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 19 19:09:15 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger339696
======================================================================
Trigger: 00339696 Segment: 000
BAT Trigger Time: 253411106.112 [s; MET]
Trigger Stop: 253411107.136 [s; MET]
UTC: 2009-01-11T23:58:21.703320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 251.645117762436 Dec: 0.0910882533427581 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.11
Image Trigger?: NO
Rate S/N Ratio: 10.2469507659596 [ if not an image trigger ]
Image S/N Ratio: 7.11
Analysis Position: [ source = BAT ]
RA: 251.645117762436 Dec: 0.0910882533427581 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 251.652519911681 Dec: 0.0625914250328804 [deg; J2000]
{ 16h 46m 36.6s , +00d 03' 45.3" }
+/- 1.42779614575988 [arcmin] (estimated 90% radius based on SNR)
+/- 0.562278298975681 [arcmin] (formal 1-sigma fit error)
SNR: 18.2880187436005
Angular difference between the analysis and refined position is 1.766550 arcmin
Partial Coding Fraction: 0.8203125 [ including projection effects ]
Duration
T90: 25.2600000202656 +/- 2.65513238362588
Measured from: -1.63199999928474
to: 23.6280000209808 [s; relative to TRIGTIME]
T50: 13.7320000231266 +/- 1.45813578614825
Measured from: 2.19600000977516
to: 15.9280000329018 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 10.7080000042915
to: 11.7080000042915 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.87999999523163
to: 26.0360000133514 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.543534 0.518783 0.206302 0.064775
0.034258 0.032814 0.028541 0.026517 [error]
Peak 0.036706 0.039291 0.021636 0.012242
0.006621 0.006304 0.005403 0.004908 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 28.916 -2.880 26.036
T90 25.260 -1.632 23.628
T50 13.732 2.196 15.928
Peak 1.000 10.708 11.708
====== 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 -2.284 -0.166 0.158 - - - 2.42e-03 -2.64e-04 2.60e-04 47.430 57
CPL -1.793 -0.434 0.760 16.355 -15.142 16.251 4.76e-03 -1.65e-03 8.89e-03 45.740 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 -1.774 -0.333 0.317 - - - 6.52e-03 -1.32e-03 1.27e-03 48.610 57
CPL -1.609 -0.779 1.365 106.416 -91.527 -106.416 8.04e-03 -8.04e-03 3.81e-02 48.540 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 1.88e-07 2.15e-07 1.76e-07 2.43e-07 6.66e-07 8.21e-07 erg/cm2
90%_error_low -1.98e-08 -1.68e-08 -2.63e-08 -6.43e-08 -5.94e-08 -9.80e-08 erg/cm2
90%_error_hi 2.03e-08 1.67e-08 2.72e-08 7.93e-08 6.06e-08 1.09e-07 erg/cm2
Peak flux PL 3.49e-01 2.99e-01 1.75e-01 1.53e-01 8.90e-01 9.76e-01 ph/cm2/s
90%_error_low -9.27e-02 -5.25e-02 -4.56e-02 -6.67e-02 -1.56e-01 -1.71e-01 ph/cm2/s
90%_error_hi 9.85e-02 5.23e-02 4.58e-02 9.30e-02 1.56e-01 1.72e-01 ph/cm2/s
Fluence CPL 1.81e-07 2.26e-07 1.66e-07 9.69e-08 6.30e-07 6.69e-07 erg/cm2
90%_error_low -2.22e-08 -2.05e-08 -3.35e-08 -6.57e-08 -7.10e-08 -1.02e-07 erg/cm2
90%_error_hi 2.11e-08 2.24e-08 3.12e-08 1.23e-07 7.34e-08 1.50e-07 erg/cm2
Peak flux CPL 3.42e-01 3.05e-01 1.76e-01 1.21e-01 8.83e-01 9.44e-01 ph/cm2/s
90%_error_low -1.05e-01 -5.75e-02 -6.11e-02 -1.21e-01 -1.61e-01 -2.04e-01 ph/cm2/s
90%_error_hi 1.06e-01 6.70e-02 4.81e-02 4.93e-02 1.60e-01 2.00e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 251.6525 0.0626 0.0105 25.1077 -139.9929 1.0743764 18.288 TRIG_00339696 Foreground time interval of the image: -2.880 19.789 (delta_t = 22.669 [sec]) Background time interval of the image: -239.112 -2.880 (delta_t = 236.232 [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 -2.880 sec. to 26.036 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.28406 ( -0.165797 0.158001 ) Norm@50keV : 2.41804E-03 ( -0.000264247 0.000260292 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.43 using 59 PHA bins. # Reduced chi-squared = 0.8322 for 57 degrees of freedom # Null hypothesis probability = 8.128211e-01 Photon flux (15-150 keV) in 28.92 sec: 0.418904 ( -0.031875 0.0319 ) ph/cm2/s Energy fluence (15-150 keV) : 6.66482e-07 ( -5.93843e-08 6.06085e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.880 sec. to 26.036 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.79314 ( -0.434237 0.760237 ) Epeak [keV] : 16.3553 ( -15.1425 16.2507 ) Norm@50keV : 4.75730E-03 ( -0.00165132 0.00888673 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.74 using 59 PHA bins. # Reduced chi-squared = 0.8168 for 56 degrees of freedom # Null hypothesis probability = 8.343861e-01 Photon flux (15-150 keV) in 28.92 sec: 0.409027 ( -0.034214 0.017137 ) ph/cm2/s Energy fluence (15-150 keV) : 6.29823e-07 ( -7.1046e-08 7.33764e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 10.708 sec. to 11.708 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.77403 ( -0.333234 0.316713 ) Norm@50keV : 6.52003E-03 ( -0.00131613 0.00127437 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.61 using 59 PHA bins. # Reduced chi-squared = 0.8528 for 57 degrees of freedom # Null hypothesis probability = 7.778578e-01 Photon flux (15-150 keV) in 1 sec: 0.889605 ( -0.155802 0.156035 ) ph/cm2/s Energy fluence (15-150 keV) : 6.00966e-08 ( -1.21707e-08 1.25073e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.708 sec. to 11.708 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.60898 ( -0.778872 1.36542 ) Epeak [keV] : 106.416 ( -91.5328 -106.422 ) Norm@50keV : 8.04149E-03 ( -0.00804135 0.0381264 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.54 using 59 PHA bins. # Reduced chi-squared = 0.8668 for 56 degrees of freedom # Null hypothesis probability = 7.501369e-01 Photon flux (15-150 keV) in 1 sec: 0.883321 ( -0.161405 0.159979 ) ph/cm2/s Energy fluence (15-150 keV) : 5.90799e-08 ( -1.3862e-08 1.33153e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 25.26 sec. Hardness ratio (energy fluence ratio) = 0.821315467692
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.02119e-07 S(50-150 keV) = 2.643583e-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 = -3.589301383745268E-01, IMY = 3.012539309384202E-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: -239.112000 -2.880000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9631 -15.6340 0.3 17.6 -96.5 7.4133 34.5 1.0 Sco X-1 254.5183 35.3052 11.6 50.9 178.0 -0.5469 -1.0 3.7 Her X-1 255.9490 -37.8262 2.0 38.1 -66.5 2.5023 5.7 2.1 4U 1700-377 256.6737 -36.3421 0.0 37.6 -68.9 0.4377 1.0 12.5 GX 349+2 263.2071 -24.6842 37.8 36.8 -90.4 -0.1592 -0.3 11.4 GX 1+4 268.4872 -1.5177 3.1 40.8 -128.2 1.3849 3.7 8.1 SW J1753.5-0127 262.8608 -33.6915 0.0 40.2 -77.0 0.5112 0.8 10.7 GX 354-0 213.9117 -47.2102 2.1 40.0 -14.7 1.4240 5.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -2.880000 19.788600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0063 -15.6116 10.7 17.7 -96.6 0.0617 1.1 2.3 Sco X-1 254.5327 35.4229 5.0 51.0 177.9 0.3261 2.3 6.1 Her X-1 255.9014 -37.7019 4.5 38.0 -66.6 0.3037 2.6 9.4 4U 1700-377 256.6526 -36.3833 26.5 37.6 -68.9 -0.0485 -0.4 10.8 GX 349+2 262.9140 -24.6943 5.5 36.6 -90.2 0.2600 2.1 6.0 GX 1+4 268.3991 -1.5049 13.8 40.7 -128.2 -0.0851 -0.8 3.6 SW J1753.5-0127 263.2004 -33.7833 8.4 40.5 -77.1 0.2780 1.4 11.0 GX 354-0 251.6525 0.0626 0.6 25.1 -140.0 1.0742 18.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 65.588600 962.963000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9839 -15.6414 0.2 17.0 -8.2 29.0078 54.0 0.3 Sco X-1 254.4851 35.3093 11.5 35.3 153.5 0.9558 1.0 2.4 Her X-1 255.9954 -37.8463 0.8 38.1 -36.2 13.0618 14.0 0.4 4U 1700-377 256.5819 -36.3793 3.9 36.8 -37.2 2.4594 3.0 7.5 GX 349+2 263.0055 -24.7400 1.6 27.2 -53.7 4.7436 7.1 0.4 GX 1+4 264.7511 -44.3829 90.9 46.0 -43.6 0.1883 0.1 4.0 4U 1735-44 268.3463 -1.4647 1.4 16.8 -115.2 4.3931 8.1 1.5 SW J1753.5-0127 270.2412 -25.1340 3.1 31.0 -64.7 3.0264 3.7 4.0 GX 5-1 270.3727 -25.8296 6.0 31.6 -64.1 1.6540 1.9 6.4 GRS 1758-258 273.9968 -14.0010 1.6 26.2 -87.2 5.7080 7.3 2.2 GX 17+2 275.8341 -30.3443 5.1 38.2 -65.5 3.0014 2.3 4.9 H1820-303 285.1095 -25.0184 8.2 41.0 -80.3 3.2809 1.4 7.1 HT1900.1-2455 288.7977 10.9650 1.2 38.5 -138.2 8.5641 9.4 1.2 GRS 1915+105 299.6128 35.1877 1.6 56.8 -164.0 16.5298 7.2 1.4 Cyg X-1 262.8164 -33.8736 4.3 35.5 -46.7 2.0063 2.7 8.9 GX 354-0 214.7964 13.8037 3.0 39.0 81.6 10.5867 3.8 ------ UNKNOWN 241.0534 45.1675 3.7 46.0 139.1 8.6581 3.1 ------ UNKNOWN 235.7804 -8.8932 5.0 18.2 29.4 1.3320 2.3 ------ UNKNOWN 237.0105 -28.3248 3.7 31.7 -5.5 2.0637 3.1 ------ UNKNOWN 258.2240 -16.0223 3.0 17.4 -52.3 1.9827 3.9 ------ UNKNOWN