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: Sun Jan 19 13:01:53 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger374875
======================================================================
Trigger: 00374875 Segment: 000
BAT Trigger Time: 279017368 [s; MET]
Trigger Stop: 279017432 [s; MET]
UTC: 2009-11-04T08:49:22.769700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 208.742361503349 Dec: 47.3985736611166 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.72
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.72
Analysis Position: [ source = BAT ]
RA: 208.742361503349 Dec: 47.3985736611166 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 208.72632023517 Dec: 47.3909759427838 [deg; J2000]
{ 13h 54m 54.3s , +47d 23' 27.5" }
+/- 2.65013664772682 [arcmin] (estimated 90% radius based on SNR)
+/- 1.10810460127059 [arcmin] (formal 1-sigma fit error)
SNR: 7.55874032868928
Angular difference between the analysis and refined position is 0.795184 arcmin
Partial Coding Fraction: 0.8203125 [ including projection effects ]
Duration
T90: 107.135999917984 +/- 19.6440599779123
Measured from: 7.98000001907349
to: 115.115999937057 [s; relative to TRIGTIME]
T50: 58.351999938488 +/- 15.1044953399545
Measured from: 27.3439999818802
to: 85.6959999203682 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 83.3360000252724
to: 84.3360000252724 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.48000001907349
to: 120.519999980927 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.438505 0.501269 0.314328 0.149297
0.057153 0.059636 0.054273 0.050684 [error]
Peak 0.007873 0.013757 0.022607 0.005318
0.005110 0.005489 0.004703 0.004529 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 122.000 -1.480 120.520
T90 107.136 7.980 115.116
T50 58.352 27.344 85.696
Peak 1.000 83.336 84.336
====== 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 -1.734 -0.243 0.231 - - - 6.76e-04 -1.04e-04 1.01e-04 54.280 57
CPL -1.119 -0.508 1.249 62.272 -37.323 -62.272 1.50e-03 -8.80e-04 5.99e-03 53.190 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 -0.995 -0.537 0.597 - - - 3.13e-03 -1.04e-03 1.02e-03 57.990 57
CPL 0.949 -2.449 6.797 86.954 N/A N/A 2.12e-02 N/A N/A 56.590 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 1.31e-07 2.09e-07 2.51e-07 5.90e-07 7.62e-07 1.18e-06 erg/cm2
90%_error_low -2.45e-08 -2.68e-08 -5.20e-08 -2.15e-07 -1.20e-07 -2.73e-07 erg/cm2
90%_error_hi 2.53e-08 2.68e-08 5.28e-08 2.85e-07 1.24e-07 3.31e-07 erg/cm2
Peak flux PL 7.95e-02 1.08e-01 1.09e-01 1.97e-01 3.60e-01 4.94e-01 ph/cm2/s
90%_error_low -4.56e-02 -4.47e-02 -3.75e-02 -1.12e-01 -1.19e-01 -8.21e-02 ph/cm2/s
90%_error_hi 5.81e-02 4.37e-02 3.69e-02 1.86e-01 1.21e-01 1.82e-01 ph/cm2/s
Fluence CPL 1.23e-07 2.25e-07 2.48e-07 2.13e-07 7.11e-07 8.10e-07 erg/cm2
90%_error_low -2.87e-08 -3.65e-08 -6.04e-08 -1.66e-07 -1.36e-07 -2.21e-07 erg/cm2
90%_error_hi 2.84e-08 3.87e-08 5.75e-08 4.46e-07 1.47e-07 4.86e-07 erg/cm2
Peak flux CPL 4.45e-02 1.13e-01 1.29e-01 5.26e-02 3.26e-01 3.39e-01 ph/cm2/s
90%_error_low -4.45e-02 -6.38e-02 -4.75e-02 -5.26e-02 -1.28e-01 -1.41e-01 ph/cm2/s
90%_error_hi 7.48e-02 5.54e-02 5.17e-02 1.99e-01 1.32e-01 2.44e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 208.7263 47.3910 0.0254 21.6965 -131.6940 0.9175478 7.559 TRIG_00374875 Foreground time interval of the image: -1.480 73.501 (delta_t = 74.981 [sec]) Background time interval of the image: -138.099 -1.480 (delta_t = 136.619 [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 -1.480 sec. to 120.520 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.73428 ( -0.243094 0.231102 ) Norm@50keV : 6.75801E-04 ( -0.000104063 0.000101461 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.28 using 59 PHA bins. # Reduced chi-squared = 0.9522 for 57 degrees of freedom # Null hypothesis probability = 5.779072e-01 Photon flux (15-150 keV) in 122 sec: 9.08601E-02 ( -0.0116566 0.0116569 ) ph/cm2/s Energy fluence (15-150 keV) : 7.61623e-07 ( -1.20325e-07 1.23696e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.480 sec. to 120.520 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.11881 ( -0.508498 1.24911 ) Epeak [keV] : 62.2715 ( -37.3173 -62.2655 ) Norm@50keV : 1.49831E-03 ( -0.00088003 0.00598882 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.19 using 59 PHA bins. # Reduced chi-squared = 0.9499 for 56 degrees of freedom # Null hypothesis probability = 5.817401e-01 Photon flux (15-150 keV) in 122 sec: 8.85516E-02 ( -0.0122323 0.0122194 ) ph/cm2/s Energy fluence (15-150 keV) : 7.11492e-07 ( -1.35721e-07 1.46671e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 83.336 sec. to 84.336 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.994593 ( -0.536724 0.597466 ) Norm@50keV : 3.12938E-03 ( -0.00103596 0.00102075 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.99 using 59 PHA bins. # Reduced chi-squared = 1.017 for 57 degrees of freedom # Null hypothesis probability = 4.386239e-01 Photon flux (15-150 keV) in 1 sec: 0.360192 ( -0.119363 0.120947 ) ph/cm2/s Energy fluence (15-150 keV) : 3.3907e-08 ( -1.15043e-08 1.17335e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 83.336 sec. to 84.336 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.949483 ( -2.48835 6.75768 ) Epeak [keV] : 86.9537 ( ) Norm@50keV : 2.11912E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.58 using 59 PHA bins. # Reduced chi-squared = 1.010 for 56 degrees of freedom # Null hypothesis probability = 4.532761e-01 Photon flux (15-150 keV) in 1 sec: 0.326362 ( -0.128432 0.131528 ) ph/cm2/s Energy fluence (15-150 keV) : 3.04074e-08 ( -1.19288e-08 1.29118e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 107.136 sec. Hardness ratio (energy fluence ratio) = 1.20226408813
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.402873e-07 S(50-150 keV) = 4.213274e-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 = -2.646494126456019E-01, IMY = 2.970982505726540E-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: -138.099410 -1.480000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 145.0597 2.3387 2.6 55.1 0.1 2.2305 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.480000 73.500600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 167.7263 31.4825 2.3 20.4 -18.5 0.4979 5.0 ------ UNKNOWN 208.7263 47.3910 1.5 21.7 -131.7 0.9175 7.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 120.300590 483.067200 661.000000 723.088800 841.000000 903.084100 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.6083 35.4354 6.4 35.8 -165.6 0.6653 1.8 9.2 Her X-1 143.0267 39.6708 3.3 46.8 27.8 2.9501 3.6 ------ UNKNOWN 156.3635 45.1356 2.6 35.6 28.2 1.8455 4.5 ------ UNKNOWN 259.4216 11.8119 3.1 55.2 -145.3 8.1710 3.7 ------ UNKNOWN