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: Mon Jan 20 09:36:20 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger279817
======================================================================
Trigger: 00279817 Segment: 000
BAT Trigger Time: 201359112 [s; MET]
Trigger Stop: 201359200 [s; MET]
UTC: 2007-05-20T13:05:10.032620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 193.315762479148 Dec: 74.9932499437833 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.99
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.99
Analysis Position: [ source = BAT ]
RA: 193.315762479148 Dec: 74.9932499437833 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 193.246676731048 Dec: 74.9823607272786 [deg; J2000]
{ 12h 52m 59.2s , +74d 58' 56.5" }
+/- 2.29381524787782 [arcmin] (estimated 90% radius based on SNR)
+/- 1.23342792493352 [arcmin] (formal 1-sigma fit error)
SNR: 9.29041043723796
Angular difference between the analysis and refined position is 1.256857 arcmin
Partial Coding Fraction: 0.671875 [ including projection effects ]
Duration
T90: 48 +/- 22.6274169979695
Measured from: 17
to: 65 [s; relative to TRIGTIME]
T50: 16 +/- 22.6274169979695
Measured from: 33
to: 49 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 40.5
to: 41.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: 17
to: 65 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.180775 0.253577 0.190244 -0.035764
0.039642 0.040868 0.035558 0.030616 [error]
Peak 0.010961 0.012986 0.001422 0.008705
0.005768 0.005922 0.005222 0.004378 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 48.000 17.000 65.000
T90 48.000 17.000 65.000
T50 16.000 33.000 49.000
Peak 1.000 40.500 41.500
====== 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 -1.687 -0.314 0.296 - - - 8.57e-04 -1.75e-04 1.71e-04 82.960 57
CPL -0.286 -1.217 1.640 60.264 -15.095 68.505 4.45e-03 -4.45e-03 2.35e-02 78.940 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 -2.395 -2.177 1.272 - - - 1.29e-03 -1.29e-03 1.32e-03 38.320 57
CPL -1.868 N/A N/A 7.552 N/A N/A 3.02e-03 N/A N/A 38.360 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 6.26e-08 1.03e-07 1.27e-07 3.14e-07 3.81e-07 6.07e-07 erg/cm2
90%_error_low -1.64e-08 -1.89e-08 -3.36e-08 -1.39e-07 -8.02e-08 -1.79e-07 erg/cm2
90%_error_hi 1.74e-08 1.89e-08 3.39e-08 1.94e-07 8.21e-08 2.22e-07 erg/cm2
Peak flux PL 1.27e-01 7.55e-02 2.87e-02 1.46e-02 2.39e-01 2.45e-01 ph/cm2/s
90%_error_low -8.89e-02 -7.55e-02 -2.87e-02 -1.46e-02 -1.43e-01 -1.48e-01 ph/cm2/s
90%_error_hi 9.20e-02 5.00e-02 4.45e-02 8.07e-02 1.44e-01 1.54e-01 ph/cm2/s
Fluence CPL 5.01e-08 1.19e-07 1.39e-07 7.10e-08 3.57e-07 3.77e-07 erg/cm2
90%_error_low -2.02e-08 -2.37e-08 -3.98e-08 -5.21e-08 -7.75e-08 -9.26e-08 erg/cm2
90%_error_hi 2.07e-08 2.48e-08 4.07e-08 1.81e-07 8.29e-08 1.88e-07 erg/cm2
Peak flux CPL 1.20e-01 6.02e-02 1.94e-02 9.58e-03 2.05e-01 2.13e-01 ph/cm2/s
90%_error_low -1.01e-01 -6.02e-02 -1.94e-02 N/A -2.05e-01 N/A ph/cm2/s
90%_error_hi 9.72e-02 1.12e-01 5.32e-02 N/A 1.75e-01 N/A ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 193.2467 74.9824 0.0208 30.0333 -139.1017 0.7066714 9.290 TRIG_00279817 Foreground time interval of the image: 17.000 65.000 (delta_t = 48.000 [sec]) Background time interval of the image: -239.000 17.000 (delta_t = 256.000 [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 17.000 sec. to 65.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.68686 ( -0.314407 0.296093 ) Norm@50keV : 8.56514E-04 ( -0.000174809 0.00017127 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 82.96 using 59 PHA bins. # Reduced chi-squared = 1.455 for 57 degrees of freedom # Null hypothesis probability = 1.398058e-02 Photon flux (15-150 keV) in 48 sec: 0.113241 ( -0.0208666 0.020884 ) ph/cm2/s Energy fluence (15-150 keV) : 3.81128e-07 ( -8.02152e-08 8.2128e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.000 sec. to 65.000 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.2864 ( -1.21252 1.64508 ) Epeak [keV] : 60.2639 ( -15.1482 68.4521 ) Norm@50keV : 4.45373E-03 ( -0.00443099 0.0235248 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 78.94 using 59 PHA bins. # Reduced chi-squared = 1.410 for 56 degrees of freedom # Null hypothesis probability = 2.338838e-02 Photon flux (15-150 keV) in 48 sec: 0.108143 ( -0.0212538 0.021387 ) ph/cm2/s Energy fluence (15-150 keV) : 3.56715e-07 ( -7.74984e-08 8.28686e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 40.500 sec. to 41.500 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.39475 ( -2.17692 1.27189 ) Norm@50keV : 1.29292E-03 ( -0.00129292 0.00131773 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 38.32 using 59 PHA bins. # Reduced chi-squared = 0.6723 for 57 degrees of freedom # Null hypothesis probability = 9.727926e-01 Photon flux (15-150 keV) in 1 sec: 0.238518 ( -0.142601 0.143539 ) ph/cm2/s Energy fluence (15-150 keV) : 1.26e-08 ( -8.83123e-09 1.15413e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 40.500 sec. to 41.500 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.86816 ( ) Epeak [keV] : 7.55164 ( ) Norm@50keV : 3.02354E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 38.36 using 59 PHA bins. # Reduced chi-squared = 0.6851 for 56 degrees of freedom # Null hypothesis probability = 9.654584e-01 Photon flux (15-150 keV) in 1 sec: 0.204819 ( -0.204819 0.175445 ) ph/cm2/s Energy fluence (15-150 keV) : 9.94008e-09 ( 0 0 ) 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 = -4.369901669129268E-01, IMY = 3.785099723256006E-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: -239.000000 17.000000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4170 35.3298 0.8 20.0 67.3 2.7174 13.8 2.1 Her X-1 288.7710 10.9553 3.1 51.9 22.8 3.0028 3.8 1.7 GRS 1915+105 299.5847 35.1981 0.5 36.8 -8.3 5.6384 24.8 0.3 Cyg X-1 308.1722 40.8349 6.2 37.7 -22.8 -0.4460 -1.9 7.6 Cyg X-3 326.0246 38.4219 0.0 49.4 -33.8 -0.7433 -1.4 9.2 Cyg X-2 308.0445 37.6203 1.3 39.8 -18.9 2.1668 8.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 17.000000 65.000000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4705 35.1791 55.7 20.1 67.2 0.0163 0.2 9.8 Her X-1 288.9143 10.9140 9.1 52.0 22.7 -0.4247 -1.3 7.1 GRS 1915+105 299.5744 35.1551 3.0 36.8 -8.2 -0.3273 -3.8 2.9 Cyg X-1 308.0993 41.1117 4.1 37.5 -23.0 -0.2342 -2.8 9.6 Cyg X-3 326.1607 38.2053 11.9 49.7 -33.7 -0.1802 -1.0 7.0 Cyg X-2 171.4607 45.2101 2.3 50.6 -176.9 0.8019 5.1 ------ UNKNOWN 308.4216 38.8659 2.6 39.2 -20.6 0.3988 4.5 ------ UNKNOWN 193.2466 74.9823 1.3 30.0 -139.1 0.7063 9.3 ------ UNKNOWN 335.5364 62.0106 2.5 40.0 -65.9 0.7912 4.7 ------ UNKNOWN 108.8526 77.3601 2.4 45.6 -122.2 1.3191 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 147.500590 244.900600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 46.7524 66.4354 3.5 37.0 -70.5 0.6918 3.3 ------ UNKNOWN 108.4683 41.7005 2.9 48.7 -130.7 1.7743 4.0 ------ UNKNOWN