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 11:52:09 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger257741
======================================================================
Trigger: 00257741 Segment: 000
BAT Trigger Time: 191471608 [s; MET]
Trigger Stop: 191471672 [s; MET]
UTC: 2007-01-26T02:33:26.277220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 33.4603956656862 Dec: -73.5233322332982 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.04
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.04
Analysis Position: [ source = BAT ]
RA: 33.4603956656862 Dec: -73.5233322332982 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 33.4935643891249 Dec: -73.5482277700538 [deg; J2000]
{ 02h 13m 58.5s , -73d 32' 53.6" }
+/- 3.9614940219348 [arcmin] (estimated 90% radius based on SNR)
+/- 2.39154788838823 [arcmin] (formal 1-sigma fit error)
SNR: 4.25631819181088
Angular difference between the analysis and refined position is 1.596675 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: N/A +/- N/A
Measured from: N/A
to: N/A [s; relative to TRIGTIME]
T50: N/A +/- N/A
Measured from: N/A
to: N/A [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 N/A N/A N/A
T90 N/A N/A N/A
T50 N/A N/A N/A
Peak N/A N/A N/A
====== 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 -1.881 -0.521 0.484 - - - 2.74e-04 -1.06e-04 1.09e-04 57.590 57
CPL 2.390 -1.003 -2.390 36.372 -7.525 2.966 1.36e-01 -1.36e-01 2.31e+04 48.220 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 N/A N/A N/A - - - N/A N/A N/A N/A N/A
CPL N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
=== 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 3.19e-08 4.68e-08 5.12e-08 1.05e-07 1.62e-07 2.37e-07 erg/cm2
90%_error_low -1.24e-08 -1.54e-08 -2.42e-08 -7.02e-08 -6.08e-08 -1.11e-07 erg/cm2
90%_error_hi 1.30e-08 1.54e-08 2.71e-08 1.32e-07 6.60e-08 1.56e-07 erg/cm2
Peak flux PL N/A N/A N/A N/A N/A 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 33.4936 -73.5482 0.0450 6.0638 91.9942 0.3034612 4.256 TRIG_00257741 Foreground time interval of the image: 0.000 64.000 (delta_t = 64.000 [sec]) Background time interval of the image:
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 0.000 sec. to 64.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.88105 ( -0.537371 0.467696 ) Norm@50keV : 2.74146E-04 ( -0.000106895 0.0001081 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.59 using 59 PHA bins. # Reduced chi-squared = 1.010 for 57 degrees of freedom # Null hypothesis probability = 4.530562e-01 Photon flux (15-150 keV) in 64 sec: 3.90498E-02 ( -0.0126629 0.0126784 ) ph/cm2/s Energy fluence (15-150 keV) : 1.61998e-07 ( -6.07842e-08 6.60358e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 6.97896 ( -5.63269 -7.02 ) Epeak [keV] : 33.4753 ( -4.59404 5.89712 ) Norm@50keV : 161.604 ( -189.24 22947.6 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.27 using 59 PHA bins. # Reduced chi-squared = 0.8263 for 56 degrees of freedom # Null hypothesis probability = 8.197536e-01 Photon flux (15-150 keV) in 64 sec: 3.72855E-02 ( -0.0108827 0.0114898 ) ph/cm2/s Energy fluence (15-150 keV) : 1.17244e-07 ( -3.55157e-08 4.22122e-08 ) ergs/cm2
1-s peak spectrum fit
1-s peak spectrum unavailable, likely because there are no event data in the 1-s peak range.
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 = -3.696553962752156E-03, IMY = -1.061658211320078E-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:
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.000000 64.000000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.4266 -60.6116 3.5 45.4 153.4 0.6279 3.3 3.3 Cen X-3 186.6532 -62.7872 3.3 44.0 164.6 0.5122 3.5 1.0 GX 301-2 109.3823 -60.3717 2.2 35.5 110.6 0.8255 5.2 ------ UNKNOWN 29.6503 -24.0322 2.4 50.0 9.1 0.9718 4.7 ------ UNKNOWN 192.4051 -68.5243 2.9 38.3 168.4 0.4529 4.0 ------ UNKNOWN 303.8718 -45.1568 2.6 41.1 -97.9 1.5760 4.4 ------ UNKNOWN 299.4074 -46.0624 2.3 41.5 -102.8 1.7508 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 101.700600 433.400600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.7415 -60.6154 15.6 42.9 151.8 0.3443 0.7 12.5 Cen X-3 186.4108 -62.7337 4.8 42.6 163.2 1.0049 2.4 7.1 GX 301-2 60.5168 -31.0626 2.2 44.7 34.8 2.5561 5.2 ------ UNKNOWN 46.5644 -66.1244 2.4 8.6 38.9 0.8651 4.9 ------ UNKNOWN 325.6008 -62.0932 3.0 26.2 -99.5 1.1032 3.9 ------ UNKNOWN