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: Wed Jun 14 15:15:18 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1152764
======================================================================
Trigger: 01152764 Segment: 000
BAT Trigger Time: 697285821.888 [s; MET]
Trigger Stop: 697285824.96 [s; MET]
UTC: 2023-02-05T10:29:51.184520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 202.072208101792 Dec: 46.6836265763065 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.58
Image Trigger?: NO
Rate S/N Ratio: 15.1657508881031 [ if not an image trigger ]
Image S/N Ratio: 6.58
Analysis Position: [ source = BAT ]
RA: 202.072208101792 Dec: 46.6836265763065 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 202.057051780186 Dec: 46.6855823698498 [deg; J2000]
{ 13h 28m 13.7s , +46d 41' 08.1" }
+/- 2.32910945096139 [arcmin] (estimated 90% radius based on SNR)
+/- 1.25094237053151 [arcmin] (formal 1-sigma fit error)
SNR: 9.08994767642737
Angular difference between the analysis and refined position is 0.634788 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 2.29999995231628 +/- 0.355105682948718
Measured from: 0.455999970436096
to: 2.75599992275238 [s; relative to TRIGTIME]
T50: 1.32799994945526 +/- 0.424867052812541
Measured from: 0.983999967575073
to: 2.31199991703033 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.74399995803833
to: 2.74399995803833 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.315999984741211
to: 2.87199997901917 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.073330 0.094789 0.072597 0.028195
0.014746 0.015528 0.013945 0.011427 [error]
Peak 0.046928 0.039507 0.032705 0.007689
0.009455 0.010307 0.008960 0.007189 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 2.556 0.316 2.872
T90 2.300 0.456 2.756
T50 1.328 0.984 2.312
Peak 1.000 1.744 2.744
====== 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: PL)
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 -1.439 -0.298 0.290 - - - 6.52e-03 -1.16e-03 1.15e-03 37.790 57
CPL -1.001 -0.711 1.512 112.848 -112.848 -112.848 1.09e-02 -5.49e-03 5.16e-02 37.380 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
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 -1.776 -0.487 0.418 - - - 6.92e-03 -2.11e-03 1.96e-03 44.170 57
CPL -1.746 -1.884 1.709 402.204 -402.194 -402.204 7.18e-03 -7.18e-03 4.93e-02 44.170 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 2.01e-08 3.83e-08 5.65e-08 1.79e-07 1.60e-07 2.94e-07 erg/cm2
90%_error_low -5.34e-09 -6.67e-09 -1.32e-08 -7.41e-08 -3.16e-08 -8.75e-08 erg/cm2
90%_error_hi 5.66e-09 6.61e-09 1.31e-08 1.02e-07 3.23e-08 1.11e-07 erg/cm2
Peak flux PL 3.71e-01 3.18e-01 1.86e-01 1.62e-01 9.45e-01 1.04e+00 ph/cm2/s
90%_error_low -1.24e-01 -7.55e-02 -7.17e-02 -9.57e-02 -2.25e-01 -2.56e-01 ph/cm2/s
90%_error_hi 1.32e-01 7.55e-02 7.08e-02 1.46e-01 2.25e-01 2.60e-01 ph/cm2/s
Fluence CPL 1.88e-08 4.03e-08 5.81e-08 9.29e-08 1.55e-07 2.10e-07 erg/cm2
90%_error_low -6.56e-09 -8.09e-09 -1.41e-08 -7.37e-08 -3.43e-08 -8.30e-08 erg/cm2
90%_error_hi 6.50e-09 8.89e-09 1.47e-08 2.03e-07 3.49e-08 1.17e-07 erg/cm2
Peak flux CPL 3.70e-01 3.19e-01 1.86e-01 1.56e-01 9.44e-01 1.03e+00 ph/cm2/s
90%_error_low -1.45e-01 -7.67e-02 -7.59e-02 -1.56e-01 -2.26e-01 -2.86e-01 ph/cm2/s
90%_error_hi 1.36e-01 9.77e-02 7.88e-02 9.02e-02 2.25e-01 2.62e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 202.0571 46.6856 0.0213 11.3250 174.1393 0.2508746 9.090 TRIG_01152764 Foreground time interval of the image: 0.316 2.872 (delta_t = 2.556 [sec]) Background time interval of the image: -239.888 0.316 (delta_t = 240.204 [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 0.316 sec. to 2.872 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.43876 ( -0.298135 0.289614 ) Norm@50keV : 6.51527E-03 ( -0.00116319 0.00114577 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 37.79 using 59 bins. Reduced chi-squared = 0.662982 # Null hypothesis probability of 9.77e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 2.556 sec: 0.800720 ( -0.135542 0.135599 ) ph/cm2/s Energy fluence (15-150 keV) : 1.59713e-07 ( -3.16274e-08 3.22514e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.316 sec. to 2.872 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.00091 ( -0.71085 1.51206 ) Epeak [keV] : 112.848 ( -112.844 -112.844 ) Norm@50keV : 1.09426E-02 ( -0.00548681 0.051557 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 37.38 using 59 bins. Reduced chi-squared = 0.6675 # Null hypothesis probability of 9.74e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 2.556 sec: 0.788264 ( -0.140834 0.139664 ) ph/cm2/s Energy fluence (15-150 keV) : 1.54504e-07 ( -3.43163e-08 3.49178e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.744 sec. to 2.744 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.77574 ( -0.487266 0.418079 ) Norm@50keV : 6.92121E-03 ( -0.00210856 0.00195745 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 44.17 using 59 bins. Reduced chi-squared = 0.774912 # Null hypothesis probability of 8.93e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.944954 ( -0.224618 0.224616 ) ph/cm2/s Energy fluence (15-150 keV) : 6.37911e-08 ( -1.89372e-08 1.95386e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.744 sec. to 2.744 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.7461 ( -1.88421 1.70918 ) Epeak [keV] : 402.204 ( -404.416 -404.426 ) Norm@50keV : 7.18276E-03 ( -0.00718372 0.0493428 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 44.17 using 59 bins. Reduced chi-squared = 0.78875 # Null hypothesis probability of 8.74e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.944409 ( -0.226002 0.224611 ) ph/cm2/s Energy fluence (15-150 keV) : 5.083e-08 ( -2.36637e-08 2.02112e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 2.3 sec. Hardness ratio (energy fluence ratio) = 1.47557021881
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.838132e-08 S(50-150 keV) = 1.0133119e-07
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 = -1.992266900346516E-01, IMY = -2.045001260735579E-02
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: -239.888000 0.316000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3488 35.2554 12.7 39.3 -97.8 1.5491 0.9 7.5 Her X-1 184.3494 88.5749 2.8 53.0 -174.3 7.8484 4.2 ------ UNKNOWN 215.3942 38.9156 2.5 8.5 -109.1 2.0900 4.7 ------ UNKNOWN 249.7256 19.7552 2.7 41.8 -73.3 6.2860 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.316000 2.872000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4918 35.2705 5.7 39.4 -97.9 -0.2484 -2.0 4.6 Her X-1 205.2538 -17.8457 2.5 53.5 6.7 0.4124 4.6 ------ UNKNOWN 202.0570 46.6856 1.3 11.3 174.1 0.2508 9.1 ------ UNKNOWN 234.8250 50.2787 2.2 25.7 -127.4 0.1797 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 80.412640 962.198600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4970 35.3706 9.3 40.3 -84.6 6.2911 1.2 2.6 Her X-1 147.9890 36.2684 2.5 41.0 104.0 19.8063 4.7 ------ UNKNOWN 173.7769 60.2035 2.4 21.3 148.2 8.3633 4.8 ------ UNKNOWN