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 11:43:22 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger259714
======================================================================
Trigger: 00259714 Segment: 000
BAT Trigger Time: 192618636.032 [s; MET]
Trigger Stop: 192618637.44 [s; MET]
UTC: 2007-02-08T09:10:34.281260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 197.920440046571 Dec: 61.9586566987151 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.29
Image Trigger?: NO
Rate S/N Ratio: 10.0498756211209 [ if not an image trigger ]
Image S/N Ratio: 7.29
Analysis Position: [ source = BAT ]
RA: 197.920440046571 Dec: 61.9586566987151 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 197.92 Dec: 61.9587 [deg; J2000]
{ 13h 11m 40.8s , +61d 57' 31.3" }
+/- 3.12315411088 [arcmin] (estimated 90% radius based on SNR)
SNR: 5.97878830649
Angular difference between the analysis and refined position is 0.012681 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 64 +/- 22.6274169979695
Measured from: -15.0320000052452
to: 48.9679999947548 [s; relative to TRIGTIME]
T50: 48 +/- 16
Measured from: -15.0320000052452
to: 32.9679999947548 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 40.4679999947548
to: 41.4679999947548 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.0320000052452
to: 48.9679999947548 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.298903 0.328131 0.256813 0.033002
0.056884 0.059151 0.051824 0.045397 [error]
Peak 0.015963 0.011216 0.017990 0.003709
0.006936 0.007123 0.006438 0.005589 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 64.000 -15.032 48.968
T90 64.000 -15.032 48.968
T50 48.000 -15.032 32.968
Peak 1.000 40.468 41.468
====== 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 -1.968 -0.385 0.340 - - - 8.79e-04 -2.13e-04 2.02e-04 38.440 57
CPL -1.651 -0.529 1.403 51.290 -49.977 -51.290 1.30e-03 -1.30e-03 5.90e-03 38.220 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 -1.094 -0.823 1.017 - - - 3.26e-03 -1.57e-03 1.44e-03 50.280 57
CPL -1.089 -0.827 1.025 9999.340 -9999.340 -9999.340 3.28e-03 -1.57e-03 9.05e-02 50.280 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 1.12e-07 1.55e-07 1.58e-07 2.94e-07 5.18e-07 7.19e-07 erg/cm2
90%_error_low -2.90e-08 -2.89e-08 -5.07e-08 -1.53e-07 -1.16e-07 -2.17e-07 erg/cm2
90%_error_hi 3.04e-08 2.88e-08 5.16e-08 2.30e-07 1.19e-07 2.76e-07 erg/cm2
Peak flux PL 9.12e-02 1.17e-01 1.10e-01 1.81e-01 3.78e-01 4.98e-01 ph/cm2/s
90%_error_low -7.14e-02 -1.17e-01 -5.25e-02 -1.81e-01 -1.76e-01 -2.15e-01 ph/cm2/s
90%_error_hi 1.01e-01 6.56e-02 5.00e-02 2.96e-01 1.79e-01 2.37e-01 ph/cm2/s
Fluence CPL 1.07e-07 1.61e-07 1.60e-07 1.81e-07 5.08e-07 6.09e-07 erg/cm2
90%_error_low -3.40e-08 -6.38e-08 -5.32e-08 -1.48e-07 -1.18e-07 -2.04e-07 erg/cm2
90%_error_hi 3.16e-08 3.73e-08 5.44e-08 1.13e-07 1.29e-07 2.85e-07 erg/cm2
Peak flux CPL 1.01e-01 1.18e-01 1.08e-01 2.00e-01 3.82e-01 5.00e-01 ph/cm2/s
90%_error_low N/A -1.18e-01 -5.17e-02 N/A -3.82e-01 -2.76e-01 ph/cm2/s
90%_error_hi N/A 6.86e-02 6.05e-02 N/A 1.83e-01 2.32e-01 ph/cm2/s
======================================================================
Image
Pre-slew 25.0-100.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 197.920 61.959 0.000 39.456 -27.329 0.078 5.979 TRIG_00259714 Image time interval: 0.000 to 1.408 [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 -15.032 sec. to 48.968 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.96834 ( -0.384601 0.340247 ) Norm@50keV : 8.79065E-04 ( -0.000212885 0.000201839 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 38.44 using 59 PHA bins. # Reduced chi-squared = 0.6744 for 57 degrees of freedom # Null hypothesis probability = 9.718691e-01 Photon flux (15-150 keV) in 64 sec: 0.129986 ( -0.024153 0.024162 ) ph/cm2/s Energy fluence (15-150 keV) : 5.18167e-07 ( -1.15506e-07 1.18834e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.032 sec. to 48.968 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.65099 ( -0.530835 1.40069 ) Epeak [keV] : 51.2900 ( -49.9107 -51.2237 ) Norm@50keV : 1.30418E-03 ( -0.00130738 0.00590022 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 38.22 using 59 PHA bins. # Reduced chi-squared = 0.6826 for 56 degrees of freedom # Null hypothesis probability = 9.667414e-01 Photon flux (15-150 keV) in 64 sec: 0.128566 ( -0.024686 0.024664 ) ph/cm2/s Energy fluence (15-150 keV) : 5.08335e-07 ( -1.18366e-07 1.29253e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 40.468 sec. to 41.468 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.09404 ( -0.822778 1.01655 ) Norm@50keV : 3.26414E-03 ( -0.00156786 0.00144146 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.28 using 59 PHA bins. # Reduced chi-squared = 0.8821 for 57 degrees of freedom # Null hypothesis probability = 7.233181e-01 Photon flux (15-150 keV) in 1 sec: 0.378401 ( -0.175725 0.178959 ) ph/cm2/s Energy fluence (15-150 keV) : 3.41964e-08 ( -1.54947e-08 1.56886e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 40.468 sec. to 41.468 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.08871 ( -0.827023 1.02531 ) Epeak [keV] : 9999.34 ( -9999.36 -9999.36 ) Norm@50keV : 3.28145E-03 ( -0.00156795 0.0904732 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.28 using 59 PHA bins. # Reduced chi-squared = 0.8979 for 56 degrees of freedom # Null hypothesis probability = 6.901041e-01 Photon flux (15-150 keV) in 1 sec: 0.381879 ( -0.381879 0.182649 ) ph/cm2/s Energy fluence (15-150 keV) : 3.43416e-08 ( -1.64442e-08 1.26035e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 64.0 sec. Hardness ratio (energy fluence ratio) = 1.022233585
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.662228e-07 S(50-150 keV) = 2.5193822e-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 = 0.731177215682, IMY = 0.377855168207
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: -239.032000 -15.032000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6300 22.0117 0.7 50.3 -161.7 7.5872 17.2 0.2 Crab 114.9921 5.7993 2.0 42.1 151.2 2.0492 5.7 ------ UNKNOWN 103.3975 14.5042 2.4 41.4 172.8 1.3911 4.8 ------ UNKNOWN 80.3697 12.2662 2.5 58.9 -168.5 4.6613 4.7 ------ UNKNOWN 187.1259 63.7221 2.4 34.9 -31.5 1.0983 4.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -15.032000 27.868600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6798 22.1449 15.2 50.2 -161.6 -0.1170 -0.8 8.2 Crab 126.7399 -2.5471 2.2 45.9 131.2 1.4527 5.2 ------ UNKNOWN 197.8975 61.9381 2.2 39.4 -27.3 0.5095 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 98.868600 603.018000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4504 35.4696 10.7 43.7 -56.1 3.6213 1.1 7.6 Her X-1 160.6103 32.6442 2.5 37.7 80.2 11.8307 4.6 ------ UNKNOWN 180.0529 63.5187 2.9 8.3 132.6 3.5089 4.0 ------ UNKNOWN 164.9911 69.4096 2.8 15.2 157.0 3.5680 4.1 ------ UNKNOWN 228.0072 30.5205 2.6 37.0 -22.2 5.3369 4.5 ------ UNKNOWN