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 May 10 18:34:38 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger352190
======================================================================
Trigger: 00352190 Segment: 000
BAT Trigger Time: 264155275.52 [s; MET]
Trigger Stop: 264155302.4 [s; MET]
UTC: 2009-05-16T08:27:50.774420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 138.27070715192 Dec: -11.8577686574517 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.83
Image Trigger?: NO
Rate S/N Ratio: 14.1067359796659 [ if not an image trigger ]
Image S/N Ratio: 8.83
Analysis Position: [ source = BAT ]
RA: 138.27070715192 Dec: -11.8577686574517 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 138.254422253179 Dec: -11.855054128057 [deg; J2000]
{ 09h 13m 01.1s , -11d 51' 18.2" }
+/- 1.65577330511421 [arcmin] (estimated 90% radius based on SNR)
+/- 0.676737277251186 [arcmin] (formal 1-sigma fit error)
SNR: 14.7999410315788
Angular difference between the analysis and refined position is 0.970019 arcmin
Partial Coding Fraction: 0.06054688 [ including projection effects ]
Duration
T90: 181.00799998641 +/- 41.2551374382676
Measured from: -4.27200001478195
to: 176.735999971628 [s; relative to TRIGTIME]
T50: 76.3679999709129 +/- 11.3270620988023
Measured from: 11.7759999930859
to: 88.1439999639988 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.15599998831749
to: 6.15599998831749 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.54399999976158
to: 225.743999987841 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.385923 4.987197 3.492670 1.408950
0.277476 0.294842 0.273270 0.253677 [error]
Peak 0.065860 0.088430 0.131480 0.025508
0.028545 0.030056 0.029860 0.027937 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 234.288 -8.544 225.744
T90 181.008 -4.272 176.736
T50 76.368 11.776 88.144
Peak 1.000 5.156 6.156
====== 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 -1.673 -0.125 0.124 - - - 4.26e-03 -2.97e-04 2.95e-04 45.650 57
CPL -1.669 -0.499 0.283 9999.070 N/A N/A 4.26e-03 N/A N/A 45.660 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 -2.457 -0.640 0.490 - - - 1.21e-02 -5.51e-03 5.35e-03 76.600 57
CPL 2.828 -3.332 6.766 52.345 -14.035 12.190 3.07e+00 -3.07e+00 1.01e+03 68.220 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 1.49e-06 2.47e-06 3.09e-06 7.73e-06 9.21e-06 1.48e-05 erg/cm2
90%_error_low -1.76e-07 -1.77e-07 -2.83e-07 -1.43e-06 -6.71e-07 -1.66e-06 erg/cm2
90%_error_hi 1.83e-07 1.76e-07 2.81e-07 1.63e-06 6.75e-07 1.81e-06 erg/cm2
Peak flux PL 1.25e+00 7.23e-01 2.64e-01 1.28e-01 2.31e+00 2.37e+00 ph/cm2/s
90%_error_low -5.84e-01 -2.84e-01 -1.40e-01 -1.28e-01 -9.26e-01 -9.32e-01 ph/cm2/s
90%_error_hi 6.40e-01 2.84e-01 1.40e-01 1.32e-01 9.38e-01 9.47e-01 ph/cm2/s
Fluence CPL 1.52e-06 2.45e-06 3.07e-06 7.70e-06 9.28e-06 1.49e-05 erg/cm2
90%_error_low -2.09e-07 -1.86e-07 N/A N/A -7.45e-07 -3.36e-06 erg/cm2
90%_error_hi 1.55e-07 2.11e-07 N/A N/A 5.99e-07 1.71e-06 erg/cm2
Peak flux CPL 3.52e-01 1.03e+00 6.14e-01 3.43e-02 2.02e+00 2.04e+00 ph/cm2/s
90%_error_low -3.52e-01 -5.03e-01 N/A -3.43e-02 -7.98e-01 -8.18e-01 ph/cm2/s
90%_error_hi 7.60e-01 4.22e-01 N/A 6.37e-02 9.31e-01 9.38e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 138.2544 -11.8551 0.0128 58.1917 -164.2665 9.1456107 14.800 TRIG_00352190 Foreground time interval of the image: -8.544 42.480 (delta_t = 51.024 [sec]) 43.480 80.781 (delta_t = 37.301 [sec]) Background time interval of the image: -239.520 -8.544 (delta_t = 230.976 [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
Multiple GTIs in the spectrum tstart tstop -8.544000 42.480000 43.480000 225.744000 Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.67279 ( -0.125025 0.123676 ) Norm@50keV : 4.25551E-03 ( -0.000296576 0.00029525 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.65 using 59 PHA bins. # Reduced chi-squared = 0.8009 for 57 degrees of freedom # Null hypothesis probability = 8.597364e-01 Photon flux (15-150 keV) in 233.3 sec: 0.559936 ( -0.040175 0.04035 ) ph/cm2/s Energy fluence (15-150 keV) : 9.21477e-06 ( -6.71484e-07 6.74515e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum tstart tstop -8.544000 42.480000 43.480000 225.744000 Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.11838 ( -0.0489578 0.732378 ) Epeak [keV] : 48.7435 ( ) Norm@50keV : 2.34013E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.14 using 59 PHA bins. # Reduced chi-squared = 0.8060 for 56 degrees of freedom # Null hypothesis probability = 8.502457e-01 Photon flux (15-150 keV) in 233.3 sec: 0.563192 ( -0.043652 0.037204 ) ph/cm2/s Energy fluence (15-150 keV) : 9.28249e-06 ( -7.44521e-07 5.98594e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 5.156 sec. to 6.156 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.45739 ( -0.648597 0.48097 ) Norm@50keV : 1.20634E-02 ( -0.00552423 0.00533364 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 76.60 using 59 PHA bins. # Reduced chi-squared = 1.344 for 57 degrees of freedom # Null hypothesis probability = 4.266422e-02 Photon flux (15-150 keV) in 1 sec: 2.30729 ( -0.9259 0.93818 ) ph/cm2/s Energy fluence (15-150 keV) : 1.19435e-07 ( -4.76556e-08 4.80284e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.156 sec. to 6.156 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 2.82817 ( -3.3531 6.74468 ) Epeak [keV] : 52.3451 ( -14.3555 11.8692 ) Norm@50keV : 3.06854 ( -3.26304 1010.83 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 68.22 using 59 PHA bins. # Reduced chi-squared = 1.218 for 56 degrees of freedom # Null hypothesis probability = 1.266575e-01 Photon flux (15-150 keV) in 1 sec: 2.01683 ( -0.79842 0.93146 ) ph/cm2/s Energy fluence (15-150 keV) : 1.41981e-07 ( -4.6596e-08 5.00273e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 181.008 sec. Hardness ratio (energy fluence ratio) = 1.25464291116
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.957375e-06 S(50-150 keV) = 5.257364e-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 = -1.551903772399309E+00, IMY = 4.372005025302858E-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: -239.520000 -8.544000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 145.3927 -2.7243 2.9 47.7 -158.2 1.4577 4.0 ------ UNKNOWN 151.9503 14.0858 3.3 36.2 -137.2 0.9551 3.5 ------ UNKNOWN 197.0440 67.3351 2.6 50.7 -44.4 4.3175 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -8.544000 42.480000 43.480000 80.780600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 150.4887 -20.3213 2.4 53.3 179.2 1.7308 4.9 ------ UNKNOWN 138.2545 -11.8551 0.8 58.2 -164.3 9.1318 13.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 155.380600 606.380600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5402 -40.5580 0.4 28.8 164.8 10.6120 32.3 0.6 Vela X-1 138.2680 -11.8874 1.7 0.0 175.9 1.8768 6.7 ------ UNKNOWN 124.2645 39.0957 3.9 52.6 -33.3 3.1587 2.9 ------ UNKNOWN