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 11:19:01 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger251863
======================================================================
Trigger: 00251863 Segment: 000
BAT Trigger Time: 188107507.456 [s; MET]
Trigger Stop: 188107511.552 [s; MET]
UTC: 2006-12-18T04:05:05.815160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 149.222968728283 Dec: -35.146298988644 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.71
Image Trigger?: NO
Rate S/N Ratio: 9 [ if not an image trigger ]
Image S/N Ratio: 6.71
Analysis Position: [ source = BAT ]
RA: 149.222968728283 Dec: -35.146298988644 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 149.246845484682 Dec: -35.2219068502434 [deg; J2000]
{ 09h 56m 59.2s , -35d 13' 18.9" }
+/- 3.9382942658473 [arcmin] (estimated 90% radius based on SNR)
+/- 2.72801583102233 [arcmin] (formal 1-sigma fit error)
SNR: 4.29218217826145
Angular difference between the analysis and refined position is 4.685139 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 -2.607 -0.656 0.514 - - - 1.02e-03 -4.82e-04 5.06e-04 73.730 57
CPL 0.865 -2.848 7.891 24.595 N/A N/A 2.75e-01 N/A N/A 70.610 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 1.53e-08 1.44e-08 9.46e-09 9.63e-09 4.31e-08 4.88e-08 erg/cm2
90%_error_low -4.53e-09 -5.00e-09 -5.34e-09 -7.25e-09 -1.46e-08 -1.88e-08 erg/cm2
90%_error_hi 4.56e-09 4.80e-09 6.75e-09 1.61e-08 1.62e-08 2.55e-08 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 149.2468 -35.2219 0.0445 17.1608 5.5683 0.0817638 4.292 TRIG_00251863 Foreground time interval of the image: 0.000 4.096 (delta_t = 4.096 [sec]) Background time interval of the image: -239.456 -19.456 (delta_t = 220.000 [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 0.000 sec. to 4.096 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.60735 ( -0.655933 0.51394 ) Norm@50keV : 1.01917E-03 ( -0.000481522 0.000506339 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 73.73 using 59 PHA bins. # Reduced chi-squared = 1.294 for 57 degrees of freedom # Null hypothesis probability = 6.723593e-02 Photon flux (15-150 keV) in 4.096 sec: 0.214168 ( -0.058873 0.059091 ) ph/cm2/s Energy fluence (15-150 keV) : 4.30756e-08 ( -1.46441e-08 1.61869e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.865357 ( -2.89185 7.84709 ) Epeak [keV] : 24.5945 ( ) Norm@50keV : 0.274919 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 70.60 using 59 PHA bins. # Reduced chi-squared = 1.261 for 56 degrees of freedom # Null hypothesis probability = 9.062536e-02 Photon flux (15-150 keV) in 4.096 sec: 0.212015 ( -0.055956 0.056357 ) ph/cm2/s Energy fluence (15-150 keV) : 3.60413e-08 ( -1.0443e-08 1.31253e-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 = 3.073445483436223E-01, IMY = -2.996374789010648E-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: -239.456000 -19.456000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5333 -40.5594 0.1 28.7 14.9 15.8857 77.9 0.4 Vela X-1 170.3762 -60.6573 3.7 40.1 -34.4 1.0217 3.1 2.7 Cen X-3 186.8986 -62.8459 4.5 45.4 -43.4 1.4660 2.6 8.0 GX 301-2 139.2688 16.3255 2.5 42.8 122.5 3.5098 4.6 ------ UNKNOWN 190.6828 29.3098 3.0 58.3 -175.7 5.4174 3.8 ------ UNKNOWN 186.4443 17.5001 2.7 46.3 -171.5 1.4474 4.3 ------ UNKNOWN 118.3406 -69.0469 2.6 54.3 -9.7 2.6911 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.000000 4.096000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5372 -40.5749 1.2 28.7 14.9 0.2034 9.6 1.3 Vela X-1 169.9196 -60.7206 0.0 40.2 -34.0 -0.0668 -2.1 13.0 Cen X-3 186.8583 -62.6577 16.9 45.3 -43.6 -0.0329 -0.7 8.7 GX 301-2 135.2467 11.9269 2.2 41.3 114.1 0.4343 5.1 ------ UNKNOWN 120.9480 -54.0761 2.3 44.4 5.4 0.1689 4.9 ------ UNKNOWN 189.7887 23.0725 2.2 52.7 -172.2 0.2461 5.3 ------ UNKNOWN 166.8876 -45.1399 2.5 24.6 -37.9 0.0966 4.6 ------ UNKNOWN 193.0907 -49.1084 2.0 38.1 -61.7 0.2302 5.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 90.044600 542.244600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5300 -40.5516 0.1 12.1 25.0 24.7312 83.0 0.2 Vela X-1 170.3380 -60.6027 3.4 28.8 -55.8 1.5734 3.4 1.4 Cen X-3 186.6714 -62.7618 69.9 36.0 -62.6 0.1094 0.2 0.6 GX 301-2 177.8005 14.8309 3.2 56.9 179.2 6.5762 3.6 ------ UNKNOWN 53.3959 -81.1324 3.4 56.2 -23.7 5.0524 3.4 ------ UNKNOWN