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 15:12:22 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1154967
======================================================================
Trigger: 01154967 Segment: 000
BAT Trigger Time: 698363621.68 [s; MET]
Trigger Stop: 698363621.744 [s; MET]
UTC: 2023-02-17T21:53:10.903120 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 280.771001700138 Dec: -28.8556023658531 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.87
Image Trigger?: NO
Rate S/N Ratio: 111.458512460915 [ if not an image trigger ]
Image S/N Ratio: 8.87
Analysis Position: [ source = BAT ]
RA: 280.771001700138 Dec: -28.8556023658531 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 280.759365807531 Dec: -28.8402906043691 [deg; J2000]
{ 18h 43m 02.2s , -28d 50' 25.0" }
+/- 1.2799151408253 [arcmin] (estimated 90% radius based on SNR)
+/- 0.408644295977004 [arcmin] (formal 1-sigma fit error)
SNR: 21.3797397034596
Angular difference between the analysis and refined position is 1.103617 arcmin
Partial Coding Fraction: 0.2167969 [ including projection effects ]
Duration
T90: 1.37600004673004 +/- 0.440218153330795
Measured from: -0.0799999237060547
to: 1.29600012302399 [s; relative to TRIGTIME]
T50: 0.448000073432922 +/- 0.0815843606584965
Measured from: 0.0640000104904175
to: 0.51200008392334 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.251999974250793
to: 0.748000025749207 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.25599992275238
to: 1.8400000333786 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.460943 0.834593 1.127763 0.607533
0.049245 0.061100 0.066935 0.060409 [error]
Peak 0.343429 0.663702 1.030974 0.536721
0.039742 0.053315 0.061327 0.056271 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 2.096 -0.256 1.840
T90 1.376 -0.080 1.296
T50 0.448 0.064 0.512
Peak 1.000 -0.252 0.748
====== 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 -0.974 -0.117 0.119 - - - 1.01e-01 -6.90e-03 6.88e-03 54.270 57
CPL -0.872 -0.156 0.401 657.793 -657.793 -657.793 1.12e-01 -1.59e-02 5.17e-02 54.260 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 -0.845 -0.120 0.123 - - - 1.75e-01 -1.28e-02 1.27e-02 62.830 57
CPL -0.629 -0.340 0.498 387.179 -387.179 -387.179 2.17e-01 -5.09e-02 1.29e-01 62.170 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 1.65e-07 4.20e-07 8.55e-07 4.39e-06 2.31e-06 5.83e-06 erg/cm2
90%_error_low -2.27e-08 -3.55e-08 -6.28e-08 -7.01e-07 -1.66e-07 -7.36e-07 erg/cm2
90%_error_hi 2.38e-08 3.51e-08 6.24e-08 7.90e-07 1.67e-07 8.13e-07 erg/cm2
Peak flux PL 1.12e-03 9.00e-03 1.56e-01 1.37e+01 6.30e-01 1.39e+01 ph/cm2/s
90%_error_low -6.65e-05 N/A -8.87e-03 -9.30e-01 3.82e-02 -9.69e-01 ph/cm2/s
90%_error_hi 1.40e-03 N/A 1.37e-01 7.41e+00 6.16e-01 7.53e+00 ph/cm2/s
Fluence CPL 1.67e-07 4.22e-07 8.60e-07 4.32e-06 2.30e-06 5.48e-06 erg/cm2
90%_error_low -3.30e-08 -2.97e-08 -6.76e-08 -1.95e-06 -1.66e-07 -1.62e-06 erg/cm2
90%_error_hi 1.75e-08 3.77e-08 7.95e-08 5.11e-07 1.74e-07 4.26e-07 erg/cm2
Peak flux CPL 3.64e+00 5.82e+00 6.62e+00 1.10e+01 2.00e+01 2.71e+01 ph/cm2/s
90%_error_low -7.31e-01 -5.60e-01 -5.92e-01 -3.76e+00 -1.47e+00 -4.02e+00 ph/cm2/s
90%_error_hi 6.70e-01 5.64e-01 6.36e-01 3.16e+00 1.47e+00 3.94e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 280.7594 -28.8403 0.0090 49.1442 -18.0131 3.1176393 21.380 TRIG_01154967 Foreground time interval of the image: -0.256 1.840 (delta_t = 2.096 [sec]) Background time interval of the image: -239.680 -0.256 (delta_t = 239.424 [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 -0.256 sec. to 1.840 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.974149 ( -0.116988 0.119066 ) Norm@50keV : 0.100813 ( -0.0069036 0.00687858 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 54.27 using 59 bins. Reduced chi-squared = 0.952105 # Null hypothesis probability of 5.78e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 2.096 sec: 9.51637E-02 ( ) ph/cm2/s Energy fluence (15-150 keV) : 2.30648e-06 ( -1.66098e-07 1.66617e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.256 sec. to 1.840 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.872096 ( -0.128773 0.428322 ) Epeak [keV] : 657.793 ( -965.017 -965.017 ) Norm@50keV : 0.111696 ( -0.0118983 0.0556396 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 54.26 using 59 bins. Reduced chi-squared = 0.968929 # Null hypothesis probability of 5.41e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 2.096 sec: 11.5779 ( -0.8358 0.8191 ) ph/cm2/s Energy fluence (15-150 keV) : 2.29917e-06 ( -1.65967e-07 1.73591e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.252 sec. to 0.748 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.845332 ( -0.120158 0.122842 ) Norm@50keV : 0.175407 ( -0.0128031 0.0127317 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 62.83 using 59 bins. Reduced chi-squared = 1.10228 # Null hypothesis probability of 2.78e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.630385 ( 0.038211 0.615735 ) ph/cm2/s Energy fluence (15-150 keV) : 2.01196e-06 ( -1.52187e-07 1.52602e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.252 sec. to 0.748 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.628871 ( -0.339746 0.498266 ) Epeak [keV] : 387.179 ( -387.179 -387.179 ) Norm@50keV : 0.216753 ( -0.0509434 0.128689 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 62.17 using 59 bins. Reduced chi-squared = 1.11018 # Null hypothesis probability of 2.66e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 20.0344 ( -1.4694 1.4707 ) ph/cm2/s Energy fluence (15-150 keV) : 3.85896e-08 ( -3.85894e-08 -3.77218e-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 = 1.099561992504283E+00, IMY = 3.575473926437373E-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: -239.680000 -0.256000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.2903 35.2370 3.4 33.6 97.8 -3.2392 -3.4 10.4 Her X-1 262.8961 -24.7392 10.4 50.9 3.4 0.8577 1.1 6.2 GX 1+4 268.3610 -1.4714 55.1 28.9 18.1 0.1332 0.2 1.2 SW J1753.5-0127 270.2218 -24.9758 5.8 48.1 -4.5 1.2404 2.0 7.1 GX 5-1 270.3430 -25.7330 3.5 48.7 -5.1 2.2274 3.3 2.3 GRS 1758-258 273.9333 -13.9080 6.3 36.5 -2.9 1.1931 1.8 8.8 GX 17+2 275.8401 -30.3026 5.6 51.5 -13.0 -1.8478 -2.1 5.9 H1820-303 285.0945 -25.0438 6.5 44.9 -22.6 1.2833 1.8 8.1 HT1900.1-2455 288.9006 10.8157 3.8 9.0 -30.7 -1.5433 -3.0 9.8 GRS 1915+105 299.5662 35.1991 1.5 18.4 -176.2 3.9324 7.6 1.2 Cyg X-1 308.1518 40.9575 3.0 27.1 -172.4 1.9376 3.8 1.9 Cyg X-3 326.1533 38.1109 0.0 37.5 -154.2 -1.4600 -1.9 12.7 Cyg X-2 311.9838 65.3486 3.5 48.2 166.3 7.5846 3.3 ------ UNKNOWN 286.1854 14.6247 2.6 5.5 -5.2 2.2386 4.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.256000 1.840000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.3077 35.4885 0.0 33.7 98.2 0.0467 0.5 11.4 Her X-1 262.8866 -24.7569 6.6 50.9 3.4 -0.2341 -1.7 6.7 GX 1+4 268.5182 -1.3636 3.7 28.7 18.0 -0.1873 -3.1 10.5 SW J1753.5-0127 270.2733 -24.9871 5.1 48.1 -4.6 -0.2569 -2.2 5.6 GX 5-1 270.3624 -25.8475 23.0 48.8 -5.1 0.0542 0.5 7.1 GRS 1758-258 274.1562 -13.9396 14.3 36.5 -3.2 -0.0536 -0.8 10.5 GX 17+2 275.8102 -30.3539 39.0 51.5 -13.0 0.0501 0.3 6.0 H1820-303 285.1577 -24.9613 10.1 44.8 -22.7 0.1225 1.1 7.1 HT1900.1-2455 288.6315 10.9519 281.7 8.8 -29.0 0.0020 0.0 9.8 GRS 1915+105 299.4395 35.2732 19.2 18.4 -176.6 -0.0289 -0.6 8.5 Cyg X-1 308.0008 41.0600 8.5 27.1 -172.8 0.0736 1.4 8.1 Cyg X-3 326.1872 38.3129 58.5 37.6 -154.5 0.0150 0.2 0.9 Cyg X-2 277.6204 68.5266 2.5 49.2 148.2 0.8253 4.6 ------ UNKNOWN 276.8460 -23.2320 3.2 44.4 -11.6 0.3337 3.6 ------ UNKNOWN 346.2560 55.8439 2.3 55.9 -171.7 1.0632 5.1 ------ UNKNOWN 280.7594 -28.8403 0.5 49.1 -18.0 3.1180 21.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 814.520600 962.453200 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 57.4508 -79.9327 3.7 48.2 166.3 3.9944 3.1 ------ UNKNOWN 19.8508 -28.5809 2.6 5.5 -4.9 1.3091 4.5 ------ UNKNOWN 347.4193 -18.6688 2.4 32.7 -75.6 2.3913 4.8 ------ UNKNOWN