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: Fri Nov 15 20:04:07 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1252402
======================================================================
Trigger: 01252402 Segment: 000
BAT Trigger Time: 747158693.44 [s; MET]
Trigger Stop: 747158701.632 [s; MET]
UTC: 2024-09-04T16:04:19.325020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 136.440024834508 Dec: -30.5064390558512 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.2
Image Trigger?: NO
Rate S/N Ratio: 14.422205101856 [ if not an image trigger ]
Image S/N Ratio: 10.2
Analysis Position: [ source = BAT ]
RA: 136.440024834508 Dec: -30.5064390558512 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 136.442157655978 Dec: -30.5193145759863 [deg; J2000]
{ 09h 05m 46.1s , -30d 31' 09.5" }
+/- 1.78255674723266 [arcmin] (estimated 90% radius based on SNR)
+/- 0.951455401976796 [arcmin] (formal 1-sigma fit error)
SNR: 13.3194104488996
Angular difference between the analysis and refined position is 0.780358 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 126.287999868393 +/- 11.5302941611068
Measured from: -54.8400000333786
to: 71.4479998350143 [s; relative to TRIGTIME]
T50: 59.0119999647141 +/- 12.4370828277889
Measured from: -7.89200007915497
to: 51.1199998855591 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 69.7119998931885
to: 70.7119998931885 [s; relative to TRIGTIME]
Total Fluence
Measured from: -68.6680001020432
to: 81.4759999513626 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.065638 1.282393 0.781974 0.075582
0.071404 0.072959 0.061242 0.051277 [error]
Peak 0.032789 0.041085 0.026805 0.001770
0.006431 0.006411 0.005468 0.004374 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 150.144 -68.668 81.476
T90 126.288 -54.840 71.448
T50 59.012 -7.892 51.120
Peak 1.000 69.712 70.712
====== 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 -1.750 -0.123 0.121 - - - 1.31e-03 -9.68e-05 9.58e-05 47.400 57
CPL -1.238 -0.472 0.529 68.706 -16.046 184.036 2.46e-03 -1.06e-03 2.21e-03 43.910 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 -1.804 -0.318 0.296 - - - 5.96e-03 -1.25e-03 1.22e-03 61.140 57
CPL -0.935 -1.131 1.542 53.670 -20.326 -53.670 1.84e-02 -1.84e-02 1.21e-01 59.520 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 3.17e-07 5.00e-07 5.95e-07 1.38e-06 1.81e-06 2.79e-06 erg/cm2
90%_error_low -3.31e-08 -3.35e-08 -5.96e-08 -2.65e-07 -1.38e-07 -3.24e-07 erg/cm2
90%_error_hi 3.40e-08 3.35e-08 5.98e-08 3.06e-07 1.40e-07 3.55e-07 erg/cm2
Peak flux PL 3.29e-01 2.77e-01 1.58e-01 1.35e-01 8.23e-01 8.98e-01 ph/cm2/s
90%_error_low -8.19e-02 -4.89e-02 -4.22e-02 -5.83e-02 -1.46e-01 -1.62e-01 ph/cm2/s
90%_error_hi 8.57e-02 4.89e-02 4.26e-02 7.95e-02 1.46e-01 1.63e-01 ph/cm2/s
Fluence CPL 2.96e-07 5.29e-07 5.99e-07 6.23e-07 1.73e-06 2.05e-06 erg/cm2
90%_error_low -3.85e-08 -4.23e-08 -6.45e-08 -3.02e-07 -1.56e-07 -3.44e-07 erg/cm2
90%_error_hi 3.89e-08 4.33e-08 6.44e-08 6.57e-07 1.59e-07 6.64e-07 erg/cm2
Peak flux CPL 3.00e-01 3.07e-01 1.61e-01 4.89e-02 8.04e-01 8.17e-01 ph/cm2/s
90%_error_low -9.39e-02 -6.32e-02 -5.05e-02 -4.89e-02 -1.48e-01 -8.22e-02 ph/cm2/s
90%_error_hi 9.50e-02 6.73e-02 4.87e-02 1.14e-01 1.48e-01 1.84e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 136.4422 -30.5193 0.0145 15.8259 -155.1310 2.7254480 13.319 TRIG_01252402 Foreground time interval of the image: -68.668 68.461 (delta_t = 137.129 [sec]) Background time interval of the image: -144.139 -68.668 (delta_t = 75.471 [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 -68.668 sec. to 81.476 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.74982 ( -0.12297 0.120571 ) Norm@50keV : 1.30715E-03 ( -9.68157e-05 9.58471e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 47.40 using 59 bins. Reduced chi-squared = 0.831579 # Null hypothesis probability of 8.14e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 150.1 sec: 0.176745 ( -0.011931 0.011943 ) ph/cm2/s Energy fluence (15-150 keV) : 1.81072e-06 ( -1.38468e-07 1.39985e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -68.668 sec. to 81.476 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.23751 ( -0.471513 0.529047 ) Epeak [keV] : 68.7060 ( -16.046 184.036 ) Norm@50keV : 2.45880E-03 ( -0.00106232 0.00221282 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 43.91 using 59 bins. Reduced chi-squared = 0.784107 # Null hypothesis probability of 8.79e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 150.1 sec: 0.172377 ( -0.012565 0.012567 ) ph/cm2/s Energy fluence (15-150 keV) : 1.72651e-06 ( -1.56181e-07 1.58573e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 69.712 sec. to 70.712 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.80401 ( -0.318285 0.296355 ) Norm@50keV : 5.96061E-03 ( -0.00125434 0.00121751 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 61.14 using 59 bins. Reduced chi-squared = 1.07263 # Null hypothesis probability of 3.30e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.822682 ( -0.145652 0.145686 ) ph/cm2/s Energy fluence (15-150 keV) : 5.48744e-08 ( -1.14684e-08 1.17833e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 69.712 sec. to 70.712 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.934903 ( -1.13078 1.54214 ) Epeak [keV] : 53.6701 ( -20.3264 -53.6702 ) Norm@50keV : 1.83861E-02 ( -0.018386 0.121419 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 59.52 using 59 bins. Reduced chi-squared = 1.06286 # Null hypothesis probability of 3.49e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.803690 ( -0.147543 0.14775 ) ph/cm2/s Energy fluence (15-150 keV) : 5.11152e-08 ( -1.19031e-08 1.2717e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 126.288 sec. Hardness ratio (energy fluence ratio) = 1.18937810858
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 8.170191e-07 S(50-150 keV) = 9.937193e-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 = -2.571756397475418E-01, IMY = 1.192078325277653E-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: -144.139410 -68.668000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.5300 -40.5581 241.8 9.6 167.2 -0.0059 -0.0 0.2 Vela X-1 170.3146 -60.6210 45.9 21.8 33.0 -0.0371 -0.3 0.1 Cen X-3 186.4400 -62.6487 16.0 29.3 27.6 0.1170 0.7 9.4 GX 301-2 145.9167 -70.0332 3.1 26.5 64.9 0.6552 3.7 ------ UNKNOWN 135.9465 -60.9675 2.1 18.8 81.4 0.7745 5.5 ------ UNKNOWN 105.0047 1.0702 2.2 58.7 -169.2 4.1061 5.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -68.668000 68.460590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.7292 -40.4807 6.5 9.5 168.0 -0.3577 -1.8 10.2 Vela X-1 170.2278 -60.4744 14.3 21.6 32.8 -0.1949 -0.8 9.3 Cen X-3 186.6476 -62.7983 3.3 29.5 27.8 0.9059 3.5 1.7 GX 301-2 110.0946 -30.5567 2.2 32.4 164.2 1.2682 5.2 ------ UNKNOWN 125.8486 -33.3522 2.3 19.9 176.7 1.0087 5.0 ------ UNKNOWN 158.4624 -45.9435 2.5 7.9 -5.1 0.9344 4.6 ------ UNKNOWN 136.4421 -30.5193 0.9 15.8 -155.1 2.7261 13.3 ------ UNKNOWN 175.7025 -22.4204 2.1 31.2 -60.1 1.7588 5.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 149.860580 482.740000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.6624 -40.4448 4.6 41.4 -155.5 0.6962 2.5 9.0 Vela X-1 169.9481 -60.5193 8.8 17.3 167.8 -0.2305 -1.3 12.5 Cen X-3 186.8615 -62.8681 3.0 13.5 139.5 0.6584 3.8 8.1 GX 301-2 244.9378 -15.6316 5.0 53.1 12.7 1.3046 2.3 2.5 Sco X-1 256.0529 -37.7232 9.1 44.7 43.1 -0.5614 -1.3 7.9 4U 1700-377 256.5312 -36.4754 6.1 45.8 42.0 0.9055 1.9 5.6 GX 349+2 245.4811 -12.1677 3.0 56.2 10.6 3.6769 3.8 ------ UNKNOWN 125.6482 -46.4137 2.0 44.4 -168.7 1.4933 5.7 ------ UNKNOWN 177.2395 -24.5627 2.5 28.7 -89.6 1.1918 4.6 ------ UNKNOWN