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: Fri Jul 6 12:16:48 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger840853
======================================================================
Trigger: 00840853 Segment: 000
BAT Trigger Time: 550597000 [s; MET]
Trigger Stop: 550597080 [s; MET]
UTC: 2018-06-13T15:36:18.900460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 211.562192886621 Dec: -43.0756203733291 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.59
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.59
Analysis Position: [ source = BAT ]
RA: 211.562192886621 Dec: -43.0756203733291 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 211.544265791263 Dec: -43.0831429532591 [deg; J2000]
{ 14h 06m 10.6s , -43d 04' 59.3" }
+/- 1.85723627684951 [arcmin] (estimated 90% radius based on SNR)
+/- 0.852963074257006 [arcmin] (formal 1-sigma fit error)
SNR: 12.56094864317
Angular difference between the analysis and refined position is 0.906069 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 50.8159999847412 +/- 8.35998099089474
Measured from: 27.944000005722
to: 78.7599999904633 [s; relative to TRIGTIME]
T50: 24.0640000104904 +/- 7.52648664610883
Measured from: 37.3680000305176
to: 61.432000041008 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 42.9880000352859
to: 43.9880000352859 [s; relative to TRIGTIME]
Total Fluence
Measured from: 25.3200000524521
to: 82.567999958992 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.349949 0.497258 0.212599 0.041817
0.041137 0.044114 0.039831 0.039776 [error]
Peak 0.016946 0.014659 0.010828 0.010434
0.005439 0.005933 0.005335 0.005379 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 57.248 25.320 82.568
T90 50.816 27.944 78.760
T50 24.064 37.368 61.432
Peak 1.000 42.988 43.988
====== 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 -1.627 -0.188 0.184 - - - 1.17e-03 -1.55e-04 1.53e-04 82.250 57
CPL 0.814 -1.201 1.781 43.489 -6.069 9.590 3.65e-02 -3.65e-02 4.44e-01 68.040 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 -1.627 -0.718 0.654 - - - 2.42e-03 -1.17e-03 1.14e-03 61.660 57
CPL 0.563 -2.473 -0.563 43.592 -16.318 7182.348 5.30e-02 -5.30e-02 2.45e+05 59.790 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 9.63e-08 1.64e-07 2.12e-07 5.55e-07 6.24e-07 1.03e-06 erg/cm2
90%_error_low -1.53e-08 -1.89e-08 -3.64e-08 -1.66e-07 -8.76e-08 -2.09e-07 erg/cm2
90%_error_hi 1.55e-08 1.89e-08 3.71e-08 2.09e-07 8.98e-08 2.45e-07 erg/cm2
Peak flux PL 1.12e-01 1.05e-01 6.80e-02 6.80e-02 3.13e-01 3.53e-01 ph/cm2/s
90%_error_low -5.99e-02 -4.36e-02 -3.86e-02 -6.80e-02 -1.30e-01 -1.49e-01 ph/cm2/s
90%_error_hi 6.47e-02 4.36e-02 4.15e-02 1.06e-01 1.31e-01 1.61e-01 ph/cm2/s
Fluence CPL 8.68e-08 2.18e-07 1.53e-07 1.67e-08 4.73e-07 4.74e-07 erg/cm2
90%_error_low -1.77e-08 -3.12e-08 -5.66e-08 -1.43e-08 -7.45e-08 -7.56e-08 erg/cm2
90%_error_hi 1.76e-08 3.16e-08 5.80e-08 6.00e-08 9.17e-08 1.04e-07 erg/cm2
Peak flux CPL 1.00e-01 1.55e-01 4.21e-02 8.07e-04 2.98e-01 2.98e-01 ph/cm2/s
90%_error_low -6.73e-02 -7.12e-02 -4.21e-02 -8.07e-04 -1.21e-01 -1.21e-01 ph/cm2/s
90%_error_hi 7.30e-02 7.52e-02 6.27e-02 7.81e-02 1.24e-01 1.25e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 211.5443 -43.0831 0.0153 17.8943 165.8796 1.1509516 12.561 TRIG_00840853 Foreground time interval of the image: 25.320 82.568 (delta_t = 57.248 [sec]) Background time interval of the image: -239.000 25.320 (delta_t = 264.320 [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 25.320 sec. to 82.568 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.62654 ( -0.187961 0.183723 ) Norm@50keV : 1.16970E-03 ( -0.000154633 0.000152768 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 82.25 using 59 PHA bins. # Reduced chi-squared = 1.443 for 57 degrees of freedom # Null hypothesis probability = 1.596061e-02 Photon flux (15-150 keV) in 57.25 sec: 0.151579 ( -0.017501 0.017502 ) ph/cm2/s Energy fluence (15-150 keV) : 6.24477e-07 ( -8.76366e-08 8.97978e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 25.320 sec. to 82.568 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.813743 ( -1.25099 1.73077 ) Epeak [keV] : 43.4888 ( -5.72686 9.9315 ) Norm@50keV : 3.65458E-02 ( -0.0421999 0.438578 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 68.04 using 59 PHA bins. # Reduced chi-squared = 1.215 for 56 degrees of freedom # Null hypothesis probability = 1.298446e-01 Photon flux (15-150 keV) in 57.25 sec: 0.142184 ( -0.01711 0.017336 ) ph/cm2/s Energy fluence (15-150 keV) : 4.73234e-07 ( -7.45069e-08 9.16973e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 42.988 sec. to 43.988 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.62701 ( -0.718826 0.653426 ) Norm@50keV : 2.41637E-03 ( -0.00116959 0.00113479 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 61.66 using 59 PHA bins. # Reduced chi-squared = 1.082 for 57 degrees of freedom # Null hypothesis probability = 3.129613e-01 Photon flux (15-150 keV) in 1 sec: 0.313191 ( -0.13034 0.130551 ) ph/cm2/s Energy fluence (15-150 keV) : 2.25388e-08 ( -1.09147e-08 1.20042e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 42.988 sec. to 43.988 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 2.40812 ( -4.84022 -2.93031 ) Epeak [keV] : 38.4758 ( -10.3644 7188.31 ) Norm@50keV : 0.911878 ( -0.872546 244751 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.42 using 59 PHA bins. # Reduced chi-squared = 1.061 for 56 degrees of freedom # Null hypothesis probability = 3.520660e-01 Photon flux (15-150 keV) in 1 sec: 0.298350 ( -0.120778 0.12442 ) ph/cm2/s Energy fluence (15-150 keV) : 1.63016e-08 ( -7.77767e-09 1.2397e-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 = -3.131250606222631E-01, IMY = -7.877021683520555E-02
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: -239.000000 25.320000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.0853 -60.5912 9.2 45.1 -166.1 0.7178 1.3 7.1 Cen X-3 186.5341 -62.6808 3.3 40.9 -176.2 1.5675 3.5 6.3 GX 301-2 244.9917 -15.6517 0.6 33.0 66.6 11.5294 20.4 1.0 Sco X-1 255.9023 -37.7703 6.2 39.8 106.3 2.0723 1.9 6.0 4U 1700-377 256.3619 -36.3512 4.1 40.0 104.1 3.3142 2.8 5.6 GX 349+2 249.7373 -36.0336 2.4 34.7 104.4 3.3166 4.8 ------ UNKNOWN 228.9161 19.5369 2.8 47.9 9.6 2.5138 4.2 ------ UNKNOWN 207.3685 -50.4786 2.8 25.5 172.4 1.2402 4.1 ------ UNKNOWN 215.1029 31.7577 3.2 57.1 -9.2 4.4782 3.6 ------ UNKNOWN 211.8489 26.9679 2.4 52.2 -12.4 3.2074 4.8 ------ UNKNOWN 196.2604 26.3354 3.1 53.5 -29.9 3.8351 3.8 ------ UNKNOWN 199.7737 32.7473 4.2 58.9 -24.4 4.9292 2.7 ------ UNKNOWN 153.7929 -38.3115 2.7 49.7 -133.2 6.8308 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 25.320000 82.568000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.0607 -60.6068 3.6 45.1 -166.1 -0.4896 -3.2 7.6 Cen X-3 187.0309 -62.7006 0.0 40.8 -176.5 -0.1203 -0.8 11.1 GX 301-2 244.8607 -15.7443 11.6 32.9 66.7 -0.1999 -1.0 9.3 Sco X-1 255.8673 -37.8809 5.6 39.7 106.5 -0.7754 -2.1 6.1 4U 1700-377 256.4408 -36.3006 9.2 40.1 104.0 0.4949 1.3 7.4 GX 349+2 242.2918 -6.5211 2.8 35.1 50.0 0.7750 4.2 ------ UNKNOWN 215.0970 -62.8093 2.7 37.7 163.9 0.5918 4.2 ------ UNKNOWN 211.5443 -43.0832 0.9 17.9 165.9 1.1504 12.6 ------ UNKNOWN 212.1619 6.4367 2.3 31.6 -11.3 0.5109 5.0 ------ UNKNOWN 211.0075 33.9644 2.4 59.2 -13.3 2.6581 4.8 ------ UNKNOWN 181.7638 -22.5708 2.6 27.0 -103.8 0.5543 4.5 ------ UNKNOWN 146.4651 -48.8270 2.6 54.9 -146.5 2.1513 4.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 137.500660 963.017800 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.3907 -60.6691 5.9 30.2 -130.9 1.6536 2.0 3.5 Cen X-3 186.5833 -62.7522 4.4 24.5 -143.0 1.6684 2.7 2.3 GX 301-2 244.9852 -15.6406 0.7 39.5 65.7 37.3106 15.6 0.3 Sco X-1 255.8765 -37.9750 7.5 33.7 105.9 -2.2278 -1.5 9.4 4U 1700-377 256.4279 -36.4305 3.5 34.7 103.7 5.1486 3.3 0.6 GX 349+2 264.5933 -44.5447 14.6 37.6 120.3 1.3416 0.8 8.6 4U 1735-44 262.9892 -33.8320 18.4 40.7 103.9 1.7216 0.6 0.2 GX 354-0 215.3033 -62.6651 2.0 19.7 -175.9 3.3972 5.6 ------ UNKNOWN 171.1480 -18.2131 3.1 42.1 -57.5 8.0568 3.8 ------ UNKNOWN 162.5993 -29.3648 3.5 41.2 -78.0 12.7023 3.3 ------ UNKNOWN 162.5272 -28.9662 3.2 41.4 -77.5 14.6639 3.9 ------ UNKNOWN