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 Oct 19 18:47:35 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger852553
======================================================================
Trigger: 00852553 Segment: 000
BAT Trigger Time: 555539349.504 [s; MET]
Trigger Stop: 555539350.528 [s; MET]
UTC: 2018-08-09T20:28:48.102240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 299.71241182161 Dec: -15.3020410499128 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 20.89
Image Trigger?: NO
Rate S/N Ratio: 69.8140387028282 [ if not an image trigger ]
Image S/N Ratio: 20.89
Analysis Position: [ source = BAT ]
RA: 299.71241182161 Dec: -15.3020410499128 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 299.711804743507 Dec: -15.2927685976229 [deg; J2000]
{ 19h 58m 50.8s , -15d 17' 34.0" }
+/- 0.56225299484388 [arcmin] (estimated 90% radius based on SNR)
+/- 0.133240301652705 [arcmin] (formal 1-sigma fit error)
SNR: 69.2402612765424
Angular difference between the analysis and refined position is 0.557455 arcmin
Partial Coding Fraction: 0.6328125 [ including projection effects ]
Duration
T90: 233.243999958038 +/- 1.12445540263143
Measured from: 3.62800002098083
to: 236.871999979019 [s; relative to TRIGTIME]
T50: 37.595999956131 +/- 1.16756849842931
Measured from: 20.1759999990463
to: 57.7719999551773 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 35.0960000753403
to: 36.0960000753403 [s; relative to TRIGTIME]
Total Fluence
Measured from: -36.0799999237061
to: 302.308000087738 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 23.428057 38.318789 35.257398 10.272070
0.157600 0.172922 0.161166 0.122978 [error]
Peak 0.594344 1.156054 1.204186 0.402962
0.016147 0.021153 0.022643 0.016796 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 338.388 -36.080 302.308
T90 233.244 3.628 236.872
T50 37.596 20.176 57.772
Peak 1.000 35.096 36.096
====== 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 -1.240 -0.021 0.021 - - - 2.13e-02 -2.71e-04 2.71e-04 35.420 57
CPL -1.105 -0.086 0.088 449.104 -147.573 644.476 2.39e-02 -1.64e-03 1.80e-03 28.250 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 -1.002 -0.041 0.041 - - - 2.24e-01 -5.11e-03 5.10e-03 43.070 57
CPL -0.793 -0.160 0.167 344.914 -125.556 831.736 2.75e-01 -3.85e-02 4.75e-02 38.130 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 7.23e-06 1.56e-05 2.64e-05 1.03e-04 7.24e-05 1.52e-04 erg/cm2
90%_error_low -2.01e-07 -2.65e-07 -2.93e-07 -2.61e-06 -7.99e-07 -2.61e-06 erg/cm2
90%_error_hi 2.04e-07 2.64e-07 2.93e-07 2.65e-06 7.98e-07 2.65e-06 erg/cm2
Peak flux PL 2.64e-03 3.26e-02 3.77e-01 3.28e+01 1.22e+00 3.20e+01 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 6.87e-06 1.55e-05 2.68e-05 9.04e-05 7.22e-05 1.40e-04 erg/cm2
90%_error_low -2.92e-07 -2.69e-07 -4.07e-07 -6.91e-06 -8.07e-07 -6.88e-06 erg/cm2
90%_error_hi 2.98e-07 2.69e-07 4.09e-07 7.62e-06 8.09e-07 7.59e-06 erg/cm2
Peak flux CPL 5.39e+00 7.82e+00 7.96e+00 1.14e+01 2.55e+01 3.26e+01 ph/cm2/s
90%_error_low -3.67e-01 -2.34e-01 -2.41e-01 -1.63e+00 -6.31e-01 -1.77e+00 ph/cm2/s
90%_error_hi 3.75e-01 2.35e-01 2.42e-01 1.96e+00 6.32e-01 2.07e+00 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 299.7118 -15.2928 0.0028 21.6894 100.2788 17.4390250 69.240 TRIG_00852553 Foreground time interval of the image: -36.080 12.197 (delta_t = 48.277 [sec]) Background time interval of the image: -239.504 -36.080 (delta_t = 203.424 [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 -36.080 sec. to 302.308 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.23993 ( -0.0207847 0.0208776 ) Norm@50keV : 2.13272E-02 ( -0.000271273 0.000270639 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 35.42 using 59 PHA bins. # Reduced chi-squared = 0.6213 for 57 degrees of freedom # Null hypothesis probability = 9.889731e-01 Photon flux (15-150 keV) in 338.4 sec: 2.51838 ( -0.03679 0.03691 ) ph/cm2/s Energy fluence (15-150 keV) : 7.24305e-05 ( -7.99568e-07 7.98076e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -36.080 sec. to 302.308 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.10491 ( -0.0859186 0.0875752 ) Epeak [keV] : 449.104 ( -147.568 644.478 ) Norm@50keV : 2.39150E-02 ( -0.0016394 0.00180231 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 28.25 using 59 PHA bins. # Reduced chi-squared = 0.5045 for 56 degrees of freedom # Null hypothesis probability = 9.992751e-01 Photon flux (15-150 keV) in 338.4 sec: 1.46388 ( ) ph/cm2/s Energy fluence (15-150 keV) : 7.22322e-05 ( -8.07138e-07 8.09456e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 35.096 sec. to 36.096 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.00168 ( -0.0409705 0.0411196 ) Norm@50keV : 0.224092 ( -0.00510883 0.00510409 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 43.07 using 59 PHA bins. # Reduced chi-squared = 0.7557 for 57 degrees of freedom # Null hypothesis probability = 9.138772e-01 Photon flux (15-150 keV) in 1 sec: 1.21964 ( ) ph/cm2/s Energy fluence (15-150 keV) : 2.42203e-06 ( -5.93767e-08 5.94455e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 35.096 sec. to 36.096 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.793032 ( -0.160094 0.166757 ) Epeak [keV] : 344.914 ( -125.556 831.738 ) Norm@50keV : 0.275150 ( -0.0384653 0.0475488 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 38.13 using 59 PHA bins. # Reduced chi-squared = 0.6808 for 56 degrees of freedom # Null hypothesis probability = 9.676332e-01 Photon flux (15-150 keV) in 1 sec: 25.5400 ( -0.6308 0.6316 ) ph/cm2/s Energy fluence (15-150 keV) : 2.40077e-06 ( -6.21482e-08 6.20348e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 233.244 sec. Hardness ratio (energy fluence ratio) = 1.69359647659
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.2802173e-05 S(50-150 keV) = 4.962791e-05
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 = -7.097095438667057E-02, IMY = -3.913512946175454E-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: -239.504000 -36.080000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9879 -15.6495 0.6 31.2 -91.1 9.3691 20.0 0.7 Sco X-1 254.4632 35.3488 105.8 54.3 -17.6 0.0796 0.1 0.5 Her X-1 255.9723 -37.8286 1.0 30.0 -139.7 3.8681 12.0 1.2 4U 1700-377 256.4577 -36.3900 4.1 28.7 -138.2 0.8330 2.8 2.3 GX 349+2 263.1702 -24.6877 5.0 16.7 -124.4 0.5648 2.3 9.4 GX 1+4 264.9320 -44.5424 165.7 31.8 -157.9 -0.0213 -0.1 9.8 4U 1735-44 268.4232 -1.2986 8.1 15.8 -29.0 -0.3391 -1.4 9.8 SW J1753.5-0127 270.2912 -25.0504 3.1 12.4 -143.9 0.8357 3.7 1.8 GX 5-1 270.4290 -25.7388 5.0 12.9 -146.1 0.5368 2.4 6.8 GRS 1758-258 273.9491 -14.1909 9.3 3.2 -79.6 0.3018 1.2 9.8 GX 17+2 275.7712 -30.3127 4.5 15.9 -170.0 0.5775 2.6 8.6 H1820-303 285.2161 -25.0361 10.6 12.9 151.2 0.2547 1.1 12.0 HT1900.1-2455 288.8103 10.9476 1.8 27.9 30.1 1.8210 6.3 0.7 GRS 1915+105 262.8199 -33.8985 6.0 23.4 -143.2 -0.4582 -1.9 9.3 GX 354-0 312.7842 -50.5517 3.7 46.0 154.5 2.2483 3.1 ------ UNKNOWN 247.3741 37.7541 2.1 59.3 -22.0 8.5558 5.5 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -36.080000 12.196600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.1327 -15.6897 18.8 31.0 -91.1 -0.2204 -0.6 9.3 Sco X-1 254.4308 35.2419 6.0 54.3 -17.7 -1.1447 -1.9 6.2 Her X-1 255.9764 -37.7429 8.6 29.9 -139.6 0.4059 1.3 6.1 4U 1700-377 256.5482 -36.5221 78.7 28.8 -138.5 -0.0422 -0.1 8.1 GX 349+2 262.8503 -24.8892 0.0 17.1 -124.4 0.2274 1.0 12.2 GX 1+4 264.8891 -44.4101 6.6 31.7 -157.8 0.3994 1.7 6.7 4U 1735-44 268.2181 -1.3787 13.7 15.9 -29.8 -0.1678 -0.8 10.0 SW J1753.5-0127 270.4369 -24.9247 0.0 12.2 -144.1 -0.1193 -0.6 12.4 GX 5-1 270.1491 -25.8971 0.0 13.2 -145.5 0.3436 1.7 12.4 GRS 1758-258 273.8636 -14.1974 0.0 3.3 -79.9 0.1835 1.0 12.7 GX 17+2 275.9068 -30.3563 96.8 15.9 -170.4 -0.0242 -0.1 1.1 H1820-303 285.0392 -24.8460 6.2 12.7 151.3 0.3676 1.9 4.5 HT1900.1-2455 288.8195 11.0925 6.5 28.0 30.0 -0.4349 -1.8 8.9 GRS 1915+105 263.1575 -33.7535 17.4 23.1 -143.6 0.1464 0.7 9.7 GX 354-0 312.4939 -45.3274 3.0 42.8 148.6 1.9554 3.8 ------ UNKNOWN 301.6222 -18.2001 2.7 23.6 107.6 1.1826 4.3 ------ UNKNOWN 299.7118 -15.2928 0.2 21.7 100.3 17.4393 69.3 ------ UNKNOWN 288.1732 36.4268 2.8 52.0 16.4 3.1290 4.1 ------ UNKNOWN 271.3304 -16.7727 2.6 6.2 -107.1 0.8664 4.5 ------ UNKNOWN 265.0159 -42.3705 2.9 29.8 -156.3 0.8696 4.1 ------ UNKNOWN 234.5257 -19.5784 3.4 41.1 -98.0 2.8817 3.5 ------ UNKNOWN UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 59.796630 718.579000 720.496000 962.533900 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 255.9794 -37.8530 1.7 44.6 -132.6 15.1702 6.9 0.6 4U 1700-377 256.3252 -36.5155 23.2 43.9 -130.9 0.9842 0.5 7.7 GX 349+2 262.8466 -24.7457 18.0 35.8 -114.9 -0.9958 -0.6 8.9 GX 1+4 264.6376 -44.2484 8.5 41.4 -145.2 -2.0235 -1.4 12.9 4U 1735-44 268.3829 -1.3885 33.3 33.9 -72.4 0.5463 0.3 3.9 SW J1753.5-0127 270.2226 -24.9987 4.3 29.2 -117.7 2.9398 2.7 5.9 GX 5-1 270.2491 -25.8701 11.8 29.4 -119.4 1.0528 1.0 8.1 GRS 1758-258 273.8557 -13.9989 5.8 25.0 -94.0 2.0674 2.0 9.0 GX 17+2 275.8965 -30.3944 4.3 26.5 -132.4 2.4271 2.7 2.2 H1820-303 284.9640 -24.7605 7.3 16.8 -130.3 1.1261 1.6 10.4 HT1900.1-2455 288.8024 10.9172 1.6 28.3 -26.6 6.3821 7.3 1.7 GRS 1915+105 299.7069 35.1929 4.3 50.5 -3.6 4.2406 2.7 5.7 Cyg X-1 308.1745 40.9556 7.2 56.8 4.0 8.3734 1.6 2.9 Cyg X-3 263.1396 -33.8069 6.4 37.8 -129.7 2.7170 1.8 7.7 GX 354-0 299.7075 -15.3000 0.3 0.0 135.0 29.8043 35.0 ------ UNKNOWN 278.8092 -14.8486 2.5 20.2 -95.1 4.0769 4.7 ------ UNKNOWN 269.7236 8.6274 2.2 38.1 -56.7 8.4848 5.3 ------ UNKNOWN