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: Wed Jan 22 20:10:23 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger155408
======================================================================
Trigger: 00155408 Segment: 000
BAT Trigger Time: 148581352 [s; MET]
Trigger Stop: 148581472 [s; MET]
UTC: 2005-09-16T16:35:52.267640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 135.992250681767 Dec: -51.4255835934932 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.77
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.77
Analysis Position: [ source = BAT ]
RA: 135.992250681767 Dec: -51.4255835934932 [deg; J2000]
Refined Position: [ source = BAT pre-slew image ]
RA: 136.007745125 Dec: -51.4051369862 [deg; J2000]
{ 09h 04m 01.9s , -51d -24' -18.5" }
+/- 2.08730754188 [arcmin] (estimated 90% radius based on SNR)
SNR: 10.632199995
Angular difference between the analysis and refined position is 1.356910 arcmin
Partial Coding Fraction: 0.4179688 [ including projection effects ]
Duration
T90: 85.1840000152588 +/- 12.7242994355077
Measured from: 11.4560000002384
to: 96.6400000154972 [s; relative to TRIGTIME]
T50: 32.8960000276566 +/- 22.1224316868661
Measured from: 25.419999986887
to: 58.3160000145435 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 43.7199999988079
to: 44.7199999988079 [s; relative to TRIGTIME]
Total Fluence
Measured from: 7.38400000333786
to: 105.615999996662 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.565474 0.778072 0.377587 0.119276
0.079290 0.081186 0.071007 0.064000 [error]
Peak 0.018843 0.029143 0.020229 0.013180
0.008177 0.008702 0.007838 0.006720 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 98.232 7.384 105.616
T90 85.184 11.456 96.640
T50 32.896 25.420 58.316
Peak 1.000 43.720 44.720
====== 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 -1.794 -0.229 0.220 - - - 1.25e-03 -1.80e-04 1.76e-04 61.550 57
CPL -0.930 -0.987 1.503 54.657 -14.227 -54.657 3.77e-03 -3.77e-03 2.25e-02 59.690 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 -1.474 -0.560 0.567 - - - 5.38e-03 -1.77e-03 1.75e-03 58.260 57
CPL -0.861 -1.310 4.215 88.502 -88.502 -88.502 1.14e-02 -1.14e-02 1.53e+00 58.110 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 2.07e-07 3.18e-07 3.67e-07 8.12e-07 1.13e-06 1.70e-06 erg/cm2
90%_error_low -3.95e-08 -4.08e-08 -6.96e-08 -2.75e-07 -1.64e-07 -3.51e-07 erg/cm2
90%_error_hi 4.11e-08 4.07e-08 7.00e-08 3.54e-07 1.66e-07 4.12e-07 erg/cm2
Peak flux PL 2.16e-01 2.21e-01 1.59e-01 1.83e-01 6.67e-01 7.78e-01 ph/cm2/s
90%_error_low -1.11e-01 -7.96e-02 -6.33e-02 -1.13e-01 -2.22e-01 -2.53e-01 ph/cm2/s
90%_error_hi 1.28e-01 7.70e-02 6.19e-02 1.87e-01 2.23e-01 2.55e-01 ph/cm2/s
Fluence CPL 1.88e-07 3.52e-07 3.64e-07 2.29e-07 1.05e-06 1.13e-06 erg/cm2
90%_error_low -4.76e-08 -4.97e-08 -8.78e-08 -1.82e-07 -1.91e-07 N/A erg/cm2
90%_error_hi 4.73e-08 6.24e-08 7.93e-08 6.81e-07 1.98e-07 N/A erg/cm2
Peak flux CPL 1.98e-01 2.36e-01 1.65e-01 9.03e-02 6.54e-01 6.89e-01 ph/cm2/s
90%_error_low -1.38e-01 -9.26e-02 N/A -9.03e-02 -2.35e-01 -2.69e-01 ph/cm2/s
90%_error_hi 1.42e-01 1.10e-01 N/A 1.30e-01 2.29e-01 2.71e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 136.008 -51.405 0.018 41.407 -145.312 1.941 10.632 TRIG_00155408 Image time interval: 0.000 to 120.000 [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 7.384 sec. to 105.616 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.79431 ( -0.228971 0.220187 ) Norm@50keV : 1.25148E-03 ( -0.000179721 0.000176454 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.55 using 59 PHA bins. # Reduced chi-squared = 1.080 for 57 degrees of freedom # Null hypothesis probability = 3.165263e-01 Photon flux (15-150 keV) in 98.23 sec: 0.172081 ( -0.022265 0.022293 ) ph/cm2/s Energy fluence (15-150 keV) : 1.13212e-06 ( -1.63945e-07 1.66446e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.384 sec. to 105.616 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.92987 ( -0.987465 1.50275 ) Epeak [keV] : 54.6574 ( -14.2136 -54.644 ) Norm@50keV : 3.77472E-03 ( -0.00377929 0.0224942 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.69 using 59 PHA bins. # Reduced chi-squared = 1.066 for 56 degrees of freedom # Null hypothesis probability = 3.432235e-01 Photon flux (15-150 keV) in 98.23 sec: 0.166418 ( -0.02374 0.023498 ) ph/cm2/s Energy fluence (15-150 keV) : 1.04622e-06 ( -1.91025e-07 1.97821e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 43.720 sec. to 44.720 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.47415 ( -0.55993 0.567032 ) Norm@50keV : 5.37725E-03 ( -0.00177269 0.00175438 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.26 using 59 PHA bins. # Reduced chi-squared = 1.022 for 57 degrees of freedom # Null hypothesis probability = 4.286962e-01 Photon flux (15-150 keV) in 1 sec: 0.666753 ( -0.221778 0.223147 ) ph/cm2/s Energy fluence (15-150 keV) : 5.12401e-08 ( -1.78975e-08 1.82911e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 43.720 sec. to 44.720 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.861071 ( -1.30778 4.21718 ) Epeak [keV] : 88.5025 ( -88.7399 -88.7399 ) Norm@50keV : 1.13656E-02 ( -0.0113152 1.5302 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.11 using 59 PHA bins. # Reduced chi-squared = 1.038 for 56 degrees of freedom # Null hypothesis probability = 3.974961e-01 Photon flux (15-150 keV) in 1 sec: 0.653873 ( -0.23514 0.229409 ) ph/cm2/s Energy fluence (15-150 keV) : 4.87158e-08 ( -2.02987e-08 1.998e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 85.184 sec. Hardness ratio (energy fluence ratio) = 1.15324061208
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.251642e-07 S(50-150 keV) = 6.069695e-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 = -0.725101197699, IMY = 0.501860005705
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: -6.299400 7.384000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5686 -40.5039 6.6 50.8 -137.6 -0.2852 -1.7 3.6 Vela X-1 170.4491 -60.7096 5.1 21.7 -130.6 0.0797 2.3 6.5 Cen X-3 186.4556 -62.7532 3.7 14.4 -121.6 0.1008 3.1 5.6 GX 301-2 244.8821 -15.6442 6.2 54.4 -3.9 0.1926 1.9 5.6 Sco X-1 255.8558 -37.8425 6.1 35.9 18.7 0.0912 1.9 6.2 4U 1700-377 256.4359 -36.4989 191.3 37.3 18.5 0.0030 0.1 4.6 GX 349+2 263.1035 -24.7388 6.3 50.4 20.0 0.2163 1.8 5.2 GX 1+4 264.5433 -44.4062 13.0 33.0 34.2 -0.0414 -0.9 8.9 4U 1735-44 270.2337 -25.7467 4.2 51.8 28.2 0.4430 2.8 3.7 GRS 1758-258 275.8730 -30.4070 6.8 49.5 36.6 0.2774 1.7 3.6 H1820-303 263.1258 -33.8899 10.3 41.9 24.8 0.0706 1.1 7.6 GX 354-0 230.7250 -70.1032 3.3 5.0 93.3 0.1139 3.5 ------ UNKNOWN 98.1856 -49.1335 2.2 55.3 -171.8 0.5673 5.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 7.384000 105.616000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5385 -40.5358 5.2 50.8 -137.6 2.7770 2.2 1.2 Vela X-1 170.6316 -60.6828 4.8 21.6 -130.3 -0.6512 -2.4 10.0 Cen X-3 186.3250 -62.7361 4.6 14.4 -121.6 -0.5883 -2.5 9.3 GX 301-2 244.8765 -15.6603 6.9 54.4 -3.9 -1.2802 -1.7 6.1 Sco X-1 256.0047 -37.7791 30.5 36.0 18.8 0.1376 0.4 4.0 4U 1700-377 256.3599 -36.2663 25.0 37.5 18.2 0.1740 0.5 10.1 GX 349+2 263.0396 -24.8892 12.2 50.2 20.0 -0.8336 -0.9 8.8 GX 1+4 264.5382 -44.3826 6.2 33.0 34.2 0.6765 1.8 9.7 4U 1735-44 270.2682 -25.7571 4.7 51.8 28.3 -2.8943 -2.5 2.0 GRS 1758-258 275.8498 -30.4219 6.4 49.5 36.5 -2.1551 -1.8 5.1 H1820-303 263.1318 -33.8220 24.5 42.0 24.7 -0.2191 -0.5 7.2 GX 354-0 82.7555 -51.2738 2.6 56.9 176.2 6.5271 4.4 ------ UNKNOWN 190.2724 -29.1614 2.9 42.0 -74.0 3.9208 4.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 193.500590 303.096300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4873 -40.5490 1.5 10.9 -136.3 0.7110 7.9 1.9 Vela X-1 170.2854 -60.5128 3.9 20.9 -5.1 0.2988 3.0 6.7 Cen X-3 186.7519 -62.8892 5.2 28.9 -1.1 0.2665 2.2 7.6 GX 301-2 78.9403 -71.6009 2.4 31.9 75.9 0.8806 4.7 ------ UNKNOWN 95.7865 -28.8519 2.3 37.4 157.3 0.7803 4.9 ------ UNKNOWN 201.3460 -32.8782 2.9 50.0 -39.3 1.5033 4.0 ------ UNKNOWN