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 00:01:32 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger535960
======================================================================
Trigger: 00535960 Segment: 000
BAT Trigger Time: 371938326.208 [s; MET]
Trigger Stop: 371938326.72 [s; MET]
UTC: 2012-10-14T20:11:56.448420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 166.630696384298 Dec: -29.1090441328934 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.69
Image Trigger?: NO
Rate S/N Ratio: 22.956480566498 [ if not an image trigger ]
Image S/N Ratio: 11.69
Analysis Position: [ source = BAT ]
RA: 166.630696384298 Dec: -29.1090441328934 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 166.650291651359 Dec: -29.1086598526773 [deg; J2000]
{ 11h 06m 36.1s , -29d 06' 31.2" }
+/- 1.59548380864483 [arcmin] (estimated 90% radius based on SNR)
+/- 0.672821436330319 [arcmin] (formal 1-sigma fit error)
SNR: 15.6052989384844
Angular difference between the analysis and refined position is 1.027478 arcmin
Partial Coding Fraction: 0.7265625 [ including projection effects ]
Duration
T90: 80 +/- 22.6274169979695
Measured from: -15.2080000042915
to: 64.7919999957085 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: 16.7919999957085
to: 48.7919999957085 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 56.2919999957085
to: 57.2919999957085 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.2080000042915
to: 64.7919999957085 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.633158 0.700432 0.415270 0.041049
0.056578 0.057809 0.049917 0.041685 [error]
Peak 0.032264 0.020570 0.000546 0.002167
0.006777 0.006779 0.005679 0.004678 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 80.000 -15.208 64.792
T90 80.000 -15.208 64.792
T50 32.000 16.792 48.792
Peak 1.000 56.292 57.292
====== 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 -1.873 -0.177 0.171 - - - 1.45e-03 -1.57e-04 1.54e-04 60.350 57
CPL -1.875 -0.667 0.219 9999.360 N/A N/A 1.45e-03 N/A N/A 60.350 56
=== 1-s peak 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 -3.084 -1.067 0.737 - - - 1.84e-03 -1.22e-03 1.51e-03 48.840 57
CPL -1.146 N/A N/A 11.996 N/A N/A 4.85e-02 N/A N/A 48.040 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 2.11e-07 3.09e-07 3.37e-07 6.89e-07 1.07e-06 1.55e-06 erg/cm2
90%_error_low -2.91e-08 -2.80e-08 -4.97e-08 -1.88e-07 -1.13e-07 -2.41e-07 erg/cm2
90%_error_hi 3.00e-08 2.80e-08 5.00e-08 2.30e-07 1.15e-07 2.73e-07 erg/cm2
Peak flux PL 3.55e-01 1.43e-01 3.37e-02 9.65e-03 5.38e-01 5.42e-01 ph/cm2/s
90%_error_low -1.15e-01 -6.75e-02 -3.37e-02 -9.65e-03 -1.66e-01 -1.69e-01 ph/cm2/s
90%_error_hi 1.15e-01 6.39e-02 3.96e-02 2.77e-02 1.68e-01 1.72e-01 ph/cm2/s
Fluence CPL 2.12e-07 3.08e-07 3.37e-07 6.88e-07 1.07e-06 1.55e-06 erg/cm2
90%_error_low -3.41e-08 -2.71e-08 N/A N/A -1.77e-07 -4.80e-07 erg/cm2
90%_error_hi 3.09e-08 3.61e-08 N/A N/A 8.69e-08 1.34e-07 erg/cm2
Peak flux CPL 3.58e-01 1.44e-01 3.56e-02 8.88e-03 5.40e-01 5.41e-01 ph/cm2/s
90%_error_low -1.16e-01 -7.01e-02 -3.56e-02 N/A -1.68e-01 -1.66e-01 ph/cm2/s
90%_error_hi 1.12e-01 6.43e-02 3.86e-02 N/A 1.66e-01 1.75e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 166.6503 -29.1087 0.0123 32.6615 -25.5862 1.9693963 15.605 TRIG_00535960 Foreground time interval of the image: -15.208 64.792 (delta_t = 80.000 [sec]) Background time interval of the image: -239.208 -15.208 (delta_t = 224.000 [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 -15.208 sec. to 64.792 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.87324 ( -0.176782 0.170569 ) Norm@50keV : 1.45097E-03 ( -0.000156937 0.000153687 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.35 using 59 PHA bins. # Reduced chi-squared = 1.059 for 57 degrees of freedom # Null hypothesis probability = 3.555931e-01 Photon flux (15-150 keV) in 80 sec: 0.205916 ( -0.018956 0.018977 ) ph/cm2/s Energy fluence (15-150 keV) : 1.06728e-06 ( -1.13408e-07 1.15135e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.208 sec. to 64.792 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.8748 ( -0.66741 0.218076 ) Epeak [keV] : 9999.36 ( ) Norm@50keV : 1.45008E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.35 using 59 PHA bins. # Reduced chi-squared = 1.078 for 56 degrees of freedom # Null hypothesis probability = 3.213793e-01 Photon flux (15-150 keV) in 80 sec: 0.206146 ( -0.019366 0.018963 ) ph/cm2/s Energy fluence (15-150 keV) : 1.07186e-06 ( -1.76746e-07 8.694e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 56.292 sec. to 57.292 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -3.08398 ( -1.06665 0.736815 ) Norm@50keV : 1.83896E-03 ( -0.00121822 0.00150606 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.84 using 59 PHA bins. # Reduced chi-squared = 0.8569 for 57 degrees of freedom # Null hypothesis probability = 7.705869e-01 Photon flux (15-150 keV) in 1 sec: 0.538061 ( -0.166368 0.167676 ) ph/cm2/s Energy fluence (15-150 keV) : 2.30012e-08 ( -8.93619e-09 1.05432e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 56.292 sec. to 57.292 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.14556 ( ) Epeak [keV] : 11.9958 ( ) Norm@50keV : 4.84756E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.04 using 59 PHA bins. # Reduced chi-squared = 0.8579 for 56 degrees of freedom # Null hypothesis probability = 7.664053e-01 Photon flux (15-150 keV) in 1 sec: 0.540252 ( -0.167665 0.165829 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 80.0 sec. Hardness ratio (energy fluence ratio) = 1.09186767782
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.191908e-07 S(50-150 keV) = 5.480934e-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 = 5.781785104130348E-01, IMY = 2.768453301559334E-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: -239.208000 -15.208000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5255 -40.5553 0.8 43.3 17.1 4.7404 14.2 0.1 Vela X-1 123.5147 32.8737 2.8 42.0 142.9 1.7610 4.1 ------ UNKNOWN 158.4024 33.8467 2.5 34.2 -170.8 0.9993 4.6 ------ UNKNOWN 174.1599 -53.0036 2.3 56.5 -16.8 3.2558 5.0 ------ UNKNOWN 192.5811 8.4050 2.9 41.6 -103.2 3.9943 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -15.208000 64.792000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5114 -40.5577 2.3 43.3 17.1 -1.0818 -5.1 0.8 Vela X-1 123.4322 36.8297 2.7 44.9 146.8 1.2082 4.3 ------ UNKNOWN 164.2670 27.1290 2.6 29.5 -157.5 0.5089 4.4 ------ UNKNOWN 166.6503 -29.1087 0.7 32.7 -25.6 1.9697 15.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: