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: Mon Oct 24 11:50:32 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1110090
======================================================================
Trigger: 01110090 Segment: 000
BAT Trigger Time: 676663340.48 [s; MET]
Trigger Stop: 676663348.672 [s; MET]
UTC: 2022-06-11T18:01:51.178200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 66.5264936478521 Dec: -37.2893134150936 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.49
Image Trigger?: NO
Rate S/N Ratio: 8.42614977317636 [ if not an image trigger ]
Image S/N Ratio: 7.49
Analysis Position: [ source = BAT ]
RA: 66.5264936478521 Dec: -37.2893134150936 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 66.504925058925 Dec: -37.2650458247997 [deg; J2000]
{ 04h 26m 01.2s , -37d 15' 54.2" }
+/- 2.11124995018527 [arcmin] (estimated 90% radius based on SNR)
+/- 0.990827558206799 [arcmin] (formal 1-sigma fit error)
SNR: 10.4590034252702
Angular difference between the analysis and refined position is 1.783389 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 57 +/- 12.369316876853
Measured from: 1.51999998092651
to: 58.5199999809265 [s; relative to TRIGTIME]
T50: 28 +/- 17.2626765016321
Measured from: 7.51999998092651
to: 35.5199999809265 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 9.51999998092651
to: 10.5199999809265 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.519999980926514
to: 61.5199999809265 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.413018 0.489580 0.276293 0.020451
0.065161 0.068169 0.060892 0.057085 [error]
Peak 0.011916 0.028697 0.007186 0.022634
0.008452 0.009133 0.008217 0.007521 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 61.000 0.520 61.520
T90 57.000 1.520 58.520
T50 28.000 7.520 35.520
Peak 1.000 9.520 10.520
====== 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 -1.873 -0.297 0.277 - - - 1.19e-03 -2.39e-04 2.32e-04 58.100 57
CPL -0.977 -1.167 1.924 44.483 -34.032 -44.483 4.15e-03 -4.15e-03 6.88e-02 56.580 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 -1.448 2.518 4.088 - - - 3.89e-03 -3.89e-03 -2.77e-03 59.870 57
CPL -1.566 3.475 5.008 9999.360 -9999.360 -9999.360 3.80e-03 -3.80e-03 -3.25e-03 59.910 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 1.31e-07 1.92e-07 2.10e-07 4.31e-07 6.66e-07 9.65e-07 erg/cm2
90%_error_low -2.85e-08 -3.11e-08 -5.53e-08 -1.87e-07 -1.30e-07 -2.58e-07 erg/cm2
90%_error_hi 2.93e-08 3.11e-08 5.73e-08 2.66e-07 1.34e-07 3.21e-07 erg/cm2
Peak flux PL 1.51e-01 1.58e-01 1.17e-01 1.39e-01 4.79e-01 5.64e-01 ph/cm2/s
90%_error_low -1.51e-01 -1.58e-01 -1.17e-01 -1.39e-01 -4.79e-01 -2.57e-01 ph/cm2/s
90%_error_hi 1.50e-01 -1.37e-01 7.36e-02 2.36e+00 -2.03e-01 2.02e+00 ph/cm2/s
Fluence CPL 1.26e-07 2.16e-07 1.92e-07 9.04e-08 5.96e-07 6.24e-07 erg/cm2
90%_error_low -3.08e-08 -3.32e-08 -8.96e-08 -8.46e-08 -1.48e-07 -1.76e-07 erg/cm2
90%_error_hi 3.10e-08 4.76e-08 6.91e-08 4.14e-07 1.64e-07 3.97e-07 erg/cm2
Peak flux CPL 1.27e-01 7.65e-02 5.10e-02 3.58e-02 4.81e-01 5.65e-01 ph/cm2/s
90%_error_low -1.27e-01 -7.65e-02 -5.10e-02 -3.58e-02 N/A N/A ph/cm2/s
90%_error_hi 1.52e-01 1.21e-01 3.85e-02 4.89e-02 N/A N/A ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 66.5049 -37.2650 0.0185 31.1492 6.5208 1.2927871 10.459 TRIG_01110090 Foreground time interval of the image: 0.520 50.021 (delta_t = 49.501 [sec]) Background time interval of the image: -239.480 0.520 (delta_t = 240.000 [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 0.520 sec. to 61.520 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.87251 ( -0.296789 0.277447 ) Norm@50keV : 1.18741E-03 ( -0.000238753 0.000232324 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 58.10 using 59 bins. Reduced chi-squared = 1.0193 # Null hypothesis probability of 4.35e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 61 sec: 0.168461 ( -0.027029 0.02703 ) ph/cm2/s Energy fluence (15-150 keV) : 6.6598e-07 ( -1.29838e-07 1.3437e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.520 sec. to 61.520 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.977163 ( -1.16682 1.92329 ) Epeak [keV] : 44.4829 ( -34.0267 -44.4776 ) Norm@50keV : 4.15486E-03 ( -0.00415737 0.0687958 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 56.58 using 59 bins. Reduced chi-squared = 1.01036 # Null hypothesis probability of 4.53e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 61 sec: 0.163868 ( -0.027603 0.027722 ) ph/cm2/s Energy fluence (15-150 keV) : 5.95511e-07 ( -1.47716e-07 1.64045e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 9.520 sec. to 10.520 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.99294 ( -0.92305 0.647128 ) Norm@50keV : 2.88527E-04 ( -0.00028802 0.000839446 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 56.97 using 59 bins. Reduced chi-squared = 0.999474 # Null hypothesis probability of 4.76e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.479136 ( -0.479136 -0.203151 ) ph/cm2/s Energy fluence (15-150 keV) : 3.74093e-08 ( -2.03693e-08 2.23658e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.520 sec. to 10.520 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 2.83694 ( -0.927608 0.605426 ) Epeak [keV] : 1.00000E+04 ( -10000 -10000 ) Norm@50keV : 1.36728E-04 ( -0.000136735 0.000413608 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 55.72 using 59 bins. Reduced chi-squared = 0.995 # Null hypothesis probability of 4.85e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.480592 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.84493e-08 ( -1.84466e-08 1.46653e-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 = 6.004993547405564E-01, IMY = -6.863945004957943E-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: -239.480000 0.520000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 92.4095 -53.9228 2.7 55.5 8.2 6.0682 4.3 ------ UNKNOWN 69.5920 -19.6019 2.8 24.0 -29.6 1.7073 4.1 ------ UNKNOWN 91.0460 -3.3139 2.7 45.6 -57.9 8.5807 4.3 ------ UNKNOWN 56.0595 34.9006 2.7 48.1 -129.2 8.1991 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.520000 50.020600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 66.5050 -37.2651 1.1 31.1 6.5 1.2928 10.5 ------ UNKNOWN 75.2448 -30.4594 2.4 32.8 -12.1 0.5747 4.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 131.620590 925.220590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.7375 -40.5384 5.3 52.5 12.6 4.6927 2.2 9.6 Vela X-1 134.6616 -27.9496 4.1 56.9 -1.9 8.2489 2.8 ------ UNKNOWN 97.4877 -1.5636 2.7 45.6 -57.9 22.4898 4.3 ------ UNKNOWN 76.8431 2.6680 2.1 41.1 -88.1 25.4140 5.4 ------ UNKNOWN