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: Sat Jan 20 05:03:37 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger785510
======================================================================
Trigger: 00785510 Segment: 000
BAT Trigger Time: 531328849.536 [s; MET]
Trigger Stop: 531328857.728 [s; MET]
UTC: 2017-11-02T15:20:29.598440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 288.103089791342 Dec: 22.4378985024187 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.05
Image Trigger?: NO
Rate S/N Ratio: 9.32737905308882 [ if not an image trigger ]
Image S/N Ratio: 7.05
Analysis Position: [ source = BAT ]
RA: 288.103089791342 Dec: 22.4378985024187 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 288.104882338437 Dec: 22.4391664111014 [deg; J2000]
{ 19h 12m 25.2s , +22d 26' 21.0" }
+/- 2.10145526362887 [arcmin] (estimated 90% radius based on SNR)
+/- 1.16856294430027 [arcmin] (formal 1-sigma fit error)
SNR: 10.5287135430714
Angular difference between the analysis and refined position is 0.125179 arcmin
Partial Coding Fraction: 0.2226562 [ including projection effects ]
Duration
T90: 18.8800000548363 +/- 3.9151071896423
Measured from: -4.8400000333786
to: 14.0400000214577 [s; relative to TRIGTIME]
T50: 10.1600000858307 +/- 3.8436315953939
Measured from: -0.696000039577484
to: 9.4640000462532 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.5
to: 4.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.36800003051758
to: 15.4160000085831 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.252619 0.388716 0.481830 0.114084
0.064715 0.064748 0.056863 0.051362 [error]
Peak 0.027224 0.055437 0.045027 0.028275
0.015220 0.014905 0.013576 0.012542 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 20.784 -5.368 15.416
T90 18.880 -4.840 14.040
T50 10.160 -0.696 9.464
Peak 1.000 3.500 4.500
====== 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 -1.154 -0.242 0.252 - - - 4.41e-03 -6.33e-04 6.30e-04 66.560 57
CPL -0.171 -1.061 1.516 105.140 -31.843 -105.140 1.21e-02 -1.21e-02 3.98e-02 64.260 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 -1.541 -0.579 0.569 - - - 9.26e-03 -3.03e-03 2.97e-03 45.560 57
CPL -0.913 -1.274 3.597 85.851 -85.851 -85.851 1.92e-02 -1.92e-02 9.30e-01 45.320 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 8.46e-08 1.92e-07 3.46e-07 1.47e-06 9.41e-07 2.09e-06 erg/cm2
90%_error_low -2.31e-08 -3.36e-08 -5.47e-08 -4.60e-07 -1.40e-07 -4.97e-07 erg/cm2
90%_error_hi 2.55e-08 3.30e-08 5.41e-08 5.95e-07 1.41e-07 6.09e-07 erg/cm2
Peak flux PL 3.96e-01 3.89e-01 2.68e-01 2.89e-01 1.17e+00 1.34e+00 ph/cm2/s
90%_error_low -1.97e-01 -1.34e-01 -1.08e-01 -1.82e-01 -3.76e-01 -4.22e-01 ph/cm2/s
90%_error_hi 2.30e-01 1.30e-01 1.07e-01 3.12e-01 3.79e-01 4.26e-01 ph/cm2/s
Fluence CPL 6.59e-08 2.03e-07 3.77e-07 5.05e-07 8.92e-07 1.15e-06 erg/cm2
90%_error_low -2.93e-08 -3.82e-08 -6.59e-08 -3.22e-07 -1.55e-07 -3.53e-07 erg/cm2
90%_error_hi 3.23e-08 3.91e-08 6.85e-08 1.12e-06 1.54e-07 1.14e-06 erg/cm2
Peak flux CPL 3.53e-01 4.11e-01 2.79e-01 1.48e-01 1.13e+00 1.19e+00 ph/cm2/s
90%_error_low -2.49e-01 -1.49e-01 -1.18e-01 -1.48e-01 -4.05e-01 -4.58e-01 ph/cm2/s
90%_error_hi 2.62e-01 1.64e-01 1.26e-01 2.07e-01 3.97e-01 4.40e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 288.1049 22.4392 0.0183 37.0280 59.3346 1.3675421 10.529 TRIG_00785510 Foreground time interval of the image: -5.368 15.416 (delta_t = 20.784 [sec]) Background time interval of the image: -182.035 -5.368 (delta_t = 176.667 [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 -5.368 sec. to 15.416 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.15365 ( -0.242135 0.251762 ) Norm@50keV : 4.40534E-03 ( -0.000632526 0.000630181 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.56 using 59 PHA bins. # Reduced chi-squared = 1.168 for 57 degrees of freedom # Null hypothesis probability = 1.810181e-01 Photon flux (15-150 keV) in 20.78 sec: 0.513979 ( -0.077253 0.077864 ) ph/cm2/s Energy fluence (15-150 keV) : 9.41446e-07 ( -1.40422e-07 1.41272e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.368 sec. to 15.416 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.170558 ( -1.06463 1.5133 ) Epeak [keV] : 105.140 ( -31.6702 -104.967 ) Norm@50keV : 1.20823E-02 ( -0.0121288 0.0397462 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.26 using 59 PHA bins. # Reduced chi-squared = 1.147 for 56 degrees of freedom # Null hypothesis probability = 2.097378e-01 Photon flux (15-150 keV) in 20.78 sec: 0.488626 ( -0.083261 0.083144 ) ph/cm2/s Energy fluence (15-150 keV) : 8.92042e-07 ( -1.55164e-07 1.53871e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 3.500 sec. to 4.500 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.54097 ( -0.579311 0.568855 ) Norm@50keV : 9.25596E-03 ( -0.00302745 0.00296515 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.56 using 59 PHA bins. # Reduced chi-squared = 0.7993 for 57 degrees of freedom # Null hypothesis probability = 8.619633e-01 Photon flux (15-150 keV) in 1 sec: 1.16874 ( -0.375692 0.3785 ) ph/cm2/s Energy fluence (15-150 keV) : 8.7263e-08 ( -2.9961e-08 3.09159e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.500 sec. to 4.500 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.912544 ( -1.27385 3.59703 ) Epeak [keV] : 85.8513 ( -85.85 -85.85 ) Norm@50keV : 1.92365E-02 ( -0.0192371 0.930107 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.32 using 59 PHA bins. # Reduced chi-squared = 0.8093 for 56 degrees of freedom # Null hypothesis probability = 8.454751e-01 Photon flux (15-150 keV) in 1 sec: 1.13268 ( -0.405042 0.39749 ) ph/cm2/s Energy fluence (15-150 keV) : 8.30462e-08 ( -3.19169e-08 3.36912e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 18.88 sec. Hardness ratio (energy fluence ratio) = 1.79795939383
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.7686163e-07 S(50-150 keV) = 6.645982e-07
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 = 3.847212005876110E-01, IMY = -6.488364265045372E-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: -182.035410 -5.368000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9901 -15.6410 0.3 22.3 -87.8 8.7011 34.2 0.6 Sco X-1 254.3019 35.3413 5.0 44.7 10.6 -0.8812 -2.3 7.6 Her X-1 255.9445 -37.9124 3.3 31.5 -139.5 0.9215 3.5 4.6 4U 1700-377 256.4488 -36.5680 5.2 30.1 -139.4 -0.5587 -2.2 8.7 GX 349+2 262.9900 -24.7346 2.7 17.2 -145.0 0.8363 4.3 1.2 GX 1+4 264.7446 -44.5321 7.7 36.7 -153.4 -0.4528 -1.5 4.9 4U 1735-44 268.3754 -1.4641 48.3 6.7 42.3 -0.0476 -0.2 0.8 SW J1753.5-0127 270.0701 -25.0049 4.7 17.5 -166.6 0.4594 2.4 12.5 GX 5-1 270.2978 -25.8283 4.2 18.4 -166.7 0.5232 2.8 5.1 GRS 1758-258 274.0512 -13.9681 5.6 9.7 154.3 0.4105 2.1 4.9 GX 17+2 276.0183 -30.3240 3.3 24.2 -176.0 0.7586 3.5 5.5 H1820-303 284.9527 -25.0712 7.9 24.7 161.0 -0.3347 -1.5 10.1 HT1900.1-2455 288.8014 10.9784 3.1 29.2 74.9 1.2550 3.7 2.0 GRS 1915+105 263.1182 -33.7723 36.8 26.1 -149.2 0.0731 0.3 7.4 GX 354-0 307.3261 -3.4660 2.8 41.0 110.9 3.4020 4.0 ------ UNKNOWN 258.1007 30.9227 2.8 39.6 13.5 1.2128 4.1 ------ UNKNOWN 234.1222 -43.1627 2.1 45.2 -122.1 4.7531 5.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -5.368000 15.416000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.1098 -15.6977 4.1 22.2 -88.0 -0.2051 -2.8 8.3 Sco X-1 254.4264 35.3476 15.9 44.6 10.8 0.0780 0.7 1.6 Her X-1 256.1557 -37.9526 5.2 31.5 -139.8 -0.1744 -2.2 10.3 4U 1700-377 256.4465 -36.4435 18.6 30.0 -139.3 0.0476 0.6 1.3 GX 349+2 262.7921 -24.6671 0.0 17.2 -144.3 0.0927 1.6 12.7 GX 1+4 264.4720 -44.3641 0.0 36.6 -153.1 -0.1365 -1.6 12.7 4U 1735-44 268.1689 -1.3793 0.0 6.7 40.4 0.0580 1.0 12.7 SW J1753.5-0127 270.2242 -24.9393 23.8 17.5 -167.1 -0.0270 -0.5 9.0 GX 5-1 270.3208 -25.5699 5.9 18.1 -166.9 0.1076 1.9 10.4 GRS 1758-258 273.8654 -13.9722 6.6 9.6 155.0 0.1038 1.8 9.0 GX 17+2 275.8354 -30.3349 6.7 24.2 -175.7 0.1085 1.7 5.0 H1820-303 284.8304 -24.8646 4.1 24.5 160.8 0.1780 2.8 11.7 HT1900.1-2455 288.5985 11.0092 0.0 29.1 74.5 -0.0183 -0.2 12.4 GRS 1915+105 262.8068 -33.8417 15.7 26.2 -148.7 -0.0481 -0.7 9.1 GX 354-0 288.1049 22.4392 1.1 37.0 59.3 1.3682 10.5 ------ UNKNOWN 277.1990 -5.3365 2.2 11.1 102.2 0.2950 5.4 ------ UNKNOWN 279.5268 -46.4597 2.1 40.2 -169.4 0.4959 5.5 ------ UNKNOWN 231.7320 29.6788 2.7 50.1 -15.3 0.5220 4.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 107.964600 962.545500 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5300 35.4317 6.9 31.9 -36.4 -1.1565 -1.7 6.4 Her X-1 268.3153 -1.4283 11.3 30.7 -116.5 0.8999 1.0 3.5 SW J1753.5-0127 270.1375 -25.1042 11.3 50.6 -136.9 3.0611 1.0 8.1 GX 5-1 270.2101 -25.6271 6.5 51.1 -137.2 5.6420 1.8 8.6 GRS 1758-258 274.0065 -14.0698 32.7 39.0 -136.0 -0.3681 -0.4 2.0 GX 17+2 275.9340 -30.3684 7.6 54.1 -145.1 5.3929 1.5 0.5 H1820-303 284.9328 -24.9393 5.7 47.5 -154.1 -2.7873 -2.0 5.7 HT1900.1-2455 288.7900 10.9726 1.4 11.5 -161.6 4.7206 8.5 1.7 GRS 1915+105 299.5901 35.1845 2.0 16.2 57.7 3.2342 5.7 1.0 Cyg X-1 308.1272 40.9488 1.1 25.1 59.7 7.5845 10.7 0.8 Cyg X-3 325.9847 38.4321 9.2 36.1 76.9 1.8253 1.3 11.0 Cyg X-2 325.3514 61.2894 4.2 46.5 45.6 6.5011 2.7 ------ UNKNOWN 294.8354 44.5879 2.5 22.8 34.5 2.6594 4.7 ------ UNKNOWN 305.8022 -30.5131 4.1 55.6 -176.5 7.0601 2.9 ------ UNKNOWN 278.9541 -2.2290 2.7 26.2 -137.0 2.5991 4.3 ------ UNKNOWN 284.0534 -34.6714 3.7 57.2 -154.1 11.3516 3.1 ------ UNKNOWN