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 14:39:39 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1258721
======================================================================
Trigger: 01258721 Segment: 000
BAT Trigger Time: 749944352.576 [s; MET]
Trigger Stop: 749944368.96 [s; MET]
UTC: 2024-10-06T21:51:58.270480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 304.794264846893 Dec: -40.7959833433653 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.04
Image Trigger?: NO
Rate S/N Ratio: 13.4164078649987 [ if not an image trigger ]
Image S/N Ratio: 11.04
Analysis Position: [ source = BAT ]
RA: 304.794264846893 Dec: -40.7959833433653 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 304.779440948922 Dec: -40.8048025689423 [deg; J2000]
{ 20h 19m 07.1s , -40d 48' 17.3" }
+/- 1.83014622512171 [arcmin] (estimated 90% radius based on SNR)
+/- 0.809986013260305 [arcmin] (formal 1-sigma fit error)
SNR: 12.8274012331915
Angular difference between the analysis and refined position is 0.856345 arcmin
Partial Coding Fraction: 0.65625 [ including projection effects ]
Duration
T90: 47 +/- 9.8488578017961
Measured from: -3.57599997520447
to: 43.4240000247955 [s; relative to TRIGTIME]
T50: 17 +/- 7.61577310586391
Measured from: 4.42400002479553
to: 21.4240000247955 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 10.4240000247955
to: 11.4240000247955 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.57599997520447
to: 48.4240000247955 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.422882 0.573738 0.456489 0.094926
0.063055 0.063920 0.055335 0.046758 [error]
Peak 0.019076 0.033578 0.023707 -0.008236
0.008563 0.008577 0.007505 0.006257 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 54.000 -5.576 48.424
T90 47.000 -3.576 43.424
T50 17.000 4.424 21.424
Peak 1.000 10.424 11.424
====== 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 -1.537 -0.200 0.197 - - - 1.93e-03 -2.37e-04 2.35e-04 67.930 57
CPL -0.725 -0.818 1.009 74.162 -20.189 925.767 5.18e-03 -3.22e-03 1.22e-02 65.060 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 -1.455 -0.493 0.476 - - - 5.31e-03 -1.67e-03 1.65e-03 55.770 57
CPL 1.212 -2.440 6.225 62.235 -16.409 101.303 1.02e-01 -1.02e-01 9.75e+01 52.150 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 1.38e-07 2.47e-07 3.41e-07 9.76e-07 9.82e-07 1.70e-06 erg/cm2
90%_error_low -2.54e-08 -2.97e-08 -5.42e-08 -2.88e-07 -1.30e-07 -3.41e-07 erg/cm2
90%_error_hi 2.65e-08 2.96e-08 5.42e-08 3.60e-07 1.32e-07 3.99e-07 erg/cm2
Peak flux PL 2.09e-01 2.16e-01 1.58e-01 1.85e-01 6.55e-01 7.69e-01 ph/cm2/s
90%_error_low -9.43e-02 -7.05e-02 -5.89e-02 -1.07e-01 -2.03e-01 -2.35e-01 ph/cm2/s
90%_error_hi 1.09e-01 6.98e-02 5.88e-02 1.64e-01 2.04e-01 2.42e-01 ph/cm2/s
Fluence CPL 1.23e-07 2.71e-07 3.50e-07 3.12e-07 9.15e-07 1.06e-06 erg/cm2
90%_error_low -2.98e-08 -3.82e-08 -6.14e-08 -2.02e-07 -1.44e-07 -2.50e-07 erg/cm2
90%_error_hi 3.03e-08 3.99e-08 6.10e-08 6.70e-07 1.48e-07 6.68e-07 erg/cm2
Peak flux CPL 1.18e-01 2.56e-01 1.92e-01 3.26e-02 5.95e-01 5.99e-01 ph/cm2/s
90%_error_low -1.18e-01 -9.40e-02 -7.86e-02 -3.26e-02 -2.07e-01 -2.11e-01 ph/cm2/s
90%_error_hi 1.34e-01 9.61e-02 7.92e-02 1.29e-01 2.12e-01 2.29e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 304.7794 -40.8048 0.0150 24.5510 49.5344 1.6233681 12.827 TRIG_01258721 Foreground time interval of the image: -5.576 48.424 (delta_t = 54.000 [sec]) Background time interval of the image: -239.576 -5.576 (delta_t = 234.000 [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 -5.576 sec. to 48.424 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.53708 ( -0.199934 0.197038 ) Norm@50keV : 1.92829E-03 ( -0.000236609 0.000234608 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 67.93 using 59 bins. Reduced chi-squared = 1.19175 # Null hypothesis probability of 1.52e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 54 sec: 0.243214 ( -0.028706 0.028738 ) ph/cm2/s Energy fluence (15-150 keV) : 9.82233e-07 ( -1.30401e-07 1.32225e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.576 sec. to 48.424 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.724808 ( -0.817926 1.00882 ) Epeak [keV] : 74.1618 ( -20.1884 925.768 ) Norm@50keV : 5.18183E-03 ( -0.00321946 0.0121787 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 65.06 using 59 bins. Reduced chi-squared = 1.16179 # Null hypothesis probability of 1.90e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 54 sec: 0.235508 ( -0.029817 0.029799 ) ph/cm2/s Energy fluence (15-150 keV) : 9.15489e-07 ( -1.43549e-07 1.47977e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 10.424 sec. to 11.424 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.45495 ( -0.493629 0.475114 ) Norm@50keV : 5.31255E-03 ( -0.00166566 0.00165189 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 55.77 using 59 bins. Reduced chi-squared = 0.978421 # Null hypothesis probability of 5.21e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.655465 ( -0.202649 0.203656 ) ph/cm2/s Energy fluence (15-150 keV) : 5.08089e-08 ( -1.69268e-08 1.74344e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.424 sec. to 11.424 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.21245 ( -2.44529 6.21936 ) Epeak [keV] : 62.2346 ( -16.3922 101.32 ) Norm@50keV : 0.102084 ( -0.102747 97.5164 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 52.15 using 59 bins. Reduced chi-squared = 0.93125 # Null hypothesis probability of 6.21e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.595144 ( -0.207177 0.211675 ) ph/cm2/s Energy fluence (15-150 keV) : 4.51825e-08 ( -1.62584e-08 1.78566e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 47.0 sec. Hardness ratio (energy fluence ratio) = 1.37835147217
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.849769e-07 S(50-150 keV) = 5.972714e-07
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 = 2.964608070197683E-01, IMY = -3.475327571423499E-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 -5.576000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.3630 -60.5860 2.9 47.8 -141.6 4.8656 4.0 2.6 Cen X-3 186.4468 -62.8789 4.3 40.8 -136.2 2.2730 2.7 8.7 GX 301-2 255.8292 -37.9091 4.2 26.9 -45.9 1.4040 2.8 8.4 4U 1700-377 256.5098 -36.3616 4.1 28.0 -43.4 1.4356 2.8 5.1 GX 349+2 263.1889 -24.6486 7.6 37.2 -26.0 0.9559 1.5 11.4 GX 1+4 264.6508 -44.5007 24.7 18.0 -37.9 0.2121 0.5 5.0 4U 1735-44 268.4445 -1.4074 13.6 59.3 -13.7 -1.4416 -0.8 5.3 SW J1753.5-0127 270.3370 -25.0436 4.8 35.6 -15.4 1.3332 2.4 3.6 GX 5-1 270.2104 -25.6650 5.3 35.0 -15.8 1.2113 2.2 6.8 GRS 1758-258 273.8954 -14.1825 3.1 46.0 -8.5 2.7532 3.7 10.9 GX 17+2 275.8699 -30.4377 16.9 29.7 -7.5 0.3449 0.7 5.1 H1820-303 285.1004 -24.8919 7.8 35.3 7.8 -0.8993 -1.5 3.9 HT1900.1-2455 262.7772 -33.9459 43.9 28.4 -31.4 -0.1343 -0.3 12.5 GX 354-0 325.0609 -42.5640 2.6 32.2 77.6 4.2921 4.5 ------ UNKNOWN 294.8601 -22.9468 2.4 38.5 22.1 3.4933 4.8 ------ UNKNOWN 91.7297 -64.1446 2.0 55.7 175.4 8.5242 5.7 ------ UNKNOWN 276.7153 -21.4308 4.2 38.6 -5.2 1.6840 2.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -5.576000 48.424000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.7089 -60.5029 0.0 47.8 -141.4 -0.4049 -1.4 13.6 Cen X-3 186.6003 -62.7057 3.4 40.9 -135.9 0.6949 3.4 4.2 GX 301-2 256.2289 -37.7498 0.0 26.9 -45.1 0.0154 0.1 12.8 4U 1700-377 256.2069 -36.5012 3.7 28.0 -44.0 0.3830 3.1 12.0 GX 349+2 262.9521 -24.5930 2.3 37.3 -26.3 -0.7200 -4.9 9.7 GX 1+4 264.8526 -44.3928 3.5 18.1 -37.3 0.3827 3.3 5.8 4U 1735-44 268.4089 -1.4010 43.7 59.3 -13.8 0.2040 0.3 3.9 SW J1753.5-0127 270.2134 -25.1854 6.8 35.5 -15.6 0.2266 1.7 7.4 GX 5-1 270.4712 -25.6062 0.0 35.0 -15.3 0.1873 1.5 12.3 GRS 1758-258 273.9432 -14.1838 10.5 46.0 -8.4 -0.2021 -1.1 9.6 GX 17+2 275.7600 -30.5110 0.0 29.6 -7.7 -0.1539 -1.3 12.1 H1820-303 285.1490 -24.9895 4.4 35.2 7.9 0.3679 2.6 7.4 HT1900.1-2455 262.8775 -33.9660 7.0 28.3 -31.2 -0.1982 -1.6 9.6 GX 354-0 329.5701 -35.4734 2.4 39.9 74.7 2.0549 4.8 ------ UNKNOWN 304.7794 -40.8048 0.9 24.6 49.5 1.6236 12.8 ------ UNKNOWN 11.3935 -77.8240 2.4 32.5 156.6 0.7059 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 133.124600 715.224590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 255.8820 -37.9493 88.7 37.4 -83.1 0.2789 0.1 8.0 4U 1700-377 256.2892 -36.2810 0.0 37.7 -80.3 2.4687 1.2 11.1 GX 349+2 262.8704 -24.8379 6.8 38.2 -59.5 2.7729 1.7 9.4 GX 1+4 264.5629 -44.2974 0.0 29.5 -91.4 -2.9410 -2.5 12.0 4U 1735-44 268.3941 -1.4115 4.9 51.3 -30.5 -5.3628 -2.4 2.9 SW J1753.5-0127 270.1848 -25.2218 6.4 32.6 -53.3 1.9385 1.8 10.1 GX 5-1 270.4309 -25.8704 6.9 32.1 -54.0 1.7537 1.7 10.3 GRS 1758-258 274.1408 -14.0075 5.6 37.8 -34.8 2.3829 2.1 8.0 GX 17+2 275.9271 -30.3727 170.7 25.5 -56.1 0.0644 0.1 0.4 H1820-303 284.8652 -24.7995 0.0 23.0 -33.2 -1.2518 -1.4 11.8 HT1900.1-2455 288.8820 10.9225 4.5 53.8 -0.5 4.4374 2.6 5.1 GRS 1915+105 262.7850 -33.9478 318.7 33.7 -73.1 0.0540 0.0 12.2 GX 354-0 349.3363 -23.6960 1.9 40.8 98.2 12.7558 5.9 ------ UNKNOWN 333.7551 -20.0446 2.7 32.2 77.6 7.3870 4.3 ------ UNKNOWN 328.5878 -19.2106 3.1 29.6 69.4 5.4628 3.7 ------ UNKNOWN 297.4153 -31.6355 2.9 10.9 -16.3 3.2186 4.1 ------ UNKNOWN