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 Mar 9 13:57:45 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1213095
======================================================================
Trigger: 01213095 Segment: 000
BAT Trigger Time: 728864019.648 [s; MET]
Trigger Stop: 728864020.16 [s; MET]
UTC: 2024-02-05T22:13:06.785960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 351.476523972014 Dec: -55.1321365645467 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.45
Image Trigger?: NO
Rate S/N Ratio: 18.9736659610103 [ if not an image trigger ]
Image S/N Ratio: 10.45
Analysis Position: [ source = BAT ]
RA: 351.476523972014 Dec: -55.1321365645467 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 351.465333655622 Dec: -55.1233334075089 [deg; J2000]
{ 23h 25m 51.7s , -55d 07' 24.0" }
+/- 0.479914411224784 [arcmin] (estimated 90% radius based on SNR)
+/- 0.0947940941370598 [arcmin] (formal 1-sigma fit error)
SNR: 86.8157812767943
Angular difference between the analysis and refined position is 0.652955 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 47.3040000200272 +/- 0.291671085279166
Measured from: 3.55999994277954
to: 50.8639999628067 [s; relative to TRIGTIME]
T50: 23.7159999608994 +/- 0.431147285626477
Measured from: 18.2599999904633
to: 41.9759999513626 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 39.067999958992
to: 40.067999958992 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.835999965667725
to: 79.0640000104904 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 22.038274 21.170568 9.650841 1.511587
0.099108 0.098782 0.075364 0.051067 [error]
Peak 1.630890 2.290718 1.670864 0.343674
0.023358 0.027469 0.024674 0.013251 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 79.900 -0.836 79.064
T90 47.304 3.560 50.864
T50 23.716 18.260 41.976
Peak 1.000 39.068 40.068
====== 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 -2.227 -0.027 0.027 - - - 3.55e-02 -4.82e-04 4.82e-04 49.730 57
CPL -1.988 1.988 0.081 2.778 -0.862 -0.349 4.50e-02 -1.52e-03 1.14e-03 41.020 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 -1.570 -0.033 0.033 - - - 3.79e-01 -6.92e-03 6.92e-03 66.670 57
CPL -1.161 -0.142 0.146 118.838 -16.693 31.871 5.71e-01 -7.39e-02 8.75e-02 41.140 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 7.20e-06 8.52e-06 7.28e-06 1.06e-05 2.68e-05 3.36e-05 erg/cm2
90%_error_low -2.18e-07 -1.50e-07 -1.12e-07 -3.72e-07 -3.93e-07 -4.65e-07 erg/cm2
90%_error_hi 2.21e-07 1.50e-07 1.12e-07 3.81e-07 3.93e-07 4.66e-07 erg/cm2
Peak flux PL 1.67e+01 1.61e+01 1.08e+01 1.14e+01 4.82e+01 5.51e+01 ph/cm2/s
90%_error_low -6.28e-01 -3.66e-01 -2.24e-01 -4.99e-01 -1.03e+00 -1.02e+00 ph/cm2/s
90%_error_hi 6.39e-01 3.66e-01 2.23e-01 5.12e-01 1.03e+00 1.03e+00 ph/cm2/s
Fluence CPL 6.70e-06 8.42e-06 6.99e-06 8.24e-06 2.53e-05 3.10e-05 erg/cm2
90%_error_low -1.64e-07 -1.57e-08 3.30e-07 -6.22e-07 5.98e-07 -4.83e-07 erg/cm2
90%_error_hi 2.16e-07 2.70e-07 5.46e-07 5.95e-07 1.32e-06 5.35e-07 erg/cm2
Peak flux CPL 1.76e+01 1.32e+01 6.86e+00 6.09e+00 4.02e+01 4.33e+01 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A 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 351.4653 -55.1233 0.0022 9.6945 -97.1075 54.6124363 86.816 TRIG_01213095 Foreground time interval of the image: -0.836 79.064 (delta_t = 79.900 [sec]) Background time interval of the image: -131.747 -0.836 (delta_t = 130.911 [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 -0.836 sec. to 79.064 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.22695 ( -0.0268896 0.0269177 ) Norm@50keV : 3.54811E-02 ( -0.000481618 0.000481515 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 49.73 using 59 bins. Reduced chi-squared = 0.872456 # Null hypothesis probability of 7.42e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 79.9 sec: 5.95913 ( -0.12458 0.12556 ) ph/cm2/s Energy fluence (15-150 keV) : 2.67656e-05 ( -3.92788e-07 3.92942e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.836 sec. to 79.064 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.99122 ( 1.99122 0.0843122 ) Epeak [keV] : 2.14407 ( -0.227616 0.285339 ) Norm@50keV : 4.47885E-02 ( -0.00127477 0.00138564 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 40.90 using 59 bins. Reduced chi-squared = 0.730357 # Null hypothesis probability of 9.35e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 79.9 sec: 5.74747 ( -0.09918 0.09412 ) ph/cm2/s Energy fluence (15-150 keV) : 2.52567e-05 ( 5.97829e-07 1.31667e-06 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 39.068 sec. to 40.068 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.57013 ( -0.0333844 0.0333602 ) Norm@50keV : 0.378868 ( -0.00692479 0.00692421 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 66.67 using 59 bins. Reduced chi-squared = 1.16965 # Null hypothesis probability of 1.79e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 48.2481 ( -1.0301 1.0337 ) ph/cm2/s Energy fluence (15-150 keV) : 3.5573e-06 ( -6.58968e-08 6.58807e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 39.068 sec. to 40.068 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.16083 ( -0.141556 0.145793 ) Epeak [keV] : 118.838 ( -16.6929 31.8713 ) Norm@50keV : 0.571228 ( -0.0739117 0.0875055 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 41.14 using 59 bins. Reduced chi-squared = 0.734643 # Null hypothesis probability of 9.32e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 40.1725 ( ) ph/cm2/s Energy fluence (15-150 keV) : 3.48803e-06 ( -7.0361e-08 7.0249e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 47.304 sec. Hardness ratio (energy fluence ratio) = 0.854495646914
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.5723144e-05 S(50-150 keV) = 1.1042384e-05
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 = -2.113739400886126E-02, IMY = 1.695209670042056E-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: -131.747400 -0.836000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 264.6540 -44.4770 8.0 58.1 -155.0 1.8865 1.4 4.1 4U 1735-44 43.5550 -53.7432 2.8 20.5 58.5 1.1511 4.2 ------ UNKNOWN 35.5785 -16.9667 2.3 47.6 7.9 2.2247 5.0 ------ UNKNOWN 11.6989 -72.0923 2.6 12.3 143.3 0.9937 4.5 ------ UNKNOWN 272.8816 -45.5253 2.8 53.7 -150.1 3.3416 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.836000 79.064000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 264.8493 -44.3875 5.5 58.1 -154.8 -7.4494 -2.1 5.9 4U 1735-44 48.2331 -47.3669 3.1 26.8 50.4 3.1996 3.8 ------ UNKNOWN 41.1628 -15.9783 2.4 50.4 14.1 11.1986 4.9 ------ UNKNOWN 231.9383 -68.1005 2.6 47.9 170.6 6.3859 4.5 ------ UNKNOWN 35.8964 -21.1992 3.1 43.7 10.2 4.8451 3.8 ------ UNKNOWN 351.4653 -55.1233 0.1 9.7 -97.1 54.6128 86.8 ------ UNKNOWN 258.1025 -56.6219 2.7 50.7 -167.9 5.9669 4.3 ------ UNKNOWN 6.5327 -33.3440 2.3 26.6 -31.4 3.4573 5.1 ------ UNKNOWN 350.6475 -25.1884 2.7 36.6 -55.7 4.4428 4.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: