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 22:29:40 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger544027
======================================================================
Trigger: 00544027 Segment: 000
BAT Trigger Time: 378241793.92 [s; MET]
Trigger Stop: 378241794.944 [s; MET]
UTC: 2012-12-26T19:09:43.890520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 168.657836545913 Dec: -30.4144824746842 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.23
Image Trigger?: NO
Rate S/N Ratio: 15.6843871413581 [ if not an image trigger ]
Image S/N Ratio: 7.23
Analysis Position: [ source = BAT ]
RA: 168.657836545913 Dec: -30.4144824746842 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 168.619872955185 Dec: -30.4129687748913 [deg; J2000]
{ 11h 14m 28.8s , -30d 24' 46.7" }
+/- 1.96270273044716 [arcmin] (estimated 90% radius based on SNR)
+/- 1.13694808261099 [arcmin] (formal 1-sigma fit error)
SNR: 11.6079297327899
Angular difference between the analysis and refined position is 1.966469 arcmin
Partial Coding Fraction: 0.359375 [ including projection effects ]
Duration
T90: 1.01199996471405 +/- 0.203214155154292
Measured from: -0.304000020027161
to: 0.70799994468689 [s; relative to TRIGTIME]
T50: 0.507999897003174 +/- 0.139713955893594
Measured from: 0.00400000810623169
to: 0.511999905109406 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.208000004291534
to: 0.791999995708466 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.364000022411346
to: 0.796000003814697 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.073028 0.065378 0.060557 0.038983
0.010370 0.011505 0.010324 0.008311 [error]
Peak 0.066487 0.057161 0.053113 0.039717
0.009728 0.010711 0.009760 0.007704 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 1.160 -0.364 0.796
T90 1.012 -0.304 0.708
T50 0.508 0.004 0.512
Peak 1.000 -0.208 0.792
====== 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 -1.504 -0.290 0.289 - - - 1.29e-02 -2.05e-03 2.04e-03 67.390 57
CPL -1.518 -0.275 0.309 9999.360 -9999.360 -9999.360 1.29e-02 -2.04e-03 8.72e-03 67.410 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 -1.469 -0.305 0.307 - - - 1.35e-02 -2.23e-03 2.22e-03 56.840 57
CPL -1.484 -0.290 0.512 9999.360 -9999.360 -9999.360 1.34e-02 -2.14e-03 9.64e-03 56.870 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 1.92e-08 3.52e-08 4.96e-08 1.47e-07 1.42e-07 2.51e-07 erg/cm2
90%_error_low -5.35e-09 -6.12e-09 -1.02e-08 -5.67e-08 -2.43e-08 -6.56e-08 erg/cm2
90%_error_hi 5.72e-09 5.96e-09 9.93e-09 7.68e-08 2.44e-08 8.10e-08 erg/cm2
Peak flux PL 5.38e-01 5.51e-01 3.98e-01 4.60e-01 1.67e+00 1.95e+00 ph/cm2/s
90%_error_low -1.61e-01 -1.05e-01 -8.21e-02 -1.74e-01 -2.88e-01 -3.21e-01 ph/cm2/s
90%_error_hi 1.75e-01 1.02e-01 7.95e-02 2.28e-01 2.89e-01 3.23e-01 ph/cm2/s
Fluence CPL 1.70e-08 2.38e-08 2.59e-08 6.42e-08 8.38e-08 1.31e-07 erg/cm2
90%_error_low -1.14e-08 -1.11e-08 -1.16e-08 -1.20e-08 -3.80e-08 -4.85e-08 erg/cm2
90%_error_hi 1.26e-09 7.36e-09 6.30e-09 8.72e-09 2.18e-08 2.38e-08 erg/cm2
Peak flux CPL 4.30e-01 2.60e-01 1.05e-01 7.86e-02 8.26e-01 8.54e-01 ph/cm2/s
90%_error_low -2.26e-01 -1.45e-01 -6.15e-02 -7.86e-02 -4.39e-01 -4.58e-01 ph/cm2/s
90%_error_hi 2.22e-01 2.32e-01 7.98e-02 7.94e-02 6.73e-01 1.45e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 168.6199 -30.4130 0.0164 47.4554 -14.6502 0.2510439 11.608 TRIG_00544027 Foreground time interval of the image: -0.364 0.796 (delta_t = 1.160 [sec]) Background time interval of the image: -239.920 -0.364 (delta_t = 239.556 [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 -0.364 sec. to 0.796 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.50354 ( -0.289525 0.289473 ) Norm@50keV : 1.29155E-02 ( -0.00205451 0.0020439 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 67.39 using 59 PHA bins. # Reduced chi-squared = 1.182 for 57 degrees of freedom # Null hypothesis probability = 1.633144e-01 Photon flux (15-150 keV) in 1.16 sec: 1.61394 ( -0.26622 0.26733 ) ph/cm2/s Energy fluence (15-150 keV) : 1.42062e-07 ( -2.4326e-08 2.44473e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.364 sec. to 0.796 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.51789 ( -0.276422 0.307599 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 1.29286E-02 ( -0.00204851 0.00871411 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 67.41 using 59 PHA bins. # Reduced chi-squared = 1.204 for 56 degrees of freedom # Null hypothesis probability = 1.412953e-01 Photon flux (15-150 keV) in 1.16 sec: 0.847367 ( ) ph/cm2/s Energy fluence (15-150 keV) : 8.37853e-08 ( -3.80262e-08 2.17646e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.208 sec. to 0.792 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.46916 ( -0.305271 0.306643 ) Norm@50keV : 1.34529E-02 ( -0.00223013 0.00222174 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.84 using 59 PHA bins. # Reduced chi-squared = 0.9973 for 57 degrees of freedom # Null hypothesis probability = 4.809236e-01 Photon flux (15-150 keV) in 1 sec: 1.66595 ( -0.28814 0.28949 ) ph/cm2/s Energy fluence (15-150 keV) : 1.28307e-07 ( -2.30018e-08 2.31154e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.208 sec. to 0.792 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.48447 ( -0.291489 0.510708 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 1.33871E-02 ( -0.00222605 0.0095512 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.87 using 59 PHA bins. # Reduced chi-squared = 1.016 for 56 degrees of freedom # Null hypothesis probability = 4.424366e-01 Photon flux (15-150 keV) in 1 sec: 0.825736 ( -0.439486 0.673284 ) ph/cm2/s Energy fluence (15-150 keV) : 7.11197e-08 ( -3.57004e-08 2.14673e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 1.012 sec. Hardness ratio (energy fluence ratio) = 1.4107823286
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.438725e-08 S(50-150 keV) = 8.767387e-08
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 = 1.054177635931437E+00, IMY = 2.755788578305471E-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: -239.920000 -0.364000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 124.3890 3.6443 2.8 40.4 67.0 2.5276 4.1 ------ UNKNOWN 143.7577 -10.1489 4.2 33.2 28.6 0.6230 2.8 ------ UNKNOWN 163.1025 42.1210 2.8 25.4 171.1 0.7106 4.1 ------ UNKNOWN 216.2534 59.8671 3.3 57.4 -160.1 2.8886 3.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.364000 0.796000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 125.3233 30.6914 2.5 37.3 110.5 0.1205 4.5 ------ UNKNOWN 156.9944 -32.7443 2.4 49.9 -1.5 0.1185 4.7 ------ UNKNOWN 168.6199 -30.4130 1.0 47.5 -14.7 0.2511 11.6 ------ UNKNOWN 216.3456 62.3988 2.3 58.5 -162.8 0.2839 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 84.380590 850.680590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4862 -40.5738 2.3 28.6 31.6 2.8298 5.1 2.2 Vela X-1 170.3884 -60.7970 18.0 30.4 -30.2 0.3180 0.6 10.7 Cen X-3 186.6787 -62.7789 0.6 34.4 -43.0 10.0087 17.9 0.8 GX 301-2 99.1702 -52.1340 3.5 54.2 16.7 8.3702 3.3 ------ UNKNOWN 123.4099 -58.7572 3.3 41.6 5.2 2.2411 3.6 ------ UNKNOWN 152.6216 -58.3417 2.1 30.0 -11.6 2.5677 5.4 ------ UNKNOWN 111.7145 -74.1780 3.2 52.0 -11.6 4.1899 3.6 ------ UNKNOWN 176.9814 -61.9745 2.3 32.0 -35.9 2.3622 5.0 ------ UNKNOWN 220.3736 -74.2808 3.8 50.8 -44.4 6.3457 3.0 ------ UNKNOWN