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 05:28:33 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger548276
======================================================================
Trigger: 00548276 Segment: 000
BAT Trigger Time: 382246602.368 [s; MET]
Trigger Stop: 382246610.56 [s; MET]
UTC: 2013-02-11T03:36:32.164500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 147.522617639919 Dec: -42.3387481449984 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.01
Image Trigger?: NO
Rate S/N Ratio: 9.38083151964686 [ if not an image trigger ]
Image S/N Ratio: 7.01
Analysis Position: [ source = BAT ]
RA: 147.522617639919 Dec: -42.3387481449984 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 147.518209461479 Dec: -42.3315182282187 [deg; J2000]
{ 09h 50m 04.4s , -42d 19' 53.5" }
+/- 2.15856975934095 [arcmin] (estimated 90% radius based on SNR)
+/- 0.849971320969526 [arcmin] (formal 1-sigma fit error)
SNR: 10.1330049214531
Angular difference between the analysis and refined position is 0.475820 arcmin
Partial Coding Fraction: 0.40625 [ including projection effects ]
Duration
T90: 30.7519999146461 +/- 6.35497978439702
Measured from: -1.42399996519089
to: 29.3279999494553 [s; relative to TRIGTIME]
T50: 9.54399996995926 +/- 6.72705727252734
Measured from: 3.06400001049042
to: 12.6079999804497 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -1.5799999833107
to: -0.579999983310699 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.40399998426437
to: 32.3120000362396 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.397292 0.447661 0.225546 0.023760
0.053078 0.052888 0.045113 0.038439 [error]
Peak 0.022329 0.035542 0.023731 0.006513
0.008798 0.008814 0.007934 0.006377 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 35.716 -3.404 32.312
T90 30.752 -1.424 29.328
T50 9.544 3.064 12.608
Peak 1.000 -1.580 -0.580
====== 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 -1.853 -0.255 0.243 - - - 1.98e-03 -3.19e-04 3.11e-04 61.910 57
CPL -1.692 -0.618 0.975 84.742 -84.720 -84.742 2.44e-03 -2.44e-03 6.15e-03 61.800 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 -1.554 -0.492 0.466 - - - 5.96e-03 -1.79e-03 1.76e-03 69.770 57
CPL -0.240 -1.662 3.688 69.266 -23.626 -69.266 2.63e-02 -2.63e-02 1.64e+00 68.520 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 1.26e-07 1.87e-07 2.07e-07 4.33e-07 6.52e-07 9.53e-07 erg/cm2
90%_error_low -2.52e-08 -2.54e-08 -4.45e-08 -1.62e-07 -1.03e-07 -2.13e-07 erg/cm2
90%_error_hi 2.61e-08 2.54e-08 4.49e-08 2.17e-07 1.05e-07 2.55e-07 erg/cm2
Peak flux PL 2.58e-01 2.52e-01 1.72e-01 1.83e-01 7.55e-01 8.65e-01 ph/cm2/s
90%_error_low -1.12e-01 -7.69e-02 -6.30e-02 -1.05e-01 -2.21e-01 -2.50e-01 ph/cm2/s
90%_error_hi 1.27e-01 7.57e-02 6.19e-02 1.60e-01 2.22e-01 2.52e-01 ph/cm2/s
Fluence CPL 1.24e-07 1.91e-07 2.07e-07 3.22e-07 6.42e-07 8.44e-07 erg/cm2
90%_error_low -2.75e-08 -2.87e-08 -4.67e-08 -2.49e-07 -1.15e-07 -2.85e-07 erg/cm2
90%_error_hi 2.77e-08 3.33e-08 4.63e-08 1.53e-07 1.12e-07 1.90e-07 erg/cm2
Peak flux CPL 1.99e-01 2.80e-01 1.94e-01 6.43e-02 7.21e-01 7.37e-01 ph/cm2/s
90%_error_low -1.34e-01 -9.12e-02 -7.53e-02 -6.43e-02 -2.31e-01 -2.45e-01 ph/cm2/s
90%_error_hi 1.54e-01 9.90e-02 7.98e-02 1.73e-01 2.30e-01 3.01e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 147.5182 -42.3315 0.0189 34.1083 39.1001 1.1217662 10.133 TRIG_00548276 Foreground time interval of the image: -3.404 32.312 (delta_t = 35.716 [sec]) Background time interval of the image: -239.368 -3.404 (delta_t = 235.964 [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 -3.404 sec. to 32.312 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.85273 ( -0.255446 0.243409 ) Norm@50keV : 1.98432E-03 ( -0.000319047 0.000310529 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.91 using 59 PHA bins. # Reduced chi-squared = 1.086 for 57 degrees of freedom # Null hypothesis probability = 3.051781e-01 Photon flux (15-150 keV) in 35.72 sec: 0.279242 ( -0.0383 0.038326 ) ph/cm2/s Energy fluence (15-150 keV) : 6.51811e-07 ( -1.03154e-07 1.05094e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.404 sec. to 32.312 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.69209 ( -0.618229 0.975161 ) Epeak [keV] : 84.7415 ( -84.7204 -84.7415 ) Norm@50keV : 2.44189E-03 ( -0.00244189 0.00615125 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.80 using 59 PHA bins. # Reduced chi-squared = 1.104 for 56 degrees of freedom # Null hypothesis probability = 2.766341e-01 Photon flux (15-150 keV) in 35.72 sec: 0.277656 ( -0.039139 0.019684 ) ph/cm2/s Energy fluence (15-150 keV) : 6.41803e-07 ( -1.15408e-07 1.12371e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -1.580 sec. to -0.580 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.55388 ( -0.492169 0.465746 ) Norm@50keV : 5.96080E-03 ( -0.0017918 0.00176072 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 69.77 using 59 PHA bins. # Reduced chi-squared = 1.224 for 57 degrees of freedom # Null hypothesis probability = 1.193639e-01 Photon flux (15-150 keV) in 1 sec: 0.755478 ( -0.220854 0.221689 ) ph/cm2/s Energy fluence (15-150 keV) : 5.60919e-08 ( -1.76911e-08 1.80733e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.580 sec. to -0.580 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.24015 ( -1.66296 3.68785 ) Epeak [keV] : 69.2655 ( -23.6272 -69.2666 ) Norm@50keV : 2.63034E-02 ( -0.0263168 1.6449 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 68.52 using 59 PHA bins. # Reduced chi-squared = 1.223 for 56 degrees of freedom # Null hypothesis probability = 1.217200e-01 Photon flux (15-150 keV) in 1 sec: 0.720856 ( -0.231069 0.22976 ) ph/cm2/s Energy fluence (15-150 keV) : 5.30078e-08 ( -1.80415e-08 1.87733e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 30.752 sec. Hardness ratio (energy fluence ratio) = 1.10751612798
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.132416e-07 S(50-150 keV) = 3.385676e-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 = 5.255861683523052E-01, IMY = -4.271340771280909E-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: -239.368000 -3.404000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4586 -40.4910 3.0 42.8 34.1 1.5952 3.8 5.0 Vela X-1 170.2822 -60.6238 1.0 18.5 -1.0 1.9366 11.6 1.0 Cen X-3 186.6555 -62.5882 8.5 14.2 -25.4 0.2421 1.4 10.9 GX 301-2 244.9694 -15.6426 0.7 51.8 -157.1 8.4822 16.3 0.6 Sco X-1 256.1038 -37.8041 8.1 43.6 -125.9 -0.8284 -1.4 6.1 4U 1700-377 256.4443 -36.4238 112.3 44.6 -127.3 0.0624 0.1 0.4 GX 349+2 184.3435 -14.3026 2.7 36.5 116.2 1.8993 4.3 ------ UNKNOWN 197.0856 -13.5923 2.0 35.9 137.3 1.8929 5.6 ------ UNKNOWN 135.4406 -50.6938 3.0 38.0 20.2 1.0212 3.9 ------ UNKNOWN 150.6217 -49.2085 3.2 29.3 28.8 0.8085 3.6 ------ UNKNOWN 152.9373 -82.4213 2.6 35.4 -34.9 1.0714 4.4 ------ UNKNOWN 54.4135 -70.5819 2.6 56.9 -29.8 4.7886 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -3.404000 32.312000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.7005 -40.5576 2.7 42.6 34.2 0.6473 4.2 7.8 Vela X-1 170.7014 -60.6750 7.6 18.3 -1.4 0.0924 1.5 11.8 Cen X-3 186.4241 -62.7042 6.5 14.3 -25.3 0.1025 1.8 7.5 GX 301-2 244.9822 -15.6377 67.6 51.8 -157.0 0.0287 0.2 0.2 Sco X-1 255.9612 -37.7143 14.4 43.5 -126.1 -0.1482 -0.8 7.9 4U 1700-377 256.5894 -36.3316 4.9 44.7 -127.3 0.4903 2.3 9.2 GX 349+2 147.5182 -42.3315 1.1 34.1 39.1 1.1218 10.1 ------ UNKNOWN 224.9184 -0.0585 2.3 55.1 171.7 1.6494 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 102.932620 463.532600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5040 -40.5747 0.9 9.2 10.3 2.7519 12.8 1.6 Vela X-1 170.3347 -60.6406 1.1 22.9 -116.0 2.9030 10.7 1.2 Cen X-3 186.6230 -62.6647 4.6 30.5 -121.6 0.8067 2.5 6.4 GX 301-2 150.5628 -16.3673 3.1 26.1 99.9 1.4150 3.7 ------ UNKNOWN 66.3653 -58.1219 3.4 50.8 -44.5 4.6415 3.4 ------ UNKNOWN 117.8731 -82.2195 2.3 41.0 -80.9 5.0554 5.1 ------ UNKNOWN 72.6462 -68.7927 3.2 45.7 -57.6 4.4650 3.6 ------ UNKNOWN