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: Sun Nov 13 11:58:46 EST 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1010946
======================================================================
Trigger: 01010946 Segment: 000
BAT Trigger Time: 628671173.248 [s; MET]
Trigger Stop: 628671185.408 [s; MET]
UTC: 2020-12-03T06:52:27.160660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 38.0799197655575 Dec: -26.5375146309371 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.4
Image Trigger?: NO
Rate S/N Ratio: 14 [ if not an image trigger ]
Image S/N Ratio: 8.4
Analysis Position: [ source = BAT ]
RA: 38.0799197655575 Dec: -26.5375146309371 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 38.0547758527732 Dec: -26.5053405517262 [deg; J2000]
{ 02h 32m 13.1s , -26d 30' 19.2" }
+/- 1.92927508619372 [arcmin] (estimated 90% radius based on SNR)
+/- 1.1346427448692 [arcmin] (formal 1-sigma fit error)
SNR: 11.8963146579422
Angular difference between the analysis and refined position is 2.355586 arcmin
Partial Coding Fraction: 0.9140625 [ including projection effects ]
Duration
T90: 12.1840000152588 +/- 2.09745091306972
Measured from: -0.856000065803528
to: 11.3279999494553 [s; relative to TRIGTIME]
T50: 8.09599995613098 +/- 2.11640938663064
Measured from: 1.62000000476837
to: 9.71599996089935 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 11.4879999160767
to: 12.4879999160767 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.73199999332428
to: 12.8400000333786 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.146797 0.235692 0.111147 0.040718
0.025001 0.026124 0.022502 0.019237 [error]
Peak 0.025249 0.023028 0.013552 -0.000109
0.006430 0.006584 0.005714 0.004643 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 15.572 -2.732 12.840
T90 12.184 -0.856 11.328
T50 8.096 1.620 9.716
Peak 1.000 11.488 12.488
====== 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 -1.781 -0.267 0.251 - - - 1.99e-03 -3.42e-04 3.33e-04 69.650 57
CPL -1.172 -1.039 1.447 58.059 -21.665 -58.059 4.44e-03 -4.44e-03 2.61e-02 68.780 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 -2.004 -0.645 0.546 - - - 3.32e-03 -1.39e-03 1.32e-03 59.140 57
CPL -1.961 -0.156 1.961 33.771 -33.760 -33.771 3.54e-03 -3.54e-03 1.58e+01 59.140 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 5.16e-08 8.00e-08 9.31e-08 2.09e-07 2.86e-07 4.34e-07 erg/cm2
90%_error_low -1.04e-08 -1.13e-08 -2.13e-08 -8.23e-08 -4.94e-08 -1.07e-07 erg/cm2
90%_error_hi 1.08e-08 1.13e-08 2.17e-08 1.12e-07 5.08e-08 1.31e-07 erg/cm2
Peak flux PL 2.22e-01 1.66e-01 8.29e-02 5.90e-02 4.99e-01 5.30e-01 ph/cm2/s
90%_error_low -8.56e-02 -5.09e-02 -4.23e-02 -5.90e-02 -1.47e-01 -1.61e-01 ph/cm2/s
90%_error_hi 8.90e-02 5.00e-02 4.63e-02 8.14e-02 1.47e-01 1.65e-01 ph/cm2/s
Fluence CPL 4.89e-08 8.63e-08 9.15e-08 7.47e-08 2.68e-07 3.01e-07 erg/cm2
90%_error_low -1.19e-08 -1.50e-08 -2.60e-08 N/A -5.64e-08 -8.71e-08 erg/cm2
90%_error_hi 1.18e-08 1.69e-08 2.37e-08 N/A 6.04e-08 1.77e-07 erg/cm2
Peak flux CPL 2.22e-01 1.67e-01 8.30e-02 5.11e-02 4.99e-01 5.31e-01 ph/cm2/s
90%_error_low -8.74e-02 -7.75e-02 -8.30e-02 -5.11e-02 -1.69e-01 -1.58e-01 ph/cm2/s
90%_error_hi 8.81e-02 9.77e-02 4.61e-02 4.07e-02 1.47e-01 1.56e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 38.0548 -26.5053 0.0161 16.7346 -129.5056 0.5769580 11.896 TRIG_01010946 Foreground time interval of the image: -2.732 12.840 (delta_t = 15.572 [sec]) Background time interval of the image: -239.248 -2.732 (delta_t = 236.516 [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 -2.732 sec. to 12.840 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.78051 ( -0.266671 0.251486 ) Norm@50keV : 1.99429E-03 ( -0.000342221 0.000332643 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 69.65 using 59 bins. Reduced chi-squared = 1.22193 # Null hypothesis probability of 1.21e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 15.57 sec: 0.272775 ( -0.038544 0.038546 ) ph/cm2/s Energy fluence (15-150 keV) : 2.86121e-07 ( -4.93877e-08 5.08009e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.732 sec. to 12.840 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.17164 ( -1.0391 1.44735 ) Epeak [keV] : 58.0590 ( -21.6605 -58.0544 ) Norm@50keV : 4.44138E-03 ( -0.00444236 0.0261281 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 68.78 using 59 bins. Reduced chi-squared = 1.22821 # Null hypothesis probability of 1.17e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 15.57 sec: 0.266653 ( -0.040148 0.040045 ) ph/cm2/s Energy fluence (15-150 keV) : 2.67552e-07 ( -5.63981e-08 6.03914e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 11.488 sec. to 12.488 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.00439 ( -0.644865 0.546461 ) Norm@50keV : 3.31904E-03 ( -0.00139377 0.00132339 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 59.14 using 59 bins. Reduced chi-squared = 1.03754 # Null hypothesis probability of 3.97e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.498902 ( -0.147398 0.147469 ) ph/cm2/s Energy fluence (15-150 keV) : 3.06203e-08 ( -1.13246e-08 1.2363e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.488 sec. to 12.488 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.96078 ( -0.179765 1.93694 ) Epeak [keV] : 33.7714 ( -34.8736 -34.8852 ) Norm@50keV : 3.53871E-03 ( -0.0037001 15.801 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 59.14 using 59 bins. Reduced chi-squared = 1.05607 # Null hypothesis probability of 3.62e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.498797 ( -0.169263 0.147217 ) ph/cm2/s Energy fluence (15-150 keV) : 3.02294e-08 ( -1.64538e-08 1.18956e-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 = -1.912734942294735E-01, IMY = 2.319874738279152E-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: -239.248000 -2.732000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 76.6416 11.6244 2.4 40.8 96.6 4.4594 4.9 ------ UNKNOWN 95.9221 -35.5798 3.1 54.9 164.7 5.3502 3.7 ------ UNKNOWN 1.1369 33.2398 3.2 58.3 -1.9 5.1521 3.6 ------ UNKNOWN 12.3856 2.8346 2.4 32.2 -29.6 1.3886 4.9 ------ UNKNOWN 357.1987 11.3766 2.9 49.5 -27.2 2.3843 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -2.732000 12.840000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 65.3732 23.3064 3.8 40.6 72.2 0.5185 3.0 ------ UNKNOWN 21.3285 15.6321 2.2 33.0 -0.6 0.2868 5.1 ------ UNKNOWN 38.0548 -26.5054 1.0 16.7 -129.5 0.5773 11.9 ------ UNKNOWN 4.0892 14.2548 2.1 44.8 -19.5 0.4343 5.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 103.652600 242.832000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 103.4159 -35.1755 2.5 55.8 170.8 2.7319 4.7 ------ UNKNOWN 104.5366 -42.2535 2.2 55.6 179.4 2.6341 5.2 ------ UNKNOWN 358.9291 4.9963 2.5 49.3 -1.3 0.8419 4.6 306.6 UNKNOWN 4.4735 -1.5666 2.4 40.8 -3.1 0.6289 4.7 284.4 UNKNOWN 343.0172 -10.5836 2.6 54.1 -29.1 1.8212 4.3 ------ UNKNOWN 340.6823 -12.4658 2.5 55.4 -32.4 2.8170 4.6 ------ UNKNOWN