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 v2.48
Process Start Time: Wed Oct 19 23:43:40 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger996184
======================================================================
Trigger: 00996184 Segment: 000
BAT Trigger Time: 622007573.952 [s; MET]
Trigger Stop: 622007578.048 [s; MET]
UTC: 2020-09-17T03:52:28.303740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 235.753465520776 Dec: -4.69532441409532 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.11
Image Trigger?: NO
Rate S/N Ratio: 14 [ if not an image trigger ]
Image S/N Ratio: 9.11
Analysis Position: [ source = BAT ]
RA: 235.753465520776 Dec: -4.69532441409532 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 235.73582557468 Dec: -4.69085680206094 [deg; J2000]
{ 15h 42m 56.6s , -04d 41' 27.1" }
+/- 2.00266313250486 [arcmin] (estimated 90% radius based on SNR)
+/- 0.876865199195135 [arcmin] (formal 1-sigma fit error)
SNR: 11.2784637318641
Angular difference between the analysis and refined position is 1.088375 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 21 +/- 4.24264068711928
Measured from: -12.9520000219345
to: 8.04799997806549 [s; relative to TRIGTIME]
T50: 10 +/- 5
Measured from: -4.95200002193451
to: 5.04799997806549 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.04799997806549
to: 6.04799997806549 [s; relative to TRIGTIME]
Total Fluence
Measured from: -14.9520000219345
to: 10.0479999780655 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.325534 0.281063 0.109397 0.022409
0.037835 0.034429 0.030336 0.028872 [error]
Peak 0.028375 0.028009 0.013962 0.013688
0.007792 0.007226 0.005975 0.005832 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 25.000 -14.952 10.048
T90 21.000 -12.952 8.048
T50 10.000 -4.952 5.048
Peak 1.000 5.048 6.048
====== 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 -2.340 -0.319 0.290 - - - 1.35e-03 -3.01e-04 2.98e-04 36.520 57
CPL -1.661 -0.341 1.988 17.456 -17.072 21.926 3.68e-03 -3.68e-03 7.50e-02 35.780 56
=== 1-s peak 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 -1.849 -0.561 0.536 - - - 4.08e-03 -1.44e-03 1.38e-03 67.130 57
CPL -1.720 N/A N/A 67.727 N/A N/A 4.98e-03 N/A N/A 67.170 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 9.55e-08 1.06e-07 8.35e-08 1.09e-07 3.25e-07 3.94e-07 erg/cm2
90%_error_low -1.69e-08 -1.64e-08 -2.44e-08 -5.09e-08 -5.66e-08 -8.75e-08 erg/cm2
90%_error_hi 1.72e-08 1.60e-08 2.67e-08 7.68e-08 5.95e-08 1.08e-07 erg/cm2
Peak flux PL 2.35e-01 1.93e-01 1.07e-01 8.74e-02 5.73e-01 6.22e-01 ph/cm2/s
90%_error_low -9.67e-02 -5.52e-02 -4.67e-02 -5.62e-02 -1.65e-01 -1.81e-01 ph/cm2/s
90%_error_hi 1.02e-01 5.52e-02 4.97e-02 1.05e-01 1.65e-01 1.83e-01 ph/cm2/s
Fluence CPL 9.33e-08 1.13e-07 7.23e-08 2.73e-08 2.98e-07 3.06e-07 erg/cm2
90%_error_low -1.81e-08 -1.89e-08 -3.87e-08 N/A -6.41e-08 -7.24e-08 erg/cm2
90%_error_hi 1.73e-08 2.24e-08 3.38e-08 N/A 7.27e-08 9.04e-08 erg/cm2
Peak flux CPL 2.35e-01 1.92e-01 1.07e-01 8.78e-02 5.73e-01 6.24e-01 ph/cm2/s
90%_error_low -9.65e-02 -4.06e-02 -4.68e-02 -8.78e-02 -2.34e-01 -2.85e-01 ph/cm2/s
90%_error_hi 1.02e-01 1.43e-01 4.87e-02 7.21e-02 1.25e-01 1.26e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 235.7358 -4.6909 0.0171 12.4925 142.7631 0.8429618 11.278 TRIG_00996184 Foreground time interval of the image: -14.952 10.048 (delta_t = 25.000 [sec]) Background time interval of the image: -76.851 -14.952 (delta_t = 61.899 [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 -14.952 sec. to 10.048 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.34029 ( -0.319281 0.28963 ) Norm@50keV : 1.35040E-03 ( -0.000301326 0.00029765 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 36.52 using 59 bins. Reduced chi-squared = 0.640702 # Null hypothesis probability of 9.84e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 25 sec: 0.241428 ( -0.033316 0.033318 ) ph/cm2/s Energy fluence (15-150 keV) : 3.252e-07 ( -5.66037e-08 5.95422e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.952 sec. to 10.048 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.66055 ( -0.340553 1.98932 ) Epeak [keV] : 17.4564 ( -17.0478 21.9505 ) Norm@50keV : 3.68445E-03 ( -0.00367896 0.0749882 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 35.78 using 59 bins. Reduced chi-squared = 0.638929 # Null hypothesis probability of 9.84e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 25 sec: 0.235410 ( -0.034801 0.034426 ) ph/cm2/s Energy fluence (15-150 keV) : 2.97695e-07 ( -6.4075e-08 7.27383e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 5.048 sec. to 6.048 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.84888 ( -0.560654 0.535578 ) Norm@50keV : 4.08014E-03 ( -0.00143951 0.00138061 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 67.13 using 59 bins. Reduced chi-squared = 1.17772 # Null hypothesis probability of 1.69e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.573277 ( -0.164661 0.164742 ) ph/cm2/s Energy fluence (15-150 keV) : 3.75232e-08 ( -1.26025e-08 1.35073e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.048 sec. to 6.048 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 9.88469 ( ) Epeak [keV] : 27.6637 ( ) Norm@50keV : 1.15251E+06 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 66.13 using 59 bins. Reduced chi-squared = 1.18089 # Null hypothesis probability of 1.67e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.572980 ( -0.23363 0.125046 ) ph/cm2/s Energy fluence (15-150 keV) : 2.08128e-08 ( -6.50608e-09 2.29636e-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 = -1.763911785378280E-01, IMY = -1.340674952411572E-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: -76.851410 -14.952000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9918 -15.6330 0.4 26.6 148.3 4.7004 31.2 0.8 Sco X-1 254.3858 35.2366 6.1 41.0 47.8 0.5848 1.9 7.3 Her X-1 256.1341 -37.8892 6.2 49.8 161.0 -0.8724 -1.9 7.5 4U 1700-377 256.3502 -36.3886 6.0 48.8 159.5 0.8511 1.9 4.6 GX 349+2 263.0224 -24.6925 8.1 45.5 142.2 0.6253 1.4 3.3 GX 1+4 262.8367 -33.7486 0.0 50.7 152.2 2.5414 4.8 9.2 GX 354-0 266.5266 -1.8856 3.5 40.6 108.9 1.6818 3.3 ------ UNKNOWN 227.3369 40.7716 2.2 37.3 13.2 0.9109 5.2 ------ UNKNOWN 202.8535 37.4857 2.9 40.2 -17.3 0.7142 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -14.952000 10.048000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.8276 -15.5318 8.2 26.4 148.4 0.1335 1.4 10.9 Sco X-1 254.6221 35.3562 5.1 41.3 47.9 0.4325 2.3 8.1 Her X-1 256.1282 -37.8684 29.5 49.8 160.9 0.1078 0.4 6.9 4U 1700-377 256.3523 -36.2948 5.8 48.7 159.4 -0.5169 -2.0 8.7 GX 349+2 263.1381 -24.6947 4.9 45.6 142.2 -0.6376 -2.4 7.7 GX 1+4 262.8915 -33.8482 4.7 50.8 152.2 0.9179 2.5 4.9 GX 354-0 235.7358 -4.6909 1.0 12.5 142.8 0.8430 11.3 ------ UNKNOWN 188.9075 23.5250 2.5 41.3 -45.6 0.6671 4.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 83.948600 962.147400 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9918 -15.6406 0.2 14.2 136.2 71.5038 63.9 0.7 Sco X-1 254.4559 35.3443 83.6 43.7 17.4 0.2720 0.1 0.1 Her X-1 255.9755 -37.9650 18.0 38.0 149.0 1.4666 0.6 7.3 4U 1700-377 256.5004 -36.4173 6.8 37.0 146.9 3.5596 1.7 3.2 GX 349+2 262.8481 -24.8399 6.8 32.9 125.7 3.7056 1.7 10.4 GX 1+4 264.5676 -44.6099 7.1 47.2 147.3 -7.7379 -1.6 12.2 4U 1735-44 268.2172 -1.4992 4.0 32.6 80.6 6.1159 2.9 9.5 SW J1753.5-0127 270.1717 -25.0710 9.6 38.8 120.4 4.4841 1.2 6.1 GX 5-1 270.2399 -25.7854 3.7 39.2 121.4 11.6959 3.1 4.2 GRS 1758-258 273.8530 -14.0077 90.9 38.7 101.8 -0.4412 -0.1 9.1 GX 17+2 262.8692 -33.7834 7.3 38.5 137.7 4.3904 1.6 6.7 GX 354-0 242.9397 -49.8830 2.3 45.6 168.7 13.5071 5.0 ------ UNKNOWN 246.0286 51.2740 3.6 56.6 2.9 16.1833 3.2 ------ UNKNOWN 219.4372 6.4017 3.5 19.7 -60.7 4.2208 3.3 ------ UNKNOWN