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 23:18:40 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1104842
======================================================================
Trigger: 01104842 Segment: 000
BAT Trigger Time: 673127540.288 [s; MET]
Trigger Stop: 673127541.312 [s; MET]
UTC: 2022-05-01T19:51:51.225760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 85.5770464780323 Dec: 14.0334581384361 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.97
Image Trigger?: NO
Rate S/N Ratio: 23.832750575626 [ if not an image trigger ]
Image S/N Ratio: 8.97
Analysis Position: [ source = BAT ]
RA: 85.5770464780323 Dec: 14.0334581384361 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 85.5832914066446 Dec: 14.0101492310485 [deg; J2000]
{ 05h 42m 20.0s , +14d 00' 36.5" }
+/- 1.57869286779101 [arcmin] (estimated 90% radius based on SNR)
+/- 0.659957543053163 [arcmin] (formal 1-sigma fit error)
SNR: 15.842949112027
Angular difference between the analysis and refined position is 1.445010 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 202.239999890327 +/- 20.6013405693838
Measured from: 0.455999970436096
to: 202.695999860764 [s; relative to TRIGTIME]
T50: 40.703999876976 +/- 9.5580952067322
Measured from: 5.83200001716614
to: 46.5359998941422 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.27600002288818
to: 5.27600002288818 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.20799994468689
to: 224.200000047684 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.028229 1.620666 1.071470 0.090400
0.098440 0.101295 0.087238 0.076115 [error]
Peak 0.028821 0.046165 0.072346 0.019344
0.006893 0.007677 0.007248 0.005608 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 225.408 -1.208 224.200
T90 202.240 0.456 202.696
T50 40.704 5.832 46.536
Peak 1.000 4.276 5.276
====== 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 -1.542 -0.131 0.130 - - - 1.09e-03 -8.63e-05 8.58e-05 52.340 57
CPL -0.638 -0.575 0.660 72.310 -13.569 43.548 3.21e-03 -1.57e-03 3.74e-03 44.640 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 -0.742 -0.220 0.234 - - - 1.07e-02 -1.51e-03 1.48e-03 63.050 57
CPL 0.669 -1.204 1.718 117.054 -32.552 282.740 3.96e-02 -3.96e-02 1.34e-01 58.910 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 3.27e-07 5.86e-07 8.05e-07 2.29e-06 2.32e-06 4.01e-06 erg/cm2
90%_error_low -3.96e-08 -4.52e-08 -8.35e-08 -4.63e-07 -2.00e-07 -5.40e-07 erg/cm2
90%_error_hi 4.08e-08 4.51e-08 8.35e-08 5.36e-07 2.02e-07 5.99e-07 erg/cm2
Peak flux PL 2.14e-01 3.39e-01 4.05e-01 9.45e-01 1.23e+00 1.90e+00 ph/cm2/s
90%_error_low -5.94e-02 -6.21e-02 -5.34e-02 -2.42e-01 -1.66e-01 -2.77e-01 ph/cm2/s
90%_error_hi 6.67e-02 6.16e-02 5.33e-02 2.94e-01 1.67e-01 2.95e-01 ph/cm2/s
Fluence CPL 2.85e-07 6.42e-07 8.29e-07 6.86e-07 2.15e-06 2.44e-06 erg/cm2
90%_error_low -4.77e-08 -5.77e-08 -9.42e-08 -3.32e-07 -2.20e-07 -3.96e-07 erg/cm2
90%_error_hi 4.84e-08 5.94e-08 9.42e-08 7.05e-07 2.26e-07 7.20e-07 erg/cm2
Peak flux CPL 1.35e-01 3.43e-01 4.73e-01 3.55e-01 1.17e+00 1.31e+00 ph/cm2/s
90%_error_low -7.17e-02 -7.43e-02 -7.71e-02 -1.84e-01 -1.77e-01 -2.63e-01 ph/cm2/s
90%_error_hi 8.93e-02 7.18e-02 7.94e-02 4.41e-01 1.76e-01 4.60e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 85.5833 14.0101 0.0122 12.6026 -69.3460 4.1774770 15.843 TRIG_01104842 Foreground time interval of the image: -1.208 224.200 (delta_t = 225.408 [sec]) Background time interval of the image: -239.288 -1.208 (delta_t = 238.080 [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 -1.208 sec. to 224.200 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.54212 ( -0.131272 0.129692 ) Norm@50keV : 1.09259E-03 ( -8.63192e-05 8.5814e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 52.34 using 59 bins. Reduced chi-squared = 0.918246 # Null hypothesis probability of 6.50e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 225.4 sec: 0.138006 ( -0.010475 0.010483 ) ph/cm2/s Energy fluence (15-150 keV) : 2.32137e-06 ( -1.99623e-07 2.01841e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.208 sec. to 224.200 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.637833 ( -0.575051 0.659982 ) Epeak [keV] : 72.3096 ( -13.5687 43.548 ) Norm@50keV : 3.21493E-03 ( -0.00157032 0.00374097 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 44.64 using 59 bins. Reduced chi-squared = 0.797143 # Null hypothesis probability of 8.63e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 225.4 sec: 0.132342 ( -0.011049 0.011049 ) ph/cm2/s Energy fluence (15-150 keV) : 2.14894e-06 ( -2.20242e-07 2.25954e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 4.276 sec. to 5.276 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.742282 ( -0.220316 0.233725 ) Norm@50keV : 1.06849E-02 ( -0.00150641 0.00148203 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 63.05 using 59 bins. Reduced chi-squared = 1.10614 # Null hypothesis probability of 2.71e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.23142 ( -0.16577 0.16654 ) ph/cm2/s Energy fluence (15-150 keV) : 1.28009e-07 ( -1.74205e-08 1.74866e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.276 sec. to 5.276 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.668976 ( -1.20363 1.71753 ) Epeak [keV] : 117.054 ( -32.5497 282.742 ) Norm@50keV : 3.95915E-02 ( -0.0395939 0.134366 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 58.91 using 59 bins. Reduced chi-squared = 1.05196 # Null hypothesis probability of 3.69e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.16766 ( -0.177146 0.17648 ) ph/cm2/s Energy fluence (15-150 keV) : 1.21719e-07 ( -1.96086e-08 1.90477e-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 = 7.885979576074158E-02, IMY = 2.092046966218329E-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: -239.288000 -1.208000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6429 22.0295 0.5 18.3 -46.6 9.5155 23.7 1.1 Crab 104.6144 53.6492 2.2 44.4 4.9 3.2986 5.3 ------ UNKNOWN 95.9713 66.5758 2.8 57.0 -1.7 5.3451 4.1 ------ UNKNOWN 79.0586 44.3165 3.1 38.3 -22.6 1.9587 3.7 ------ UNKNOWN 75.5600 -18.8239 2.7 35.8 -143.5 2.0755 4.3 ------ UNKNOWN 70.8724 -19.0891 3.0 39.0 -138.4 2.1619 3.9 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.208000 224.200000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6026 22.1032 5.3 18.4 -46.5 -0.5526 -2.2 5.6 Crab 85.5833 14.0101 0.7 12.6 -69.3 4.1776 15.8 ------ UNKNOWN 67.1342 14.6940 2.1 30.2 -78.2 2.0125 5.5 ------ UNKNOWN 57.9159 58.6228 2.0 57.5 -24.2 8.6855 5.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: