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: Fri Jan 17 18:38:45 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger421386
======================================================================
Trigger: 00421386 Segment: 000
BAT Trigger Time: 295003248 [s; MET]
Trigger Stop: 295003312 [s; MET]
UTC: 2010-05-08T09:20:42.221700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 76.2500038130658 Dec: -20.7209133097938 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.47
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.47
Analysis Position: [ source = BAT ]
RA: 76.2500038130658 Dec: -20.7209133097938 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 76.2623306053277 Dec: -20.7385461703544 [deg; J2000]
{ 05h 05m 03.0s , -20d 44' 18.8" }
+/- 2.05586667055115 [arcmin] (estimated 90% radius based on SNR)
+/- 1.18039143244673 [arcmin] (formal 1-sigma fit error)
SNR: 10.8638245466385
Angular difference between the analysis and refined position is 1.264037 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 49.2599999308586 +/- 7.42963064686218
Measured from: 3.53200000524521
to: 52.7919999361038 [s; relative to TRIGTIME]
T50: 21.7879999876022 +/- 10.8364505686661
Measured from: 8.43599998950958
to: 30.2239999771118 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 30.6000000238419
to: 31.6000000238419 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.53200000524521
to: 58.3759999871254 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.155092 0.411623 0.352586 0.162341
0.049021 0.050998 0.046172 0.042644 [error]
Peak 0.012240 0.017449 0.024116 0.004880
0.006168 0.006458 0.005995 0.005533 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 59.908 -1.532 58.376
T90 49.260 3.532 52.792
T50 21.788 8.436 30.224
Peak 1.000 30.600 31.600
====== 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 -1.218 -0.235 0.241 - - - 1.24e-03 -1.68e-04 1.68e-04 35.610 57
CPL -0.889 -0.535 1.091 179.998 -179.998 -179.998 1.78e-03 -6.91e-04 3.94e-03 35.230 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 -1.111 -0.562 0.605 - - - 4.05e-03 -1.28e-03 1.27e-03 64.030 57
CPL -0.795 0.795 3.031 224.527 -224.527 -224.527 5.55e-03 -2.70e-03 7.78e-02 63.960 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 7.29e-08 1.59e-07 2.74e-07 1.09e-06 7.50e-07 1.59e-06 erg/cm2
90%_error_low -1.83e-08 -2.53e-08 -4.38e-08 -3.42e-07 -1.10e-07 -3.75e-07 erg/cm2
90%_error_hi 1.98e-08 2.47e-08 4.33e-08 4.42e-07 1.11e-07 4.59e-07 erg/cm2
Peak flux PL 1.15e-01 1.46e-01 1.35e-01 2.19e-01 4.70e-01 6.15e-01 ph/cm2/s
90%_error_low -6.53e-02 -5.87e-02 -4.70e-02 -1.28e-01 -1.53e-01 -1.97e-01 ph/cm2/s
90%_error_hi 8.26e-02 5.62e-02 4.56e-02 2.12e-01 1.55e-01 2.09e-01 ph/cm2/s
Fluence CPL 6.82e-08 1.64e-07 2.82e-07 6.80e-07 7.34e-07 1.19e-06 erg/cm2
90%_error_low -2.21e-08 -2.81e-08 -4.86e-08 -4.69e-07 -1.22e-07 -4.83e-07 erg/cm2
90%_error_hi 2.04e-08 2.97e-08 5.04e-08 8.67e-07 1.19e-07 4.88e-07 erg/cm2
Peak flux CPL 1.05e-01 1.48e-01 1.40e-01 1.63e-01 4.63e-01 5.59e-01 ph/cm2/s
90%_error_low -8.16e-02 -6.24e-02 -5.17e-02 -1.63e-01 -1.60e-01 -2.38e-01 ph/cm2/s
90%_error_hi 9.05e-02 6.22e-02 5.96e-02 2.56e-01 1.56e-01 2.57e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 76.2623 -20.7385 0.0177 34.1411 -4.7471 1.1209384 10.864 TRIG_00421386 Foreground time interval of the image: -1.532 58.376 (delta_t = 59.908 [sec]) Background time interval of the image: -239.000 -1.532 (delta_t = 237.468 [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 -1.532 sec. to 58.376 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.21834 ( -0.234745 0.241159 ) Norm@50keV : 1.23973E-03 ( -0.000167895 0.000167811 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 35.61 using 59 PHA bins. # Reduced chi-squared = 0.6247 for 57 degrees of freedom # Null hypothesis probability = 9.882331e-01 Photon flux (15-150 keV) in 59.91 sec: 0.145907 ( -0.020546 0.020622 ) ph/cm2/s Energy fluence (15-150 keV) : 7.49756e-07 ( -1.10361e-07 1.11316e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.532 sec. to 58.376 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.888843 ( -0.534714 1.09111 ) Epeak [keV] : 179.998 ( -180.008 -180.008 ) Norm@50keV : 1.78330E-03 ( -0.000690971 0.00393894 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 35.23 using 59 PHA bins. # Reduced chi-squared = 0.6291 for 56 degrees of freedom # Null hypothesis probability = 9.864954e-01 Photon flux (15-150 keV) in 59.91 sec: 0.143876 ( -0.021358 0.021345 ) ph/cm2/s Energy fluence (15-150 keV) : 7.33586e-07 ( -1.22068e-07 1.19414e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 30.600 sec. to 31.600 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.11132 ( -0.561638 0.604743 ) Norm@50keV : 4.05151E-03 ( -0.00128365 0.00126821 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.03 using 59 PHA bins. # Reduced chi-squared = 1.123 for 57 degrees of freedom # Null hypothesis probability = 2.435193e-01 Photon flux (15-150 keV) in 1 sec: 0.470476 ( -0.152803 0.154573 ) ph/cm2/s Energy fluence (15-150 keV) : 4.22124e-08 ( -1.40188e-08 1.42267e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 30.600 sec. to 31.600 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.794811 ( 0.794797 3.03108 ) Epeak [keV] : 224.527 ( -224.519 -224.519 ) Norm@50keV : 5.55475E-03 ( -0.00269529 0.0778375 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 63.96 using 59 PHA bins. # Reduced chi-squared = 1.142 for 56 degrees of freedom # Null hypothesis probability = 2.172477e-01 Photon flux (15-150 keV) in 1 sec: 0.463216 ( -0.160221 0.155548 ) ph/cm2/s Energy fluence (15-150 keV) : 4.1686e-08 ( -1.46638e-08 1.43904e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 49.26 sec. Hardness ratio (energy fluence ratio) = 1.71913533913
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.3208917e-07 S(50-150 keV) = 5.176788e-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 = 6.757725958994587E-01, IMY = 5.611813211728716E-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: -239.000000 -1.532000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 337.0908 -40.8013 2.9 50.8 153.9 3.2039 4.0 ------ UNKNOWN 25.1188 -52.0420 2.5 23.8 116.4 1.0755 4.6 ------ UNKNOWN 85.1303 0.2865 2.5 53.0 -23.6 2.4903 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.532000 58.376000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 15.4628 -45.2482 2.4 23.9 139.5 0.4783 4.8 ------ UNKNOWN 76.2624 -20.7385 1.1 34.1 -4.7 1.1213 10.8 ------ UNKNOWN 2.2354 5.0298 2.4 50.7 -138.1 1.8441 4.7 330.2 UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 131.500590 963.062600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6215 22.0205 0.3 43.3 -38.7 33.6821 34.2 0.7 Crab 93.0113 -1.3419 3.5 25.3 -6.4 1.6893 3.4 ------ UNKNOWN