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 15:08:56 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1243868
======================================================================
Trigger: 01243868 Segment: 000
BAT Trigger Time: 743127925.12 [s; MET]
Trigger Stop: 743127926.144 [s; MET]
UTC: 2024-07-20T00:24:51.280960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 96.7003376506726 Dec: 30.341801542182 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.44
Image Trigger?: NO
Rate S/N Ratio: 42.7784992724149 [ if not an image trigger ]
Image S/N Ratio: 11.44
Analysis Position: [ source = BAT ]
RA: 96.7003376506726 Dec: 30.341801542182 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 96.7212681456265 Dec: 30.2983272931622 [deg; J2000]
{ 06h 26m 53.1s , +30d 17' 54.0" }
+/- 2.77813048284198 [arcmin] (estimated 90% radius based on SNR)
+/- 1.31120251710562 [arcmin] (formal 1-sigma fit error)
SNR: 7.06620182279653
Angular difference between the analysis and refined position is 2.824750 arcmin
Partial Coding Fraction: 0.578125 [ including projection effects ]
Duration
T90: 183.475999951363 +/- 71.4742999976275
Measured from: 0.111999988555908
to: 183.587999939919 [s; relative to TRIGTIME]
T50: 82.4679999351501 +/- 38.5907505309544
Measured from: 1.67599999904633
to: 84.1439999341965 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.439999938011169
to: 1.43999993801117 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.116000056266785
to: 193.891999959946 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.807708 1.031641 0.832938 0.316659
0.114737 0.117119 0.099819 0.085187 [error]
Peak 0.062113 0.105769 0.124533 0.047205
0.009619 0.011121 0.011392 0.009624 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 194.008 -0.116 193.892
T90 183.476 0.112 183.588
T50 82.468 1.676 84.144
Peak 1.000 0.440 1.440
====== 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 -1.490 -0.216 0.214 - - - 9.74e-04 -1.17e-04 1.16e-04 52.750 57
CPL -1.464 -1.616 0.705 996.490 -996.490 -996.490 1.01e-03 -1.46e-04 8.55e-05 52.780 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 -0.943 -0.180 0.184 - - - 2.22e-02 -2.26e-03 2.26e-03 42.080 57
CPL -0.813 -0.297 0.659 528.675 -528.675 -528.675 2.54e-02 -5.27e-03 2.25e-02 42.100 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 2.39e-07 4.42e-07 6.30e-07 1.89e-06 1.80e-06 3.20e-06 erg/cm2
90%_error_low -4.82e-08 -5.49e-08 -9.95e-08 -5.78e-07 -2.36e-07 -6.64e-07 erg/cm2
90%_error_hi 5.09e-08 5.43e-08 9.84e-08 7.32e-07 2.39e-07 7.89e-07 erg/cm2
Peak flux PL 5.37e-01 7.54e-01 7.85e-01 1.50e+00 2.55e+00 3.58e+00 ph/cm2/s
90%_error_low -1.10e-01 -9.68e-02 -8.80e-02 -3.41e-01 -2.62e-01 -4.10e-01 ph/cm2/s
90%_error_hi 1.18e-01 9.52e-02 8.70e-02 4.02e-01 2.62e-01 4.30e-01 ph/cm2/s
Fluence CPL 2.40e-07 4.40e-07 6.25e-07 1.94e-06 1.80e-06 3.19e-06 erg/cm2
90%_error_low -5.05e-08 -5.45e-08 -1.17e-07 -1.28e-06 -2.55e-07 -1.23e-06 erg/cm2
90%_error_hi 5.07e-08 5.74e-08 1.24e-07 2.53e-08 2.40e-07 3.87e-07 erg/cm2
Peak flux CPL 5.41e-01 7.56e-01 7.89e-01 1.48e+00 2.55e+00 3.55e+00 ph/cm2/s
90%_error_low -1.52e-01 -9.77e-02 -9.24e-02 -7.75e-01 -2.73e-01 -8.30e-01 ph/cm2/s
90%_error_hi 8.55e-02 1.04e-01 1.13e-01 2.43e-01 2.67e-01 4.17e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 96.7213 30.2983 0.0271 26.1626 -73.5963 2.0876672 7.066 TRIG_01243868 Foreground time interval of the image: -0.116 193.892 (delta_t = 194.008 [sec]) Background time interval of the image: -239.120 -0.116 (delta_t = 239.004 [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 -0.116 sec. to 193.892 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.48959 ( -0.216105 0.213604 ) Norm@50keV : 9.74235E-04 ( -0.000116863 0.000116016 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 52.75 using 59 bins. Reduced chi-squared = 0.925439 # Null hypothesis probability of 6.35e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 194 sec: 0.121288 ( -0.014493 0.014534 ) ph/cm2/s Energy fluence (15-150 keV) : 1.79627e-06 ( -2.36426e-07 2.38998e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.116 sec. to 193.892 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.487 ( -1.61558 0.705327 ) Epeak [keV] : 1.00000E+04 ( -10000 -10000 ) Norm@50keV : 9.77208E-04 ( -0.000117573 0.0001135 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 52.76 using 59 bins. Reduced chi-squared = 0.942143 # Null hypothesis probability of 5.98e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 194 sec: 0.121913 ( -0.017444 0.016209 ) ph/cm2/s Energy fluence (15-150 keV) : 1.80058e-06 ( -2.55246e-07 2.40182e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.440 sec. to 1.440 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.942988 ( -0.18019 0.18415 ) Norm@50keV : 2.22031E-02 ( -0.00226355 0.00225733 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 42.08 using 59 bins. Reduced chi-squared = 0.738246 # Null hypothesis probability of 9.30e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 2.55038 ( -0.26165 0.26205 ) ph/cm2/s Energy fluence (15-150 keV) : 2.45155e-07 ( -2.77047e-08 2.78811e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.440 sec. to 1.440 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.936757 ( -0.289798 0.666441 ) Epeak [keV] : 9996.30 ( -9995.79 -9995.79 ) Norm@50keV : 2.23449E-02 ( -0.00225083 0.025535 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 42.07 using 59 bins. Reduced chi-squared = 0.75125 # Null hypothesis probability of 9.16e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 2.54688 ( -0.27273 0.26708 ) ph/cm2/s Energy fluence (15-150 keV) : 2.4481e-07 ( -2.92888e-08 2.75228e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 183.476 sec. Hardness ratio (energy fluence ratio) = 1.42449183046
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 6.809499e-07 S(50-150 keV) = 1.1153491e-06
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 = 1.387310552712313E-01, IMY = 4.712554378230551E-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: -239.120000 -0.116000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6226 22.0146 0.4 22.4 -39.4 9.8636 27.1 0.6 Crab 4.9384 46.7010 2.0 44.7 127.2 11.2072 5.8 ------ UNKNOWN 107.4801 37.9651 2.3 31.8 -95.0 2.8542 5.1 ------ UNKNOWN 116.2988 31.5204 2.4 40.8 -89.0 7.3680 4.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.116000 193.892000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.7919 22.0526 10.6 22.4 -39.8 -0.2556 -1.1 9.1 Crab 348.2227 60.9309 2.8 51.2 148.7 5.1242 4.1 ------ UNKNOWN 96.7213 30.2983 1.6 26.2 -73.6 2.0882 7.1 ------ UNKNOWN 101.0081 7.5046 2.3 44.1 -47.4 2.7090 5.0 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: -239.120000 963.015400 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 83.6209 22.0172 0.4 22.4 -39.4 48.8470 30.9 0.7 Crab 4.9337 46.6900 2.2 44.7 127.2 48.2188 5.4 ------ UNKNOWN 33.3277 23.4512 3.7 32.1 77.3 10.8705 3.1 ------ UNKNOWN 31.4100 26.9747 2.9 31.6 84.7 13.3715 3.9 ------ UNKNOWN 48.7452 24.9014 2.9 20.6 58.4 7.1615 3.9 ------ UNKNOWN 97.7173 -8.0105 2.3 55.2 -32.3 48.4941 5.0 ------ UNKNOWN 116.2923 31.4980 2.1 40.8 -88.9 38.0165 5.5 ------ UNKNOWN