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: Tue Jun 21 08:57:24 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger687492
======================================================================
Trigger: 00687492 Segment: 000
BAT Trigger Time: 485832856 [s; MET]
Trigger Stop: 485832920 [s; MET]
UTC: 2016-05-25T01:33:59.682820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 103.530165020782 Dec: -0.17351014677238 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.19
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.19
Analysis Position: [ source = BAT ]
RA: 103.530165020782 Dec: -0.17351014677238 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 103.53 Dec: -0.173509 [deg; J2000]
{ 06h 54m 07.2s , 00d -10' -24.6" }
+/- 2.9214566106 [arcmin] (estimated 90% radius based on SNR)
SNR: 6.57708023186
Angular difference between the analysis and refined position is 0.009901 arcmin
Partial Coding Fraction: 0.984375 [ 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 0.000 0.000 0.000
T90 0.000 0.000 0.000
T50 0.000 0.000 0.000
Peak 0.000 0.000 0.000
====== 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 -2.622 -0.607 0.489 - - - 2.86e-04 -1.29e-04 1.42e-04 43.520 57
CPL 0.928 -2.579 6.228 25.295 -7.628 7.039 8.18e-02 -8.18e-02 4.30e+03 38.010 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 6.79e-08 6.37e-08 4.15e-08 4.18e-08 1.90e-07 2.14e-07 erg/cm2
90%_error_low -1.83e-08 -2.12e-08 -2.25e-08 -3.05e-08 -6.21e-08 -7.89e-08 erg/cm2
90%_error_hi 1.84e-08 2.08e-08 2.92e-08 6.69e-08 7.04e-08 1.11e-07 erg/cm2
Peak flux PL N/A N/A N/A N/A N/A N/A ph/cm2/s
Image
Pre-slew 15.0-50.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
103.530 -0.174 0.000 10.915 -67.355 0.467 6.577 TRIG_00687492
Image time interval: 0.000 to 64.000 [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 64.000 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.62222 ( -0.611867 0.484026 ) Norm@50keV : 2.86203E-04 ( -0.000130032 0.000141841 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.52 using 59 PHA bins. # Reduced chi-squared = 0.7635 for 57 degrees of freedom # Null hypothesis probability = 9.056671e-01 Photon flux (15-150 keV) in 64 sec: 6.07461E-02 ( -0.0157518 0.0159294 ) ph/cm2/s Energy fluence (15-150 keV) : 1.90187e-07 ( -6.21102e-08 7.03923e-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: 0.928429 ( -2.61613 6.19111 ) Epeak [keV] : 25.2953 ( -7.69657 6.9705 ) Norm@50keV : 8.17607E-02 ( -0.0967295 4302.33 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 38.01 using 59 PHA bins. # Reduced chi-squared = 0.6787 for 56 degrees of freedom # Null hypothesis probability = 9.686522e-01 Photon flux (15-150 keV) in 64 sec: 6.16879E-02 ( -0.0147758 0.0149049 ) ph/cm2/s Energy fluence (15-150 keV) : 1.66652e-07 ( -4.61784e-08 5.12749e-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 = 0.0742453777469, IMY = 0.177968965962
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] ['] 83.6407 22.0348 1.2 40.3 -62.7 2.4801 10.0 1.3 Crab 135.4750 -40.6705 8.6 39.3 130.0 0.3535 1.3 7.4 Vela X-1 114.0644 -36.2211 2.2 28.6 154.7 0.6242 5.2 ------ UNKNOWN 103.5733 -0.1943 2.1 10.9 -67.3 0.5092 5.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 324.300590 585.300600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4528 -40.5485 4.6 30.3 -108.8 0.9810 2.5 3.5 Vela X-1 170.3156 -60.5916 3.7 23.0 -175.5 0.7760 3.1 1.9 Cen X-3 186.5701 -62.7820 1.0 26.1 166.7 3.4020 12.1 2.5 GX 301-2