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: Sat Oct 19 15:33:16 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1221714
======================================================================
Trigger: 01221714 Segment: 000
BAT Trigger Time: 734754069.696 [s; MET]
Trigger Stop: 734754073.792 [s; MET]
UTC: 2024-04-14T02:20:36.430320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 184.786463994455 Dec: 56.7270365800049 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.42
Image Trigger?: NO
Rate S/N Ratio: 13.6381816969859 [ if not an image trigger ]
Image S/N Ratio: 9.42
Analysis Position: [ source = BAT ]
RA: 184.786463994455 Dec: 56.7270365800049 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 184.834290108256 Dec: 56.7303046109192 [deg; J2000]
{ 12h 19m 20.2s , +56d 43' 49.1" }
+/- 1.47504062565921 [arcmin] (estimated 90% radius based on SNR)
+/- 0.809056209619622 [arcmin] (formal 1-sigma fit error)
SNR: 17.4570089469589
Angular difference between the analysis and refined position is 1.586422 arcmin
Partial Coding Fraction: 0.9140625 [ including projection effects ]
Duration
T90: 156.523999929428 +/- 170.215099926268
Measured from: -36.2879999876022
to: 120.235999941826 [s; relative to TRIGTIME]
T50: 39.8879998922348 +/- 5.27946964354756
Measured from: -12.3199999332428
to: 27.567999958992 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.03999996185303
to: 3.03999996185303 [s; relative to TRIGTIME]
Total Fluence
Measured from: -60.8880000114441
to: 315.180000066757 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.316245 3.395370 2.487336 0.585263
0.133885 0.143230 0.132751 0.132942 [error]
Peak 0.044545 0.065828 0.071390 0.023755
0.008254 0.008962 0.008539 0.008027 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 376.068 -60.888 315.180
T90 156.524 -36.288 120.236
T50 39.888 -12.320 27.568
Peak 1.000 2.040 3.040
====== 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 -1.483 -0.094 0.094 - - - 1.49e-03 -7.83e-05 7.80e-05 58.090 57
CPL -1.155 -0.361 0.409 125.675 -44.798 -125.675 2.19e-03 -7.31e-04 1.32e-03 55.860 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 -0.974 -0.231 0.241 - - - 1.28e-02 -1.72e-03 1.72e-03 64.270 57
CPL -0.674 -0.504 1.073 241.248 -241.248 -241.248 1.77e-02 -8.57e-03 3.56e-02 63.950 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 7.00e-07 1.30e-06 1.86e-06 5.63e-06 5.30e-06 9.49e-06 erg/cm2
90%_error_low -6.15e-08 -6.88e-08 -1.31e-07 -8.18e-07 -3.11e-07 -9.25e-07 erg/cm2
90%_error_hi 6.32e-08 6.86e-08 1.31e-07 9.13e-07 3.14e-07 1.00e-06 erg/cm2
Peak flux PL 3.20e-01 4.40e-01 4.48e-01 8.31e-01 1.47e+00 2.04e+00 ph/cm2/s
90%_error_low -8.38e-02 -7.40e-02 -6.62e-02 -2.38e-01 -2.00e-01 -3.01e-01 ph/cm2/s
90%_error_hi 9.13e-02 7.24e-02 6.54e-02 2.98e-01 2.01e-01 3.18e-01 ph/cm2/s
Fluence CPL 6.63e-07 1.34e-06 1.88e-06 3.33e-06 5.13e-06 7.22e-06 erg/cm2
90%_error_low -7.44e-08 -8.32e-08 -1.38e-07 -1.41e-06 -3.69e-07 -1.45e-06 erg/cm2
90%_error_hi 7.54e-08 8.48e-08 1.39e-07 2.54e-06 3.70e-07 2.58e-06 erg/cm2
Peak flux CPL 2.99e-01 4.50e-01 4.63e-01 5.91e-01 1.46e+00 1.80e+00 ph/cm2/s
90%_error_low -1.03e-01 -7.94e-02 -7.68e-02 -2.85e-01 -2.08e-01 -4.26e-01 ph/cm2/s
90%_error_hi 1.02e-01 8.26e-02 8.08e-02 3.15e-01 2.07e-01 4.47e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 184.8343 56.7303 0.0110 12.3260 -91.4361 6.8157229 17.457 TRIG_01221714 Foreground time interval of the image: -60.888 -21.288 (delta_t = 39.600 [sec]) -19.696 48.805 (delta_t = 68.501 [sec]) Background time interval of the image: -239.696 -60.888 (delta_t = 178.808 [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
Multiple GTIs in the spectrum tstart tstop -60.888000 -21.288200 -19.696000 315.180000 Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.48296 ( -0.0944074 0.0938532 ) Norm@50keV : 1.48796E-03 ( -7.82628e-05 7.79721e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 58.09 using 59 bins. Reduced chi-squared = 1.01912 # Null hypothesis probability of 4.35e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 374.5 sec: 0.184923 ( -0.009496 0.009504 ) ph/cm2/s Energy fluence (15-150 keV) : 5.30202e-06 ( -3.11432e-07 3.1404e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum tstart tstop -60.888000 -21.288200 -19.696000 315.180000 Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.15454 ( -0.360968 0.408842 ) Epeak [keV] : 125.675 ( -44.801 -125.678 ) Norm@50keV : 2.18885E-03 ( -0.000730609 0.00131528 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 55.86 using 59 bins. Reduced chi-squared = 0.9975 # Null hypothesis probability of 4.80e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 374.5 sec: 0.181359 ( -0.010326 0.010294 ) ph/cm2/s Energy fluence (15-150 keV) : 5.12593e-06 ( -3.69494e-07 3.70386e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.040 sec. to 3.040 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.974349 ( -0.23063 0.241142 ) Norm@50keV : 1.28209E-02 ( -0.00172361 0.00171851 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 64.27 using 59 bins. Reduced chi-squared = 1.12754 # Null hypothesis probability of 2.37e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.47427 ( -0.20013 0.20052 ) ph/cm2/s Energy fluence (15-150 keV) : 1.39936e-07 ( -2.06306e-08 2.08433e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.040 sec. to 3.040 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.673542 ( -0.5037 1.07327 ) Epeak [keV] : 241.248 ( -241.255 -241.255 ) Norm@50keV : 1.77408E-02 ( -0.00857384 0.0355997 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 63.95 using 59 bins. Reduced chi-squared = 1.14196 # Null hypothesis probability of 2.18e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.45701 ( -0.20763 0.20684 ) ph/cm2/s Energy fluence (15-150 keV) : 1.37079e-07 ( -2.28412e-08 2.24097e-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 = -5.476460409377755E-03, IMY = 2.184412084218914E-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: -239.696000 -60.888000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4196 35.3260 12.1 48.2 2.7 1.5318 1.0 2.1 Her X-1 143.5430 18.5700 2.6 47.2 176.2 6.3330 4.4 ------ UNKNOWN 270.6499 38.8631 2.3 57.2 -9.9 27.0403 5.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -60.888000 -21.288200 -19.696000 48.804590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4651 35.2408 14.4 48.3 2.7 -0.6850 -0.8 6.1 Her X-1 189.9442 35.4065 2.5 9.6 109.1 1.5430 4.6 ------ UNKNOWN 184.8342 56.7304 0.7 12.3 -91.4 6.8170 17.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 91.604600 212.204600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5901 35.3981 23.5 50.3 13.3 0.4181 0.5 7.3 Her X-1 161.5763 21.1432 2.8 39.5 144.8 2.6948 4.1 ------ UNKNOWN