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: Wed Jul 22 21:58:28 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger980210
======================================================================
Trigger: 00980210 Segment: 000
BAT Trigger Time: 615174599.68 [s; MET]
Trigger Stop: 615174600.704 [s; MET]
UTC: 2020-06-30T01:49:34.479260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 91.379712975187 Dec: -60.7892931093061 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.07
Image Trigger?: NO
Rate S/N Ratio: 15.2643375224737 [ if not an image trigger ]
Image S/N Ratio: 9.07
Analysis Position: [ source = BAT ]
RA: 91.379712975187 Dec: -60.7892931093061 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 91.3775633191694 Dec: -60.7778529870176 [deg; J2000]
{ 06h 05m 30.6s , -60d 46' 40.3" }
+/- 1.7353114236228 [arcmin] (estimated 90% radius based on SNR)
+/- 0.656819639894147 [arcmin] (formal 1-sigma fit error)
SNR: 13.8404633259607
Angular difference between the analysis and refined position is 0.689288 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 14.8439998626709 +/- 2.78756657779575
Measured from: -0.247999906539917
to: 14.595999956131 [s; relative to TRIGTIME]
T50: 5.78799998760223 +/- 3.76132955911355
Measured from: 0.812000036239624
to: 6.60000002384186 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0640000104904175
to: 1.06400001049042 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.51199996471405
to: 16.6360000371933 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.255174 0.287314 0.175387 0.100633
0.032341 0.033640 0.029699 0.027808 [error]
Peak 0.038670 0.067342 0.046702 0.021192
0.008658 0.009195 0.008361 0.007174 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 17.148 -0.512 16.636
T90 14.844 -0.248 14.596
T50 5.788 0.812 6.600
Peak 1.000 0.064 1.064
====== 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 -1.636 -0.238 0.231 - - - 2.91e-03 -4.06e-04 3.95e-04 38.550 57
CPL -1.647 -0.228 0.277 9999.360 -9999.350 -9999.360 2.90e-03 -1.41e-03 2.58e-03 38.560 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 -1.260 -0.277 0.284 - - - 1.14e-02 -1.75e-03 1.74e-03 43.250 57
CPL -1.268 -1.028 0.517 9999.360 N/A N/A 1.14e-02 N/A N/A 43.270 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 7.25e-08 1.23e-07 1.58e-07 4.09e-07 4.65e-07 7.62e-07 erg/cm2
90%_error_low -1.41e-08 -1.51e-08 -3.00e-08 -1.42e-07 -6.91e-08 -1.72e-07 erg/cm2
90%_error_hi 1.46e-08 1.51e-08 3.01e-08 1.88e-07 7.05e-08 2.10e-07 erg/cm2
Peak flux PL 3.74e-01 4.34e-01 3.63e-01 5.11e-01 1.35e+00 1.68e+00 ph/cm2/s
90%_error_low -1.06e-01 -7.74e-02 -6.77e-02 -1.78e-01 -2.11e-01 -2.69e-01 ph/cm2/s
90%_error_hi 1.14e-01 7.52e-02 6.62e-02 2.33e-01 2.12e-01 2.76e-01 ph/cm2/s
Fluence CPL 7.38e-08 1.20e-07 1.57e-07 4.52e-07 4.70e-07 7.55e-07 erg/cm2
90%_error_low -1.96e-08 -9.49e-09 -3.71e-08 -2.97e-07 -9.49e-08 -2.56e-07 erg/cm2
90%_error_hi 1.79e-08 2.41e-08 3.88e-08 4.20e-08 8.73e-08 1.41e-07 erg/cm2
Peak flux CPL 3.74e-01 4.34e-01 3.63e-01 5.08e-01 1.36e+00 1.69e+00 ph/cm2/s
90%_error_low N/A N/A N/A N/A -2.84e-01 -3.48e-01 ph/cm2/s
90%_error_hi N/A N/A N/A N/A 2.65e-01 2.38e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 91.3776 -60.7779 0.0138 21.6697 72.4356 0.8934530 13.840 TRIG_00980210 Foreground time interval of the image: -0.512 16.636 (delta_t = 17.148 [sec]) Background time interval of the image: -239.680 -0.512 (delta_t = 239.168 [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 -0.512 sec. to 16.636 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.63624 ( -0.238134 0.23135 ) Norm@50keV : 2.91385E-03 ( -0.000405661 0.000395467 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 38.55 using 59 bins. Reduced chi-squared = 0.65339 # Null hypothesis probability of 9.71e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 17.15 sec: 0.378782 ( -0.046518 0.046546 ) ph/cm2/s Energy fluence (15-150 keV) : 4.65484e-07 ( -6.90558e-08 7.05157e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.512 sec. to 16.636 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.64654 ( -0.231296 0.273497 ) Epeak [keV] : 9999.36 ( -9999.35 -9999.36 ) Norm@50keV : 2.89780E-03 ( -0.00142125 0.0025597 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 38.55 using 59 bins. Reduced chi-squared = 0.65339 # Null hypothesis probability of 9.71e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 17.15 sec: 0.379345 ( -0.047672 0.046432 ) ph/cm2/s Energy fluence (15-150 keV) : 4.6991e-07 ( -9.49076e-08 8.73067e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.064 sec. to 1.064 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.25998 ( -0.276665 0.283544 ) Norm@50keV : 1.14338E-02 ( -0.00174626 0.0017442 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 43.25 using 59 bins. Reduced chi-squared = 0.733051 # Null hypothesis probability of 9.11e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.35454 ( -0.21101 0.21156 ) ph/cm2/s Energy fluence (15-150 keV) : 1.14146e-07 ( -1.96682e-08 1.98895e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.064 sec. to 1.064 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.23432 ( -0.0617722 1.48252 ) Epeak [keV] : 82.2825 ( ) Norm@50keV : 3.10478E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 43.25 using 59 bins. Reduced chi-squared = 0.733051 # Null hypothesis probability of 9.11e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.36392 ( -0.28387 0.26504 ) ph/cm2/s Energy fluence (15-150 keV) : 1.15792e-07 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 14.844 sec. Hardness ratio (energy fluence ratio) = 1.28679682537
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.9515596e-07 S(50-150 keV) = 2.703325e-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 = 1.199070457687570E-01, IMY = -3.788122716489350E-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: -239.680000 -0.512000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5474 -40.5109 1.7 39.4 11.8 2.5921 6.6 2.8 Vela X-1 158.9155 -56.8187 2.8 50.3 39.6 4.8327 4.2 ------ UNKNOWN 115.2451 -1.5108 3.1 48.0 -51.4 4.4148 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.512000 16.636000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4870 -40.5226 4.4 39.3 11.8 0.2216 2.6 2.7 Vela X-1 121.5340 -59.8383 2.8 31.1 46.2 0.3297 4.2 ------ UNKNOWN 91.3783 -60.7795 0.8 21.7 72.4 0.8948 13.9 ------ UNKNOWN 51.2770 -51.5202 2.6 25.1 134.3 0.2949 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 62.020600 962.446700 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5828 -40.5357 1.5 33.6 -23.9 7.9655 7.7 2.7 Vela X-1 170.2635 -60.5355 7.7 36.3 28.1 1.9101 1.5 5.5 Cen X-3 186.5899 -62.7421 32.3 40.9 38.6 -0.5247 -0.4 2.5 GX 301-2 12.4765 -51.9959 3.5 41.8 147.7 6.4201 3.3 ------ UNKNOWN 136.2312 -58.0273 3.4 22.5 5.8 2.9186 3.4 ------ UNKNOWN 101.7090 -57.7211 2.7 6.1 -32.8 3.3905 4.3 ------ UNKNOWN 125.2355 -32.5292 3.1 35.8 -43.9 4.5146 3.7 ------ UNKNOWN 61.7119 -23.8878 3.7 42.2 -139.7 4.7174 3.1 ------ UNKNOWN