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: Sat Oct 4 21:22:14 EDT 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger605612
======================================================================
Trigger: 00605612 Segment: 000
BAT Trigger Time: 427442047.488 [s; MET]
Trigger Stop: 427442048.512 [s; MET]
UTC: 2014-07-19T05:53:55.204500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 171.592074083928 Dec: -50.1345189156071 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.92
Image Trigger?: NO
Rate S/N Ratio: 7.14142842854285 [ if not an image trigger ]
Image S/N Ratio: 6.92
Analysis Position: [ source = BAT ]
RA: 171.592074083928 Dec: -50.1345189156071 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 171.580060469295 Dec: -50.1191312383103 [deg; J2000]
{ 11h 26m 19.2s , -50d 07' 08.9" }
+/- 2.3789060405975 [arcmin] (estimated 90% radius based on SNR)
+/- 1.45832739762286 [arcmin] (formal 1-sigma fit error)
SNR: 8.81934919385823
Angular difference between the analysis and refined position is 1.032451 arcmin
Partial Coding Fraction: 0.7578125 [ including projection effects ]
Duration
T90: 48 +/- 22.6274169979695
Measured from: -31.4879999756813
to: 16.5120000243187 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: -15.4879999756813
to: 0.512000024318695 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.0120000243187
to: 9.0120000243187 [s; relative to TRIGTIME]
Total Fluence
Measured from: -31.4879999756813
to: 16.5120000243187 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.243664 0.329950 0.194562 0.028010
0.042858 0.044288 0.038788 0.035133 [error]
Peak 0.018118 0.001720 0.003772 0.000967
0.006154 0.006363 0.005620 0.005384 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 48.000 -31.488 16.512
T90 48.000 -31.488 16.512
T50 16.000 -15.488 0.512
Peak 1.000 8.012 9.012
====== 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: N/A)
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 -1.783 -0.290 0.273 - - - 1.02e-03 -1.92e-04 1.87e-04 72.460 57
CPL -0.864 -1.149 1.536 53.796 -12.179 -53.796 3.36e-03 -3.36e-03 2.16e-02 70.670 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
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 -2.633 -3.266 2.023 - - - 7.24e-04 -7.24e-04 1.24e-03 60.340 57
CPL 4.650 -4.289 -4.650 21.467 -4.239 6.073 4.71e+02 -4.71e+02 1.51e+08 57.940 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 8.18e-08 1.26e-07 1.47e-07 3.29e-07 4.52e-07 6.84e-07 erg/cm2
90%_error_low -1.86e-08 -2.02e-08 -3.62e-08 -1.38e-07 -8.52e-08 -1.81e-07 erg/cm2
90%_error_hi 1.94e-08 2.02e-08 3.69e-08 1.91e-07 8.74e-08 2.23e-07 erg/cm2
Peak flux PL 8.92e-02 4.70e-02 1.50e-02 6.43e-03 1.55e-01 1.57e-01 ph/cm2/s
90%_error_low -8.92e-02 -4.70e-02 -1.50e-02 -6.43e-03 -1.47e-01 -1.57e-01 ph/cm2/s
90%_error_hi 9.16e-02 5.14e-02 3.85e-02 5.55e-02 1.50e-01 1.58e-01 ph/cm2/s
Fluence CPL 7.47e-08 1.41e-07 1.45e-07 8.49e-08 4.16e-07 4.46e-07 erg/cm2
90%_error_low -2.15e-08 -2.75e-08 -4.47e-08 -6.98e-08 -8.99e-08 -1.17e-07 erg/cm2
90%_error_hi 2.16e-08 2.91e-08 4.18e-08 2.99e-07 9.77e-08 3.22e-07 erg/cm2
Peak flux CPL 1.57e-01 4.29e-02 8.60e-06 1.82e-13 1.87e-01 1.84e-01 ph/cm2/s
90%_error_low -1.06e-01 -4.29e-02 -8.60e-06 -1.82e-13 -1.15e-01 -1.12e-01 ph/cm2/s
90%_error_hi 1.00e-01 6.81e-02 1.12e-02 -1.82e-13 1.42e-01 1.45e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 171.5801 -50.1191 0.0218 32.4541 -12.8752 0.7469127 8.819 TRIG_00605612 Foreground time interval of the image: -31.488 11.213 (delta_t = 42.701 [sec]) Background time interval of the image: -239.488 -31.488 (delta_t = 208.000 [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 -31.488 sec. to 16.512 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.78316 ( -0.289808 0.273462 ) Norm@50keV : 1.02209E-03 ( -0.000191886 0.000186917 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 72.46 using 59 PHA bins. # Reduced chi-squared = 1.271 for 57 degrees of freedom # Null hypothesis probability = 8.138483e-02 Photon flux (15-150 keV) in 48 sec: 0.139941 ( -0.022453 0.02246 ) ph/cm2/s Energy fluence (15-150 keV) : 4.52024e-07 ( -8.51712e-08 8.73643e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -31.488 sec. to 16.512 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.864242 ( -1.14854 1.53637 ) Epeak [keV] : 53.7957 ( -12.179 -53.7957 ) Norm@50keV : 3.35927E-03 ( -0.00335927 0.0215643 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 70.67 using 59 PHA bins. # Reduced chi-squared = 1.262 for 56 degrees of freedom # Null hypothesis probability = 8.973064e-02 Photon flux (15-150 keV) in 48 sec: 0.135745 ( -0.023043 0.023074 ) ph/cm2/s Energy fluence (15-150 keV) : 4.1572e-07 ( -8.98752e-08 9.76862e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 8.012 sec. to 9.012 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.63313 ( -3.30834 1.98122 ) Norm@50keV : 7.23527E-04 ( -0.000724627 0.00124275 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.34 using 59 PHA bins. # Reduced chi-squared = 1.059 for 57 degrees of freedom # Null hypothesis probability = 3.561205e-01 Photon flux (15-150 keV) in 1 sec: 0.155485 ( -0.146969 0.149581 ) ph/cm2/s Energy fluence (15-150 keV) : 7.57722e-09 ( -7.22808e-09 1.05091e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.012 sec. to 9.012 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 10 ( -9.63911 -10 ) Epeak [keV] : 21.7018 ( -4.47494 5.83726 ) Norm@50keV : 1.02015E+07 ( -1.01954e+07 1.40993e+08 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.55 using 59 PHA bins. # Reduced chi-squared = 1.010 for 56 degrees of freedom # Null hypothesis probability = 4.542137e-01 Photon flux (15-150 keV) in 1 sec: 0.186870 ( -0.114523 0.141745 ) ph/cm2/s Energy fluence (15-150 keV) : 6.50714e-09 ( -4.01421e-09 5.27489e-09 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
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 = 6.199548820325247E-01, IMY = 1.417062486558648E-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: -239.488000 -31.488000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5268 -40.5527 0.6 32.4 -64.1 4.4282 18.6 0.1 Vela X-1 170.3726 -60.4472 11.8 23.5 -1.6 -0.1682 -1.0 10.7 Cen X-3 186.7827 -62.7146 3.9 27.0 15.8 0.5484 3.0 4.8 GX 301-2 336.5273 -65.5658 3.0 40.3 112.5 2.9988 3.9 ------ UNKNOWN 35.1174 -43.1255 2.4 46.9 169.3 1.9452 4.8 ------ UNKNOWN 42.0333 -37.4893 2.4 49.8 178.9 1.9849 4.7 ------ UNKNOWN 60.7322 -40.0711 2.9 41.6 -163.9 1.0025 3.9 ------ UNKNOWN 71.0940 -22.4715 3.2 55.3 -144.8 4.1198 3.7 ------ UNKNOWN 157.8531 -24.7993 3.2 52.1 -42.2 3.2112 3.6 ------ UNKNOWN 152.4037 -26.2334 2.9 49.5 -47.9 3.1590 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -31.488000 11.212600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.3619 -40.5905 6.4 32.3 -64.3 0.1827 1.8 7.9 Vela X-1 170.7291 -60.6022 0.0 23.5 -1.0 -0.1557 -2.2 12.2 Cen X-3 186.2604 -62.8436 0.0 26.7 15.6 0.1883 2.2 11.7 GX 301-2 171.5801 -50.1191 1.3 32.5 -12.9 0.7470 8.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 63.212590 962.584300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5419 -40.5585 0.3 26.8 -124.3 22.2484 41.0 0.6 Vela X-1 170.3349 -60.8313 0.0 10.7 142.1 -0.5006 -1.0 12.5 Cen X-3 186.7797 -62.7053 2.5 15.0 111.2 2.5338 4.7 5.2 GX 301-2 131.9492 -45.6880 2.8 26.6 -137.1 2.2664 4.2 ------ UNKNOWN 80.7942 -41.9696 4.3 59.6 -161.7 15.3895 2.7 ------ UNKNOWN