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: Fri Oct 19 18:04:28 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger865036
======================================================================
Trigger: 00865036 Segment: 000
BAT Trigger Time: 560172424.896 [s; MET]
Trigger Stop: 560172441.28 [s; MET]
UTC: 2018-10-02T11:26:43.208360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 64.7359539590011 Dec: 15.2332960680922 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.24
Image Trigger?: NO
Rate S/N Ratio: 7.54983443527075 [ if not an image trigger ]
Image S/N Ratio: 9.24
Analysis Position: [ source = BAT ]
RA: 64.7359539590011 Dec: 15.2332960680922 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 64.7393458792767 Dec: 15.2476624483475 [deg; J2000]
{ 04h 18m 57.4s , +15d 14' 51.6" }
+/- 1.81317900222877 [arcmin] (estimated 90% radius based on SNR)
+/- 0.736842485603701 [arcmin] (formal 1-sigma fit error)
SNR: 12.9992233901257
Angular difference between the analysis and refined position is 0.884065 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 63.4079999923706 +/- 12.3483206791846
Measured from: -22.8719999790192
to: 40.5360000133514 [s; relative to TRIGTIME]
T50: 27.0879999399185 +/- 7.66198305220237
Measured from: -0.759999990463257
to: 26.3279999494553 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 11.3880000114441
to: 12.3880000114441 [s; relative to TRIGTIME]
Total Fluence
Measured from: -28.37600004673
to: 43.62399995327 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.682027 0.651445 0.312678 0.079195
0.066987 0.068988 0.059204 0.050881 [error]
Peak 0.028322 0.029710 0.012539 0.002164
0.008142 0.008156 0.006976 0.005932 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 72.000 -28.376 43.624
T90 63.408 -22.872 40.536
T50 27.088 -0.760 26.328
Peak 1.000 11.388 12.388
====== 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 -2.153 -0.244 0.225 - - - 1.31e-03 -2.15e-04 2.09e-04 47.420 57
CPL -1.835 -0.245 1.001 21.306 N/A N/A 2.02e-03 N/A N/A 47.020 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 -2.073 -0.727 0.587 - - - 4.13e-03 -1.85e-03 1.69e-03 64.010 57
CPL -1.988 N/A N/A 11.981 N/A N/A 4.45e-03 N/A N/A 64.050 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 2.24e-07 2.77e-07 2.49e-07 3.89e-07 8.85e-07 1.14e-06 erg/cm2
90%_error_low -3.52e-08 -3.33e-08 -5.47e-08 -1.45e-07 -1.25e-07 -2.17e-07 erg/cm2
90%_error_hi 3.60e-08 3.31e-08 5.65e-08 1.92e-07 1.28e-07 2.52e-07 erg/cm2
Peak flux PL 2.96e-01 2.13e-01 1.01e-01 6.77e-02 6.42e-01 6.77e-01 ph/cm2/s
90%_error_low -1.24e-01 -6.76e-02 -5.49e-02 -6.77e-02 -1.99e-01 -2.12e-01 ph/cm2/s
90%_error_hi 1.31e-01 6.66e-02 5.79e-02 9.86e-02 1.99e-01 2.14e-01 ph/cm2/s
Fluence CPL 2.19e-07 2.88e-07 2.45e-07 2.16e-07 8.58e-07 9.69e-07 erg/cm2
90%_error_low -3.91e-08 N/A -6.15e-08 -1.67e-07 -1.38e-07 N/A erg/cm2
90%_error_hi 3.63e-08 N/A 5.95e-08 4.08e-07 1.44e-07 N/A erg/cm2
Peak flux CPL 2.91e-01 1.93e-01 8.97e-02 5.97e-02 6.19e-01 6.69e-01 ph/cm2/s
90%_error_low -1.45e-01 -1.93e-01 N/A -5.97e-02 N/A N/A ph/cm2/s
90%_error_hi 1.36e-01 1.07e-01 N/A 5.84e-02 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 64.7393 15.2477 0.0149 32.9350 4.1658 1.7526560 12.999 TRIG_00865036 Foreground time interval of the image: -28.376 43.624 (delta_t = 72.000 [sec]) Background time interval of the image: -239.896 -28.376 (delta_t = 211.520 [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 -28.376 sec. to 43.624 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.15346 ( -0.243953 0.224855 ) Norm@50keV : 1.31491E-03 ( -0.000215435 0.000209037 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.42 using 59 PHA bins. # Reduced chi-squared = 0.8319 for 57 degrees of freedom # Null hypothesis probability = 8.131543e-01 Photon flux (15-150 keV) in 72 sec: 0.212519 ( -0.024619 0.024621 ) ph/cm2/s Energy fluence (15-150 keV) : 8.84894e-07 ( -1.25019e-07 1.28183e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -28.376 sec. to 43.624 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.83517 ( -0.244607 1.00152 ) Epeak [keV] : 21.3061 ( ) Norm@50keV : 2.01917E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 47.02 using 59 PHA bins. # Reduced chi-squared = 0.8396 for 56 degrees of freedom # Null hypothesis probability = 7.981175e-01 Photon flux (15-150 keV) in 72 sec: 0.210154 ( -0.025389 0.025073 ) ph/cm2/s Energy fluence (15-150 keV) : 8.58305e-07 ( -1.38222e-07 1.43729e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 11.388 sec. to 12.388 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.07282 ( -0.726946 0.586847 ) Norm@50keV : 4.13290E-03 ( -0.00184598 0.00168768 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.01 using 59 PHA bins. # Reduced chi-squared = 1.123 for 57 degrees of freedom # Null hypothesis probability = 2.439772e-01 Photon flux (15-150 keV) in 1 sec: 0.641678 ( -0.198823 0.198827 ) ph/cm2/s Energy fluence (15-150 keV) : 3.83116e-08 ( -1.44604e-08 1.53347e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.388 sec. to 12.388 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.98828 ( ) Epeak [keV] : 11.9811 ( ) Norm@50keV : 4.45372E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.05 using 59 PHA bins. # Reduced chi-squared = 1.144 for 56 degrees of freedom # Null hypothesis probability = 2.149296e-01 Photon flux (15-150 keV) in 1 sec: 0.618501 ( ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 63.408 sec. Hardness ratio (energy fluence ratio) = 0.899145256618
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.014983e-07 S(50-150 keV) = 3.83408e-07
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 = 6.460851429346581E-01, IMY = -4.705791420954174E-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: -239.896000 -28.376000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6294 22.0193 0.4 38.9 -27.1 8.3626 26.4 0.4 Crab 331.2719 59.7301 2.3 45.7 -179.1 2.2196 5.1 ------ UNKNOWN 119.1817 77.8229 2.9 45.1 -120.1 4.3896 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -28.376000 43.624000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.5289 22.1271 115.9 38.8 -27.1 0.0161 0.1 8.9 Crab 64.7394 15.2477 0.9 32.9 4.2 1.7525 13.0 ------ UNKNOWN 100.8703 22.1963 2.1 51.1 -41.8 3.0594 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 124.604600 962.164000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6258 22.0155 0.3 19.1 -107.6 35.0848 44.7 0.4 Crab 52.8147 -39.4648 4.0 55.8 17.1 11.7588 2.9 ------ UNKNOWN 61.4867 -4.8045 2.9 20.3 15.3 2.8569 4.0 ------ UNKNOWN 78.3889 33.8717 2.5 22.4 -143.0 3.0604 4.6 ------ UNKNOWN