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 05:44:04 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger295779
======================================================================
Trigger: 00295779 Segment: 000
BAT Trigger Time: 215632428.928 [s; MET]
Trigger Stop: 215632430.976 [s; MET]
UTC: 2007-11-01T17:53:46.595880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 48.1935449819936 Dec: 62.4734168223862 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.51
Image Trigger?: NO
Rate S/N Ratio: 9.2736184954957 [ if not an image trigger ]
Image S/N Ratio: 6.51
Analysis Position: [ source = BAT ]
RA: 48.1935449819936 Dec: 62.4734168223862 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 48.1938288093563 Dec: 62.5433978046221 [deg; J2000]
{ 03h 12m 46.5s , +62d 32' 36.2" }
+/- 2.35401134868118 [arcmin] (estimated 90% radius based on SNR)
+/- 1.5266903466389 [arcmin] (formal 1-sigma fit error)
SNR: 8.9528911709225
Angular difference between the analysis and refined position is 4.198866 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 4.824000030756 +/- 1.97251515354481
Measured from: -1.31600001454353
to: 3.50800001621246 [s; relative to TRIGTIME]
T50: 1.74799999594688 +/- 1.34750140747039
Measured from: 0.104000002145767
to: 1.85199999809265 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.208000004291534
to: 0.791999995708466 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.55200001597404
to: 3.62399998307228 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.050266 0.058764 0.022272 0.024852
0.011134 0.011638 0.010380 0.009800 [error]
Peak 0.016573 0.028180 0.012534 0.014056
0.005023 0.005290 0.004628 0.004199 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 5.176 -1.552 3.624
T90 4.824 -1.316 3.508
T50 1.748 0.104 1.852
Peak 1.000 -0.208 0.792
====== 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 -2.002 -0.471 0.409 - - - 1.47e-03 -4.71e-04 4.54e-04 37.160 57
CPL -0.823 -1.310 2.961 37.661 -37.661 -37.661 7.83e-03 -7.83e-03 6.04e-01 36.130 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 -1.524 -0.413 0.401 - - - 3.72e-03 -1.00e-03 9.80e-04 56.970 57
CPL 0.476 -2.124 3.650 51.299 -13.900 -51.299 5.30e-02 -5.30e-02 6.20e+00 54.620 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 1.56e-08 2.11e-08 2.11e-08 3.81e-08 7.02e-08 9.59e-08 erg/cm2
90%_error_low -4.46e-09 -5.06e-09 -8.63e-09 -2.34e-08 -2.02e-08 -3.59e-08 erg/cm2
90%_error_hi 4.58e-09 4.96e-09 9.41e-09 4.08e-08 2.17e-08 5.02e-08 erg/cm2
Peak flux PL 1.57e-01 1.55e-01 1.08e-01 1.19e-01 4.67e-01 5.39e-01 ph/cm2/s
90%_error_low -5.62e-02 -3.92e-02 -3.58e-02 -6.20e-02 -1.15e-01 -1.38e-01 ph/cm2/s
90%_error_hi 6.05e-02 3.90e-02 3.63e-02 9.39e-02 1.15e-01 1.42e-01 ph/cm2/s
Fluence CPL 1.48e-08 2.43e-08 1.82e-08 5.37e-09 6.14e-08 6.26e-08 erg/cm2
90%_error_low -5.05e-09 -7.15e-09 -1.15e-08 N/A -1.88e-08 -1.99e-08 erg/cm2
90%_error_hi 4.92e-09 7.57e-09 1.13e-08 N/A 2.58e-08 6.94e-08 erg/cm2
Peak flux CPL 1.30e-01 1.94e-01 1.01e-01 1.30e-02 4.38e-01 4.39e-01 ph/cm2/s
90%_error_low -6.78e-02 -5.83e-02 N/A -1.30e-02 -1.16e-01 -1.18e-01 ph/cm2/s
90%_error_hi 6.91e-02 6.19e-02 N/A 1.18e-01 1.19e-01 1.50e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 48.1938 62.5434 0.0214 12.8028 -126.0849 0.1860988 8.953 TRIG_00295779 Foreground time interval of the image: -1.552 3.624 (delta_t = 5.176 [sec]) Background time interval of the image: -420.527 -325.830 (delta_t = 94.698 [sec]) -239.928 -1.552 (delta_t = 238.376 [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 -1.552 sec. to 3.624 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.0018 ( -0.471111 0.40935 ) Norm@50keV : 1.47000E-03 ( -0.000471453 0.000454014 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 37.16 using 59 PHA bins. # Reduced chi-squared = 0.6519 for 57 degrees of freedom # Null hypothesis probability = 9.806735e-01 Photon flux (15-150 keV) in 5.176 sec: 0.220700 ( -0.049836 0.049878 ) ph/cm2/s Energy fluence (15-150 keV) : 7.01866e-08 ( -2.0193e-08 2.17026e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.552 sec. to 3.624 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.82335 ( -1.31352 2.95717 ) Epeak [keV] : 37.6607 ( -37.6582 -37.6582 ) Norm@50keV : 7.83213E-03 ( -0.00788713 0.604097 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 36.13 using 59 PHA bins. # Reduced chi-squared = 0.6453 for 56 degrees of freedom # Null hypothesis probability = 9.819378e-01 Photon flux (15-150 keV) in 5.176 sec: 0.213340 ( -0.049691 0.050853 ) ph/cm2/s Energy fluence (15-150 keV) : 6.14091e-08 ( -1.87831e-08 2.57644e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.208 sec. to 0.792 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.52382 ( -0.413482 0.400995 ) Norm@50keV : 3.71871E-03 ( -0.00100002 0.00097964 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.97 using 59 PHA bins. # Reduced chi-squared = 0.9995 for 57 degrees of freedom # Null hypothesis probability = 4.760547e-01 Photon flux (15-150 keV) in 1 sec: 0.467286 ( -0.115436 0.115478 ) ph/cm2/s Energy fluence (15-150 keV) : 3.51536e-08 ( -1.00665e-08 1.04995e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.208 sec. to 0.792 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.475826 ( -2.14389 3.62978 ) Epeak [keV] : 51.2991 ( -13.6941 -51.0936 ) Norm@50keV : 5.29841E-02 ( -0.055424 6.19363 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 54.62 using 59 PHA bins. # Reduced chi-squared = 0.9753 for 56 degrees of freedom # Null hypothesis probability = 5.272712e-01 Photon flux (15-150 keV) in 1 sec: 0.437714 ( -0.116352 0.119316 ) ph/cm2/s Energy fluence (15-150 keV) : 2.82872e-08 ( -8.99641e-09 1.25786e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 4.824 sec. Hardness ratio (energy fluence ratio) = 0.99882678525
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.673526e-08 S(50-150 keV) = 3.345197e-08
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 = -1.338434368322440E-01, IMY = 1.836470600866191E-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: -420.527400 -325.829600 -239.928000 -1.552000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6343 22.0086 0.3 35.6 24.3 13.9384 39.8 0.4 Crab 336.8680 35.9239 3.7 56.9 179.1 4.7005 3.1 ------ UNKNOWN 109.7307 25.4345 2.6 47.6 -7.7 2.2332 4.4 ------ UNKNOWN 105.4332 40.3485 2.2 35.2 -21.5 1.5945 5.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.552000 3.624000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6313 22.1639 4.4 35.5 24.1 0.0878 2.6 9.0 Crab 358.4503 23.3747 2.2 52.0 152.0 0.6133 5.3 ------ UNKNOWN 48.1929 62.5435 1.3 12.8 -126.1 0.1857 8.9 ------ UNKNOWN 305.4566 67.0668 2.2 51.5 -136.6 0.5641 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 62.372610 310.972600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6296 22.0276 0.7 47.0 27.9 10.6621 17.7 0.8 Crab 308.1723 40.9066 15.4 58.7 -165.5 -1.0984 -0.7 3.9 Cyg X-3 326.3520 38.3596 59.8 53.0 178.8 0.1246 0.2 8.8 Cyg X-2