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 Oct 23 23:27:30 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1102281
======================================================================
Trigger: 01102281 Segment: 000
BAT Trigger Time: 671438239.168 [s; MET]
Trigger Stop: 671438247.36 [s; MET]
UTC: 2022-04-12T06:36:50.220220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 123.968083384208 Dec: 30.3220864406175 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.2
Image Trigger?: NO
Rate S/N Ratio: 10.0498756211209 [ if not an image trigger ]
Image S/N Ratio: 7.2
Analysis Position: [ source = BAT ]
RA: 123.968083384208 Dec: 30.3220864406175 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 123.970479260828 Dec: 30.3388976897148 [deg; J2000]
{ 08h 15m 52.9s , +30d 20' 20.0" }
+/- 1.92918608985089 [arcmin] (estimated 90% radius based on SNR)
+/- 0.833783516843582 [arcmin] (formal 1-sigma fit error)
SNR: 11.8970986591548
Angular difference between the analysis and refined position is 1.016278 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 44.2599999904633 +/- 7.82742474991122
Measured from: -8.1360000371933
to: 36.12399995327 [s; relative to TRIGTIME]
T50: 21.4599999189377 +/- 6.70841859246074
Measured from: 0.644000053405762
to: 22.1039999723434 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.87600004673004
to: 7.87600004673004 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.9399999380112
to: 40.2360000610352 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.247515 0.469593 0.258136 0.058753
0.043700 0.044929 0.039043 0.033699 [error]
Peak 0.019332 0.025097 0.017726 0.006188
0.006270 0.006410 0.005527 0.004646 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 52.176 -11.940 40.236
T90 44.260 -8.136 36.124
T50 21.460 0.644 22.104
Peak 1.000 6.876 7.876
====== 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 -1.547 -0.213 0.208 - - - 1.25e-03 -1.66e-04 1.64e-04 57.250 57
CPL -0.465 -0.916 1.187 65.531 -14.883 98.062 4.74e-03 -4.74e-03 1.58e-02 53.030 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 -1.499 -0.507 0.495 - - - 4.26e-03 -1.22e-03 1.18e-03 56.170 57
CPL -1.490 -0.693 0.492 9999.260 -9999.260 -9999.260 4.28e-03 -1.23e-03 3.58e-02 56.170 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 8.68e-08 1.55e-07 2.12e-07 6.01e-07 6.12e-07 1.05e-06 erg/cm2
90%_error_low -1.65e-08 -1.96e-08 -3.68e-08 -1.90e-07 -8.84e-08 -2.28e-07 erg/cm2
90%_error_hi 1.72e-08 1.95e-08 3.69e-08 2.41e-07 8.99e-08 2.70e-07 erg/cm2
Peak flux PL 1.75e-01 1.76e-01 1.25e-01 1.41e-01 5.32e-01 6.17e-01 ph/cm2/s
90%_error_low -7.54e-02 -5.02e-02 -4.56e-02 -8.19e-02 -1.43e-01 -1.69e-01 ph/cm2/s
90%_error_hi 8.36e-02 4.90e-02 4.45e-02 1.33e-01 1.43e-01 1.73e-01 ph/cm2/s
Fluence CPL 7.55e-08 1.75e-07 2.16e-07 1.40e-07 5.56e-07 6.07e-07 erg/cm2
90%_error_low -1.93e-08 -2.61e-08 -4.43e-08 -9.78e-08 -9.60e-08 -1.37e-07 erg/cm2
90%_error_hi 1.97e-08 2.76e-08 4.26e-08 3.17e-07 1.01e-07 3.21e-07 erg/cm2
Peak flux CPL 1.79e-01 1.76e-01 1.24e-01 1.50e-01 5.34e-01 6.19e-01 ph/cm2/s
90%_error_low -8.78e-02 -5.01e-02 -4.37e-02 N/A -1.50e-01 -2.77e-01 ph/cm2/s
90%_error_hi 7.80e-02 5.80e-02 4.81e-02 N/A 1.44e-01 1.70e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 123.9705 30.3389 0.0162 16.3717 29.6809 1.0779759 11.897 TRIG_01102281 Foreground time interval of the image: -11.940 40.236 (delta_t = 52.176 [sec]) Background time interval of the image: -239.168 -11.940 (delta_t = 227.228 [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 -11.940 sec. to 40.236 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.54743 ( -0.212775 0.208003 ) Norm@50keV : 1.24582E-03 ( -0.000166159 0.000164327 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 57.25 using 59 bins. Reduced chi-squared = 1.00439 # Null hypothesis probability of 4.66e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 52.18 sec: 0.157601 ( -0.019695 0.019706 ) ph/cm2/s Energy fluence (15-150 keV) : 6.12285e-07 ( -8.83543e-08 8.99197e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.940 sec. to 40.236 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.465204 ( -0.91575 1.18658 ) Epeak [keV] : 65.5312 ( -14.8832 98.0619 ) Norm@50keV : 4.73945E-03 ( -0.00473945 0.0158465 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 53.03 using 59 bins. Reduced chi-squared = 0.946964 # Null hypothesis probability of 5.88e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 52.18 sec: 0.151243 ( -0.020414 0.020419 ) ph/cm2/s Energy fluence (15-150 keV) : 5.56014e-07 ( -9.59762e-08 1.00727e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 6.876 sec. to 7.876 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.49858 ( -0.507033 0.494537 ) Norm@50keV : 4.26320E-03 ( -0.00122339 0.00118176 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 56.17 using 59 bins. Reduced chi-squared = 0.985439 # Null hypothesis probability of 5.06e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.532023 ( -0.142778 0.142994 ) ph/cm2/s Energy fluence (15-150 keV) : 4.04585e-08 ( -1.24629e-08 1.28676e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.876 sec. to 7.876 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.49028 ( -0.689802 0.4951 ) Epeak [keV] : 9999.26 ( -9999.36 -9999.36 ) Norm@50keV : 4.27874E-03 ( -0.00122949 0.0357934 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 56.17 using 59 bins. Reduced chi-squared = 1.00304 # Null hypothesis probability of 4.69e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.534059 ( -0.149554 0.143795 ) ph/cm2/s Energy fluence (15-150 keV) : 4.06799e-08 ( -1.36061e-08 9.19132e-09 ) 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 = 2.552340665624958E-01, IMY = -1.454701450132551E-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: -239.168000 -11.940000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6424 22.0241 0.6 29.9 -73.6 9.1538 20.5 0.8 Crab
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -11.940000 40.236000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.4549 22.1105 0.0 30.1 -73.4 0.4176 2.8 11.5 Crab 123.9704 30.3389 1.0 16.4 29.7 1.0780 11.9 ------ UNKNOWN 96.0116 31.3919 2.3 22.8 -44.7 0.4782 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 105.332600 653.893200 654.832000 659.167400 660.832000 838.671800 840.832000 963.017500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6367 22.0053 1.1 36.9 -107.3 27.0476 10.9 0.6 Crab 196.4775 68.2167 7.3 55.6 11.3 5.2505 1.6 ------ UNKNOWN 117.7374 49.5448 2.8 19.8 -26.1 3.8940 4.1 ------ UNKNOWN