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: Fri Jul 29 23:22:13 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1046782
======================================================================
Trigger: 01046782 Segment: 000
BAT Trigger Time: 641829320 [s; MET]
Trigger Stop: 641829384 [s; MET]
UTC: 2021-05-04T13:54:53.041040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 222.376049651147 Dec: -30.5412476439381 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.45
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.45
Analysis Position: [ source = BAT ]
RA: 222.376049651147 Dec: -30.5412476439381 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 222.380218907227 Dec: -30.5566372634199 [deg; J2000]
{ 14h 49m 31.3s , -30d 33' 23.9" }
+/- 2.07561322345956 [arcmin] (estimated 90% radius based on SNR)
+/- 1.10311421513985 [arcmin] (formal 1-sigma fit error)
SNR: 10.7164774153803
Angular difference between the analysis and refined position is 0.948175 arcmin
Partial Coding Fraction: 0.53125 [ including projection effects ]
Duration
T90: 142.983999967575 +/- 9.32908560628313
Measured from: -14.1959999799728
to: 128.787999987602 [s; relative to TRIGTIME]
T50: 66.62399995327 +/- 18.2639536124136
Measured from: 28.7039999961853
to: 95.3279999494553 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 87.6840000152588
to: 88.6840000152588 [s; relative to TRIGTIME]
Total Fluence
Measured from: -22.5720000267029
to: 134.756000041962 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.437511 1.672824 1.280894 0.179709
0.112079 0.110843 0.097835 0.086969 [error]
Peak 0.030737 0.042601 0.027673 0.004077
0.009221 0.009380 0.008290 0.007446 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 157.328 -22.572 134.756
T90 142.984 -14.196 128.788
T50 66.624 28.704 95.328
Peak 1.000 87.684 88.684
====== 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 -1.626 -0.129 0.127 - - - 1.87e-03 -1.43e-04 1.42e-04 61.750 57
CPL -0.991 -0.503 0.568 75.620 -17.077 96.529 4.02e-03 -1.79e-03 3.82e-03 56.940 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 -1.633 -0.502 0.469 - - - 6.83e-03 -1.94e-03 1.83e-03 43.800 57
CPL -1.643 -1.476 1.019 9999.350 N/A N/A 6.79e-03 N/A N/A 43.810 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 4.23e-07 7.20e-07 9.32e-07 2.44e-06 2.74e-06 4.52e-06 erg/cm2
90%_error_low -4.85e-08 -5.24e-08 -9.52e-08 -4.85e-07 -2.24e-07 -5.74e-07 erg/cm2
90%_error_hi 5.01e-08 5.23e-08 9.53e-08 5.61e-07 2.27e-07 6.35e-07 erg/cm2
Peak flux PL 3.19e-01 2.97e-01 1.92e-01 1.91e-01 8.87e-01 9.99e-01 ph/cm2/s
90%_error_low -1.24e-01 -7.48e-02 -7.03e-02 -1.11e-01 -2.18e-01 -2.50e-01 ph/cm2/s
90%_error_hi 1.35e-01 7.38e-02 6.92e-02 1.80e-01 2.18e-01 2.55e-01 ph/cm2/s
Fluence CPL 3.84e-07 7.68e-07 9.50e-07 9.73e-07 2.59e-06 3.08e-06 erg/cm2
90%_error_low -5.73e-08 -6.49e-08 -1.04e-07 -4.66e-07 -2.50e-07 -5.31e-07 erg/cm2
90%_error_hi 5.82e-08 6.66e-08 1.05e-07 9.96e-07 2.54e-07 1.01e-06 erg/cm2
Peak flux CPL 3.25e-01 2.96e-01 1.89e-01 2.12e-01 8.89e-01 1.00e+00 ph/cm2/s
90%_error_low N/A -7.41e-02 -1.45e-01 N/A -2.19e-01 -2.88e-01 ph/cm2/s
90%_error_hi N/A 7.52e-02 -4.19e-02 N/A 2.17e-01 2.48e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 222.3802 -30.5566 0.0179 24.3092 102.3842 2.1389541 10.716 TRIG_01046782 Foreground time interval of the image: -13.899 72.701 (delta_t = 86.600 [sec]) Background time interval of the image:
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 -22.572 sec. to 134.756 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.62618 ( -0.128779 0.126829 ) Norm@50keV : 1.87043E-03 ( -0.00014321 0.000142139 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 61.75 using 59 bins. Reduced chi-squared = 1.08333 # Null hypothesis probability of 3.10e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 157.3 sec: 0.242357 ( -0.01755 0.017568 ) ph/cm2/s Energy fluence (15-150 keV) : 2.74358e-06 ( -2.24461e-07 2.27052e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -22.572 sec. to 134.756 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.990511 ( -0.503197 0.567745 ) Epeak [keV] : 75.6203 ( -17.0768 96.5284 ) Norm@50keV : 4.01660E-03 ( -0.0017876 0.00382148 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 56.94 using 59 bins. Reduced chi-squared = 1.01679 # Null hypothesis probability of 4.40e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 157.3 sec: 0.234829 ( -0.018476 0.018485 ) ph/cm2/s Energy fluence (15-150 keV) : 2.59285e-06 ( -2.49766e-07 2.54088e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 87.684 sec. to 88.684 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.63282 ( -0.502184 0.468722 ) Norm@50keV : 6.83250E-03 ( -0.00194132 0.00182936 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 43.80 using 59 bins. Reduced chi-squared = 0.768421 # Null hypothesis probability of 9.00e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.887201 ( -0.217696 0.217999 ) ph/cm2/s Energy fluence (15-150 keV) : 6.36664e-08 ( -1.86314e-08 1.92881e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 87.684 sec. to 88.684 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.19086 ( -0.928019 1.56728 ) Epeak [keV] : 71.7917 ( ) Norm@50keV : 3.37232E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 43.10 using 59 bins. Reduced chi-squared = 0.769643 # Null hypothesis probability of 8.97e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.888996 ( -0.219059 0.217194 ) ph/cm2/s Energy fluence (15-150 keV) : 4.38874e-08 ( -2.29371e-08 1.38637e-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 = -9.687597821372994E-02, IMY = -4.411990679406040E-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:
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -13.899400 72.700600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9582 -15.6448 1.2 35.3 54.4 2.8668 9.7 1.3 Sco X-1 253.0300 -5.2136 3.6 43.6 38.3 1.1251 3.2 ------ UNKNOWN 222.3802 -30.5567 1.1 24.3 102.4 2.1399 10.7 ------ UNKNOWN 257.6188 21.9645 2.5 56.9 6.5 3.8812 4.5 ------ UNKNOWN 162.5345 -24.6872 3.0 46.9 -164.3 1.1075 3.9 ------ UNKNOWN 242.3738 41.0968 2.3 59.1 -20.6 4.1613 5.0 ------ UNKNOWN 214.2233 40.8022 2.2 50.6 -44.4 3.5224 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 194.900600 963.098900 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.2716 -60.4916 5.2 45.3 -54.8 7.3155 2.2 8.0 Cen X-3 186.8199 -62.8923 2.8 39.5 -63.3 8.0717 4.1 8.6 GX 301-2 244.9752 -15.6469 0.5 25.5 151.6 26.2393 24.5 0.5 Sco X-1 256.0001 -37.8499 1.4 28.7 -154.0 9.3332 8.3 0.7 4U 1700-377 256.3214 -36.6117 0.0 28.8 -156.6 1.7086 1.5 12.6 GX 349+2 262.9695 -24.7320 4.0 36.3 -176.9 3.3497 2.9 2.3 GX 1+4 264.9558 -44.4479 6.7 36.1 -143.1 2.0974 1.7 9.1 4U 1735-44 268.3650 -1.4328 5.2 52.4 157.4 8.3670 2.2 1.2 SW J1753.5-0127 270.0949 -25.0439 8.7 42.3 -173.2 1.9856 1.3 10.5 GX 5-1 270.3903 -25.6800 8.9 42.4 -172.2 1.9772 1.3 6.1 GRS 1758-258 274.0146 -14.0043 13.2 50.2 174.8 2.1236 0.9 2.0 GX 17+2 275.7301 -30.3577 0.0 45.6 -163.8 -0.4280 -0.3 10.1 H1820-303 284.9116 -24.9633 5.7 55.0 -167.2 5.6379 2.0 7.2 HT1900.1-2455 262.8318 -33.8809 55.9 34.3 -161.4 -0.2100 -0.2 8.3 GX 354-0 178.2650 -10.9374 4.1 45.2 18.1 5.0374 2.8 ------ UNKNOWN 173.3984 -13.6557 3.1 47.9 11.5 6.5303 3.8 ------ UNKNOWN 269.1511 -31.2926 2.6 39.9 -164.3 5.2101 4.4 ------ UNKNOWN 158.5170 -53.6977 3.6 50.6 -44.5 11.9416 3.2 ------ UNKNOWN