]
Duration
T90: 209.243999987841 +/- 64.6099401058841
Measured from: -61.6999999880791
to: 147.543999999762 [s; relative to TRIGTIME]
T50: 21.9160000085831 +/- 41.1730326057894
Measured from: 83.8479999899864
to: 105.763999998569 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 98.2680000066757
to: 99.2680000066757 [s; relative to TRIGTIME]
Total Fluence
Measured from: -118.840000003576
to: 185.256000012159 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.795082 3.514344 2.287480 0.560661
0.133614 0.139057 0.121328 0.104181 [error]
Peak 0.140420 0.183699 0.142982 0.023604
0.007149 0.008023 0.007169 0.005038 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 304.096 -118.840 185.256
T90 209.244 -61.700 147.544
T50 21.916 83.848 105.764
Peak 1.000 98.268 99.268
====== 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 -1.627 -0.090 0.089 - - - 1.92e-03 -9.41e-05 9.37e-05 55.130 57
CPL -1.604 -0.113 0.237 861.181 -861.181 -861.181 1.98e-03 -1.43e-04 4.10e-05 55.270 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 -1.541 -0.088 0.087 - - - 3.22e-02 -1.63e-03 1.62e-03 29.980 57
CPL -1.188 -0.340 0.368 116.731 -35.935 875.570 4.83e-02 -1.52e-02 2.46e-02 26.820 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 8.42e-07 1.43e-06 1.85e-06 4.85e-06 5.46e-06 8.98e-06 erg/cm2
90%_error_low -6.97e-08 -7.03e-08 -1.22e-07 -6.66e-07 -2.86e-07 -7.62e-07 erg/cm2
90%_error_hi 7.15e-08 7.01e-08 1.22e-07 7.38e-07 2.88e-07 8.20e-07 erg/cm2
Peak flux PL 1.38e+00 1.35e+00 9.30e-01 1.01e+00 4.06e+00 4.67e+00 ph/cm2/s
90%_error_low -1.17e-01 -7.09e-02 -5.97e-02 -1.28e-01 -2.03e-01 -2.30e-01 ph/cm2/s
90%_error_hi 1.20e-01 7.06e-02 5.94e-02 1.38e-01 2.04e-01 2.31e-01 ph/cm2/s
Fluence CPL 8.42e-07 1.43e-06 1.85e-06 4.83e-06 5.46e-06 9.01e-06 erg/cm2
90%_error_low N/A N/A N/A N/A -2.54e-07 -1.76e-06 erg/cm2
90%_error_hi N/A N/A N/A N/A 2.87e-07 3.56e-07 erg/cm2
Peak flux CPL 1.29e+00 1.39e+00 9.58e-01 6.80e-01 3.99e+00 4.32e+00 ph/cm2/s
90%_error_low -1.44e-01 -8.11e-02 -6.62e-02 -2.08e-01 -2.15e-01 -3.13e-01 ph/cm2/s
90%_error_hi 1.47e-01 8.23e-02 6.72e-02 3.18e-01 2.15e-01 3.81e-01 ph/cm2/s
======================================================================
Image
Pre-slew 25.0-100.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 148.082 10.471 0.000 33.013 106.315 0.581 12.480 TRIG_00263361 Image time interval: 0.000 to 12.160 [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 -118.840 sec. to 185.256 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.62699 ( -0.0899041 0.089352 ) Norm@50keV : 1.92461E-03 ( -9.41208e-05 9.37225e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.13 using 59 PHA bins. # Reduced chi-squared = 0.9672 for 57 degrees of freedom # Null hypothesis probability = 5.456263e-01 Photon flux (15-150 keV) in 304.1 sec: 0.249443 ( -0.012142 0.012174 ) ph/cm2/s Energy fluence (15-150 keV) : 5.45729e-06 ( -2.85908e-07 2.87533e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -118.840 sec. to 185.256 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.62522 ( -0.11256 0.237909 ) Epeak [keV] : 1.00000E+04 ( -10000 -10000 ) Norm@50keV : 1.92885E-03 ( -9.45512e-05 8.98797e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.14 using 59 PHA bins. # Reduced chi-squared = 0.9846 for 56 degrees of freedom # Null hypothesis probability = 5.074643e-01 Photon flux (15-150 keV) in 304.1 sec: 0.250493 ( -0.017141 0.014889 ) ph/cm2/s Energy fluence (15-150 keV) : 5.45616e-06 ( -2.54209e-07 2.87467e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 98.268 sec. to 99.268 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.54116 ( -0.0882144 0.0873864 ) Norm@50keV : 3.21882E-02 ( -0.00162551 0.00162026 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 29.98 using 59 PHA bins. # Reduced chi-squared = 0.5260 for 57 degrees of freedom # Null hypothesis probability = 9.987908e-01 Photon flux (15-150 keV) in 1 sec: 4.06460 ( -0.20345 0.20367 ) ph/cm2/s Energy fluence (15-150 keV) : 3.03452e-07 ( -1.66911e-08 1.67839e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 98.268 sec. to 99.268 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.18761 ( -0.34023 0.367939 ) Epeak [keV] : 116.731 ( -35.9351 875.57 ) Norm@50keV : 4.82611E-02 ( -0.0152385 0.0245657 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 26.82 using 59 PHA bins. # Reduced chi-squared = 0.4790 for 56 degrees of freedom # Null hypothesis probability = 9.996682e-01 Photon flux (15-150 keV) in 1 sec: 3.99133 ( -0.21492 0.21492 ) ph/cm2/s Energy fluence (15-150 keV) : 2.01034e-07 ( -1.64815e-08 1.31811e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 209.244 sec. Hardness ratio (energy fluence ratio) = 1.29509057679
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.2738875e-06 S(50-150 keV) = 3.183356e-06
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 = -0.182518282055, IMY = -0.623577896889
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: -239.984000 -118.840000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 104.5188 9.1753 2.5 54.4 162.8 2.3386 4.6 ------ UNKNOWN 188.5642 43.4297 2.3 25.4 -6.3 0.5187 4.9 ------ UNKNOWN 210.9770 41.2651 2.6 41.8 -11.4 0.6883 4.5 ------ UNKNOWN 110.9201 43.5115 2.9 30.6 -157.8 0.4698 4.0 ------ UNKNOWN 217.6970 62.3812 2.7 41.1 -44.1 0.7989 4.2 ------ UNKNOWN 92.7101 75.5654 3.6 41.3 -102.7 1.6746 3.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -118.840000 59.116590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 148.1438 10.4432 1.7 33.0 106.2 2.2801 6.7 ------ UNKNOWN 163.5123 32.2348 2.5 13.5 57.3 0.8419 4.7 ------ UNKNOWN 144.6906 61.8465 2.3 19.4 -96.0 1.0974 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 140.916590 864.816600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5891 -40.5244 8.4 52.3 178.9 1.4626 1.4 3.3 Vela X-1 150.6606 -4.6395 2.9 15.4 157.0 1.2084 4.0 ------ UNKNOWN