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 18:49:10 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger177666
======================================================================
Trigger: 00177666 Segment: 000
BAT Trigger Time: 159173402.56 [s; MET]
Trigger Stop: 159173403.584 [s; MET]
UTC: 2006-01-17T06:50:01.599700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 327.926469426567 Dec: -59.9805138823269 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 24.66
Image Trigger?: NO
Rate S/N Ratio: 217.575274330518 [ if not an image trigger ]
Image S/N Ratio: 24.66
Analysis Position: [ source = BAT ]
RA: 327.926469426567 Dec: -59.9805138823269 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 327.911939614673 Dec: -59.9814227366426 [deg; J2000]
{ 21h 51m 38.9s , -59d 58' 53.1" }
+/- 0.634941450102031 [arcmin] (estimated 90% radius based on SNR)
+/- 0.194003794124425 [arcmin] (formal 1-sigma fit error)
SNR: 58.2005929462861
Angular difference between the analysis and refined position is 0.439541 arcmin
Partial Coding Fraction: 0.2539062 [ including projection effects ]
Duration
T90: 16.8519999980927 +/- 0.143387570436235
Measured from: 0.120000004768372
to: 16.972000002861 [s; relative to TRIGTIME]
T50: 9.95600003004074 +/- 0.361707071753343
Measured from: 3.16799998283386
to: 13.1240000128746 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 11.1439999938011
to: 12.1439999938011 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.97200000286102
to: 26.2879999876022 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 8.900266 12.347206 8.242409 1.944662
0.090123 0.101377 0.087486 0.059684 [error]
Peak 1.206265 1.959037 1.711041 0.424541
0.028262 0.035764 0.034266 0.020155 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 28.260 -1.972 26.288
T90 16.852 0.120 16.972
T50 9.956 3.168 13.124
Peak 1.000 11.144 12.144
====== 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 -1.883 -0.028 0.028 - - - 8.06e-02 -1.23e-03 1.23e-03 73.170 57
CPL -1.513 -0.117 0.120 78.241 -6.437 10.306 1.16e-01 -1.22e-02 1.40e-02 42.940 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
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 -1.560 -0.039 0.039 - - - 3.98e-01 -9.20e-03 9.20e-03 98.940 57
CPL -0.937 -0.171 0.176 100.914 -10.244 16.368 7.41e-01 -1.13e-01 1.38e-01 56.740 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 4.17e-06 6.08e-06 6.59e-06 1.34e-05 2.10e-05 3.02e-05 erg/cm2
90%_error_low -1.34e-07 -1.16e-07 -1.11e-07 -4.99e-07 -3.19e-07 -5.53e-07 erg/cm2
90%_error_hi 1.36e-07 1.16e-07 1.10e-07 5.11e-07 3.19e-07 5.59e-07 erg/cm2
Peak flux PL 1.74e+01 1.69e+01 1.14e+01 1.21e+01 5.05e+01 5.78e+01 ph/cm2/s
90%_error_low -7.79e-01 -4.72e-01 -2.94e-01 -6.33e-01 -1.33e+00 -1.35e+00 ph/cm2/s
90%_error_hi 7.94e-01 4.71e-01 2.94e-01 6.51e-01 1.34e+00 1.35e+00 ph/cm2/s
Fluence CPL N/A N/A N/A N/A N/A N/A erg/cm2
90%_error_low -1.34e-07 -1.16e-07 -1.11e-07 -4.99e-07 -3.19e-07 -5.53e-07 erg/cm2
90%_error_hi 1.36e-07 1.16e-07 1.10e-07 5.11e-07 3.19e-07 5.59e-07 erg/cm2
Peak flux CPL 1.45e+01 1.72e+01 1.24e+01 7.75e+00 4.85e+01 5.19e+01 ph/cm2/s
90%_error_low -1.01e+00 -5.04e-01 -3.90e-01 -8.65e-01 -1.41e+00 -1.75e+00 ph/cm2/s
90%_error_hi 1.03e+00 5.05e-01 3.93e-01 9.87e-01 1.41e+00 1.81e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 327.9119 -59.9814 0.0033 50.1207 -159.0268 33.2103911 58.201 TRIG_00177666 Foreground time interval of the image: -1.972 26.288 (delta_t = 28.260 [sec]) Background time interval of the image: -299.560 -1.972 (delta_t = 297.588 [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 -1.972 sec. to 26.288 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.88299 ( -0.0277571 0.027773 ) Norm@50keV : 8.06479E-02 ( -0.00122792 0.00122749 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 73.17 using 59 PHA bins. # Reduced chi-squared = 1.284 for 57 degrees of freedom # Null hypothesis probability = 7.324733e-02 Photon flux (15-150 keV) in 28.26 sec: 11.4919 ( -0.2354 0.2366 ) ph/cm2/s Energy fluence (15-150 keV) : 2.09552e-05 ( -3.19375e-07 3.18934e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.972 sec. to 26.288 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.51305 ( -0.117244 0.119999 ) Epeak [keV] : 78.2412 ( -6.4372 10.3061 ) Norm@50keV : 0.115634 ( -0.0122 0.0139569 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 42.94 using 59 PHA bins. # Reduced chi-squared = 0.7668 for 56 degrees of freedom # Null hypothesis probability = 8.999545e-01 Photon flux (15-150 keV) in 28.26 sec: 11.0139 ( -0.2692 0.2719 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 11.144 sec. to 12.144 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.56045 ( -0.0392647 0.0391882 ) Norm@50keV : 0.398031 ( -0.00919793 0.00919712 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 98.94 using 59 PHA bins. # Reduced chi-squared = 1.736 for 57 degrees of freedom # Null hypothesis probability = 4.824482e-04 Photon flux (15-150 keV) in 1 sec: 50.5436 ( -1.3331 1.3369 ) ph/cm2/s Energy fluence (15-150 keV) : 3.74214e-06 ( -8.7707e-08 8.76063e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.144 sec. to 12.144 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.936926 ( -0.170521 0.176417 ) Epeak [keV] : 100.914 ( -10.2439 16.3676 ) Norm@50keV : 0.740831 ( -0.11301 0.138092 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.74 using 59 PHA bins. # Reduced chi-squared = 1.013 for 56 degrees of freedom # Null hypothesis probability = 4.472638e-01 Photon flux (15-150 keV) in 1 sec: 48.4879 ( -1.4058 1.4142 ) ph/cm2/s Energy fluence (15-150 keV) : 3.67993e-06 ( -9.02974e-08 9.02319e-08 ) 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 = -1.117570735384882E+00, IMY = 4.283949195744891E-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: -299.560000 -1.972000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 326.0515 38.3666 16.5 55.0 -14.4 -0.4413 -0.7 6.3 Cyg X-2 18.9882 4.4022 2.1 34.3 70.0 2.2628 5.5 ------ UNKNOWN 358.8312 -0.8988 3.1 15.1 48.9 0.6392 3.7 88.5 UNKNOWN 308.6515 19.3117 3.1 50.7 -44.5 3.6292 3.7 ------ UNKNOWN 306.8289 -16.3051 3.9 40.9 -93.3 2.6662 3.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.972000 26.288000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 326.1778 38.3864 6.5 55.0 -14.3 -0.6003 -1.8 3.9 Cyg X-2 12.2670 -50.7646 3.1 42.9 165.8 1.2101 3.8 ------ UNKNOWN 0.4739 -53.5165 2.8 42.2 177.2 1.3006 4.1 ------ UNKNOWN 327.9119 -59.9814 0.2 50.1 -159.0 33.2071 58.2 ------ UNKNOWN 307.6651 -40.0867 2.5 45.6 -127.6 3.2634 4.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: