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 22:24:36 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger889785
======================================================================
Trigger: 00889785 Segment: 000
BAT Trigger Time: 572324397.12 [s; MET]
Trigger Stop: 572324398.144 [s; MET]
UTC: 2019-02-20T02:59:34.673220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 330.142349349267 Dec: -76.6910121240364 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.05
Image Trigger?: NO
Rate S/N Ratio: 14.560219778561 [ if not an image trigger ]
Image S/N Ratio: 9.05
Analysis Position: [ source = BAT ]
RA: 330.142349349267 Dec: -76.6910121240364 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 330.135316423617 Dec: -76.6701948837738 [deg; J2000]
{ 22h 00m 32.5s , -76d 40' 12.7" }
+/- 1.27494371989389 [arcmin] (estimated 90% radius based on SNR)
+/- 0.465767168414482 [arcmin] (formal 1-sigma fit error)
SNR: 21.4989342426043
Angular difference between the analysis and refined position is 1.252812 arcmin
Partial Coding Fraction: 0.46875 [ including projection effects ]
Duration
T90: 10 +/- 2
Measured from: -0.120000004768372
to: 9.87999999523163 [s; relative to TRIGTIME]
T50: 4 +/- 1
Measured from: 0.879999995231628
to: 4.87999999523163 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.87999999523163
to: 2.87999999523163 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.120000004768372
to: 11.8799999952316 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.583769 0.747544 0.350657 0.044812
0.040959 0.043984 0.037356 0.032845 [error]
Peak 0.088594 0.144092 0.059181 0.008910
0.011844 0.014862 0.012213 0.009664 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 12.000 -0.120 11.880
T90 10.000 -0.120 9.880
T50 4.000 0.880 4.880
Peak 1.000 1.880 2.880
====== 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: 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 -2.031 -0.138 0.133 - - - 8.89e-03 -8.10e-04 7.99e-04 90.690 57
CPL -0.775 -0.709 0.862 40.095 -6.282 7.014 4.73e-02 -2.87e-02 1.05e-01 80.300 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 -1.870 -0.226 0.212 - - - 1.80e-02 -2.92e-03 2.87e-03 79.610 57
CPL 0.501 -1.423 2.265 43.210 -6.178 10.543 4.38e-01 -4.38e-01 9.81e+00 69.490 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 2.25e-07 2.99e-07 2.93e-07 5.14e-07 9.85e-07 1.33e-06 erg/cm2
90%_error_low -2.34e-08 -2.21e-08 -3.59e-08 -1.15e-07 -8.37e-08 -1.57e-07 erg/cm2
90%_error_hi 2.39e-08 2.21e-08 3.63e-08 1.34e-07 8.48e-08 1.72e-07 erg/cm2
Peak flux PL 1.06e+00 8.57e-01 4.69e-01 3.76e-01 2.55e+00 2.76e+00 ph/cm2/s
90%_error_low -1.93e-01 -1.17e-01 -9.53e-02 -1.26e-01 -3.49e-01 -3.83e-01 ph/cm2/s
90%_error_hi 1.99e-01 1.17e-01 9.60e-02 1.55e-01 3.49e-01 3.84e-01 ph/cm2/s
Fluence CPL 2.01e-07 3.43e-07 2.71e-07 8.70e-08 8.82e-07 9.02e-07 erg/cm2
90%_error_low -2.72e-08 -3.24e-08 -4.94e-08 -5.44e-08 -9.23e-08 -1.07e-07 erg/cm2
90%_error_hi 2.74e-08 3.35e-08 4.55e-08 1.27e-07 9.79e-08 1.54e-07 erg/cm2
Peak flux CPL 8.67e-01 1.13e+00 4.45e-01 3.48e-02 2.47e+00 2.47e+00 ph/cm2/s
90%_error_low -2.33e-01 -1.95e-01 -1.56e-01 -3.48e-02 -3.52e-01 -3.54e-01 ph/cm2/s
90%_error_hi 2.33e-01 2.11e-01 1.35e-01 1.04e-01 3.53e-01 3.57e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 330.1353 -76.6702 0.0090 38.1911 -143.3517 1.7453922 21.499 TRIG_00889785 Foreground time interval of the image: -0.120 10.381 (delta_t = 10.501 [sec]) Background time interval of the image: -239.120 -0.120 (delta_t = 239.000 [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 -0.120 sec. to 11.880 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.03061 ( -0.137789 0.132559 ) Norm@50keV : 8.88649E-03 ( -0.000809824 0.000798624 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 90.69 using 59 PHA bins. # Reduced chi-squared = 1.591 for 57 degrees of freedom # Null hypothesis probability = 3.007259e-03 Photon flux (15-150 keV) in 12 sec: 1.35219 ( -0.10071 0.10077 ) ph/cm2/s Energy fluence (15-150 keV) : 9.85374e-07 ( -8.3738e-08 8.47922e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.120 sec. to 11.880 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.775417 ( -0.70867 0.861485 ) Epeak [keV] : 40.0953 ( -6.28147 7.01425 ) Norm@50keV : 4.73217E-02 ( -0.028753 0.105022 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 80.30 using 59 PHA bins. # Reduced chi-squared = 1.434 for 56 degrees of freedom # Null hypothesis probability = 1.829973e-02 Photon flux (15-150 keV) in 12 sec: 1.29015 ( -0.10546 0.10589 ) ph/cm2/s Energy fluence (15-150 keV) : 8.81681e-07 ( -9.23279e-08 9.79474e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.880 sec. to 2.880 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.8697 ( -0.226112 0.211614 ) Norm@50keV : 1.80287E-02 ( -0.0029241 0.00286686 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 79.61 using 59 PHA bins. # Reduced chi-squared = 1.397 for 57 degrees of freedom # Null hypothesis probability = 2.563886e-02 Photon flux (15-150 keV) in 1 sec: 2.55482 ( -0.34886 0.3489 ) ph/cm2/s Energy fluence (15-150 keV) : 1.65764e-07 ( -2.64291e-08 2.68687e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.880 sec. to 2.880 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.501238 ( -1.43495 2.25263 ) Epeak [keV] : 43.2104 ( -6.12201 10.5987 ) Norm@50keV : 0.437649 ( -0.45185 9.80023 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 69.49 using 59 PHA bins. # Reduced chi-squared = 1.241 for 56 degrees of freedom # Null hypothesis probability = 1.062866e-01 Photon flux (15-150 keV) in 1 sec: 2.47245 ( -0.35215 0.35269 ) ph/cm2/s Energy fluence (15-150 keV) : 1.43747e-07 ( -2.53284e-08 2.82021e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
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 = -6.311577760349268E-01, IMY = 4.695657479227315E-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: -239.120000 -0.120000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.1571 -60.6493 5.1 44.8 151.7 -1.8807 -2.3 4.9 Cen X-3 186.9112 -62.7407 3.8 49.0 161.3 2.7952 3.1 7.2 GX 301-2 86.4758 -5.6580 3.0 52.3 29.8 5.0467 3.9 ------ UNKNOWN 180.1996 -58.1628 2.5 50.2 154.0 4.7202 4.6 ------ UNKNOWN 95.1514 -44.3058 2.5 18.0 68.1 1.3296 4.5 ------ UNKNOWN 241.3735 -64.5817 2.6 57.7 -171.4 6.7074 4.4 ------ UNKNOWN 357.5974 -65.3765 2.8 35.6 -120.1 1.9191 4.1 ------ UNKNOWN 19.3388 -35.8731 3.6 42.3 -68.9 4.0704 3.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.120000 10.380600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.5567 -60.6272 5.0 44.9 151.8 -0.3068 -2.3 7.1 Cen X-3 186.9598 -62.7142 9.0 49.1 161.3 -0.1933 -1.3 9.0 GX 301-2 80.7240 -5.2503 1.9 52.2 22.6 1.0534 6.1 ------ UNKNOWN 205.0691 -60.1765 2.3 56.2 168.2 1.3274 5.0 ------ UNKNOWN 64.4611 -14.1312 2.5 43.9 0.5 0.3670 4.7 ------ UNKNOWN 259.7251 -71.1364 2.2 51.6 -162.6 0.7326 5.1 ------ UNKNOWN 330.1354 -76.6702 0.5 38.2 -143.4 1.7453 21.5 ------ UNKNOWN 341.6834 -75.8537 2.4 36.2 -140.0 0.3546 4.8 ------ UNKNOWN 274.6603 -65.0998 2.5 56.8 -154.8 1.4722 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 67.380570 962.924600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.6338 -62.9459 0.0 38.5 112.7 8.6627 1.2 10.6 GX 301-2 255.9228 -37.8050 13.7 49.8 -178.0 5.1486 0.8 3.8 4U 1700-377 256.5206 -36.3739 5.4 51.0 -176.8 14.2657 2.1 5.1 GX 349+2 264.8194 -44.4213 5.8 41.4 -171.8 -8.2012 -2.0 3.7 4U 1735-44 275.8834 -30.2616 5.7 52.7 -155.0 16.1880 2.0 6.7 H1820-303 262.9464 -33.9564 11.4 51.9 -169.5 -6.9889 -1.0 7.6 GX 354-0 97.3418 -50.2838 2.9 48.7 44.3 28.8518 4.1 ------ UNKNOWN 221.3293 -47.9699 3.2 47.7 145.9 35.1117 3.6 ------ UNKNOWN