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 14:52:21 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger221627
======================================================================
Trigger: 00221627 Segment: 000
BAT Trigger Time: 175818272 [s; MET]
Trigger Stop: 175818336 [s; MET]
UTC: 2006-07-28T22:24:30.654180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 16.6935998159746 Dec: -41.3863114891152 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.18
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.18
Analysis Position: [ source = BAT ]
RA: 16.6935998159746 Dec: -41.3863114891152 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 16.6391594344528 Dec: -41.3882200209987 [deg; J2000]
{ 01h 06m 33.4s , -41d 23' 17.6" }
+/- 3.23997174452612 [arcmin] (estimated 90% radius based on SNR)
+/- 1.98434761561568 [arcmin] (formal 1-sigma fit error)
SNR: 5.67249048415171
Angular difference between the analysis and refined position is 2.453334 arcmin
Partial Coding Fraction: 1.03125 [ 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: 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 -1.438 -0.437 0.435 - - - 3.63e-04 -1.03e-04 1.02e-04 60.330 57
CPL -0.172 -1.462 2.702 64.551 -25.631 -64.551 1.82e-03 -1.82e-03 9.53e-02 58.380 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 2.79e-08 5.34e-08 7.88e-08 2.50e-07 2.23e-07 4.10e-07 erg/cm2
90%_error_low -1.11e-08 -1.49e-08 -2.77e-08 -1.40e-07 -6.80e-08 -1.72e-07 erg/cm2
90%_error_hi 1.22e-08 1.48e-08 2.82e-08 2.31e-07 7.09e-08 2.48e-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 16.6392 -41.3882 0.0341 7.1288 158.1110 0.3681373 5.672 TRIG_00221627 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: -1.43792 ( -0.438168 0.433959 ) Norm@50keV : 3.62584E-04 ( -0.000102864 0.000101693 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 60.33 using 59 PHA bins. # Reduced chi-squared = 1.058 for 57 degrees of freedom # Null hypothesis probability = 3.563585e-01 Photon flux (15-150 keV) in 64 sec: 4.45499E-02 ( -0.0121254 0.0121434 ) ph/cm2/s Energy fluence (15-150 keV) : 2.22648e-07 ( -6.80019e-08 7.09005e-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: -0.171823 ( -1.4431 2.72147 ) Epeak [keV] : 64.5510 ( -25.7338 -64.6542 ) Norm@50keV : 1.81682E-03 ( -0.0017894 0.0953454 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.38 using 59 PHA bins. # Reduced chi-squared = 1.042 for 56 degrees of freedom # Null hypothesis probability = 3.880046e-01 Photon flux (15-150 keV) in 64 sec: 4.29390E-02 ( -0.0063269 0.0121557 ) ph/cm2/s Energy fluence (15-150 keV) : 1.96404e-07 ( -7.14957e-08 7.74445e-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 = -1.160505753850820E-01, IMY = -4.662617973738296E-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:
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] ['] 284.0174 -76.9116 2.3 44.2 7.7 0.6405 4.9 ------ UNKNOWN 349.5082 -71.3565 2.6 26.6 9.0 0.3315 4.5 ------ UNKNOWN 16.6425 -41.3842 2.2 7.1 158.1 0.3450 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 107.500590 901.400580 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 334.3824 -59.4648 2.4 31.6 41.7 2.0764 4.8 ------ UNKNOWN