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 17:26:22 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger727610
======================================================================
Trigger: 00727610 Segment: 000
BAT Trigger Time: 503915627.584 [s; MET]
Trigger Stop: 503915629.632 [s; MET]
UTC: 2016-12-20T08:33:30.249440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 350.81656549025 Dec: -47.5022510820833 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7
Image Trigger?: NO
Rate S/N Ratio: 11.0453610171873 [ if not an image trigger ]
Image S/N Ratio: 7
Analysis Position: [ source = BAT ]
RA: 350.81656549025 Dec: -47.5022510820833 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 350.858842205059 Dec: -47.4828483504164 [deg; J2000]
{ 23h 23m 26.1s , -47d 28' 58.3" }
+/- 1.94025465402919 [arcmin] (estimated 90% radius based on SNR)
+/- 0.959706663365842 [arcmin] (formal 1-sigma fit error)
SNR: 11.8002611129105
Angular difference between the analysis and refined position is 2.071930 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 7.21999996900558 +/- 1.75425425941067
Measured from: -3.05199998617172
to: 4.16799998283386 [s; relative to TRIGTIME]
T50: 3.5359999537468 +/- 0.812406309563098
Measured from: -0.61599999666214
to: 2.91999995708466 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.4200000166893
to: 3.4200000166893 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.42799997329712
to: 4.46399998664856 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.149387 0.142029 0.081898 0.008882
0.017136 0.017565 0.014904 0.013305 [error]
Peak 0.034670 0.020518 0.015973 0.004675
0.006309 0.006345 0.005329 0.004735 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 7.892 -3.428 4.464
T90 7.220 -3.052 4.168
T50 3.536 -0.616 2.920
Peak 1.000 2.420 3.420
====== 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 -2.014 -0.262 0.242 - - - 2.53e-03 -4.58e-04 4.45e-04 78.990 57
CPL -1.388 -0.754 1.094 39.510 N/A N/A 5.95e-03 N/A N/A 77.580 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 -2.174 -0.596 0.489 - - - 3.47e-03 -1.38e-03 1.31e-03 73.720 57
CPL -2.181 -1.004 1.584 273.931 N/A N/A 3.39e-03 N/A N/A 73.700 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 4.14e-08 5.57e-08 5.51e-08 9.83e-08 1.84e-07 2.51e-07 erg/cm2
90%_error_low -7.23e-09 -7.63e-09 -1.32e-08 -3.92e-08 -3.06e-08 -5.66e-08 erg/cm2
90%_error_hi 7.38e-09 7.57e-09 1.37e-08 5.36e-08 3.16e-08 6.81e-08 erg/cm2
Peak flux PL 2.74e-01 1.86e-01 8.23e-02 5.05e-02 5.67e-01 5.93e-01 ph/cm2/s
90%_error_low -8.69e-02 -5.07e-02 -4.00e-02 -3.45e-02 -1.41e-01 -1.52e-01 ph/cm2/s
90%_error_hi 8.85e-02 4.85e-02 4.39e-02 6.36e-02 1.41e-01 1.54e-01 ph/cm2/s
Fluence CPL 3.97e-08 6.03e-08 5.30e-08 3.31e-08 1.73e-07 1.86e-07 erg/cm2
90%_error_low -7.92e-09 -9.99e-09 -1.59e-08 -2.61e-08 -3.22e-08 -4.35e-08 erg/cm2
90%_error_hi 7.86e-09 1.03e-08 1.51e-08 1.03e-07 3.50e-08 1.03e-07 erg/cm2
Peak flux CPL 2.74e-01 1.81e-01 8.03e-02 5.68e-02 5.61e-01 5.91e-01 ph/cm2/s
90%_error_low -9.66e-02 -1.12e-01 N/A N/A N/A -1.97e-01 ph/cm2/s
90%_error_hi 8.88e-02 6.05e-02 N/A N/A N/A 1.65e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 350.8588 -47.4828 0.0161 3.3436 -179.8910 0.3680266 11.800 TRIG_00727610 Foreground time interval of the image: -3.428 4.464 (delta_t = 7.892 [sec]) Background time interval of the image: -576.183 -559.744 (delta_t = 16.439 [sec]) -239.584 -3.428 (delta_t = 236.156 [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 -3.428 sec. to 4.464 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.01424 ( -0.261935 0.241764 ) Norm@50keV : 2.52918E-03 ( -0.000457764 0.000445284 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 78.99 using 59 PHA bins. # Reduced chi-squared = 1.386 for 57 degrees of freedom # Null hypothesis probability = 2.856032e-02 Photon flux (15-150 keV) in 7.892 sec: 0.381912 ( -0.05057 0.050572 ) ph/cm2/s Energy fluence (15-150 keV) : 1.8425e-07 ( -3.05735e-08 3.15928e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.428 sec. to 4.464 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.38797 ( -0.754358 1.09426 ) Epeak [keV] : 39.5104 ( ) Norm@50keV : 5.95041E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 77.58 using 59 PHA bins. # Reduced chi-squared = 1.385 for 56 degrees of freedom # Null hypothesis probability = 2.972149e-02 Photon flux (15-150 keV) in 7.892 sec: 0.374994 ( -0.051105 0.051316 ) ph/cm2/s Energy fluence (15-150 keV) : 1.72821e-07 ( -3.22144e-08 3.50129e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.420 sec. to 3.420 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.17406 ( -0.595524 0.488602 ) Norm@50keV : 3.47182E-03 ( -0.00138059 0.00130721 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 73.72 using 59 PHA bins. # Reduced chi-squared = 1.293 for 57 degrees of freedom # Null hypothesis probability = 6.739804e-02 Photon flux (15-150 keV) in 1 sec: 0.567101 ( -0.140719 0.14086 ) ph/cm2/s Energy fluence (15-150 keV) : 3.25349e-08 ( -1.05649e-08 1.14071e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.420 sec. to 3.420 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.18098 ( -1.00007 1.58849 ) Epeak [keV] : 273.931 ( ) Norm@50keV : 3.39289E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 73.70 using 59 PHA bins. # Reduced chi-squared = 1.316 for 56 degrees of freedom # Null hypothesis probability = 5.653754e-02 Photon flux (15-150 keV) in 1 sec: 0.560628 ( ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
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 = -5.842229921328191E-02, IMY = 1.111033683784135E-04
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: -576.183400 -559.744000 -239.584000 -3.428000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 359.3279 7.1626 2.7 52.2 29.5 5.4665 4.3 431.6 UNKNOWN 77.1081 -60.3212 2.6 51.6 157.9 4.2755 4.4 ------ UNKNOWN 18.1142 -38.5543 2.7 22.1 102.1 1.1505 4.2 ------ UNKNOWN 343.3834 5.2701 2.6 49.9 9.2 2.4794 4.4 ------ UNKNOWN 313.0101 3.8337 2.4 58.1 -27.2 7.4635 4.8 ------ UNKNOWN 305.6220 -10.3598 4.0 50.7 -44.6 3.5451 2.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -3.428000 4.464000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 1.2577 -34.0501 2.2 13.7 62.8 0.1704 5.3 ------ UNKNOWN 350.8588 -47.4829 1.0 3.3 -179.9 0.3681 11.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 56.716590 97.366000 98.416000 962.483600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 22.0403 -23.0114 3.7 34.9 67.6 4.2215 3.1 ------ UNKNOWN 352.8748 -7.6631 3.1 39.9 14.3 2.8734 3.7 ------ UNKNOWN 357.7353 -29.8542 2.7 18.4 30.4 2.1623 4.2 ------ UNKNOWN 341.4895 7.2342 2.9 55.3 -0.2 8.0950 3.9 ------ UNKNOWN 324.0279 -9.2389 2.5 44.5 -28.4 4.6382 4.7 ------ UNKNOWN 213.5274 -71.4788 4.0 57.2 -154.1 12.5427 2.9 ------ UNKNOWN 310.4142 -9.9585 4.8 50.6 -44.6 8.1130 2.4 ------ UNKNOWN