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 v2.47
Process Start Time: Mon Jun 29 15:03:15 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger971846
======================================================================
Trigger: 00971846 Segment: 000
BAT Trigger Time: 611008420.864 [s; MET]
Trigger Stop: 611008424.96 [s; MET]
UTC: 2020-05-12T20:33:15.934300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 7.39573675700765 Dec: -2.1987561754583 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.66
Image Trigger?: NO
Rate S/N Ratio: 8.60232526704263 [ if not an image trigger ]
Image S/N Ratio: 7.66
Analysis Position: [ source = BAT ]
RA: 7.39573675700765 Dec: -2.1987561754583 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 7.41784616990268 Dec: -2.21881282972754 [deg; J2000]
{ 00h 29m 40.3s , -02d 13' 07.7" }
+/- 1.48726021100898 [arcmin] (estimated 90% radius based on SNR)
+/- 0.659821856858336 [arcmin] (formal 1-sigma fit error)
SNR: 17.252470570046
Angular difference between the analysis and refined position is 1.790344 arcmin
Partial Coding Fraction: 1.03125 [ including projection effects ]
Duration
T90: 74 +/- 14.3178210632764
Measured from: -0.863999962806702
to: 73.1360000371933 [s; relative to TRIGTIME]
T50: 26 +/- 8.24621125123532
Measured from: 5.1360000371933
to: 31.1360000371933 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.1360000371933
to: 4.1360000371933 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.8639999628067
to: 78.1360000371933 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.484927 0.545529 0.336512 0.102428
0.047357 0.048796 0.042825 0.037699 [error]
Peak 0.013906 0.021134 0.011540 0.009985
0.005237 0.005567 0.004921 0.004219 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 81.000 -2.864 78.136
T90 74.000 -0.864 73.136
T50 26.000 5.136 31.136
Peak 1.000 3.136 4.136
====== 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 -1.686 -0.183 0.177 - - - 1.07e-03 -1.20e-04 1.18e-04 71.720 57
CPL -1.280 -0.365 0.863 79.569 -33.127 -79.569 1.78e-03 -9.19e-04 3.50e-03 70.830 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 -1.330 -0.515 0.538 - - - 3.30e-03 -1.02e-03 1.01e-03 68.040 57
CPL -0.905 -1.133 9.805 107.262 -107.262 -107.262 5.89e-03 -3.60e-03 6.76e+02 68.050 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 1.31e-07 2.16e-07 2.68e-07 6.61e-07 8.02e-07 1.28e-06 erg/cm2
90%_error_low -1.97e-08 -2.13e-08 -4.06e-08 -1.85e-07 -9.44e-08 -2.27e-07 erg/cm2
90%_error_hi 2.03e-08 2.12e-08 4.09e-08 2.29e-07 9.61e-08 2.63e-07 erg/cm2
Peak flux PL 1.15e-01 1.29e-01 1.02e-01 1.35e-01 3.96e-01 4.81e-01 ph/cm2/s
90%_error_low -5.60e-02 -4.29e-02 -3.85e-02 -7.93e-02 -1.21e-01 -1.51e-01 ph/cm2/s
90%_error_hi 6.26e-02 4.15e-02 3.81e-02 1.34e-01 1.21e-01 1.58e-01 ph/cm2/s
Fluence CPL 1.26e-07 2.26e-07 2.68e-07 3.30e-07 7.67e-07 9.51e-07 erg/cm2
90%_error_low -2.28e-08 -2.75e-08 -4.41e-08 -2.24e-07 -1.11e-07 -2.55e-07 erg/cm2
90%_error_hi 2.28e-08 2.95e-08 4.33e-08 3.88e-07 1.13e-07 4.18e-07 erg/cm2
Peak flux CPL 1.14e-01 1.34e-01 1.03e-01 9.19e-02 3.93e-01 4.27e-01 ph/cm2/s
90%_error_low -1.14e-01 -4.81e-02 -7.91e-02 -9.19e-02 -1.63e-01 -1.97e-01 ph/cm2/s
90%_error_hi 6.41e-02 1.10e-01 4.16e-02 1.06e-01 1.21e-01 2.09e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
7.4178 -2.2188 0.0111 5.5341 -120.2395 1.1219337 17.252 TRIG_00971846
Foreground time interval of the image:
-2.864 36.037 (delta_t = 38.901 [sec])
Background time interval of the image:
-239.864 -2.864 (delta_t = 237.000 [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 -2.864 sec. to 78.136 sec. XSPEC12>exit XSPEC: quit Photon index: -1.686 ( -0.182632 0.177238 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.68600 ( -0.177238 0.182632 ) Norm@50keV : 1.06748E-03 ( -0.000119672 0.000117678 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 81 sec: 0.141093 ( -0.013916 0.01392 ) ph/cm2/s Energy fluence (15-150 keV) : 8.01613e-07 ( -9.44411e-08 9.61154e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.864 sec. to 78.136 sec. XSPEC: quit Photon index: -1.28024 ( -0.36503 0.863413 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.28024 ( -0.863413 0.36503 ) Epeak [keV] : 79.5686 ( -33.1283 -79.5698 ) Norm@50keV : 1.78496E-03 ( -0.000919215 0.00350162 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 81 sec: 0.138567 ( -0.014707 0.014628 ) ph/cm2/s Energy fluence (15-150 keV) : 7.67123e-07 ( -1.11091e-07 1.13389e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 3.136 sec. to 4.136 sec. XSPEC12>exit XSPEC: quit Photon index: -1.33044 ( -0.514706 0.53802 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.33044 ( -0.53802 0.514706 ) Norm@50keV : 3.30048E-03 ( -0.00102158 0.00101108 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 0.396053 ( -0.120611 0.120805 ) ph/cm2/s Energy fluence (15-150 keV) : 3.23832e-08 ( -1.10188e-08 1.14467e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.136 sec. to 4.136 sec. XSPEC: quit Photon index: -1.22072 ( -1.07782 9.86104 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.22072 ( -9.86104 1.07782 ) Epeak [keV] : 312.485 ( -301.679 -301.679 ) Norm@50keV : 3.81287E-03 ( -0.0015713 676.072 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 0.393225 ( -0.162878 0.120595 ) ph/cm2/s Energy fluence (15-150 keV) : 2.16132e-08 ( -8.0285e-09 2.09427e-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 = -4.879491044170665E-02, IMY = 8.370537712558727E-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: -239.864000 -2.864000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 3.1223 16.3380 2.7 23.2 -156.9 0.8905 4.3 ------ UNKNOWN 23.4540 22.0968 2.8 34.5 -121.5 1.4198 4.1 ------ UNKNOWN 58.1899 -33.2502 3.1 56.3 -28.2 3.9136 3.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -2.864000 36.036600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 338.9449 36.8423 2.5 49.7 179.3 0.8120 4.6 ------ UNKNOWN 39.3314 -48.1512 2.2 50.9 -3.5 0.8432 5.2 ------ UNKNOWN 7.4178 -2.2188 0.7 5.5 -120.2 1.1215 17.3 464.4 UNKNOWN 49.2708 -25.9409 2.2 46.8 -34.5 0.7984 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 58.636600 962.155800 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 326.1421 38.2873 5.0 55.5 169.3 9.1119 2.3 2.5 Cyg X-2 339.9712 -18.6350 4.2 31.5 84.9 3.0086 2.8 ------ UNKNOWN 32.3461 -54.2460 3.3 55.9 10.8 10.9412 3.5 ------ UNKNOWN 327.9215 42.0439 3.2 56.8 173.8 12.8551 3.6 ------ UNKNOWN 59.7356 -28.6836 4.4 56.3 -28.4 8.5525 2.7 ------ UNKNOWN