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 Nov 11 21:37:30 EST 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1048372
======================================================================
Trigger: 01048372 Segment: 000
BAT Trigger Time: 642709453.824 [s; MET]
Trigger Stop: 642709454.848 [s; MET]
UTC: 2021-05-14T18:23:46.806320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 2.94222114163308 Dec: -21.8920543361152 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 22.43
Image Trigger?: NO
Rate S/N Ratio: 128.61959415268 [ if not an image trigger ]
Image S/N Ratio: 22.43
Analysis Position: [ source = BAT ]
RA: 2.94222114163308 Dec: -21.8920543361152 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 2.94588278545436 Dec: -21.8971230227294 [deg; J2000]
{ 00h 11m 47.0s , -21d 53' 49.6" }
+/- 0.654102462409235 [arcmin] (estimated 90% radius based on SNR)
+/- 0.181302730326634 [arcmin] (formal 1-sigma fit error)
SNR: 55.7803898986487
Angular difference between the analysis and refined position is 0.366122 arcmin
Partial Coding Fraction: 0.796875 [ including projection effects ]
Duration
T90: 70.2079999446869 +/- 0.74051872877279
Measured from: -0.25600004196167
to: 69.9519999027252 [s; relative to TRIGTIME]
T50: 34.6959998607635 +/- 4.32132795543541
Measured from: 8.0440000295639
to: 42.7399998903275 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.519999980926514
to: 0.480000019073486 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.08399999141693
to: 75.1280000209808 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.853861 4.870782 3.243300 0.733942
0.068750 0.072753 0.063717 0.051830 [error]
Peak 0.236611 0.409192 0.384827 0.096096
0.011858 0.014471 0.014388 0.010239 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 76.212 -1.084 75.128
T90 70.208 -0.256 69.952
T50 34.696 8.044 42.740
Peak 1.000 -0.520 0.480
====== 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 -1.655 -0.043 0.043 - - - 1.04e-02 -2.26e-04 2.26e-04 39.960 57
CPL -1.451 -0.171 0.178 145.039 -43.310 393.341 1.29e-02 -2.10e-03 2.62e-03 35.800 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 -1.178 -0.070 0.070 - - - 7.48e-02 -2.99e-03 2.99e-03 58.400 57
CPL -0.594 -0.297 0.318 132.808 -28.579 78.051 1.39e-01 -3.69e-02 5.42e-02 46.480 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 1.17e-06 1.96e-06 2.49e-06 6.33e-06 7.37e-06 1.19e-05 erg/cm2
90%_error_low -5.14e-08 -4.90e-08 -6.90e-08 -3.97e-07 -1.66e-07 -4.33e-07 erg/cm2
90%_error_hi 5.24e-08 4.89e-08 6.88e-08 4.16e-07 1.66e-07 4.47e-07 erg/cm2
Peak flux PL 5.99e-04 1.02e-02 1.15e-01 1.04e+01 3.22e-01 1.05e+01 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A N/A ph/cm2/s
Fluence CPL 1.11e-06 1.98e-06 2.52e-06 4.81e-06 7.26e-06 1.04e-05 erg/cm2
90%_error_low -6.80e-08 -5.23e-08 -7.50e-08 -9.52e-07 -1.92e-07 -9.74e-07 erg/cm2
90%_error_hi 6.93e-08 5.26e-08 7.55e-08 1.24e-06 1.92e-07 1.25e-06 erg/cm2
Peak flux CPL 1.97e+00 2.86e+00 2.59e+00 2.12e+00 8.53e+00 9.54e+00 ph/cm2/s
90%_error_low -2.16e-01 -1.43e-01 -1.40e-01 -4.90e-01 -3.74e-01 -6.30e-01 ph/cm2/s
90%_error_hi 2.22e-01 1.44e-01 1.42e-01 6.71e-01 3.73e-01 7.58e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
2.9459 -21.8971 0.0035 16.0270 67.1769 5.3512328 55.780 TRIG_01048372
Foreground time interval of the image:
-1.084 17.077 (delta_t = 18.161 [sec])
Background time interval of the image:
-172.723 -1.084 (delta_t = 171.639 [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 -1.084 sec. to 75.128 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.65473 ( -0.0430464 0.0429695 ) Norm@50keV : 1.04085E-02 ( -0.000225937 0.0002259 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 39.96 using 59 bins. Reduced chi-squared = 0.701053 # Null hypothesis probability of 9.58e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 76.21 sec: 1.36127 ( -0.03391 0.03405 ) ph/cm2/s Energy fluence (15-150 keV) : 7.375e-06 ( -1.65555e-07 1.6553e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.084 sec. to 75.128 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.45056 ( -0.171268 0.178123 ) Epeak [keV] : 145.039 ( -43.3096 393.341 ) Norm@50keV : 1.29301E-02 ( -0.00209988 0.00262286 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 35.80 using 59 bins. Reduced chi-squared = 0.639286 # Null hypothesis probability of 9.84e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 76.21 sec: 1.33671 ( -0.03907 0.03931 ) ph/cm2/s Energy fluence (15-150 keV) : 7.25691e-06 ( -1.92406e-07 1.91811e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.520 sec. to 0.480 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.17758 ( -0.0697294 0.0697086 ) Norm@50keV : 7.48113E-02 ( -0.0029893 0.0029892 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 58.40 using 59 bins. Reduced chi-squared = 1.02456 # Null hypothesis probability of 4.24e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.321756 ( ) ph/cm2/s Energy fluence (15-150 keV) : 7.63959e-07 ( -3.45183e-08 3.46607e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.520 sec. to 0.480 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.593977 ( -0.297214 0.318422 ) Epeak [keV] : 132.808 ( -28.5789 78.0508 ) Norm@50keV : 0.139210 ( -0.0369165 0.0542434 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 46.48 using 59 bins. Reduced chi-squared = 0.83 # Null hypothesis probability of 8.14e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 8.52865 ( -0.37357 0.37344 ) ph/cm2/s Energy fluence (15-150 keV) : 7.39009e-07 ( -3.74729e-08 3.73632e-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 = 1.114222770807317E-01, IMY = -2.647645744731804E-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: -172.723410 -1.084000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 330.5718 1.5041 2.3 44.6 129.6 4.1614 5.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.084000 17.076620 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 330.4120 23.5693 2.2 54.1 156.1 2.5175 5.2 ------ UNKNOWN 2.9459 -21.8971 0.2 16.0 67.2 5.3513 55.8 ------ UNKNOWN 54.4112 -33.9403 2.7 44.2 -23.3 0.6891 4.3 ------ UNKNOWN 52.6280 -31.7791 2.7 42.0 -25.3 0.6208 4.2 ------ UNKNOWN 65.3303 -20.3327 2.9 50.5 -44.4 1.7093 4.0 ------ UNKNOWN 46.6599 15.7724 2.8 41.3 -100.7 1.4549 4.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 58.876600 962.208900 1353.176000 1553.226000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 318.7215 -36.1318 2.6 40.8 96.4 9.7638 4.5 ------ UNKNOWN 9.5969 -70.4527 3.0 48.7 34.0 10.5619 3.8 ------ UNKNOWN 318.6596 -1.6296 2.4 47.6 145.9 12.4764 4.9 ------ UNKNOWN 351.7683 -40.9557 3.4 21.3 60.7 2.6265 3.4 ------ UNKNOWN 335.3328 11.5328 3.9 43.0 175.1 3.9876 3.0 ------ UNKNOWN 332.1798 28.2098 3.0 58.2 -175.1 15.3857 3.8 ------ UNKNOWN 68.5810 -42.3512 2.8 57.7 -15.9 13.8911 4.1 ------ UNKNOWN 64.2148 -39.3824 4.1 54.4 -19.5 6.6626 2.8 ------ UNKNOWN 70.1557 -38.2264 2.9 59.1 -20.6 16.4411 3.9 ------ UNKNOWN 57.3986 -20.0489 2.9 50.6 -44.6 14.6406 3.9 ------ UNKNOWN