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 22:35:13 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger542441
======================================================================
Trigger: 00542441 Segment: 000
BAT Trigger Time: 377421477.888 [s; MET]
Trigger Stop: 377421478.912 [s; MET]
UTC: 2012-12-17T07:17:47.893900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 153.72364002391 Dec: -62.30383321643 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.88
Image Trigger?: NO
Rate S/N Ratio: 20.4939015319192 [ if not an image trigger ]
Image S/N Ratio: 8.88
Analysis Position: [ source = BAT ]
RA: 153.72364002391 Dec: -62.30383321643 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 153.709654462856 Dec: -62.3547400564023 [deg; J2000]
{ 10h 14m 50.3s , -62d 21' 17.1" }
+/- 0.854711100208287 [arcmin] (estimated 90% radius based on SNR)
+/- 0.407439340694848 [arcmin] (formal 1-sigma fit error)
SNR: 38.0644287758287
Angular difference between the analysis and refined position is 3.079168 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 778.091999948025 +/- 16.1379687707901
Measured from: -11.6320000290871
to: 766.459999918938 [s; relative to TRIGTIME]
T50: 128.015999913216 +/- 322.562169173793
Measured from: 608.740000009537
to: 736.755999922752 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 735.959999978542
to: 736.959999978542 [s; relative to TRIGTIME]
Total Fluence
Measured from: -17.7319999933243
to: 783.759999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.029455 3.953523 2.862401 0.651227
0.145425 0.147412 0.126853 0.109185 [error]
Peak 0.062619 0.083078 0.063784 0.021050
0.006137 0.006371 0.005613 0.004427 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 801.492 -17.732 783.760
T90 778.092 -11.632 766.460
T50 128.016 608.740 736.756
Peak 1.000 735.960 736.960
====== 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 -1.540 -0.083 0.083 - - - 8.16e-04 -3.63e-05 3.61e-05 53.360 57
CPL -1.497 -0.121 0.272 589.351 -589.351 -589.351 8.57e-04 -7.53e-05 2.96e-04 53.410 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 -1.479 -0.147 0.146 - - - 1.41e-02 -1.21e-03 1.20e-03 54.410 57
CPL -1.332 -0.280 0.569 226.072 -226.072 -226.072 1.68e-02 -5.26e-03 1.53e-02 54.170 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 8.67e-07 1.55e-06 2.14e-06 6.10e-06 6.17e-06 1.07e-05 erg/cm2
90%_error_low -6.93e-08 -7.32e-08 -1.25e-07 -7.60e-07 -2.97e-07 -8.50e-07 erg/cm2
90%_error_hi 7.12e-08 7.29e-08 1.25e-07 8.34e-07 2.98e-07 9.10e-07 erg/cm2
Peak flux PL 5.70e-01 5.81e-01 4.17e-01 4.77e-01 1.75e+00 2.04e+00 ph/cm2/s
90%_error_low -8.00e-02 -5.13e-02 -4.54e-02 -9.89e-02 -1.47e-01 -1.73e-01 ph/cm2/s
90%_error_hi 8.32e-02 5.09e-02 4.50e-02 1.14e-01 1.47e-01 1.74e-01 ph/cm2/s
Fluence CPL 8.67e-07 1.56e-06 2.14e-06 6.07e-06 6.16e-06 1.06e-05 erg/cm2
90%_error_low -8.43e-08 -7.29e-08 -9.90e-08 -2.29e-06 -3.38e-07 -2.29e-06 erg/cm2
90%_error_hi 5.50e-08 8.33e-08 1.31e-07 5.00e-07 2.96e-07 5.36e-07 erg/cm2
Peak flux CPL 5.55e-01 5.89e-01 4.22e-01 3.97e-01 1.74e+00 1.96e+00 ph/cm2/s
90%_error_low -9.45e-02 -5.72e-02 -4.83e-02 -1.86e-01 -1.52e-01 -2.50e-01 ph/cm2/s
90%_error_hi 4.79e-02 6.00e-02 4.96e-02 1.34e-01 1.52e-01 2.41e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 153.7097 -62.3547 0.0050 10.5113 -89.4606 2.6487573 38.064 TRIG_00542441 Foreground time interval of the image: -17.732 20.813 (delta_t = 38.545 [sec]) Background time interval of the image: -239.888 -17.732 (delta_t = 222.156 [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 -17.732 sec. to 783.760 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.54024 ( -0.0828057 0.082591 ) Norm@50keV : 8.15804E-04 ( -3.62652e-05 3.61498e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.36 using 59 PHA bins. # Reduced chi-squared = 0.9362 for 57 degrees of freedom # Null hypothesis probability = 6.123453e-01 Photon flux (15-150 keV) in 801.5 sec: 0.102989 ( -0.004708 0.004723 ) ph/cm2/s Energy fluence (15-150 keV) : 6.16515e-06 ( -2.971e-07 2.9844e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -17.732 sec. to 783.760 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.5379 ( -0.0838397 0.309206 ) Epeak [keV] : 9998.17 ( -9998.14 -9998.14 ) Norm@50keV : 8.18041E-04 ( -3.61188e-05 0.000334757 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.36 using 59 PHA bins. # Reduced chi-squared = 0.9529 for 56 degrees of freedom # Null hypothesis probability = 5.753536e-01 Photon flux (15-150 keV) in 801.5 sec: 0.102961 ( -0.0050673 0.004699 ) ph/cm2/s Energy fluence (15-150 keV) : 6.16373e-06 ( -3.37686e-07 2.9599e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 735.960 sec. to 736.960 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.47906 ( -0.147292 0.145995 ) Norm@50keV : 1.41262E-02 ( -0.00121124 0.00120423 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.41 using 59 PHA bins. # Reduced chi-squared = 0.9545 for 57 degrees of freedom # Null hypothesis probability = 5.729084e-01 Photon flux (15-150 keV) in 1 sec: 1.75381 ( -0.14688 0.147 ) ph/cm2/s Energy fluence (15-150 keV) : 1.34496e-07 ( -1.27345e-08 1.28709e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 735.960 sec. to 736.960 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.33182 ( -0.279586 0.568879 ) Epeak [keV] : 226.072 ( -226.195 -226.195 ) Norm@50keV : 1.67929E-02 ( -0.00525852 0.0153096 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.17 using 59 PHA bins. # Reduced chi-squared = 0.9674 for 56 degrees of freedom # Null hypothesis probability = 5.442549e-01 Photon flux (15-150 keV) in 1 sec: 1.74254 ( -0.15214 0.1516 ) ph/cm2/s Energy fluence (15-150 keV) : 1.32914e-07 ( -1.39817e-08 1.37285e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
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 = 1.746644344066289E-03, IMY = 1.855342398251260E-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: -239.888000 -17.732000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4886 -40.5192 3.2 14.8 121.6 0.6720 3.6 2.8 Vela X-1 170.4629 -60.6805 2.5 17.5 -107.3 0.7999 4.5 5.5 Cen X-3 186.6455 -62.7692 3.2 25.1 -101.6 0.7818 3.6 0.3 GX 301-2 152.4723 -58.2919 0.9 8.1 -110.3 2.0253 12.3 ------ UNKNOWN 170.6289 -83.4685 2.5 29.5 -55.6 0.9531 4.7 ------ UNKNOWN 6.4332 -60.1006 2.9 58.7 -23.0 4.6042 4.0 ------ UNKNOWN 231.9109 -72.4875 3.4 39.3 -76.9 1.7725 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -17.732000 20.812600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4545 -40.6807 4.7 14.7 121.4 0.1856 2.5 8.3 Vela X-1 170.3584 -60.6167 76.6 17.4 -107.5 -0.0113 -0.2 1.3 Cen X-3 186.3500 -62.6767 10.3 25.0 -101.8 0.0969 1.1 10.1 GX 301-2 178.1838 -7.1342 2.4 57.3 179.9 2.0865 4.9 ------ UNKNOWN 153.7097 -62.3547 0.3 10.5 -89.5 2.6488 38.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 53.212600 962.146000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5232 -40.5249 1.8 24.4 115.5 4.3323 6.4 1.8 Vela X-1 170.3456 -60.5629 2.6 8.1 -124.4 2.0298 4.4 3.7 Cen X-3 186.6465 -62.7781 0.8 15.0 -103.0 6.6862 14.8 0.5 GX 301-2 107.7877 -36.1130 3.0 38.5 81.7 8.0388 3.8 ------ UNKNOWN 152.4342 -58.2890 0.6 4.1 141.2 10.2037 20.5 ------ UNKNOWN 153.6992 -62.3570 0.6 0.0 -36.6 9.0901 19.3 ------ UNKNOWN 16.4879 -62.1612 2.8 51.4 -5.5 5.2943 4.2 ------ UNKNOWN 6.1281 -65.7580 2.7 49.7 -12.7 4.2732 4.2 ------ UNKNOWN 190.2856 -9.4799 3.2 59.1 -166.2 10.3911 3.6 ------ UNKNOWN 333.1831 -68.4054 3.0 49.3 -29.7 3.9298 3.8 ------ UNKNOWN