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 v2.46
Process Start Time: Sun Mar 17 23:04:07 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger881709
======================================================================
Trigger: 00881709 Segment: 000
BAT Trigger Time: 568242253.376 [s; MET]
Trigger Stop: 568242254.4 [s; MET]
UTC: 2019-01-03T21:03:51.185580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 212.574478514615 Dec: 35.2610232533427 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.37
Image Trigger?: NO
Rate S/N Ratio: 63.2692658405327 [ if not an image trigger ]
Image S/N Ratio: 9.37
Analysis Position: [ source = BAT ]
RA: 212.574478514615 Dec: 35.2610232533427 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 212.560921696406 Dec: 35.2539317989469 [deg; J2000]
{ 14h 10m 14.6s , +35d 15' 14.2" }
+/- 1.32220580279357 [arcmin] (estimated 90% radius based on SNR)
+/- 0.700377818825502 [arcmin] (formal 1-sigma fit error)
SNR: 20.4095773018424
Angular difference between the analysis and refined position is 0.788799 arcmin
Partial Coding Fraction: 0.0625 [ including projection effects ]
Duration
T90: 19.5199999809265 +/- 2.71679818444433
Measured from: -4.87999999523163
to: 14.6399999856949 [s; relative to TRIGTIME]
T50: 9.31200003623962 +/- 0.486621028293069
Measured from: 0.527999997138977
to: 9.8400000333786 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.595999956130981
to: 1.59599995613098 [s; relative to TRIGTIME]
Total Fluence
Measured from: -10.432000041008
to: 16.1759999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.337435 6.750801 5.436405 1.209056
0.204463 0.217145 0.193132 0.141426 [error]
Peak 0.377628 0.673705 0.644780 0.202030
0.047461 0.056827 0.058308 0.039863 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 26.608 -10.432 16.176
T90 19.520 -4.880 14.640
T50 9.312 0.528 9.840
Peak 1.000 0.596 1.596
====== 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 -1.630 -0.065 0.065 - - - 4.96e-02 -1.86e-03 1.86e-03 74.910 57
CPL -0.992 -0.278 0.296 84.988 -11.879 25.244 9.91e-02 -2.53e-02 3.65e-02 58.410 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 -1.411 -0.145 0.142 - - - 1.33e-01 -1.24e-02 1.24e-02 71.270 57
CPL -0.581 -0.599 0.694 91.928 -21.506 95.203 3.36e-01 -1.61e-01 3.78e-01 65.410 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 1.90e-06 3.23e-06 4.18e-06 1.09e-05 1.23e-05 2.02e-05 erg/cm2
90%_error_low -1.28e-07 -1.33e-07 -1.94e-07 -1.05e-06 -4.78e-07 -1.20e-06 erg/cm2
90%_error_hi 1.31e-07 1.33e-07 1.93e-07 1.12e-06 4.79e-07 1.25e-06 erg/cm2
Peak flux PL 5.85e-04 6.98e-03 7.51e-02 9.15e+00 3.30e-01 8.99e+00 ph/cm2/s
90%_error_low N/A N/A N/A N/A N/A N/A ph/cm2/s
90%_error_hi N/A N/A N/A N/A N/A N/A ph/cm2/s
Fluence CPL 1.66e-06 3.39e-06 4.42e-06 5.21e-06 1.19e-05 1.47e-05 erg/cm2
90%_error_low -1.59e-07 -1.53e-07 -2.24e-07 -1.30e-06 -5.14e-07 -1.38e-06 erg/cm2
90%_error_hi 1.63e-07 1.54e-07 2.27e-07 1.83e-06 5.13e-07 1.85e-06 erg/cm2
Peak flux CPL 4.27e+00 5.77e+00 4.46e+00 2.42e+00 1.60e+01 1.69e+01 ph/cm2/s
90%_error_low -9.09e-01 -6.34e-01 -5.52e-01 -9.91e-01 -1.55e+00 -1.86e+00 ph/cm2/s
90%_error_hi 9.51e-01 6.51e-01 5.68e-01 1.62e+00 1.55e+00 2.11e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 212.5609 35.2539 0.0094 48.5950 143.7816 19.1008849 20.410 TRIG_00881709 Foreground time interval of the image: -10.432 16.176 (delta_t = 26.608 [sec]) Background time interval of the image: -239.376 -10.432 (delta_t = 228.944 [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 -10.432 sec. to 16.176 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.62959 ( -0.0650154 0.0647583 ) Norm@50keV : 4.96319E-02 ( -0.00186147 0.00186076 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 74.91 using 59 PHA bins. # Reduced chi-squared = 1.314 for 57 degrees of freedom # Null hypothesis probability = 5.599662e-02 Photon flux (15-150 keV) in 26.61 sec: 6.43801 ( -0.26319 0.264 ) ph/cm2/s Energy fluence (15-150 keV) : 1.2311e-05 ( -4.78309e-07 4.78796e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.432 sec. to 16.176 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.992416 ( -0.277909 0.296062 ) Epeak [keV] : 84.9884 ( -11.8793 25.2435 ) Norm@50keV : 9.91097E-02 ( -0.0252581 0.0365017 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.41 using 59 PHA bins. # Reduced chi-squared = 1.043 for 56 degrees of freedom # Null hypothesis probability = 3.869927e-01 Photon flux (15-150 keV) in 26.61 sec: 6.19589 ( -0.27966 0.28085 ) ph/cm2/s Energy fluence (15-150 keV) : 1.19145e-05 ( -5.13943e-07 5.12777e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.596 sec. to 1.596 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.41128 ( -0.144585 0.142398 ) Norm@50keV : 0.133474 ( -0.0123802 0.0123628 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 71.27 using 59 PHA bins. # Reduced chi-squared = 1.250 for 57 degrees of freedom # Null hypothesis probability = 9.679020e-02 Photon flux (15-150 keV) in 1 sec: 0.329948 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.28695e-06 ( -1.29106e-07 1.29496e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.596 sec. to 1.596 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.581363 ( -0.599014 0.693857 ) Epeak [keV] : 91.9278 ( -21.5056 95.2032 ) Norm@50keV : 0.335973 ( -0.160584 0.37792 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.41 using 59 PHA bins. # Reduced chi-squared = 1.168 for 56 degrees of freedom # Null hypothesis probability = 1.824458e-01 Photon flux (15-150 keV) in 1 sec: 16.0037 ( -1.549 1.5506 ) ph/cm2/s Energy fluence (15-150 keV) : 1.25849e-06 ( -1.36291e-07 1.3518e-07 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 19.52 sec. Hardness ratio (energy fluence ratio) = 1.30298687714
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 5.045941e-06 S(50-150 keV) = 6.868649e-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 = -9.149408666892626E-01, IMY = -6.700877383759765E-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: -239.376000 -10.432000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9688 -15.6495 0.4 17.7 -93.9 8.3201 27.4 0.8 Sco X-1 254.4111 35.3644 4.8 53.2 -172.5 1.8549 2.4 2.6 Her X-1 255.9537 -37.9719 62.5 37.0 -59.0 -0.0842 -0.2 7.8 4U 1700-377 256.4864 -36.2966 13.6 36.3 -61.7 0.4157 0.8 8.0 GX 349+2 263.0381 -24.7972 4.9 36.4 -83.4 1.3836 2.4 3.5 GX 1+4 264.7427 -44.4464 56.9 46.1 -57.1 0.2305 0.2 0.2 4U 1735-44 268.2151 -1.5209 0.0 41.7 -120.7 -0.4356 -0.6 10.0 SW J1753.5-0127 263.0922 -33.8895 10.7 39.7 -69.6 0.7715 1.1 6.1 GX 354-0 247.8508 -47.8162 1.7 40.4 -41.4 2.8313 6.7 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -10.432000 16.176000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.7946 -15.7181 14.8 17.6 -93.6 0.0791 0.8 11.7 Sco X-1 254.3396 35.3187 8.1 53.2 -172.5 -0.5898 -1.4 6.0 Her X-1 255.8090 -37.8169 29.1 36.8 -59.1 -0.0574 -0.4 8.6 4U 1700-377 256.2443 -36.5028 59.6 36.3 -61.2 0.0279 0.2 10.4 GX 349+2 263.0836 -24.8760 4.7 36.5 -83.3 -0.4382 -2.4 8.8 GX 1+4 264.8413 -44.4441 9.3 46.2 -57.2 -0.4224 -1.2 4.2 4U 1735-44 268.3645 -1.3746 5.8 41.9 -120.8 -0.4476 -2.0 4.7 SW J1753.5-0127 262.8331 -33.7540 3.0 39.4 -69.6 0.8569 3.8 9.2 GX 354-0 212.5609 35.2539 0.6 48.6 143.8 19.0855 19.9 ------ UNKNOWN 232.6764 8.8602 2.5 20.8 174.9 0.4841 4.6 ------ UNKNOWN 251.4604 37.0044 2.9 53.4 -176.1 1.9245 4.0 ------ UNKNOWN 228.0262 -44.5381 2.4 33.3 -21.0 0.5227 4.9 ------ UNKNOWN 268.2604 3.8103 2.4 43.4 -128.1 0.9440 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 82.124600 879.924600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5101 35.3745 2.5 34.0 -131.4 4.0061 4.7 3.2 Her X-1 181.4229 48.3333 3.4 26.4 100.6 3.1227 3.4 ------ UNKNOWN 295.3801 63.7254 2.4 55.8 -176.6 11.0465 4.8 ------ UNKNOWN 272.0972 41.4374 2.9 46.2 -145.1 5.3102 3.9 ------ UNKNOWN