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 12 22:43:53 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger541200
======================================================================
Trigger: 00541200 Segment: 000
BAT Trigger Time: 376926432.768 [s; MET]
Trigger Stop: 376926434.816 [s; MET]
UTC: 2012-12-11T13:47:02.795260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 195.544262597769 Dec: 30.1610171473832 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.59
Image Trigger?: NO
Rate S/N Ratio: 13.4536240470737 [ if not an image trigger ]
Image S/N Ratio: 7.59
Analysis Position: [ source = BAT ]
RA: 195.544262597769 Dec: 30.1610171473832 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 195.544 Dec: 30.161 [deg; J2000]
{ 13h 02m 10.6s , +30d 09' 39.6" }
+/- 2.50185808081 [arcmin] (estimated 90% radius based on SNR)
SNR: 8.20783326529
Angular difference between the analysis and refined position is 0.013662 arcmin
Partial Coding Fraction: 0.2285156 [ including projection effects ]
Duration
T90: 182.695999920368 +/- 38.7314644051461
Measured from: 1
to: 183.695999920368 [s; relative to TRIGTIME]
T50: 47.6279999613762 +/- 23.898011380813
Measured from: 120.727999985218
to: 168.355999946594 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.06800001859665
to: 2.06800001859665 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.356000006198883
to: 196.772000014782 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.176068 1.080575 0.422906 0.053919
0.104108 0.106804 0.092874 0.081457 [error]
Peak 0.027647 0.042056 0.055976 0.023343
0.013240 0.013189 0.012544 0.010036 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 197.128 -0.356 196.772
T90 182.696 1.000 183.696
T50 47.628 120.728 168.356
Peak 1.000 1.068 2.068
====== 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 -2.263 -0.266 0.243 - - - 6.76e-04 -1.23e-04 1.20e-04 55.160 57
CPL -2.475 -0.280 0.893 182.006 N/A N/A 5.21e-04 N/A N/A 54.880 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 -0.944 -0.509 0.605 - - - 8.91e-03 -2.81e-03 2.63e-03 38.460 57
CPL -0.867 -1.348 -1.142 827.540 N/A N/A 9.69e-03 N/A N/A 38.510 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 3.50e-07 4.06e-07 3.38e-07 4.75e-07 1.27e-06 1.57e-06 erg/cm2
90%_error_low -5.26e-08 -5.06e-08 -8.23e-08 -1.92e-07 -1.85e-07 -3.05e-07 erg/cm2
90%_error_hi 5.35e-08 4.96e-08 8.69e-08 2.67e-07 1.92e-07 3.63e-07 erg/cm2
Peak flux PL 2.16e-01 3.03e-01 3.15e-01 6.01e-01 1.02e+00 1.43e+00 ph/cm2/s
90%_error_low -1.26e-01 -1.26e-01 -9.07e-02 -3.11e-01 -3.11e-01 -4.13e-01 ph/cm2/s
90%_error_hi 1.61e-01 1.20e-01 8.94e-02 5.13e-01 3.16e-01 4.48e-01 ph/cm2/s
Fluence CPL 3.47e-07 3.70e-07 2.92e-07 4.63e-07 1.16e-06 1.47e-06 erg/cm2
90%_error_low -5.71e-08 -1.28e-07 -1.65e-07 -3.45e-07 -4.19e-07 -6.56e-07 erg/cm2
90%_error_hi 5.59e-08 7.87e-08 1.32e-07 3.84e-07 3.03e-07 5.67e-07 erg/cm2
Peak flux CPL 2.27e-01 3.00e-01 3.08e-01 6.88e-01 1.03e+00 1.54e+00 ph/cm2/s
90%_error_low N/A N/A -9.50e-02 N/A -3.57e-01 -8.11e-01 ph/cm2/s
90%_error_hi N/A N/A 1.27e-01 N/A 3.43e-01 4.60e-01 ph/cm2/s
======================================================================
Image
Pre-slew 25.0-100.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 195.544 30.161 0.000 33.426 87.274 0.221 8.208 TRIG_00541200 Image time interval: 0.000 to 2.048 [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 -0.356 sec. to 196.772 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.2626 ( -0.266289 0.24274 ) Norm@50keV : 6.75964E-04 ( -0.000123053 0.000119639 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.16 using 59 PHA bins. # Reduced chi-squared = 0.9677 for 57 degrees of freedom # Null hypothesis probability = 5.443615e-01 Photon flux (15-150 keV) in 197.1 sec: 0.115735 ( -0.013073 0.013072 ) ph/cm2/s Energy fluence (15-150 keV) : 1.26511e-06 ( -1.8495e-07 1.91817e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.356 sec. to 196.772 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.47482 ( -0.279909 0.892855 ) Epeak [keV] : 182.006 ( ) Norm@50keV : 5.20563E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.88 using 59 PHA bins. # Reduced chi-squared = 0.9800 for 56 degrees of freedom # Null hypothesis probability = 5.174077e-01 Photon flux (15-150 keV) in 197.1 sec: 0.114557 ( -0.013104 0.012852 ) ph/cm2/s Energy fluence (15-150 keV) : 1.15973e-06 ( -4.19005e-07 3.03481e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.068 sec. to 2.068 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.943988 ( -0.509374 0.604905 ) Norm@50keV : 8.91208E-03 ( -0.00280573 0.00263454 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 38.46 using 59 PHA bins. # Reduced chi-squared = 0.6748 for 57 degrees of freedom # Null hypothesis probability = 9.717057e-01 Photon flux (15-150 keV) in 1 sec: 1.02372 ( -0.31055 0.31568 ) ph/cm2/s Energy fluence (15-150 keV) : 9.83671e-08 ( -2.82845e-08 2.84506e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.068 sec. to 2.068 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.02142 ( -0.19299 0.0127621 ) Epeak [keV] : 7.46747 ( ) Norm@50keV : 8.24931E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 38.38 using 59 PHA bins. # Reduced chi-squared = 0.6854 for 56 degrees of freedom # Null hypothesis probability = 9.652697e-01 Photon flux (15-150 keV) in 1 sec: 1.03270 ( -0.357477 0.34273 ) ph/cm2/s Energy fluence (15-150 keV) : 9.9049e-08 ( -3.26961e-08 2.63517e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 182.696 sec. Hardness ratio (energy fluence ratio) = 0.833623674487
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 7.557607e-07 S(50-150 keV) = 5.093324e-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 = 0.031394799218, IMY = -0.659290200863
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: -239.768000 -0.356000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9674 -15.6370 0.3 32.6 -91.1 18.0561 39.0 0.7 Sco X-1 254.2263 35.3651 193.4 39.9 174.5 -0.0206 -0.1 11.4 Her X-1 268.3531 -1.4578 219.1 46.9 -128.0 0.0496 0.1 0.9 SW J1753.5-0127 177.9825 4.8088 3.2 44.2 40.9 2.4113 3.6 ------ UNKNOWN 203.8553 -20.0642 3.8 33.5 -15.0 0.8745 3.1 ------ UNKNOWN 204.9718 -45.3065 2.7 55.6 -32.9 5.6182 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.356000 25.532600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0195 -15.4975 59.4 32.6 -91.3 0.0183 0.2 8.9 Sco X-1 254.5637 35.2795 5.2 40.1 174.8 0.1970 2.2 6.4 Her X-1 268.4048 -1.5389 6.3 46.9 -127.9 -0.4658 -1.8 5.6 SW J1753.5-0127 171.8189 0.0140 2.2 51.0 35.7 1.6027 5.1 ------ UNKNOWN 189.0346 -0.0520 2.4 34.2 30.2 0.4077 4.9 ------ UNKNOWN 232.4661 4.7609 2.0 10.6 -120.1 0.3091 5.7 ------ UNKNOWN 280.4415 31.6566 2.6 58.7 -170.0 1.5510 4.5 ------ UNKNOWN 258.5412 -2.8002 1.8 37.7 -122.4 0.6644 6.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 78.932600 689.432600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4086 35.2280 31.2 49.1 -145.6 -0.9836 -0.4 7.3 Her X-1 258.8724 62.5431 3.9 51.3 178.5 7.9874 3.0 ------ UNKNOWN 250.0149 61.1549 3.2 47.0 179.2 7.7435 3.6 ------ UNKNOWN 241.3202 54.0046 2.3 40.5 -172.9 7.6591 5.0 ------ UNKNOWN 184.0322 -24.2253 3.8 55.5 -20.5 10.2337 3.1 ------ UNKNOWN 267.2911 41.8996 3.7 57.5 -156.4 14.8599 3.1 ------ UNKNOWN 256.0568 34.1506 3.5 50.6 -144.6 9.7635 3.3 ------ UNKNOWN 188.4292 -28.2571 3.0 58.8 -26.0 24.0886 3.9 ------ UNKNOWN 194.9221 -25.4786 4.4 55.6 -32.6 14.7526 2.6 ------ UNKNOWN 232.8590 8.0481 4.2 41.3 -98.7 13.4539 2.8 ------ UNKNOWN