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 15:43:58 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger355942
======================================================================
Trigger: 00355942 Segment: 000
BAT Trigger Time: 267916816.896 [s; MET]
Trigger Stop: 267916817.92 [s; MET]
UTC: 2009-06-28T21:20:12.029720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 237.049710631592 Dec: -15.9769445036211 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.03
Image Trigger?: NO
Rate S/N Ratio: 15.3622914957372 [ if not an image trigger ]
Image S/N Ratio: 10.03
Analysis Position: [ source = BAT ]
RA: 237.049710631592 Dec: -15.9769445036211 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 237.036860994085 Dec: -15.9707594216292 [deg; J2000]
{ 15h 48m 08.8s , -15d 58' 14.7" }
+/- 1.69410512838328 [arcmin] (estimated 90% radius based on SNR)
+/- 0.739441961279157 [arcmin] (formal 1-sigma fit error)
SNR: 14.3238817451087
Angular difference between the analysis and refined position is 0.828921 arcmin
Partial Coding Fraction: 0.6328125 [ including projection effects ]
Duration
T90: 24.944000005722 +/- 4.05342179186581
Measured from: -21.5239999890327
to: 3.4200000166893 [s; relative to TRIGTIME]
T50: 11.1960000097752 +/- 4.42866889265547
Measured from: -9.72799998521805
to: 1.46800002455711 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0520000159740448
to: 1.05200001597404 [s; relative to TRIGTIME]
Total Fluence
Measured from: -25.0920000076294
to: 3.99200001358986 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.272927 0.341130 0.338619 0.113458
0.040571 0.037911 0.032530 0.028177 [error]
Peak 0.039763 0.069436 0.052994 0.009039
0.007970 0.007906 0.007005 0.005711 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 29.084 -25.092 3.992
T90 24.944 -21.524 3.420
T50 11.196 -9.728 1.468
Peak 1.000 0.052 1.052
====== 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 -1.379 -0.196 0.198 - - - 2.49e-03 -2.60e-04 2.60e-04 44.950 57
CPL -1.371 -0.203 0.356 9999.030 -9999.030 -9999.030 2.49e-03 -2.49e-03 1.52e-03 44.970 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 -1.446 -0.221 0.221 - - - 1.20e-02 -1.58e-03 1.58e-03 49.160 57
CPL -0.717 -0.819 1.106 86.862 -27.116 -86.862 2.82e-02 -1.70e-02 7.28e-02 47.170 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 8.25e-08 1.63e-07 2.51e-07 8.44e-07 7.02e-07 1.34e-06 erg/cm2
90%_error_low -1.65e-08 -1.97e-08 -3.29e-08 -2.26e-07 -8.00e-08 -2.50e-07 erg/cm2
90%_error_hi 1.75e-08 1.93e-08 3.25e-08 2.81e-07 8.05e-08 2.94e-07 erg/cm2
Peak flux PL 4.68e-01 4.86e-01 3.57e-01 4.22e-01 1.47e+00 1.73e+00 ph/cm2/s
90%_error_low -1.03e-01 -6.93e-02 -5.77e-02 -1.24e-01 -1.96e-01 -2.29e-01 ph/cm2/s
90%_error_hi 1.10e-01 6.85e-02 5.72e-02 1.53e-01 1.97e-01 2.30e-01 ph/cm2/s
Fluence CPL 8.24e-08 1.62e-07 2.51e-07 9.12e-07 7.06e-07 1.36e-06 erg/cm2
90%_error_low N/A N/A N/A -4.78e-07 N/A -4.60e-07 erg/cm2
90%_error_hi N/A N/A N/A 5.75e-08 N/A 1.06e-07 erg/cm2
Peak flux CPL 4.12e-01 5.20e-01 3.76e-01 1.94e-01 1.43e+00 1.50e+00 ph/cm2/s
90%_error_low -1.22e-01 -8.17e-02 -6.48e-02 -1.19e-01 -2.04e-01 -2.46e-01 ph/cm2/s
90%_error_hi 1.28e-01 8.55e-02 6.65e-02 2.80e-01 2.04e-01 3.49e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 237.0369 -15.9708 0.0134 31.2844 -40.4363 1.0985708 14.324 TRIG_00355942 Foreground time interval of the image: -25.092 3.992 (delta_t = 29.084 [sec]) Background time interval of the image: -239.896 -25.092 (delta_t = 214.804 [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 -25.092 sec. to 3.992 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.3795 ( -0.19625 0.198477 ) Norm@50keV : 2.48626E-03 ( -0.0002598 0.000259618 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 44.95 using 59 PHA bins. # Reduced chi-squared = 0.7886 for 57 degrees of freedom # Null hypothesis probability = 8.761089e-01 Photon flux (15-150 keV) in 29.08 sec: 0.301406 ( -0.033347 0.033481 ) ph/cm2/s Energy fluence (15-150 keV) : 7.01689e-07 ( -7.99552e-08 8.05051e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -25.092 sec. to 3.992 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.37103 ( -0.198696 0.360262 ) Epeak [keV] : 9999.03 ( -9999.36 -9999.36 ) Norm@50keV : 2.49244E-03 ( -0.00249542 0.00152002 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 44.97 using 59 PHA bins. # Reduced chi-squared = 0.8030 for 56 degrees of freedom # Null hypothesis probability = 8.544973e-01 Photon flux (15-150 keV) in 29.08 sec: 0.303678 ( -0.044741 0.04029 ) ph/cm2/s Energy fluence (15-150 keV) : 7.05836e-07 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.052 sec. to 1.052 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.44642 ( -0.221478 0.221175 ) Norm@50keV : 1.19734E-02 ( -0.00158239 0.00157672 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.16 using 59 PHA bins. # Reduced chi-squared = 0.8625 for 57 degrees of freedom # Null hypothesis probability = 7.604187e-01 Photon flux (15-150 keV) in 1 sec: 1.47428 ( -0.19634 0.19685 ) ph/cm2/s Energy fluence (15-150 keV) : 1.14667e-07 ( -1.64877e-08 1.6683e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.052 sec. to 1.052 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.716518 ( -0.818784 1.10592 ) Epeak [keV] : 86.8624 ( -27.1141 -86.8609 ) Norm@50keV : 2.81877E-02 ( -0.016989 0.0728313 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.17 using 59 PHA bins. # Reduced chi-squared = 0.8423 for 56 degrees of freedom # Null hypothesis probability = 7.935652e-01 Photon flux (15-150 keV) in 1 sec: 1.42896 ( -0.20436 0.2044 ) ph/cm2/s Energy fluence (15-150 keV) : 1.08211e-07 ( -1.83689e-08 1.849e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 24.944 sec. Hardness ratio (energy fluence ratio) = 1.53744632727
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.456093e-07 S(50-150 keV) = 4.560813e-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 = 4.624901037000976E-01, IMY = 3.941150020758289E-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: -239.896000 -25.092000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9828 -15.6480 0.3 25.6 -29.5 6.2874 34.2 0.5 Sco X-1 255.9961 -37.8480 3.7 10.3 -100.8 0.5867 3.1 0.5 4U 1700-377 256.4227 -36.4094 4.2 9.4 -94.2 0.5291 2.7 1.0 GX 349+2 263.1038 -24.7919 3.6 8.0 2.3 0.5755 3.3 5.9 GX 1+4 264.7357 -44.2895 4.7 12.2 -148.5 0.4140 2.4 9.6 4U 1735-44 268.3092 -1.4786 3.1 30.8 28.8 0.9363 3.7 3.9 SW J1753.5-0127 270.2738 -25.0657 2.0 7.8 50.9 1.0220 5.8 1.0 GX 5-1 270.2148 -25.7557 2.6 7.2 52.7 0.8128 4.5 4.8 GRS 1758-258 274.1050 -13.9109 6.0 19.5 47.8 0.3563 1.9 9.5 GX 17+2 275.9228 -30.3050 2.5 8.2 104.5 0.7858 4.6 3.7 H1820-303 285.0466 -24.7857 125.3 17.8 95.5 -0.0195 -0.1 8.1 HT1900.1-2455 263.0095 -33.7945 2.7 3.4 -93.9 0.7831 4.3 2.6 GX 354-0 314.7781 -26.7394 2.4 42.0 120.8 3.4014 4.8 ------ UNKNOWN 277.5703 -23.8230 2.4 12.8 77.4 0.8729 4.7 ------ UNKNOWN 249.6566 19.6266 2.7 54.3 5.7 2.9084 4.3 ------ UNKNOWN 255.1453 -41.7102 2.0 13.2 -114.2 1.1641 5.8 ------ UNKNOWN 354.5567 -75.6645 2.6 58.4 -171.5 4.7639 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -25.092000 3.992000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9683 -15.4890 5.2 25.8 -29.3 0.1425 2.2 9.1 Sco X-1 255.8690 -38.0323 0.0 10.5 -101.4 0.0575 1.0 12.6 4U 1700-377 256.3510 -36.6041 5.0 9.5 -95.1 0.1332 2.3 11.6 GX 349+2 262.8451 -24.7758 8.8 8.1 0.7 0.0732 1.3 9.1 GX 1+4 264.8061 -44.2675 5.5 12.1 -148.7 -0.1207 -2.1 11.3 4U 1735-44 268.2219 -1.4669 5.8 30.8 28.6 -0.1511 -2.0 8.8 SW J1753.5-0127 270.3302 -25.0987 5.9 7.8 51.3 -0.1077 -1.9 2.8 GX 5-1 270.2703 -25.8046 3.5 7.2 53.3 -0.1871 -3.3 4.1 GRS 1758-258 273.9427 -14.2229 4.8 19.2 47.6 0.1592 2.4 11.8 GX 17+2 275.9957 -30.5034 10.0 8.2 106.0 -0.0628 -1.1 9.0 H1820-303 285.0619 -25.0221 6.6 17.7 96.2 0.1131 1.7 6.3 HT1900.1-2455 262.7917 -33.7425 3.8 3.5 -91.8 -0.1777 -3.1 11.3 GX 354-0 237.0369 -15.9708 0.8 31.3 -40.4 1.0988 14.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 194.604600 882.804600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.3121 -60.6244 4.1 42.8 -25.1 1.8090 2.8 0.1 Cen X-3 186.6338 -62.8007 2.2 38.9 -14.4 2.8956 5.4 1.9 GX 301-2 264.7477 -44.5013 11.4 39.2 62.9 1.2507 1.0 3.1 4U 1735-44 296.1963 -36.8415 3.0 40.4 102.2 6.0122 3.9 ------ UNKNOWN 353.6936 -53.3783 3.3 25.2 -178.0 1.4112 3.5 ------ UNKNOWN 27.8627 -38.5963 3.0 46.8 -147.3 3.6466 3.8 ------ UNKNOWN