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 4 17:34:24 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger727288
======================================================================
Trigger: 00727288 Segment: 000
BAT Trigger Time: 503725673.472 [s; MET]
Trigger Stop: 503725674.496 [s; MET]
UTC: 2016-12-18T03:47:36.148280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.25705184263 Dec: -4.11356983789782 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 25.38
Image Trigger?: NO
Rate S/N Ratio: 238.077718403046 [ if not an image trigger ]
Image S/N Ratio: 25.38
Analysis Position: [ source = BAT ]
RA: 245.25705184263 Dec: -4.11356983789782 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 245.250346763488 Dec: -4.11279296467415 [deg; J2000]
{ 16h 21m 00.1s , -04d 06' 46.1" }
+/- 0.612697703526967 [arcmin] (estimated 90% radius based on SNR)
+/- 0.132061689368432 [arcmin] (formal 1-sigma fit error)
SNR: 61.2424145532903
Angular difference between the analysis and refined position is 0.403967 arcmin
Partial Coding Fraction: 0.609375 [ including projection effects ]
Duration
T90: 7.19999992847443 +/- 0.545893781338456
Measured from: -0.328000009059906
to: 6.87199991941452 [s; relative to TRIGTIME]
T50: 2.97999995946884 +/- 0.0823650748911806
Measured from: 0.671999990940094
to: 3.65199995040894 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.26800000667572
to: 1.26800000667572 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.39600002765656
to: 14.5 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.966873 3.665154 3.529788 0.906156
0.043518 0.050866 0.048860 0.032758 [error]
Peak 0.330540 0.789670 0.933385 0.268048
0.014791 0.020354 0.021984 0.013607 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 15.896 -1.396 14.500
T90 7.200 -0.328 6.872
T50 2.980 0.672 3.652
Peak 1.000 0.268 1.268
====== 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: CPL)
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 -1.195 -0.033 0.033 - - - 4.41e-02 -8.31e-04 8.30e-04 89.320 57
CPL -0.639 -0.145 0.150 148.019 -18.820 30.418 7.53e-02 -9.59e-03 1.13e-02 43.010 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 -0.881 -0.046 0.046 - - - 1.58e-01 -4.57e-03 4.56e-03 101.110 57
CPL -0.060 -0.213 0.223 142.642 -18.011 28.539 3.53e-01 -6.44e-02 8.25e-02 51.830 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 6.73e-07 1.49e-06 2.60e-06 1.06e-05 7.12e-06 1.54e-05 erg/cm2
90%_error_low -2.63e-08 -3.51e-08 -5.19e-08 -4.78e-07 -1.35e-07 -4.99e-07 erg/cm2
90%_error_hi 2.67e-08 3.50e-08 5.19e-08 4.93e-07 1.35e-07 5.11e-07 erg/cm2
Peak flux PL 1.41e-03 2.15e-02 1.85e-01 2.15e+01 8.17e-01 2.11e+01 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A N/A ph/cm2/s
Fluence CPL 5.71e-07 1.52e-06 2.77e-06 5.87e-06 6.98e-06 1.07e-05 erg/cm2
90%_error_low -3.44e-08 -3.76e-08 -6.72e-08 -7.57e-07 -1.41e-07 -7.52e-07 erg/cm2
90%_error_hi 3.51e-08 3.76e-08 6.75e-08 8.99e-07 1.41e-07 8.88e-07 erg/cm2
Peak flux CPL N/A N/A N/A 3.70e-01 N/A 3.71e-01 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi 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 245.2503 -4.1128 0.0031 24.7149 -68.1876 10.3843524 61.242 TRIG_00727288 Foreground time interval of the image: -1.396 14.500 (delta_t = 15.896 [sec]) Background time interval of the image: -280.771 -259.642 (delta_t = 21.129 [sec]) -239.472 -1.396 (delta_t = 238.076 [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 -1.396 sec. to 14.500 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.19533 ( -0.03261 0.0327138 ) Norm@50keV : 4.40528E-02 ( -0.000831142 0.00083034 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 89.32 using 59 PHA bins. # Reduced chi-squared = 1.567 for 57 degrees of freedom # Null hypothesis probability = 4.005498e-03 Photon flux (15-150 keV) in 15.9 sec: 5.16755 ( -0.10541 0.10562 ) ph/cm2/s Energy fluence (15-150 keV) : 7.11651e-06 ( -1.34711e-07 1.34648e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.396 sec. to 14.500 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.638604 ( -0.145084 0.149632 ) Epeak [keV] : 148.019 ( -18.8199 30.419 ) Norm@50keV : 7.53269E-02 ( -0.00958646 0.0113054 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.01 using 59 PHA bins. # Reduced chi-squared = 0.7680 for 56 degrees of freedom # Null hypothesis probability = 8.986093e-01 Photon flux (15-150 keV) in 15.9 sec: 5.00250 ( -0.11144 0.11185 ) ph/cm2/s Energy fluence (15-150 keV) : 6.98341e-06 ( -1.40871e-07 1.40646e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.268 sec. to 1.268 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.880881 ( -0.046119 0.0464286 ) Norm@50keV : 0.157540 ( -0.00456945 0.00456319 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 101.11 using 59 PHA bins. # Reduced chi-squared = 1.7738 for 57 degrees of freedom # Null hypothesis probability = 2.893625e-04 Photon flux (15-150 keV) in 1 sec: 0.816720 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.78148e-06 ( -5.4012e-08 5.4086e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.268 sec. to 1.268 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.0604434 ( -0.212592 0.223225 ) Epeak [keV] : 142.642 ( -18.011 28.5389 ) Norm@50keV : 0.352741 ( -0.0644404 0.0824885 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.83 using 59 PHA bins. # Reduced chi-squared = 0.9256 for 56 degrees of freedom # Null hypothesis probability = 6.333080e-01 Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.7515e-06 ( -5.63427e-08 5.62152e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 7.2 sec. Hardness ratio (energy fluence ratio) = 1.8232665076
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.0917968e-06 S(50-150 keV) = 4.891682e-06
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 = 1.710193737951983E-01, IMY = 4.273105681394199E-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: -280.771410 -259.642000 -239.472000 -1.396000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9940 -15.6349 0.8 36.2 -69.8 8.8997 15.4 0.9 Sco X-1 254.6492 35.3146 208.9 16.0 125.7 0.0152 0.1 9.5 Her X-1 268.3391 -1.3528 8.2 29.6 -119.5 0.5122 1.4 6.2 SW J1753.5-0127 273.9073 -14.2240 0.0 43.1 -113.0 1.3087 1.1 12.6 GX 17+2 288.8159 10.9394 1.5 40.4 -157.3 3.1365 7.8 1.1 GRS 1915+105 299.6014 35.2118 0.7 47.4 165.9 11.4034 15.5 0.8 Cyg X-1 269.3156 37.4007 3.8 25.1 148.4 0.7923 3.0 ------ UNKNOWN 211.7303 -9.8572 3.3 46.8 -21.6 1.7428 3.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.396000 14.500000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0553 -15.4747 0.0 36.0 -69.9 -0.3220 -1.1 10.9 Sco X-1 254.4652 35.3276 12.4 15.9 125.2 0.1080 0.9 1.0 Her X-1 268.5208 -1.5617 0.0 29.9 -119.5 0.4269 2.5 11.3 SW J1753.5-0127 274.1325 -14.0799 10.9 43.1 -113.4 -0.5818 -1.1 7.8 GX 17+2 288.6476 10.8015 772.2 40.3 -157.1 0.0028 0.0 12.4 GRS 1915+105 299.6321 35.0976 22.7 47.5 166.0 0.1560 0.5 6.6 Cyg X-1 243.5096 61.0642 4.2 40.7 102.1 1.0999 2.8 ------ UNKNOWN 245.5673 41.1562 2.9 20.8 100.4 0.5021 4.0 ------ UNKNOWN 308.9889 33.9479 3.8 55.2 167.6 1.9384 3.1 ------ UNKNOWN 245.2503 -4.1128 0.2 24.7 -68.2 10.3844 61.2 ------ UNKNOWN 277.8189 -13.0948 2.4 44.6 -118.3 2.3977 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 810.628600 962.635000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 326.3011 38.2804 10.5 34.2 -80.6 -0.3588 -1.1 6.6 Cyg X-2 89.9030 85.2235 2.3 47.3 6.5 1.6316 4.9 ------ UNKNOWN 345.5952 37.2119 2.9 20.3 -94.7 0.6986 3.9 ------ UNKNOWN 349.6348 -11.6460 3.1 57.1 -154.3 3.9244 3.8 ------ UNKNOWN 292.3693 56.2324 2.6 50.6 -44.7 3.6239 4.4 ------ UNKNOWN