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: Sun Mar 13 22:10:36 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger666378
======================================================================
Trigger: 00666378 Segment: 000
BAT Trigger Time: 471044610.048 [s; MET]
Trigger Stop: 471044611.456 [s; MET]
UTC: 2015-12-05T21:43:14.535740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 41.1585655544286 Dec: -43.4806088350113 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.42
Image Trigger?: NO
Rate S/N Ratio: 11.4017542509914 [ if not an image trigger ]
Image S/N Ratio: 7.42
Analysis Position: [ source = BAT ]
RA: 41.1585655544286 Dec: -43.4806088350113 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 41.1945299326002 Dec: -43.4610526003692 [deg; J2000]
{ 02h 44m 46.7s , -43d 27' 39.8" }
+/- 2.37981673017728 [arcmin] (estimated 90% radius based on SNR)
+/- 1.35419366422766 [arcmin] (formal 1-sigma fit error)
SNR: 8.81452827595583
Angular difference between the analysis and refined position is 1.956836 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 1.43599992990494 +/- 0.237587854202095
Measured from: -0.195999979972839
to: 1.2399999499321 [s; relative to TRIGTIME]
T50: 0.851999938488007 +/- 0.305470116322775
Measured from: 0.120000004768372
to: 0.971999943256378 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.112000048160553
to: 1.11200004816055 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.219999969005585
to: 1.31600004434586 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.047083 0.042630 0.043634 0.005907
0.007720 0.008159 0.007470 0.006779 [error]
Peak 0.037759 0.023027 0.025047 0.006138
0.006293 0.006617 0.006050 0.005474 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 1.536 -0.220 1.316
T90 1.436 -0.196 1.240
T50 0.852 0.120 0.972
Peak 1.000 0.112 1.112
====== 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 -1.605 -0.322 0.308 - - - 5.59e-03 -1.10e-03 1.07e-03 50.790 57
CPL -1.392 -0.525 1.251 132.033 -132.033 -132.033 7.29e-03 N/A N/A 50.670 56
=== 1-s peak 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 -1.817 -0.471 0.426 - - - 5.22e-03 -1.51e-03 1.40e-03 51.120 57
CPL -1.833 N/A N/A 9999.360 N/A N/A 5.19e-03 N/A N/A 51.120 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 1.21e-08 2.08e-08 2.74e-08 7.33e-08 8.02e-08 1.34e-07 erg/cm2
90%_error_low -3.15e-09 -3.61e-09 -7.17e-09 -3.29e-08 -1.67e-08 -4.08e-08 erg/cm2
90%_error_hi 3.30e-09 3.61e-09 7.23e-09 4.75e-08 1.73e-08 5.29e-08 erg/cm2
Peak flux PL 2.92e-01 2.43e-01 1.38e-01 1.16e-01 7.24e-01 7.90e-01 ph/cm2/s
90%_error_low -9.24e-02 -5.21e-02 -5.13e-02 -6.69e-02 -1.55e-01 -1.76e-01 ph/cm2/s
90%_error_hi 9.62e-02 5.21e-02 5.25e-02 1.09e-01 1.55e-01 1.80e-01 ph/cm2/s
Fluence CPL 1.18e-08 2.14e-08 2.76e-08 5.02e-08 7.85e-08 1.11e-07 erg/cm2
90%_error_low -3.57e-09 -4.10e-09 -7.49e-09 -4.10e-08 -1.84e-08 -4.69e-08 erg/cm2
90%_error_hi 3.44e-09 4.68e-09 7.62e-09 3.20e-08 1.85e-08 3.71e-08 erg/cm2
Peak flux CPL 2.75e-01 1.76e-01 7.63e-02 6.74e-02 5.52e-01 5.75e-01 ph/cm2/s
90%_error_low -1.09e-01 -7.18e-02 -7.63e-02 N/A -2.22e-01 N/A ph/cm2/s
90%_error_hi 8.46e-02 1.11e-01 6.55e-02 N/A 3.09e-01 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 41.1945 -43.4611 0.0218 21.7582 -24.8531 0.1334408 8.815 TRIG_00666378 Foreground time interval of the image: -0.220 1.316 (delta_t = 1.536 [sec]) Background time interval of the image: -239.048 -0.220 (delta_t = 238.828 [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 -0.220 sec. to 1.316 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.60453 ( -0.32219 0.307598 ) Norm@50keV : 5.58738E-03 ( -0.00109827 0.00106645 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.79 using 59 PHA bins. # Reduced chi-squared = 0.8911 for 57 degrees of freedom # Null hypothesis probability = 7.057520e-01 Photon flux (15-150 keV) in 1.536 sec: 0.719039 ( -0.124216 0.124243 ) ph/cm2/s Energy fluence (15-150 keV) : 8.0229e-08 ( -1.67498e-08 1.72636e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.220 sec. to 1.316 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.39185 ( -0.526329 1.2494 ) Epeak [keV] : 132.033 ( -131.538 -131.538 ) Norm@50keV : 7.28951E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.67 using 59 PHA bins. # Reduced chi-squared = 0.9048 for 56 degrees of freedom # Null hypothesis probability = 6.761575e-01 Photon flux (15-150 keV) in 1.536 sec: 0.713103 ( -0.127478 0.127289 ) ph/cm2/s Energy fluence (15-150 keV) : 7.85346e-08 ( -1.84199e-08 1.85033e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.112 sec. to 1.112 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.81695 ( -0.470491 0.425919 ) Norm@50keV : 5.22253E-03 ( -0.00150886 0.00140391 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.12 using 59 PHA bins. # Reduced chi-squared = 0.8968 for 57 degrees of freedom # Null hypothesis probability = 6.943532e-01 Photon flux (15-150 keV) in 1 sec: 0.724476 ( -0.154914 0.154917 ) ph/cm2/s Energy fluence (15-150 keV) : 4.80607e-08 ( -1.32847e-08 1.40233e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.112 sec. to 1.112 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.83285 ( ) Epeak [keV] : 9999.36 ( ) Norm@50keV : 5.18956E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.12 using 59 PHA bins. # Reduced chi-squared = 0.9129 for 56 degrees of freedom # Null hypothesis probability = 6.596634e-01 Photon flux (15-150 keV) in 1 sec: 0.551793 ( -0.222474 0.309474 ) ph/cm2/s Energy fluence (15-150 keV) : 4.24033e-08 ( -1.63298e-08 1.24812e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 1.436 sec. Hardness ratio (energy fluence ratio) = 1.31540666918
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.29294e-08 S(50-150 keV) = 4.729965e-08
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 = 3.621614184850643E-01, IMY = 1.677496858247010E-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: -239.048000 -0.220000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.6095 -40.6382 3.2 47.5 -169.1 1.6469 3.6 6.2 Vela X-1 68.9732 -2.5480 2.1 39.3 76.5 4.9731 5.5 ------ UNKNOWN 103.6878 -32.2672 3.0 27.7 160.0 1.0199 3.8 ------ UNKNOWN 136.1720 -27.7063 3.2 54.2 176.5 2.9230 3.6 ------ UNKNOWN 2.8813 -28.8823 3.2 55.5 -20.4 2.8722 3.7 ------ UNKNOWN 356.5996 -48.2141 4.8 50.8 -44.7 3.4605 2.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.220000 1.316000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4479 -40.7403 21.6 47.4 -169.0 -0.0167 -0.5 11.7 Vela X-1 105.7352 -23.0831 2.6 34.5 147.6 0.1037 4.4 ------ UNKNOWN 41.1945 -43.4611 1.3 21.8 -24.9 0.1335 8.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 388.252600 963.043200 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6277 22.0154 0.2 11.5 53.1 23.9116 51.8 0.3 Crab 102.6101 55.1267 2.7 29.0 173.3 2.2446 4.3 ------ UNKNOWN 96.2805 29.3254 3.1 2.8 -175.7 1.6587 3.7 ------ UNKNOWN 130.4894 66.2763 2.8 45.2 -176.4 3.4546 4.2 ------ UNKNOWN 95.9044 -26.3049 3.1 53.0 -16.3 4.7511 3.7 ------ UNKNOWN 116.9470 20.9473 3.4 20.7 -94.1 1.7670 3.4 ------ UNKNOWN 96.7245 -32.9141 3.0 59.6 -17.0 11.3294 3.9 ------ UNKNOWN 158.5695 44.1392 3.0 53.1 -142.2 12.8093 3.9 ------ UNKNOWN 118.5550 -18.7702 3.5 50.8 -44.5 9.1636 3.3 ------ UNKNOWN 141.8523 22.0630 3.2 42.5 -109.8 8.6472 3.6 ------ UNKNOWN