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 Jun 20 16:41:09 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1293340
======================================================================
Trigger: 01293340 Segment: 000
BAT Trigger Time: 762971443.904 [s; MET]
Trigger Stop: 762971444.928 [s; MET]
UTC: 2025-03-06T16:30:08.708060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 354.730006688864 Dec: -47.9933965939604 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 22.45
Image Trigger?: NO
Rate S/N Ratio: 169.911741795557 [ if not an image trigger ]
Image S/N Ratio: 22.45
Analysis Position: [ source = BAT ]
RA: 354.730006688864 Dec: -47.9933965939604 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 354.723686410546 Dec: -47.997904147996 [deg; J2000]
{ 23h 38m 53.7s , -47d 59' 52.5" }
+/- 1.05766283910682 [arcmin] (estimated 90% radius based on SNR)
+/- 0.4018028334579 [arcmin] (formal 1-sigma fit error)
SNR: 28.0760883500723
Angular difference between the analysis and refined position is 0.370867 arcmin
Partial Coding Fraction: 0.1308594 [ including projection effects ]
Duration
T90: 11.3919998407364 +/- 2.43956721808354
Measured from: -0.351999998092651
to: 11.0399998426437 [s; relative to TRIGTIME]
T50: 4.03199994564056 +/- 0.202385803424389
Measured from: 0.543999910354614
to: 4.57599985599518 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.139999985694885
to: 1.13999998569489 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.50400006771088
to: 19.039999961853 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.593375 4.166283 4.351832 1.228617
0.107333 0.125078 0.120219 0.087399 [error]
Peak 0.684280 1.313726 1.633130 0.543210
0.040481 0.055536 0.062002 0.041693 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 20.544 -1.504 19.040
T90 11.392 -0.352 11.040
T50 4.032 0.544 4.576
Peak 1.000 0.140 1.140
====== 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: CPL)
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 -1.371 -0.055 0.055 - - - 4.53e-02 -1.45e-03 1.45e-03 78.100 57
CPL -0.881 -0.237 0.250 133.662 -26.240 68.168 7.42e-02 -1.54e-02 2.05e-02 65.070 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 -1.119 -0.068 0.069 - - - 3.07e-01 -1.32e-02 1.32e-02 66.530 57
CPL -0.412 -0.306 0.327 132.236 -24.265 54.976 6.30e-01 -1.64e-01 2.38e-01 49.780 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 1.05e-06 2.09e-06 3.24e-06 1.10e-05 9.04e-06 1.74e-05 erg/cm2
90%_error_low -6.57e-08 -7.99e-08 -1.18e-07 -8.61e-07 -2.99e-07 -9.29e-07 erg/cm2
90%_error_hi 6.73e-08 7.97e-08 1.17e-07 9.06e-07 2.99e-07 9.63e-07 erg/cm2
Peak flux PL 8.77e+00 1.11e+01 1.02e+01 1.65e+01 3.57e+01 4.65e+01 ph/cm2/s
90%_error_low -7.08e-01 -5.73e-01 -4.76e-01 -1.51e+00 -1.58e+00 -2.08e+00 ph/cm2/s
90%_error_hi 7.29e-01 5.70e-01 4.74e-01 1.60e+00 1.58e+00 2.09e+00 ph/cm2/s
Fluence CPL 9.25e-07 2.15e-06 3.43e-06 6.42e-06 8.91e-06 1.29e-05 erg/cm2
90%_error_low -8.54e-08 -8.71e-08 -1.49e-07 -1.35e-06 -3.10e-07 -1.36e-06 erg/cm2
90%_error_hi 8.77e-08 8.77e-08 1.50e-07 1.81e-06 3.10e-07 1.79e-06 erg/cm2
Peak flux CPL 7.29e+00 1.16e+01 1.13e+01 9.35e+00 3.51e+01 3.95e+01 ph/cm2/s
90%_error_low -8.93e-01 -6.37e-01 -6.54e-01 -1.88e+00 -1.60e+00 -2.48e+00 ph/cm2/s
90%_error_hi 9.22e-01 6.41e-01 6.62e-01 2.46e+00 1.60e+00 2.84e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 354.7237 -47.9979 0.0068 49.6157 -37.1660 13.1305290 28.076 TRIG_01293340 Foreground time interval of the image: -1.504 19.040 (delta_t = 20.544 [sec]) Background time interval of the image: -239.904 -1.504 (delta_t = 238.400 [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 -1.504 sec. to 19.040 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.37096 ( -0.054978 0.0550559 ) Norm@50keV : 4.52742E-02 ( -0.00145307 0.00145263 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 78.10 using 59 bins. Reduced chi-squared = 1.37018 # Null hypothesis probability of 3.33e-02 with 57 degrees of freedom Photon flux (15-150 keV) in 20.54 sec: 5.47840 ( -0.19299 0.19346 ) ph/cm2/s Energy fluence (15-150 keV) : 9.04171e-06 ( -2.99112e-07 2.99444e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.504 sec. to 19.040 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.880589 ( -0.237276 0.250096 ) Epeak [keV] : 133.662 ( -26.2399 68.1682 ) Norm@50keV : 7.42107E-02 ( -0.0154282 0.0205461 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 65.07 using 59 bins. Reduced chi-squared = 1.16196 # Null hypothesis probability of 1.90e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 20.54 sec: 5.33324 ( -0.20303 0.2038 ) ph/cm2/s Energy fluence (15-150 keV) : 8.90575e-06 ( -3.10267e-07 3.09778e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.140 sec. to 1.140 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.11857 ( -0.0683421 0.0685676 ) Norm@50keV : 0.306865 ( -0.0131936 0.0131869 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 66.53 using 59 bins. Reduced chi-squared = 1.16719 # Null hypothesis probability of 1.82e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 35.6609 ( -1.5818 1.5831 ) ph/cm2/s Energy fluence (15-150 keV) : 3.18992e-06 ( -1.45882e-07 1.4611e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.140 sec. to 1.140 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.411558 ( -0.305933 0.327103 ) Epeak [keV] : 132.236 ( -24.2649 54.9763 ) Norm@50keV : 0.630308 ( -0.164456 0.238011 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 49.78 using 59 bins. Reduced chi-squared = 0.888929 # Null hypothesis probability of 7.08e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 35.0752 ( -1.5977 1.6001 ) ph/cm2/s Energy fluence (15-150 keV) : 3.15748e-06 ( -1.50504e-07 1.50173e-07 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 11.392 sec. Hardness ratio (energy fluence ratio) = 1.59345603006
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.0756203e-06 S(50-150 keV) = 5.830197e-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 = 9.368618633999752E-01, IMY = 7.102416133076762E-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: -239.904000 -1.504000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 256.1333 -37.7795 3.7 41.1 65.7 5.8389 3.1 8.0 4U 1700-377 256.2787 -36.2994 14.2 40.8 67.9 -1.4091 -0.8 10.6 GX 349+2 262.8376 -24.7835 10.7 34.8 86.5 0.9849 1.1 9.6 GX 1+4 264.6120 -44.5573 3.6 37.0 52.5 2.4618 3.2 8.5 4U 1735-44 268.5005 -1.5354 12.9 37.7 127.1 -0.9757 -0.9 9.4 SW J1753.5-0127 270.2279 -25.1728 11.0 28.1 86.3 0.6899 1.1 6.4 GX 5-1 270.3577 -25.6859 11.6 28.0 85.2 0.6948 1.1 4.5 GRS 1758-258 273.9463 -13.9277 5.1 26.9 111.8 1.3034 2.2 7.4 GX 17+2 275.8887 -30.3636 4.0 23.6 73.1 1.4192 2.9 1.9 H1820-303 284.8658 -24.7794 0.0 14.8 85.7 -0.0400 -0.1 12.6 HT1900.1-2455 288.7885 11.0166 6.0 35.5 167.4 0.9705 1.9 4.3 GRS 1915+105 299.6223 35.2151 3.5 57.6 -173.1 6.1671 3.3 1.8 Cyg X-1 263.1437 -33.7674 10.8 34.9 70.7 -1.0057 -1.1 8.7 GX 354-0 265.9443 -29.7994 3.7 32.1 77.3 2.2798 3.1 ------ UNKNOWN 263.1122 -57.8086 2.0 44.6 35.7 4.3793 5.7 ------ UNKNOWN 277.0884 -19.0394 3.2 22.4 102.3 1.8068 3.7 ------ UNKNOWN 292.4025 -72.3023 3.3 50.1 11.4 2.3154 3.5 ------ UNKNOWN 340.7245 -27.3154 2.3 36.4 -65.9 3.7455 5.1 ------ UNKNOWN 334.2474 7.4550 2.7 44.3 -120.5 6.5454 4.2 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -1.504000 19.040000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 255.8152 -37.7809 4.1 41.4 65.8 0.7339 2.8 9.0 4U 1700-377 256.5056 -36.3281 6.0 40.6 67.8 -0.4886 -1.9 6.6 GX 349+2 263.1066 -24.7425 19.5 34.5 86.6 0.0852 0.6 5.3 GX 1+4 264.7824 -44.3591 5.2 36.8 52.7 -0.2857 -2.2 5.7 4U 1735-44 268.4692 -1.3366 4.2 37.9 127.4 -0.4287 -2.7 9.2 SW J1753.5-0127 270.3401 -25.0930 63.2 28.0 86.4 -0.0188 -0.2 3.1 GX 5-1 270.2610 -25.7407 57.2 28.0 85.1 0.0211 0.2 2.2 GRS 1758-258 274.1268 -14.1690 5.1 26.6 111.5 0.2087 2.3 10.6 GX 17+2 275.8776 -30.5026 4.8 23.7 72.8 0.2130 2.4 8.5 H1820-303 284.9581 -25.0674 3.8 14.8 84.6 -0.2592 -3.1 9.8 HT1900.1-2455 288.7367 10.7851 6.9 35.3 167.2 0.1757 1.7 10.3 GRS 1915+105 299.5487 35.2768 7.8 57.7 -173.2 0.5205 1.5 5.0 Cyg X-1 263.1665 -33.8432 5.4 34.9 70.6 -0.2889 -2.1 8.9 GX 354-0 297.0983 -54.9909 2.3 32.7 12.0 0.5750 5.1 ------ UNKNOWN 317.7232 28.8233 3.2 53.8 -153.5 1.0845 3.6 ------ UNKNOWN 354.7237 -47.9979 0.4 49.6 -37.2 13.1304 28.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: