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 15:03:23 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1246907
======================================================================
Trigger: 01246907 Segment: 000
BAT Trigger Time: 744516176.576 [s; MET]
Trigger Stop: 744516177.6 [s; MET]
UTC: 2024-08-05T02:02:22.641800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 190.91086426608 Dec: -53.6216831669858 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.95
Image Trigger?: NO
Rate S/N Ratio: 73.4642770331268 [ if not an image trigger ]
Image S/N Ratio: 18.95
Analysis Position: [ source = BAT ]
RA: 190.91086426608 Dec: -53.6216831669858 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 190.920216420598 Dec: -53.6019269889522 [deg; J2000]
{ 12h 43m 40.9s , -53d 36' 06.9" }
+/- 0.783527690103281 [arcmin] (estimated 90% radius based on SNR)
+/- 0.210640894738561 [arcmin] (formal 1-sigma fit error)
SNR: 43.099210003768
Angular difference between the analysis and refined position is 1.231227 arcmin
Partial Coding Fraction: 0.3164062 [ including projection effects ]
Duration
T90: 40.2439999580383 +/- 6.71502342177856
Measured from: -1.32400000095367
to: 38.9199999570847 [s; relative to TRIGTIME]
T50: 6.92399990558624 +/- 0.619225337973124
Measured from: 1.42400002479553
to: 8.34799993038177 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.28400003910065
to: 4.28400003910065 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.36000001430511
to: 254.152000069618 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.797235 4.162310 4.210288 1.457753
0.124784 0.131597 0.119724 0.100592 [error]
Peak 0.149837 0.333868 0.419570 0.153352
0.016803 0.020619 0.022528 0.016825 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 256.512 -2.360 254.152
T90 40.244 -1.324 38.920
T50 6.924 1.424 8.348
Peak 1.000 3.284 4.284
====== 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 -1.205 -0.062 0.062 - - - 3.32e-03 -1.11e-04 1.11e-04 57.680 57
CPL -1.211 -0.056 0.079 9999.360 -9999.360 -9999.360 3.29e-03 -7.29e-05 8.36e-04 58.130 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 -0.796 -0.103 0.106 - - - 6.92e-02 -4.46e-03 4.43e-03 54.850 57
CPL -0.269 -0.423 0.469 201.344 -66.375 489.098 1.15e-01 -3.79e-02 6.20e-02 50.230 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 8.24e-07 1.81e-06 3.15e-06 1.27e-05 8.62e-06 1.85e-05 erg/cm2
90%_error_low -5.84e-08 -7.58e-08 -1.17e-07 -1.09e-06 -2.99e-07 -1.14e-06 erg/cm2
90%_error_hi 6.01e-08 7.54e-08 1.17e-07 1.16e-06 2.99e-07 1.20e-06 erg/cm2
Peak flux PL 6.88e-04 8.57e-03 8.59e-02 8.44e+00 3.86e-01 8.52e+00 ph/cm2/s
90%_error_low -3.77e-05 -5.10e-04 5.19e-03 -5.20e-01 2.78e-02 -5.01e-01 ph/cm2/s
90%_error_hi 1.47e-04 1.54e-03 2.67e-02 9.35e-01 1.17e-01 9.79e-01 ph/cm2/s
Fluence CPL 8.24e-07 1.81e-06 3.14e-06 1.28e-05 8.62e-06 1.84e-05 erg/cm2
90%_error_low -4.06e-08 -6.90e-08 -1.17e-07 -3.44e-06 -3.17e-07 -3.11e-06 erg/cm2
90%_error_hi 5.95e-08 7.51e-08 1.31e-07 1.88e-06 2.60e-07 6.27e-07 erg/cm2
Peak flux CPL 1.25e+00 2.28e+00 2.77e+00 3.60e+00 7.86e+00 9.90e+00 ph/cm2/s
90%_error_low -2.39e-01 -1.99e-01 -2.21e-01 -1.04e+00 -5.08e-01 -1.15e+00 ph/cm2/s
90%_error_hi 2.52e-01 1.99e-01 2.24e-01 1.60e+00 5.08e-01 1.62e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 190.9202 -53.6019 0.0045 33.5952 -88.2971 10.5326067 43.099 TRIG_01246907 Foreground time interval of the image: -2.360 13.125 (delta_t = 15.485 [sec]) Background time interval of the image: -239.576 -2.360 (delta_t = 237.216 [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 -2.360 sec. to 254.152 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.20471 ( -0.0620998 0.0624752 ) Norm@50keV : 3.31535E-03 ( -0.000110739 0.000110518 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 57.68 using 59 bins. Reduced chi-squared = 1.01193 # Null hypothesis probability of 4.50e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 256.5 sec: 0.389416 ( -0.014019 0.014078 ) ph/cm2/s Energy fluence (15-150 keV) : 8.61701e-06 ( -2.98853e-07 2.99341e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.360 sec. to 254.152 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.21109 ( -0.065591 0.0698211 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 3.29438E-03 ( -0.000109395 0.000799508 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 58.13 using 59 bins. Reduced chi-squared = 1.03804 # Null hypothesis probability of 3.97e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 256.5 sec: 0.389779 ( -0.016022 0.014311 ) ph/cm2/s Energy fluence (15-150 keV) : 8.62179e-06 ( -3.17403e-07 2.60145e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 3.284 sec. to 4.284 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.796065 ( -0.103183 0.105511 ) Norm@50keV : 6.92398E-02 ( -0.00445557 0.0044306 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 54.85 using 59 bins. Reduced chi-squared = 0.962281 # Null hypothesis probability of 5.56e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.385569 ( 0.027832 0.116535 ) ph/cm2/s Energy fluence (15-150 keV) : 8.1055e-07 ( -5.30197e-08 5.31442e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.284 sec. to 4.284 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.26947 ( -0.422733 0.469069 ) Epeak [keV] : 201.344 ( -66.3747 489.098 ) Norm@50keV : 0.115221 ( -0.0379208 0.0620249 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 50.23 using 59 bins. Reduced chi-squared = 0.896964 # Null hypothesis probability of 6.92e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 7.85617 ( -0.5079 0.50842 ) ph/cm2/s Energy fluence (15-150 keV) : 8.01475e-07 ( -5.47856e-08 5.45964e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 40.244 sec. Hardness ratio (energy fluence ratio) = 1.73548247042
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.6389424e-06 S(50-150 keV) = 5.978079e-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 = 1.973969035050268E-02, IMY = 6.639847191198863E-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: -239.576000 -2.360000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.2541 -60.4894 42.9 38.9 -108.7 0.2773 0.3 8.2 Cen X-3 186.4565 -62.6458 10.8 31.1 -105.2 0.5604 1.1 9.3 GX 301-2 244.9819 -15.6364 0.7 44.0 8.7 9.8783 15.6 0.3 Sco X-1 256.2312 -37.9292 0.0 21.4 26.8 0.2552 0.6 12.7 4U 1700-377 256.3869 -36.4942 8.6 22.8 26.8 0.5768 1.3 4.9 GX 349+2 262.9807 -24.7764 9.7 35.1 35.8 0.9260 1.2 2.4 GX 1+4 264.7266 -44.4711 3.6 16.3 50.8 1.3513 3.2 1.4 4U 1735-44 270.2747 -25.1488 8.1 36.1 47.0 1.2697 1.4 4.2 GX 5-1 270.3112 -25.7183 5.1 35.6 47.3 -1.9580 -2.3 1.6 GRS 1758-258 275.9652 -30.1879 0.0 32.9 58.3 -1.3043 -1.5 10.9 H1820-303 285.1214 -25.0098 53.4 40.8 67.3 0.4220 0.2 7.1 HT1900.1-2455 263.1055 -33.7777 7.7 26.3 39.1 0.7511 1.5 6.7 GX 354-0 286.4843 -35.4261 3.6 32.2 77.4 2.6336 3.2 ------ UNKNOWN 22.7029 -67.0862 2.4 48.4 176.4 5.0830 4.8 ------ UNKNOWN 237.5743 -68.5115 3.0 11.5 -130.3 1.3571 3.9 ------ UNKNOWN 216.3744 -21.8335 2.8 45.6 -31.0 2.6653 4.1 ------ UNKNOWN 196.8363 -43.3436 2.7 37.2 -70.4 3.5262 4.4 ------ UNKNOWN 197.9702 -31.6087 3.3 45.6 -57.8 6.3762 3.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -2.360000 13.124600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.3536 -60.4176 0.0 38.9 -108.6 -0.7655 -2.3 12.4 Cen X-3 186.6820 -62.6752 38.6 31.0 -105.2 0.0607 0.3 5.7 GX 301-2 244.9076 -15.7805 166.6 43.8 8.6 -0.0112 -0.1 9.4 Sco X-1 256.1454 -37.9549 9.7 21.3 26.6 0.1265 1.2 10.0 4U 1700-377 256.2738 -36.4769 13.5 22.8 26.6 -0.0880 -0.8 8.4 GX 349+2 262.7858 -24.6741 0.0 35.2 35.4 0.0317 0.2 12.9 GX 1+4 264.8684 -44.3116 4.2 16.5 50.9 0.2700 2.8 9.9 4U 1735-44 270.3484 -25.0615 43.5 36.2 47.1 -0.0426 -0.3 3.6 GX 5-1 270.3137 -25.7769 17.3 35.5 47.3 -0.1014 -0.7 2.1 GRS 1758-258 275.7774 -30.4087 4.0 32.6 58.1 0.4451 2.9 8.0 H1820-303 284.9731 -24.8140 9.5 40.9 67.0 -0.3726 -1.2 7.3 HT1900.1-2455 263.1254 -33.8236 5.5 26.2 39.1 -0.2275 -2.1 6.8 GX 354-0 276.5717 -19.1501 3.0 43.5 53.2 1.2011 3.8 ------ UNKNOWN 230.8707 -4.4685 3.3 57.4 -6.6 1.8915 3.5 ------ UNKNOWN 52.0462 -66.6723 2.4 53.2 -170.2 1.5505 4.7 ------ UNKNOWN 155.8858 -75.4392 2.8 35.4 -134.4 0.7387 4.0 ------ UNKNOWN 220.2753 -8.0576 2.2 56.9 -19.8 2.5798 5.1 ------ UNKNOWN 190.9202 -53.6019 0.3 33.6 -88.3 10.5323 43.1 ------ UNKNOWN 182.6685 -54.0229 2.5 37.3 -93.8 1.5371 4.6 ------ UNKNOWN 103.2452 -64.6210 2.8 54.1 -144.5 2.6655 4.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 84.924600 179.124600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.6369 -40.4794 28.9 38.8 -131.0 0.1218 0.4 6.7 Vela X-1 170.0869 -60.5657 3.9 13.2 -167.7 0.5245 3.0 7.6 Cen X-3 186.5139 -62.9119 5.2 9.6 154.5 0.3447 2.2 9.4 GX 301-2 250.4109 -62.9263 3.0 31.4 93.5 1.3314 3.8 ------ UNKNOWN 188.8533 -55.2265 2.6 2.0 178.0 0.6767 4.5 ------ UNKNOWN 197.1799 3.0891 2.3 56.9 -30.2 4.5002 5.1 ------ UNKNOWN 151.3150 -24.7324 2.5 41.2 -99.1 3.3021 4.5 ------ UNKNOWN