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: Thu Mar 17 18:38:28 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger673978
======================================================================
Trigger: 00673978 Segment: 000
BAT Trigger Time: 477342647.296 [s; MET]
Trigger Stop: 477342648.32 [s; MET]
UTC: 2016-02-16T19:10:31.443760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 311.705819095242 Dec: -71.5551525128288 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 20.11
Image Trigger?: NO
Rate S/N Ratio: 74.1822081094921 [ if not an image trigger ]
Image S/N Ratio: 20.11
Analysis Position: [ source = BAT ]
RA: 311.705819095242 Dec: -71.5551525128288 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 311.679122848348 Dec: -71.551175584486 [deg; J2000]
{ 20h 46m 43.0s , -71d 33' 04.2" }
+/- 0.877674346091035 [arcmin] (estimated 90% radius based on SNR)
+/- 0.298020110499877 [arcmin] (formal 1-sigma fit error)
SNR: 36.6497198679687
Angular difference between the analysis and refined position is 0.560201 arcmin
Partial Coding Fraction: 0.4765625 [ including projection effects ]
Duration
T90: 11 +/- 1
Measured from: -0.296000003814697
to: 10.7039999961853 [s; relative to TRIGTIME]
T50: 3 +/- 1
Measured from: 0.703999996185303
to: 3.7039999961853 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.703999996185303
to: 1.7039999961853 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.296000003814697
to: 11.7039999961853 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.657481 1.175387 0.868261 0.333834
0.044066 0.042930 0.037845 0.028508 [error]
Peak 0.170670 0.299652 0.280446 0.089232
0.014864 0.016073 0.015574 0.011078 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 12.000 -0.296 11.704
T90 11.000 -0.296 10.704
T50 3.000 0.704 3.704
Peak 1.000 0.704 1.704
====== 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 -1.477 -0.076 0.076 - - - 1.80e-02 -7.69e-04 7.69e-04 53.170 57
CPL -1.291 -0.221 0.306 205.569 -95.756 -205.569 2.20e-02 -4.56e-03 8.48e-03 51.960 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 -1.299 -0.099 0.099 - - - 6.06e-02 -3.47e-03 3.47e-03 57.820 57
CPL -1.070 -0.276 0.399 223.149 -223.149 -223.149 7.75e-02 -1.94e-02 4.02e-02 56.710 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 2.70e-07 5.03e-07 7.23e-07 2.20e-06 2.06e-06 3.70e-06 erg/cm2
90%_error_low -2.19e-08 -2.47e-08 -3.74e-08 -2.43e-07 -9.25e-08 -2.68e-07 erg/cm2
90%_error_hi 2.25e-08 2.45e-08 3.73e-08 2.63e-07 9.27e-08 2.83e-07 erg/cm2
Peak flux PL 2.06e+00 2.33e+00 1.90e+00 2.57e+00 7.22e+00 8.85e+00 ph/cm2/s
90%_error_low -2.23e-01 -1.58e-01 -1.26e-01 -3.42e-01 -4.34e-01 -5.19e-01 ph/cm2/s
90%_error_hi 2.31e-01 1.57e-01 1.25e-01 3.73e-01 4.35e-01 5.21e-01 ph/cm2/s
Fluence CPL 2.59e-07 5.11e-07 7.35e-07 1.70e-06 2.04e-06 3.21e-06 erg/cm2
90%_error_low -2.68e-08 -2.74e-08 -4.19e-08 -5.45e-07 -9.93e-08 -5.46e-07 erg/cm2
90%_error_hi 2.74e-08 2.78e-08 4.24e-08 4.89e-07 9.88e-08 6.03e-07 erg/cm2
Peak flux CPL 1.95e+00 2.37e+00 1.95e+00 2.03e+00 7.16e+00 8.30e+00 ph/cm2/s
90%_error_low -2.74e-01 -1.71e-01 -1.50e-01 -6.39e-01 -4.47e-01 -7.98e-01 ph/cm2/s
90%_error_hi 2.78e-01 1.74e-01 1.52e-01 6.83e-01 4.47e-01 8.71e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 311.6791 -71.5512 0.0052 41.2100 -24.7505 3.1328278 36.650 TRIG_00673978 Foreground time interval of the image: -0.296 11.704 (delta_t = 12.000 [sec]) Background time interval of the image: -183.995 -0.296 (delta_t = 183.699 [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 -0.296 sec. to 11.704 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.47654 ( -0.0762168 0.0763714 ) Norm@50keV : 1.80035E-02 ( -0.000769352 0.000769318 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.17 using 59 PHA bins. # Reduced chi-squared = 0.9328 for 57 degrees of freedom # Null hypothesis probability = 6.195570e-01 Photon flux (15-150 keV) in 12 sec: 2.23372 ( -0.10403 0.10433 ) ph/cm2/s Energy fluence (15-150 keV) : 2.05784e-06 ( -9.25332e-08 9.27144e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.296 sec. to 11.704 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.29073 ( -0.221465 0.306249 ) Epeak [keV] : 205.569 ( -95.7594 -205.572 ) Norm@50keV : 2.20498E-02 ( -0.0045609 0.00848125 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.96 using 59 PHA bins. # Reduced chi-squared = 0.9279 for 56 degrees of freedom # Null hypothesis probability = 6.283597e-01 Photon flux (15-150 keV) in 12 sec: 2.21104 ( -0.10937 0.10971 ) ph/cm2/s Energy fluence (15-150 keV) : 2.03597e-06 ( -9.93175e-08 9.87536e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.704 sec. to 1.704 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.29902 ( -0.0989439 0.0992783 ) Norm@50keV : 6.05545E-02 ( -0.0034721 0.0034721 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.82 using 59 PHA bins. # Reduced chi-squared = 1.014 for 57 degrees of freedom # Null hypothesis probability = 4.446499e-01 Photon flux (15-150 keV) in 1 sec: 7.22309 ( -0.43423 0.43498 ) ph/cm2/s Energy fluence (15-150 keV) : 5.98605e-07 ( -3.71564e-08 3.72821e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.704 sec. to 1.704 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.07019 ( -0.276201 0.398964 ) Epeak [keV] : 223.149 ( -223.15 -223.15 ) Norm@50keV : 7.75496E-02 ( -0.0193945 0.0402494 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 56.71 using 59 PHA bins. # Reduced chi-squared = 1.013 for 56 degrees of freedom # Null hypothesis probability = 4.482706e-01 Photon flux (15-150 keV) in 1 sec: 7.15594 ( -0.44682 0.44749 ) ph/cm2/s Energy fluence (15-150 keV) : 5.92134e-07 ( -3.90896e-08 3.88669e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 11.0 sec. Hardness ratio (energy fluence ratio) = 1.43740792418
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 7.729117e-07 S(50-150 keV) = 1.2849394e-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 = 7.952965612299452E-01, IMY = 3.666454410778809E-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: -183.995410 -0.296000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.4477 -62.9074 52.7 46.5 34.6 -0.1613 -0.2 10.0 GX 301-2 244.9813 -15.6386 0.5 26.7 151.3 7.0176 24.9 0.1 Sco X-1 256.0099 -37.8355 2.3 2.5 156.0 1.0488 4.9 1.2 4U 1700-377 256.3850 -36.4506 1.3 3.8 168.1 1.9021 9.2 2.9 GX 349+2 263.0609 -24.5955 12.6 16.3 -162.5 0.2165 0.9 9.4 GX 1+4 264.5343 -44.4665 4.7 6.9 -50.8 0.5512 2.5 9.0 4U 1735-44 268.4935 -1.5206 21.7 40.0 -164.0 -0.1797 -0.5 8.6 SW J1753.5-0127 270.2048 -24.9649 3.0 18.7 -142.2 0.8032 3.8 8.1 GX 5-1 270.1585 -25.7361 3.3 18.0 -141.0 0.7499 3.4 7.8 GRS 1758-258 274.0283 -14.0439 4.0 30.0 -147.6 0.6973 2.9 1.4 GX 17+2 275.8202 -30.5253 11.6 17.9 -118.4 0.2210 1.0 10.9 H1820-303 284.8341 -24.8159 0.0 27.7 -116.9 -0.2081 -0.7 12.7 HT1900.1-2455 263.1622 -33.6874 16.2 8.0 -143.6 0.1474 0.7 12.4 GX 354-0 208.7288 -39.9698 2.9 36.6 72.4 2.3980 4.0 ------ UNKNOWN 261.5580 -52.9951 2.7 13.2 -13.3 0.8803 4.3 ------ UNKNOWN 299.6454 -51.1736 3.0 31.1 -56.7 1.1013 3.9 ------ UNKNOWN 276.5805 16.8096 2.9 59.8 -160.2 7.3076 3.9 ------ UNKNOWN 289.5133 3.0040 3.2 52.3 -139.3 4.4000 3.7 ------ UNKNOWN 296.1957 -10.5746 3.4 45.4 -121.4 3.4317 3.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.296000 11.704000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.6850 -62.6022 5.0 46.4 35.1 0.4410 2.3 10.1 GX 301-2 244.8641 -15.4835 0.0 26.9 151.2 -0.1042 -1.6 11.5 Sco X-1 255.9133 -37.6915 153.0 2.7 155.6 0.0039 0.1 9.8 4U 1700-377 256.5166 -36.4324 14.0 3.8 169.7 0.0433 0.8 4.0 GX 349+2 263.0029 -24.7475 59.1 16.2 -162.5 -0.0107 -0.2 0.4 GX 1+4 264.9605 -44.5470 18.4 7.2 -51.7 0.0349 0.6 11.0 4U 1735-44 268.4553 -1.3065 15.6 40.2 -164.1 -0.0585 -0.7 10.2 SW J1753.5-0127 270.3476 -25.2226 6.9 18.5 -141.4 0.0855 1.7 9.3 GX 5-1 270.3029 -25.6743 13.8 18.1 -140.8 0.0508 1.0 4.1 GRS 1758-258 274.0041 -14.0271 78.0 30.0 -147.6 -0.0097 -0.1 0.6 GX 17+2 275.7599 -30.4130 4.7 17.9 -118.8 0.1371 2.4 9.0 H1820-303 284.8523 -24.8728 4.8 27.7 -116.8 0.1686 2.4 10.4 HT1900.1-2455 263.1642 -33.7325 7.5 8.0 -143.4 -0.0828 -1.5 10.7 GX 354-0 311.6791 -71.5512 0.3 41.2 -24.8 3.1324 36.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 80.404590 563.204600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 255.9795 -37.8883 4.6 43.7 179.0 1.7537 2.5 2.7 4U 1700-377 256.3601 -36.4926 3.9 44.9 -179.8 2.1217 3.0 5.5 GX 349+2 262.9056 -24.7739 8.4 54.1 -167.7 1.6959 1.4 5.9 GX 1+4 264.6124 -44.5355 2700.0 35.0 -175.7 0.0015 0.0 7.6 4U 1735-44 270.3231 -25.0785 3.5 51.9 -159.8 2.9349 3.3 2.1 GX 5-1 270.3897 -25.7839 5.7 51.2 -159.9 1.6644 2.0 5.3 GRS 1758-258 275.6926 -30.3413 4.9 45.6 -155.5 -1.5785 -2.3 12.1 H1820-303 285.0754 -24.9999 4.0 48.9 -142.8 2.6394 2.9 5.2 HT1900.1-2455 263.0703 -33.7416 5.0 45.5 -171.2 1.4937 2.3 6.9 GX 354-0 205.3216 -71.8877 4.0 29.1 107.7 2.0139 2.9 ------ UNKNOWN 358.7378 -79.9936 3.5 13.7 37.4 1.3128 3.3 ------ UNKNOWN 33.5660 -34.8779 3.9 54.6 -15.2 4.0055 3.0 ------ UNKNOWN 35.4370 -30.2585 2.5 59.5 -15.5 14.1060 4.6 ------ UNKNOWN 34.1660 -29.6776 2.4 59.6 -17.0 15.1090 4.9 ------ UNKNOWN 281.1433 -27.3834 3.2 47.3 -148.1 2.7648 3.6 ------ UNKNOWN