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: Tue Dec 26 22:32:29 EST 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1195887
======================================================================
Trigger: 01195887 Segment: 000
BAT Trigger Time: 721405072.064 [s; MET]
Trigger Stop: 721405073.088 [s; MET]
UTC: 2023-11-11T14:17:19.712860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 290.233898035718 Dec: 52.4469715812306 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.51
Image Trigger?: NO
Rate S/N Ratio: 23.6643191323985 [ if not an image trigger ]
Image S/N Ratio: 12.51
Analysis Position: [ source = BAT ]
RA: 290.233898035718 Dec: 52.4469715812306 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 290.198774660372 Dec: 52.4400635289037 [deg; J2000]
{ 19h 20m 47.7s , +52d 26' 24.2" }
+/- 0.772963180958617 [arcmin] (estimated 90% radius based on SNR)
+/- 0.2401173660246 [arcmin] (formal 1-sigma fit error)
SNR: 43.9431830693587
Angular difference between the analysis and refined position is 1.349768 arcmin
Partial Coding Fraction: 0.6171875 [ including projection effects ]
Duration
T90: 34.0759998559952 +/- 4.8503395055933
Measured from: -3.74399995803833
to: 30.3319998979568 [s; relative to TRIGTIME]
T50: 11.6119998693466 +/- 0.860306927820265
Measured from: 0.0160000324249268
to: 11.6279999017715 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0679999589920044
to: 1.067999958992 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.32000005245209
to: 40.3400000333786 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.439329 1.961802 1.467724 0.377686
0.061812 0.065682 0.057305 0.048656 [error]
Peak 0.079637 0.125354 0.090236 0.029252
0.010127 0.011642 0.010181 0.007737 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 45.660 -5.320 40.340
T90 34.076 -3.744 30.332
T50 11.612 0.016 11.628
Peak 1.000 0.068 1.068
====== 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 -1.580 -0.070 0.070 - - - 7.87e-03 -3.10e-04 3.09e-04 53.710 57
CPL -1.183 -0.282 0.301 106.394 -25.422 123.170 1.23e-02 -3.25e-03 4.80e-03 47.770 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 -1.556 -0.172 0.169 - - - 2.15e-02 -2.32e-03 2.30e-03 66.850 57
CPL -1.009 -0.619 0.789 88.060 -27.755 -88.060 4.15e-02 -2.12e-02 6.39e-02 64.910 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 4.94e-07 8.65e-07 1.16e-06 3.18e-06 3.37e-06 5.69e-06 erg/cm2
90%_error_low -3.47e-08 -3.66e-08 -5.83e-08 -3.37e-07 -1.41e-07 -3.79e-07 erg/cm2
90%_error_hi 3.55e-08 3.65e-08 5.82e-08 3.63e-07 1.41e-07 3.99e-07 erg/cm2
Peak flux PL 9.32e-01 9.07e-01 6.17e-01 6.58e-01 2.72e+00 3.11e+00 ph/cm2/s
90%_error_low -1.52e-01 -9.76e-02 -8.33e-02 -1.61e-01 -2.83e-01 -3.25e-01 ph/cm2/s
90%_error_hi 1.58e-01 9.71e-02 8.26e-02 1.88e-01 2.84e-01 3.27e-01 ph/cm2/s
Fluence CPL 4.66e-07 6.48e-07 6.95e-07 1.69e-06 2.27e-06 3.51e-06 erg/cm2
90%_error_low -4.46e-08 -5.52e-08 -4.02e-08 -1.41e-07 -1.52e-07 -1.25e-07 erg/cm2
90%_error_hi 3.07e-08 5.74e-08 4.62e-08 1.50e-07 1.60e-07 1.56e-07 erg/cm2
Peak flux CPL 8.58e-01 9.64e-01 6.45e-01 3.58e-01 2.68e+00 2.82e+00 ph/cm2/s
90%_error_low -1.79e-01 -1.20e-01 -9.26e-02 -1.88e-01 -2.90e-01 -3.55e-01 ph/cm2/s
90%_error_hi 1.82e-01 1.25e-01 9.49e-02 3.65e-01 2.89e-01 4.62e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 290.1988 52.4401 0.0044 35.1232 -144.9016 4.4318596 43.943 TRIG_01195887 Foreground time interval of the image: -5.320 13.237 (delta_t = 18.557 [sec]) Background time interval of the image: -239.064 -5.320 (delta_t = 233.744 [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 -5.320 sec. to 40.340 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.57969 ( -0.0704107 0.0701956 ) Norm@50keV : 7.86962E-03 ( -0.000309696 0.000309378 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 53.71 using 59 bins. Reduced chi-squared = 0.942281 # Null hypothesis probability of 5.99e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 45.66 sec: 1.00506 ( -0.041645 0.04174 ) ph/cm2/s Energy fluence (15-150 keV) : 3.3695e-06 ( -1.40667e-07 1.41134e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.320 sec. to 40.340 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.18279 ( -0.281534 0.301273 ) Epeak [keV] : 106.394 ( -25.4217 123.17 ) Norm@50keV : 1.22841E-02 ( -0.00325353 0.00480189 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 47.77 using 59 bins. Reduced chi-squared = 0.853036 # Null hypothesis probability of 7.75e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 45.66 sec: 0.981459 ( -0.044619 0.044701 ) ph/cm2/s Energy fluence (15-150 keV) : 2.26535e-06 ( -1.51786e-07 1.60173e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.068 sec. to 1.068 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.55624 ( -0.172355 0.169486 ) Norm@50keV : 2.14502E-02 ( -0.00231602 0.00229796 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 66.85 using 59 bins. Reduced chi-squared = 1.17281 # Null hypothesis probability of 1.75e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 2.72048 ( -0.2835 0.28371 ) ph/cm2/s Energy fluence (15-150 keV) : 2.01786e-07 ( -2.34496e-08 2.36431e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.068 sec. to 1.068 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.00867 ( -0.619359 0.788987 ) Epeak [keV] : 88.0603 ( -27.7553 -88.0605 ) Norm@50keV : 4.14900E-02 ( -0.0212228 0.0639227 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 64.91 using 59 bins. Reduced chi-squared = 1.15911 # Null hypothesis probability of 1.94e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 2.67765 ( -0.28981 0.28905 ) ph/cm2/s Energy fluence (15-150 keV) : 1.94639e-07 ( -2.52676e-08 2.53141e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 34.076 sec. Hardness ratio (energy fluence ratio) = 1.33822800624
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.3599233e-06 S(50-150 keV) = 2.0096235e-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 = -5.755117822250061E-01, IMY = 4.044529944815041E-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: -239.064000 -5.320000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.6142 35.1948 1.3 51.0 -159.0 8.0134 8.7 1.2 Cyg X-1 308.2034 40.9745 5.2 44.3 -167.0 1.3981 2.2 4.4 Cyg X-3 326.0531 38.3853 5.4 45.3 173.2 1.7871 2.1 6.8 Cyg X-2 341.7406 50.7953 2.6 32.1 156.9 2.4059 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -5.320000 13.236590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.6924 35.2691 5.4 50.9 -159.1 -0.4039 -2.1 6.4 Cyg X-1 307.9560 41.0976 5.1 44.2 -166.7 0.2605 2.3 11.2 Cyg X-3 326.2554 38.1584 5.5 45.5 172.9 -0.3026 -2.1 10.6 Cyg X-2 77.6332 44.7854 2.6 44.6 50.7 1.4478 4.5 ------ UNKNOWN 0.6335 66.7972 2.3 15.8 133.2 0.3723 5.1 ------ UNKNOWN 124.3693 45.3621 2.5 49.5 6.2 0.9749 4.6 ------ UNKNOWN 290.1988 52.4401 0.3 35.1 -144.9 4.4317 43.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 87.236590 401.636600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4395 35.3926 5.6 30.5 -78.4 1.3850 2.1 3.1 Her X-1 288.7725 10.9959 6.8 41.5 -146.5 -1.4142 -1.7 3.4 GRS 1915+105 299.6205 35.1989 0.5 18.5 -173.4 11.5476 22.3 1.5 Cyg X-1 308.1290 40.9178 7.6 16.8 157.8 0.8168 1.5 2.3 Cyg X-3 326.1920 38.3208 192.7 28.5 136.6 0.0409 0.1 1.0 Cyg X-2 34.0694 74.1259 3.2 43.7 53.9 7.3578 3.6 ------ UNKNOWN 309.6326 34.5486 2.5 22.6 166.0 2.3332 4.6 ------ UNKNOWN 292.1352 53.2047 2.8 1.4 87.4 2.0903 4.2 ------ UNKNOWN 312.7755 -3.1664 2.1 58.8 -175.2 11.8019 5.4 ------ UNKNOWN 233.6059 33.1846 2.3 44.4 -61.2 10.9472 4.9 ------ UNKNOWN