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 23:12:45 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1048783
======================================================================
Trigger: 01048783 Segment: 000
BAT Trigger Time: 642922108.608 [s; MET]
Trigger Stop: 642922109.12 [s; MET]
UTC: 2021-05-17T05:28:01.576140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 358.174322965366 Dec: -39.1049197741364 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.47
Image Trigger?: NO
Rate S/N Ratio: 19.5192212959431 [ if not an image trigger ]
Image S/N Ratio: 8.47
Analysis Position: [ source = BAT ]
RA: 358.174322965366 Dec: -39.1049197741364 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 358.189512339052 Dec: -39.1041292051999 [deg; J2000]
{ 23h 52m 45.5s , -39d 06' 14.9" }
+/- 2.04583340293305 [arcmin] (estimated 90% radius based on SNR)
+/- 0.910817769464141 [arcmin] (formal 1-sigma fit error)
SNR: 10.9400171080399
Angular difference between the analysis and refined position is 0.708803 arcmin
Partial Coding Fraction: 0.7890625 [ including projection effects ]
Duration
T90: 3.05600011348724 +/- 1.39942853899308
Measured from: -0.104000091552734
to: 2.95200002193451 [s; relative to TRIGTIME]
T50: 0.991999983787537 +/- 0.329848430388928
Measured from: 0.184000015258789
to: 1.17599999904633 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.180000066757202
to: 0.819999933242798 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.167999982833862
to: 3.12799990177155 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.112409 0.117755 0.060834 0.011695
0.014223 0.014726 0.011835 0.010065 [error]
Peak 0.061756 0.083627 0.035187 0.012114
0.008642 0.009105 0.007313 0.005845 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 3.296 -0.168 3.128
T90 3.056 -0.104 2.952
T50 0.992 0.184 1.176
Peak 1.000 -0.180 0.820
====== 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 -1.852 -0.260 0.246 - - - 4.98e-03 -8.72e-04 8.52e-04 67.730 57
CPL -0.979 -0.977 1.409 48.382 -16.471 -48.382 1.61e-02 -1.61e-02 9.88e-02 65.500 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 -1.779 -0.229 0.218 - - - 1.08e-02 -1.70e-03 1.68e-03 68.470 57
CPL 0.650 -1.409 2.005 46.252 -6.456 11.061 2.56e-01 -2.56e-01 3.18e+00 58.240 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 2.92e-08 4.33e-08 4.80e-08 1.00e-07 1.51e-07 2.21e-07 erg/cm2
90%_error_low -5.84e-09 -6.29e-09 -1.10e-08 -3.90e-08 -2.60e-08 -5.27e-08 erg/cm2
90%_error_hi 6.00e-09 6.28e-09 1.13e-08 5.27e-08 2.66e-08 6.34e-08 erg/cm2
Peak flux PL 5.80e-01 4.95e-01 2.88e-01 2.51e-01 1.47e+00 1.61e+00 ph/cm2/s
90%_error_low -1.12e-01 -6.86e-02 -5.72e-02 -8.31e-02 -2.04e-01 -2.27e-01 ph/cm2/s
90%_error_hi 1.16e-01 6.86e-02 5.76e-02 1.04e-01 2.04e-01 2.27e-01 ph/cm2/s
Fluence CPL 2.75e-08 4.85e-08 4.62e-08 2.49e-08 1.38e-07 1.47e-07 erg/cm2
90%_error_low -6.43e-09 -8.59e-09 -1.47e-08 N/A -2.81e-08 -3.59e-08 erg/cm2
90%_error_hi 6.46e-09 9.28e-09 1.30e-08 N/A 3.00e-08 9.55e-08 erg/cm2
Peak flux CPL 4.46e-01 6.41e-01 2.83e-01 2.46e-02 1.39e+00 1.39e+00 ph/cm2/s
90%_error_low -1.40e-01 -1.06e-01 -7.90e-02 -2.46e-02 -2.08e-01 -2.09e-01 ph/cm2/s
90%_error_hi 1.42e-01 1.10e-01 7.56e-02 6.23e-02 2.09e-01 2.12e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 358.1895 -39.1041 0.0174 17.6795 59.1062 0.3035949 10.940 TRIG_01048783 Foreground time interval of the image: -0.168 3.128 (delta_t = 3.296 [sec]) Background time interval of the image: -239.608 -0.168 (delta_t = 239.440 [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 -0.168 sec. to 3.128 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.85241 ( -0.260135 0.246014 ) Norm@50keV : 4.98189E-03 ( -0.000872253 0.000851568 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 67.73 using 59 bins. Reduced chi-squared = 1.18825 # Null hypothesis probability of 1.56e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 3.296 sec: 0.700981 ( -0.101592 0.101609 ) ph/cm2/s Energy fluence (15-150 keV) : 1.51004e-07 ( -2.59842e-08 2.66431e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.168 sec. to 3.128 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.9791 ( -0.976657 1.40894 ) Epeak [keV] : 48.3822 ( -16.4716 -48.3825 ) Norm@50keV : 1.61425E-02 ( -0.016142 0.098804 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 65.50 using 59 bins. Reduced chi-squared = 1.16964 # Null hypothesis probability of 1.80e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 3.296 sec: 0.684401 ( -0.102988 0.10317 ) ph/cm2/s Energy fluence (15-150 keV) : 1.38385e-07 ( -2.80613e-08 2.99787e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.180 sec. to 0.820 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.77938 ( -0.229124 0.218147 ) Norm@50keV : 1.07693E-02 ( -0.0017041 0.00167544 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 68.47 using 59 bins. Reduced chi-squared = 1.20123 # Null hypothesis probability of 1.42e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.47237 ( -0.20413 0.20417 ) ph/cm2/s Energy fluence (15-150 keV) : 9.92385e-08 ( -1.58761e-08 1.61573e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.180 sec. to 0.820 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.650391 ( -1.43356 1.98061 ) Epeak [keV] : 46.2521 ( -6.3817 11.1353 ) Norm@50keV : 0.256358 ( -0.270148 3.16881 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 58.24 using 59 bins. Reduced chi-squared = 1.04 # Null hypothesis probability of 3.93e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.39211 ( -0.2078 0.2086 ) ph/cm2/s Energy fluence (15-150 keV) : 8.4598e-08 ( -1.43183e-08 1.63319e-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 = 1.636593379262233E-01, IMY = -2.735224024754572E-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: -239.608000 -0.168000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 42.3231 -65.0125 3.5 50.1 26.4 3.5501 3.3 ------ UNKNOWN 318.6359 -4.6968 2.8 46.2 152.1 2.7202 4.1 ------ UNKNOWN 28.3906 -6.4829 2.7 29.0 -71.4 1.5877 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.168000 3.128000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 358.1895 -39.1041 1.0 17.7 59.1 0.3036 10.9 ------ UNKNOWN 341.9549 31.7016 2.2 57.2 -154.4 0.5603 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 50.892590 962.452000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 322.8268 6.9284 2.7 56.5 173.6 15.7234 4.3 ------ UNKNOWN 80.2454 -47.0264 3.1 57.7 -15.8 11.7771 3.7 ------ UNKNOWN 341.8970 15.9558 3.0 57.1 -161.5 13.1687 3.9 ------ UNKNOWN 359.0919 11.1470 3.7 50.3 -141.7 7.2871 3.1 ------ UNKNOWN 10.6898 6.1884 3.1 46.7 -125.6 11.2863 3.7 ------ UNKNOWN