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 04:34:11 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger302888
======================================================================
Trigger: 00302888 Segment: 000
BAT Trigger Time: 224322608 [s; MET]
Trigger Stop: 224322688 [s; MET]
UTC: 2008-02-10T07:50:05.435780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 251.269750345052 Dec: 13.8302696590224 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 17.85
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 17.85
Analysis Position: [ source = BAT ]
RA: 251.269750345052 Dec: 13.8302696590224 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 251.260042347957 Dec: 13.8246798058874 [deg; J2000]
{ 16h 45m 02.4s , +13d 49' 28.8" }
+/- 1.04893127348964 [arcmin] (estimated 90% radius based on SNR)
+/- 0.384236052001109 [arcmin] (formal 1-sigma fit error)
SNR: 28.4105577698154
Angular difference between the analysis and refined position is 0.657564 arcmin
Partial Coding Fraction: 0.734375 [ including projection effects ]
Duration
T90: 42.2639999985695 +/- 11.3673740317139
Measured from: -9.96799999475479
to: 32.2960000038147 [s; relative to TRIGTIME]
T50: 11.8039999902248 +/- 2.08513694431325
Measured from: -0.0839999914169312
to: 11.7199999988079 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.50400000810623
to: 5.50400000810623 [s; relative to TRIGTIME]
Total Fluence
Measured from: -14.2639999985695
to: 46.0239999890327 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.946831 1.184332 0.731852 0.245239
0.050404 0.053645 0.049398 0.049587 [error]
Peak 0.045826 0.066274 0.066179 0.017083
0.006916 0.007754 0.007278 0.006643 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 60.288 -14.264 46.024
T90 42.264 -9.968 32.296
T50 11.804 -0.084 11.720
Peak 1.000 4.504 5.504
====== 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 -1.716 -0.109 0.107 - - - 3.23e-03 -1.95e-04 1.93e-04 53.020 57
CPL -1.714 -0.110 0.145 9999.060 -9999.050 -9999.060 3.24e-03 -1.46e-03 1.11e-03 53.030 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 -1.275 -0.207 0.208 - - - 1.34e-02 -1.54e-03 1.54e-03 50.410 57
CPL -1.193 N/A N/A 531.191 N/A N/A 1.46e-02 N/A N/A 50.450 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 3.05e-07 4.91e-07 5.98e-07 1.43e-06 1.80e-06 2.82e-06 erg/cm2
90%_error_low -2.85e-08 -2.75e-08 -4.98e-08 -2.41e-07 -1.14e-07 -2.84e-07 erg/cm2
90%_error_hi 2.93e-08 2.75e-08 4.99e-08 2.73e-07 1.15e-07 3.09e-07 erg/cm2
Peak flux PL 4.43e-01 5.10e-01 4.21e-01 5.85e-01 1.59e+00 1.96e+00 ph/cm2/s
90%_error_low -9.32e-02 -6.71e-02 -5.95e-02 -1.59e-01 -1.86e-01 -2.36e-01 ph/cm2/s
90%_error_hi 9.95e-02 6.60e-02 5.85e-02 1.93e-01 1.86e-01 2.41e-01 ph/cm2/s
Fluence CPL 3.11e-07 4.88e-07 5.97e-07 1.65e-06 1.82e-06 2.82e-06 erg/cm2
90%_error_low N/A N/A N/A N/A -1.38e-07 -5.30e-07 erg/cm2
90%_error_hi N/A N/A N/A N/A 9.08e-08 3.05e-07 erg/cm2
Peak flux CPL 4.44e-01 5.10e-01 4.21e-01 5.82e-01 1.59e+00 1.97e+00 ph/cm2/s
90%_error_low -1.13e-01 -6.71e-02 -5.87e-02 N/A -9.59e-02 -4.63e-01 ph/cm2/s
90%_error_hi 9.89e-02 7.34e-02 6.69e-02 N/A 1.85e-01 2.32e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 251.2600 13.8247 0.0068 32.6131 -5.2418 3.2025242 28.411 TRIG_00302888 Foreground time interval of the image: -14.264 46.024 (delta_t = 60.288 [sec]) Background time interval of the image: -365.799 -267.890 (delta_t = 97.909 [sec]) -239.000 -14.264 (delta_t = 224.736 [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 -14.264 sec. to 46.024 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.71641 ( -0.108812 0.107387 ) Norm@50keV : 3.23203E-03 ( -0.000194764 0.000193033 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.02 using 59 PHA bins. # Reduced chi-squared = 0.9301 for 57 degrees of freedom # Null hypothesis probability = 6.252694e-01 Photon flux (15-150 keV) in 60.29 sec: 0.431759 ( -0.024388 0.024442 ) ph/cm2/s Energy fluence (15-150 keV) : 1.80221e-06 ( -1.13885e-07 1.1494e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.264 sec. to 46.024 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.71447 ( -0.110015 0.144743 ) Epeak [keV] : 9999.06 ( -9999.33 -9999.34 ) Norm@50keV : 3.23553E-03 ( -0.00145894 0.00111071 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.03 using 59 PHA bins. # Reduced chi-squared = 0.9469 for 56 degrees of freedom # Null hypothesis probability = 5.881514e-01 Photon flux (15-150 keV) in 60.29 sec: 0.435196 ( -0.027857 0.020959 ) ph/cm2/s Energy fluence (15-150 keV) : 1.82421e-06 ( -1.38066e-07 9.0816e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 4.504 sec. to 5.504 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.27455 ( -0.207388 0.208018 ) Norm@50keV : 1.33552E-02 ( -0.00153988 0.00153544 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.41 using 59 PHA bins. # Reduced chi-squared = 0.8844 for 57 degrees of freedom # Null hypothesis probability = 7.188926e-01 Photon flux (15-150 keV) in 1 sec: 1.58610 ( -0.18552 0.18588 ) ph/cm2/s Energy fluence (15-150 keV) : 1.32828e-07 ( -1.73019e-08 1.74724e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.504 sec. to 5.504 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.19333 ( ) Epeak [keV] : 531.191 ( ) Norm@50keV : 1.46081E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.45 using 59 PHA bins. # Reduced chi-squared = 0.9009 for 56 degrees of freedom # Null hypothesis probability = 6.840343e-01 Photon flux (15-150 keV) in 1 sec: 1.58679 ( -0.09588 0.18525 ) ph/cm2/s Energy fluence (15-150 keV) : 1.32892e-07 ( -1.84014e-08 1.51654e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 42.264 sec. Hardness ratio (energy fluence ratio) = 1.21725057024
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 7.96106e-07 S(50-150 keV) = 1.0060845e-06
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 = 6.371740446585199E-01, IMY = 5.845579753707202E-02
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: -365.799400 -267.890000 -239.000000 -14.264000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.2862 35.3895 8.4 10.9 -0.3 0.3328 1.4 8.8 Her X-1 268.4204 -1.3706 5.7 48.1 -31.7 1.1746 2.0 5.8 SW J1753.5-0127 288.8578 10.9470 8.4 43.5 -64.5 1.7392 1.4 3.5 GRS 1915+105 299.5873 35.1938 0.7 32.7 -103.9 7.6596 17.6 0.5 Cyg X-1 308.0461 40.9443 2.2 35.8 -118.5 2.3876 5.4 2.9 Cyg X-3 274.6472 -4.5640 2.7 52.5 -38.8 4.9999 4.3 ------ UNKNOWN 333.8677 44.5533 4.1 51.1 -135.7 3.3928 2.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -14.264000 46.024000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3164 35.4782 6.7 10.8 -0.3 0.1528 1.7 10.7 Her X-1 268.2839 -1.4414 6.5 48.1 -31.5 -0.4166 -1.8 5.1 SW J1753.5-0127 288.9531 11.0025 10.5 43.5 -64.6 -0.4255 -1.1 9.7 GRS 1915+105 299.6166 35.1802 8.4 32.7 -103.9 -0.2403 -1.4 1.8 Cyg X-1 308.0040 40.8370 6.0 35.8 -118.3 -0.3192 -1.9 8.4 Cyg X-3 212.3093 61.7270 2.5 30.6 119.7 0.7222 4.6 ------ UNKNOWN 59.0384 78.4053 2.3 55.2 166.5 2.5357 5.1 ------ UNKNOWN 251.2601 13.8247 0.4 32.6 -5.2 3.2028 28.4 ------ UNKNOWN 279.3414 29.7284 2.2 23.0 -70.8 0.5804 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 141.300600 457.800630 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9726 -15.6331 0.2 30.1 -6.5 17.1614 55.7 0.6 Sco X-1 254.3279 35.4575 20.1 21.8 168.1 0.1652 0.6 9.4 Her X-1 256.0233 -37.8146 4.4 51.8 -23.5 1.9204 2.6 2.5 4U 1700-377 256.6072 -36.3920 23.2 50.5 -24.3 -0.3265 -0.5 8.5 GX 349+2 262.9454 -24.8763 16.0 40.3 -35.2 -0.3305 -0.7 8.6 GX 1+4 268.3083 -1.5801 7.3 22.9 -67.6 0.5238 1.6 8.4 SW J1753.5-0127 270.2677 -25.1333 13.5 43.1 -44.2 0.5014 0.9 3.4 GX 5-1 270.2758 -25.8727 5.4 43.8 -43.7 -1.3523 -2.1 7.9 GRS 1758-258 273.9091 -13.9391 3.8 35.7 -58.5 -1.4584 -3.1 8.1 GX 17+2 288.6307 10.9366 6.5 36.6 -108.5 1.1461 1.8 9.9 GRS 1915+105 299.5960 35.1828 1.2 48.3 -143.8 7.3144 10.0 1.2 Cyg X-1 308.0129 40.8094 13.0 56.0 -148.9 1.4878 0.9 9.7 Cyg X-3 263.0379 -33.7207 5.3 48.8 -31.7 1.4294 2.2 7.3 GX 354-0 219.5242 -12.5133 3.0 41.0 32.8 2.2837 3.9 ------ UNKNOWN 227.3301 -8.2745 2.7 32.4 29.8 1.5153 4.3 ------ UNKNOWN 249.7029 -36.4435 2.6 50.3 -17.0 2.8227 4.5 ------ UNKNOWN 244.5319 -44.2417 3.2 58.4 -13.0 6.1972 3.5 ------ UNKNOWN 267.3143 -26.6511 2.0 43.4 -39.8 2.8520 5.7 ------ UNKNOWN