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: Sun Jan 19 13:40:57 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger371050
======================================================================
Trigger: 00371050 Segment: 000
BAT Trigger Time: 275911752.384 [s; MET]
Trigger Stop: 275911752.64 [s; MET]
UTC: 2009-09-29T10:09:07.257040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 117.704966660118 Dec: -0.632291942744759 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.72
Image Trigger?: NO
Rate S/N Ratio: 13.228756555323 [ if not an image trigger ]
Image S/N Ratio: 7.72
Analysis Position: [ source = BAT ]
RA: 117.704966660118 Dec: -0.632291942744759 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 117.713044181164 Dec: -0.643966824125406 [deg; J2000]
{ 07h 50m 51.1s , -00d 38' 38.3" }
+/- 1.44963718110644 [arcmin] (estimated 90% radius based on SNR)
+/- 0.537050552552147 [arcmin] (formal 1-sigma fit error)
SNR: 17.8956683877583
Angular difference between the analysis and refined position is 0.851791 arcmin
Partial Coding Fraction: 0.6328125 [ including projection effects ]
Duration
T90: 357.3599999547 +/- 7.21101519245917
Measured from: -2.17599999904633
to: 355.183999955654 [s; relative to TRIGTIME]
T50: 231.531999945641 +/- 5.56849786219573
Measured from: 19.2919999957085
to: 250.823999941349 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 30.6719999909401
to: 31.6719999909401 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.783999979496
to: 370.899999976158 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.426444 3.843175 2.349209 0.420361
0.116002 0.124157 0.119094 0.130521 [error]
Peak 0.062107 0.150384 0.148835 0.050049
0.007172 0.008486 0.008577 0.007837 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 380.684 -9.784 370.900
T90 357.360 -2.176 355.184
T50 231.532 19.292 250.824
Peak 1.000 30.672 31.672
====== 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 -1.811 -0.085 0.084 - - - 1.66e-03 -7.58e-05 7.52e-05 54.060 57
CPL -1.639 -0.239 0.343 98.106 -42.192 -98.106 2.04e-03 -4.42e-04 1.01e-03 53.220 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 -0.928 -0.107 0.109 - - - 2.82e-02 -1.76e-03 1.76e-03 51.370 57
CPL -0.609 -0.361 0.450 246.371 N/A N/A 3.94e-02 N/A N/A 49.600 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 1.08e-06 1.64e-06 1.87e-06 4.08e-06 5.82e-06 8.68e-06 erg/cm2
90%_error_low -7.65e-08 -6.82e-08 -1.21e-07 -5.40e-07 -2.70e-07 -6.40e-07 erg/cm2
90%_error_hi 7.85e-08 6.81e-08 1.21e-07 5.97e-07 2.72e-07 6.85e-07 erg/cm2
Peak flux PL 6.72e-01 9.52e-01 1.00e+00 1.94e+00 3.23e+00 4.57e+00 ph/cm2/s
90%_error_low -8.44e-02 -7.47e-02 -6.70e-02 -2.68e-01 -2.03e-01 -3.19e-01 ph/cm2/s
90%_error_hi 8.81e-02 7.39e-02 6.67e-02 2.96e-01 2.03e-01 3.27e-01 ph/cm2/s
Fluence CPL 1.05e-06 1.67e-06 1.88e-06 3.04e-06 5.70e-06 7.63e-06 erg/cm2
90%_error_low -9.37e-08 -8.09e-08 -1.24e-07 -1.22e-06 -3.39e-07 -1.29e-06 erg/cm2
90%_error_hi 9.49e-08 8.22e-08 1.24e-07 1.19e-06 3.35e-07 1.29e-06 erg/cm2
Peak flux CPL 6.22e-01 9.72e-01 1.04e+00 1.38e+00 3.20e+00 4.02e+00 ph/cm2/s
90%_error_low -1.04e-01 -8.04e-02 -8.26e-02 -4.67e-01 -2.08e-01 -5.08e-01 ph/cm2/s
90%_error_hi 1.08e-01 8.16e-02 8.38e-02 6.57e-01 2.08e-01 7.10e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 117.7130 -0.6440 0.0107 35.1914 177.4639 1.2499684 17.896 TRIG_00371050 Foreground time interval of the image: -9.784 10.317 (delta_t = 20.101 [sec]) Background time interval of the image: -239.384 -9.784 (delta_t = 229.600 [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 -9.784 sec. to 370.900 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.81146 ( -0.0846202 0.0835448 ) Norm@50keV : 1.65979E-03 ( -7.57546e-05 7.5212e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.06 using 59 PHA bins. # Reduced chi-squared = 0.9484 for 57 degrees of freedom # Null hypothesis probability = 5.860944e-01 Photon flux (15-150 keV) in 380.7 sec: 0.229751 ( -0.009766 0.009802 ) ph/cm2/s Energy fluence (15-150 keV) : 5.81584e-06 ( -2.70184e-07 2.72416e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.784 sec. to 370.900 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.63939 ( -0.239208 0.342516 ) Epeak [keV] : 98.1065 ( -42.1925 -98.1065 ) Norm@50keV : 2.04064E-03 ( -0.000442327 0.00101317 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.22 using 59 PHA bins. # Reduced chi-squared = 0.9504 for 56 degrees of freedom # Null hypothesis probability = 5.806394e-01 Photon flux (15-150 keV) in 380.7 sec: 0.226791 ( -0.011139 0.011133 ) ph/cm2/s Energy fluence (15-150 keV) : 5.70311e-06 ( -3.38569e-07 3.353e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 30.672 sec. to 31.672 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.927844 ( -0.106502 0.10859 ) Norm@50keV : 2.81702E-02 ( -0.00176276 0.00175641 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.37 using 59 PHA bins. # Reduced chi-squared = 0.9012 for 57 degrees of freedom # Null hypothesis probability = 6.854688e-01 Photon flux (15-150 keV) in 1 sec: 3.23461 ( -0.2032 0.20337 ) ph/cm2/s Energy fluence (15-150 keV) : 3.12817e-07 ( -2.12288e-08 2.13396e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 30.672 sec. to 31.672 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.608756 ( -0.361493 0.450157 ) Epeak [keV] : 246.371 ( ) Norm@50keV : 3.93678E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.60 using 59 PHA bins. # Reduced chi-squared = 0.8858 for 56 degrees of freedom # Null hypothesis probability = 7.140665e-01 Photon flux (15-150 keV) in 1 sec: 3.19897 ( -0.20847 0.2084 ) ph/cm2/s Energy fluence (15-150 keV) : 3.07496e-07 ( -2.27353e-08 2.25618e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 357.36 sec. Hardness ratio (energy fluence ratio) = 1.13964605989
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.726262e-06 S(50-150 keV) = 3.089612e-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 = -7.045059061514984E-01, IMY = -3.120472534188393E-02
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: -239.384000 -9.784000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5256 -40.5440 0.9 9.2 32.3 2.6433 13.1 0.7 Vela X-1 170.6282 -60.5797 26.0 37.1 2.7 -0.1385 -0.4 9.6 Cen X-3 186.6437 -62.8139 3.2 44.8 0.2 1.4130 3.6 2.6 GX 301-2 114.8414 23.6798 3.7 58.6 -172.4 3.8817 3.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -9.784000 10.316600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5579 -40.4923 3.1 9.2 32.2 -0.1987 -3.7 4.0 Vela X-1 170.4466 -60.7951 7.5 37.1 3.1 -0.1188 -1.5 11.0 Cen X-3 186.8838 -62.9159 355.2 44.9 0.3 0.0030 0.0 10.7 GX 301-2 90.6696 -5.0448 2.1 49.9 142.6 1.5065 5.6 ------ UNKNOWN 117.7130 -0.6440 0.6 35.2 177.5 1.2500 17.9 ------ UNKNOWN 121.2575 -3.4014 2.7 31.2 -179.0 0.2552 4.2 ------ UNKNOWN 200.5339 -53.0743 2.2 50.5 -14.3 0.6022 5.2 ------ UNKNOWN 203.3233 -49.7449 2.9 52.5 -18.4 0.5464 4.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 72.516600 191.516620 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.5986 21.9765 11.5 40.2 124.1 0.4061 1.0 3.0 Crab 135.6917 -40.3856 0.0 43.0 -22.5 0.6685 3.1 12.6 Vela X-1 100.5055 -50.5249 2.2 52.0 11.5 2.3573 5.4 ------ UNKNOWN 107.7151 -6.8862 2.4 11.7 55.4 0.6040 4.9 ------ UNKNOWN 117.7040 -0.6437 1.2 0.0 -96.1 1.2430 9.4 ------ UNKNOWN 154.9189 -5.1928 3.0 37.5 -84.6 1.4973 3.9 ------ UNKNOWN