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: Mon May 20 17:21:26 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger899979
======================================================================
Trigger: 00899979 Segment: 000
BAT Trigger Time: 577666552 [s; MET]
Trigger Stop: 577666656 [s; MET]
UTC: 2019-04-22T22:55:29.215560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 182.124237954621 Dec: -60.2379723458902 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.54
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.54
Analysis Position: [ source = BAT ]
RA: 182.124237954621 Dec: -60.2379723458902 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 182.134686693791 Dec: -60.1692386477795 [deg; J2000]
{ 12h 08m 32.3s , -60d 10' 09.3" }
+/- 2.43777419334157 [arcmin] (estimated 90% radius based on SNR)
+/- 1.28307860168927 [arcmin] (formal 1-sigma fit error)
SNR: 8.51668448240087
Angular difference between the analysis and refined position is 4.135772 arcmin
Partial Coding Fraction: 0.828125 [ including projection effects ]
Duration
T90: 269.016000032425 +/- 50.7213055702129
Measured from: 18.2519999742508
to: 287.268000006676 [s; relative to TRIGTIME]
T50: 88.1599999666214 +/- 22.569598648955
Measured from: 105.723999977112
to: 193.883999943733 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 174.37600004673
to: 175.37600004673 [s; relative to TRIGTIME]
Total Fluence
Measured from: 6.42799997329712
to: 359.531999945641 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.796835 4.232050 2.536182 0.633619
0.147429 0.151678 0.131223 0.114973 [error]
Peak 0.081910 0.118972 0.086320 0.022703
0.009707 0.010608 0.009554 0.007395 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 353.104 6.428 359.532
T90 269.016 18.252 287.268
T50 88.160 105.724 193.884
Peak 1.000 174.376 175.376
====== 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 -1.776 -0.088 0.087 - - - 1.88e-03 -8.99e-05 8.93e-05 39.550 57
CPL -1.777 -0.086 0.117 9999.360 -9999.350 -9999.360 1.88e-03 -5.84e-04 7.40e-04 39.550 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 -1.509 -0.180 0.176 - - - 1.94e-02 -2.06e-03 2.03e-03 44.260 57
CPL -1.236 -0.427 0.747 137.363 -137.363 -137.363 2.68e-02 -1.07e-02 3.68e-02 43.750 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 1.10e-06 1.71e-06 2.00e-06 4.50e-06 6.13e-06 9.31e-06 erg/cm2
90%_error_low -8.36e-08 -7.65e-08 -1.33e-07 -6.15e-07 -3.01e-07 -7.24e-07 erg/cm2
90%_error_hi 8.57e-08 7.64e-08 1.33e-07 6.82e-07 3.03e-07 7.76e-07 erg/cm2
Peak flux PL 8.07e-01 8.07e-01 5.67e-01 6.32e-01 2.43e+00 2.81e+00 ph/cm2/s
90%_error_low -1.31e-01 -8.35e-02 -7.76e-02 -1.60e-01 -2.42e-01 -2.89e-01 ph/cm2/s
90%_error_hi 1.37e-01 8.30e-02 7.70e-02 1.91e-01 2.42e-01 2.92e-01 ph/cm2/s
Fluence CPL 1.10e-06 1.71e-06 2.00e-06 4.49e-06 6.15e-06 9.33e-06 erg/cm2
90%_error_low -8.37e-08 -7.85e-08 N/A N/A -4.06e-07 -1.78e-06 erg/cm2
90%_error_hi 8.58e-08 9.99e-08 N/A N/A 2.74e-07 3.78e-07 erg/cm2
Peak flux CPL 7.71e-01 8.29e-01 5.79e-01 4.52e-01 2.40e+00 2.63e+00 ph/cm2/s
90%_error_low -1.58e-01 -9.75e-02 -8.28e-02 -2.45e-01 -2.53e-01 -3.71e-01 ph/cm2/s
90%_error_hi 1.60e-01 1.01e-01 8.52e-02 2.32e-01 2.52e-01 4.37e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 182.1347 -60.1692 0.0225 15.8711 132.7921 10.6216547 8.517 TRIG_00899979 Foreground time interval of the image: 6.428 359.532 (delta_t = 353.104 [sec]) Background time interval of the image: -10.699 6.428 (delta_t = 17.127 [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 6.428 sec. to 359.532 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.77592 ( -0.0880226 0.0871109 ) Norm@50keV : 1.88415E-03 ( -8.98512e-05 8.92481e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 39.55 using 59 PHA bins. # Reduced chi-squared = 0.6938 for 57 degrees of freedom # Null hypothesis probability = 9.620763e-01 Photon flux (15-150 keV) in 353.1 sec: 0.257261 ( -0.011742 0.011781 ) ph/cm2/s Energy fluence (15-150 keV) : 6.13165e-06 ( -3.00858e-07 3.03039e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.428 sec. to 359.532 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.77694 ( -0.0871566 0.115928 ) Epeak [keV] : 9999.36 ( -9999.35 -9999.36 ) Norm@50keV : 1.88481E-03 ( -0.000585909 0.000738236 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 39.55 using 59 PHA bins. # Reduced chi-squared = 0.7063 for 56 degrees of freedom # Null hypothesis probability = 9.529894e-01 Photon flux (15-150 keV) in 353.1 sec: 0.257902 ( -0.014068 0.012154 ) ph/cm2/s Energy fluence (15-150 keV) : 6.15386e-06 ( -4.05585e-07 2.73573e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 174.376 sec. to 175.376 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.50945 ( -0.180246 0.176503 ) Norm@50keV : 1.94201E-02 ( -0.00205644 0.00203367 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 44.26 using 59 PHA bins. # Reduced chi-squared = 0.7764 for 57 degrees of freedom # Null hypothesis probability = 8.911494e-01 Photon flux (15-150 keV) in 1 sec: 2.43067 ( -0.24211 0.24223 ) ph/cm2/s Energy fluence (15-150 keV) : 1.83971e-07 ( -2.15359e-08 2.18359e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 174.376 sec. to 175.376 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.23638 ( -0.426854 0.747469 ) Epeak [keV] : 137.363 ( -137.363 -137.363 ) Norm@50keV : 2.68456E-02 ( -0.0107093 0.0368391 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.75 using 59 PHA bins. # Reduced chi-squared = 0.7813 for 56 degrees of freedom # Null hypothesis probability = 8.829475e-01 Photon flux (15-150 keV) in 1 sec: 2.40174 ( -0.25284 0.25163 ) ph/cm2/s Energy fluence (15-150 keV) : 1.79833e-07 ( -2.38275e-08 2.35947e-08 ) 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 = -1.931450815150185E-01, IMY = -2.086357058177104E-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: -10.699390 6.428000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.6932 -40.5491 2.1 20.4 -11.1 0.3363 5.4 7.5 Vela X-1 170.1711 -60.4878 5.9 10.0 133.0 -0.1143 -2.0 9.2 Cen X-3 186.4689 -62.8677 3.4 17.7 142.7 0.2256 3.4 7.8 GX 301-2 89.2729 -46.1924 2.5 38.0 -75.3 0.6260 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 6.428000 359.532000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.6801 -40.5299 3.6 20.4 -11.2 -3.6997 -3.2 7.1 Vela X-1 170.5562 -60.7177 5.5 10.2 134.3 -2.3621 -2.1 9.1 Cen X-3 186.5048 -62.8999 4.3 17.7 142.8 -3.3624 -2.7 8.8 GX 301-2 182.1346 -60.1692 1.3 15.9 132.8 10.6247 8.5 ------ UNKNOWN 322.9195 -65.3604 2.5 55.9 -160.4 20.6790 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 512.800600 963.131300 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5290 -40.5652 1.9 34.5 -22.3 5.2536 6.1 0.6 Vela X-1 169.9028 -60.6279 8.6 6.0 -44.6 -0.9243 -1.3 12.2 Cen X-3 186.7355 -62.7079 6.7 3.3 -165.6 1.2028 1.7 4.3 GX 301-2 255.8870 -37.9098 5.5 50.0 152.9 8.1731 2.1 6.1 4U 1700-377 264.5635 -44.4039 4.7 49.2 165.0 -6.9170 -2.4 8.2 4U 1735-44 224.8922 -31.2728 3.2 40.4 118.1 10.4013 3.6 ------ UNKNOWN 239.3925 -43.5048 3.0 37.6 144.5 6.4475 3.8 ------ UNKNOWN 167.2300 -38.6275 2.6 23.5 24.3 3.2954 4.5 ------ UNKNOWN 150.3519 -38.0669 3.0 29.8 -2.0 3.1857 3.8 ------ UNKNOWN 261.8027 -67.5806 2.8 33.3 -168.8 3.5735 4.1 ------ UNKNOWN