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 15:28:55 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1222885
======================================================================
Trigger: 01222885 Segment: 000
BAT Trigger Time: 735164681.472 [s; MET]
Trigger Stop: 735164689.664 [s; MET]
UTC: 2024-04-18T20:24:08.178240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 239.321942835305 Dec: 23.6073757940438 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.96
Image Trigger?: NO
Rate S/N Ratio: 12.6491106406735 [ if not an image trigger ]
Image S/N Ratio: 7.96
Analysis Position: [ source = BAT ]
RA: 239.321942835305 Dec: 23.6073757940438 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 239.333929421332 Dec: 23.6122559382867 [deg; J2000]
{ 15h 57m 20.1s , +23d 36' 44.1" }
+/- 2.20769619860437 [arcmin] (estimated 90% radius based on SNR)
+/- 1.18526046304639 [arcmin] (formal 1-sigma fit error)
SNR: 9.81242858095205
Angular difference between the analysis and refined position is 0.721117 arcmin
Partial Coding Fraction: 0.7421875 [ including projection effects ]
Duration
T90: 12.4279999732971 +/- 3.54442492911188
Measured from: 0.271999955177307
to: 12.6999999284744 [s; relative to TRIGTIME]
T50: 5.84799993038177 +/- 2.92192889758202
Measured from: 2.56400001049042
to: 8.41199994087219 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.80400002002716
to: 2.80400002002716 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0640000104904175
to: 13.6679999828339 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.201413 0.156846 0.086877 -0.016490
0.026913 0.024933 0.020544 0.016582 [error]
Peak 0.033257 0.011007 0.015165 0.006457
0.007242 0.006717 0.005600 0.004339 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 13.732 -0.064 13.668
T90 12.428 0.272 12.700
T50 5.848 2.564 8.412
Peak 1.000 1.804 2.804
====== 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 -2.123 -0.324 0.295 - - - 1.77e-03 -3.86e-04 3.73e-04 57.470 57
CPL -1.522 -0.574 1.418 32.093 -31.137 -32.093 4.01e-03 -4.01e-03 2.42e-02 56.670 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 -2.161 -0.885 0.699 - - - 3.12e-03 -1.60e-03 1.42e-03 59.230 57
CPL -2.103 -1.474 0.658 47.001 N/A N/A 2.88e-03 N/A N/A 59.130 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 5.59e-08 7.04e-08 6.47e-08 1.04e-07 2.26e-07 2.95e-07 erg/cm2
90%_error_low -1.18e-08 -1.15e-08 -1.85e-08 -4.83e-08 -4.30e-08 -7.38e-08 erg/cm2
90%_error_hi 1.21e-08 1.14e-08 1.94e-08 7.06e-08 4.45e-08 9.05e-08 erg/cm2
Peak flux PL 2.43e-01 1.66e-01 7.43e-02 4.60e-02 5.06e-01 5.30e-01 ph/cm2/s
90%_error_low -1.11e-01 -5.72e-02 -7.43e-02 -4.60e-02 -1.61e-01 -1.70e-01 ph/cm2/s
90%_error_hi 1.16e-01 5.39e-02 4.99e-02 8.68e-02 1.61e-01 1.71e-01 ph/cm2/s
Fluence CPL 5.36e-08 7.58e-08 6.21e-08 3.68e-08 2.14e-07 2.28e-07 erg/cm2
90%_error_low -1.31e-08 -1.41e-08 -2.26e-08 -3.16e-08 -4.53e-08 -5.84e-08 erg/cm2
90%_error_hi 1.30e-08 1.56e-08 2.13e-08 1.29e-07 4.99e-08 1.50e-07 erg/cm2
Peak flux CPL 2.33e-01 9.71e-02 3.41e-02 9.79e-03 3.62e-01 3.96e-01 ph/cm2/s
90%_error_low -1.15e-01 -9.71e-02 -3.41e-02 -9.79e-03 -1.99e-01 -2.02e-01 ph/cm2/s
90%_error_hi 1.15e-01 1.09e-01 7.18e-02 7.68e-02 2.70e-01 2.79e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 239.3339 23.6123 0.0197 20.3989 -109.5028 0.4550538 9.812 TRIG_01222885 Foreground time interval of the image: -0.064 13.668 (delta_t = 13.732 [sec]) Background time interval of the image: -239.472 -0.064 (delta_t = 239.408 [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 -0.064 sec. to 13.668 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.12287 ( -0.323948 0.294676 ) Norm@50keV : 1.77042E-03 ( -0.000385817 0.000373075 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 57.47 using 59 bins. Reduced chi-squared = 1.00825 # Null hypothesis probability of 4.58e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 13.73 sec: 0.281744 ( -0.04449 0.044496 ) ph/cm2/s Energy fluence (15-150 keV) : 2.26413e-07 ( -4.30253e-08 4.4519e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.064 sec. to 13.668 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.52221 ( -0.574156 1.41798 ) Epeak [keV] : 32.0927 ( -31.1362 -32.0915 ) Norm@50keV : 4.01364E-03 ( -0.00401334 0.0241761 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 56.67 using 59 bins. Reduced chi-squared = 1.01196 # Null hypothesis probability of 4.50e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 13.73 sec: 0.276304 ( -0.045423 0.045564 ) ph/cm2/s Energy fluence (15-150 keV) : 2.13644e-07 ( -4.53301e-08 4.99285e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.804 sec. to 2.804 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.16137 ( -0.885031 0.699387 ) Norm@50keV : 3.11944E-03 ( -0.00160426 0.00142058 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 59.23 using 59 bins. Reduced chi-squared = 1.03912 # Null hypothesis probability of 3.94e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.506221 ( -0.160756 0.160752 ) ph/cm2/s Energy fluence (15-150 keV) : 2.9183e-08 ( -1.17308e-08 1.26703e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.804 sec. to 2.804 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -3.15843 ( -0.426597 1.70499 ) Epeak [keV] : 337.095 ( ) Norm@50keV : 1.05122E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 57.97 using 59 bins. Reduced chi-squared = 1.03518 # Null hypothesis probability of 4.03e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.361758 ( -0.198579 0.269878 ) ph/cm2/s Energy fluence (15-150 keV) : 2.93623e-08 ( -2.12978e-08 9.82632e-09 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 12.428 sec. Hardness ratio (energy fluence ratio) = 0.918396043623
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.2634942e-07 S(50-150 keV) = 1.0006744e-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 = -1.241514849607829E-01, IMY = 3.505392901134579E-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: -239.472000 -0.064000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9752 -15.6438 0.4 24.7 14.7 9.6367 27.4 0.3 Sco X-1 254.4527 35.2774 6.1 37.3 -99.4 1.6974 1.9 3.9 Her X-1 256.2029 -37.8038 5.1 48.6 21.8 2.1106 2.3 10.5 4U 1700-377 256.3761 -36.5204 11.5 47.6 20.7 -0.8454 -1.0 6.5 GX 349+2 263.0098 -24.7473 130.2 42.9 3.5 0.0551 0.1 0.1 GX 1+4 268.2772 -1.3382 5.7 37.7 -33.2 0.9746 2.0 8.8 SW J1753.5-0127 270.3176 -25.1171 8.2 48.5 -1.6 0.9369 1.4 2.9 GX 5-1 270.4842 -25.7357 9.3 48.9 -1.0 0.8209 1.2 9.8 GRS 1758-258 273.9624 -14.1469 4.2 46.6 -17.0 1.7605 2.7 7.1 GX 17+2 275.9073 -30.3994 4.9 55.5 0.8 3.4320 2.4 2.1 H1820-303 263.1059 -33.7700 6.3 49.0 12.6 1.6170 1.8 7.0 GX 354-0 240.9920 9.3759 2.8 10.8 -67.0 1.2734 4.1 ------ UNKNOWN 191.8623 46.3214 2.1 53.6 -164.5 4.9999 5.5 ------ UNKNOWN 285.9878 -20.1905 2.4 59.4 -14.8 7.6908 4.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.064000 13.668000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0996 -15.7346 6.2 24.8 14.6 -0.0845 -1.9 9.0 Sco X-1 254.5366 35.2404 8.0 37.3 -99.2 0.1503 1.4 7.2 Her X-1 256.0010 -37.8315 56.9 48.5 22.0 -0.0356 -0.2 1.0 4U 1700-377 256.6431 -36.3833 10.7 47.6 20.3 -0.1549 -1.1 10.3 GX 349+2 262.8305 -24.7337 33.8 42.7 3.6 0.0244 0.3 9.8 GX 1+4 268.3110 -1.2933 6.5 37.7 -33.2 0.1079 1.8 10.1 SW J1753.5-0127 270.2961 -25.2082 6.6 48.5 -1.4 -0.1721 -1.7 7.8 GX 5-1 270.4345 -25.7076 10.9 48.9 -1.0 0.1081 1.1 7.4 GRS 1758-258 273.9564 -14.0391 5.8 46.5 -17.1 0.1568 2.0 2.9 GX 17+2 276.0247 -30.5150 0.0 55.6 0.8 -0.2232 -0.9 10.3 H1820-303 263.0120 -33.9577 7.1 49.1 12.9 0.2233 1.6 7.5 GX 354-0 239.3339 23.6122 1.2 20.4 -109.5 0.4550 9.8 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 105.428600 596.928590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9769 -15.6318 1.0 39.6 36.1 16.7512 11.3 0.5 Sco X-1 254.3716 35.2819 6.2 17.5 -90.6 1.2500 1.8 5.6 Her X-1 268.2193 -1.4531 4.7 37.6 -7.6 -2.2382 -2.5 8.9 SW J1753.5-0127 273.9513 -14.1205 8.5 50.7 -0.8 1.6067 1.4 6.0 GX 17+2 288.8257 11.0210 11.2 48.6 -39.2 1.6352 1.0 4.8 GRS 1915+105