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: Mon Aug 6 18:48:18 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger844615
======================================================================
Trigger: 00844615 Segment: 000
BAT Trigger Time: 551694098.112 [s; MET]
Trigger Stop: 551694099.136 [s; MET]
UTC: 2018-06-26T08:21:16.945520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 243.567509280255 Dec: 14.7644605261108 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.71
Image Trigger?: NO
Rate S/N Ratio: 15.9687194226713 [ if not an image trigger ]
Image S/N Ratio: 11.71
Analysis Position: [ source = BAT ]
RA: 243.567509280255 Dec: 14.7644605261108 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 243.569906251372 Dec: 14.7594853400366 [deg; J2000]
{ 16h 14m 16.8s , +14d 45' 34.1" }
+/- 0.779561612786586 [arcmin] (estimated 90% radius based on SNR)
+/- 0.237169039119451 [arcmin] (formal 1-sigma fit error)
SNR: 43.4127946212395
Angular difference between the analysis and refined position is 0.329317 arcmin
Partial Coding Fraction: 0.3554688 [ including projection effects ]
Duration
T90: 30.1039998531342 +/- 1.41138792155805
Measured from: -6.67999994754791
to: 23.4239999055862 [s; relative to TRIGTIME]
T50: 13.6999999284744 +/- 0.758609192122054
Measured from: -1.95200002193451
to: 11.7479999065399 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -3.69200003147125
to: -2.69200003147125 [s; relative to TRIGTIME]
Total Fluence
Measured from: -10.0080000162125
to: 25.5880000591278 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.813452 3.351926 1.819315 0.326475
0.082892 0.081816 0.068545 0.053942 [error]
Peak 0.118221 0.202063 0.122457 0.024401
0.014863 0.015864 0.014020 0.009825 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 35.596 -10.008 25.588
T90 30.104 -6.680 23.424
T50 13.700 -1.952 11.748
Peak 1.000 -3.692 -2.692
====== 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 -2.006 -0.064 0.064 - - - 1.48e-02 -5.23e-04 5.21e-04 46.020 57
CPL -1.657 -0.259 0.276 47.895 -14.059 13.117 2.23e-02 -5.68e-03 8.31e-03 40.620 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 -1.736 -0.159 0.154 - - - 3.03e-02 -3.18e-03 3.15e-03 59.990 57
CPL -0.051 -0.835 1.033 55.856 -7.262 12.150 2.27e-01 -1.41e-01 5.43e-01 45.990 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 1.09e-06 1.47e-06 1.46e-06 2.63e-06 4.87e-06 6.64e-06 erg/cm2
90%_error_low -6.25e-08 -5.03e-08 -6.98e-08 -2.59e-07 -1.66e-07 -3.18e-07 erg/cm2
90%_error_hi 6.38e-08 5.03e-08 6.98e-08 2.77e-07 1.66e-07 3.29e-07 erg/cm2
Peak flux PL 1.57e+00 1.37e+00 8.23e-01 7.45e-01 4.08e+00 4.50e+00 ph/cm2/s
90%_error_low -2.31e-01 -1.38e-01 -1.07e-01 -1.71e-01 -4.09e-01 -4.43e-01 ph/cm2/s
90%_error_hi 2.40e-01 1.38e-01 1.07e-01 1.97e-01 4.09e-01 4.43e-01 ph/cm2/s
Fluence CPL 1.02e-06 1.51e-06 1.48e-06 1.60e-06 4.73e-06 5.61e-06 erg/cm2
90%_error_low -7.79e-08 -5.90e-08 -7.37e-08 -4.64e-07 -1.93e-07 -5.11e-07 erg/cm2
90%_error_hi 7.93e-08 5.96e-08 7.42e-08 6.93e-07 1.92e-07 7.18e-07 erg/cm2
Peak flux CPL 1.56e+00 1.17e+00 6.11e-01 5.26e-01 3.56e+00 3.87e+00 ph/cm2/s
90%_error_low -3.03e-01 -1.76e-01 -1.20e-01 -8.74e-02 -6.02e-01 -7.54e-01 ph/cm2/s
90%_error_hi 3.04e-01 1.69e-01 1.03e-01 7.85e-02 4.86e-01 4.49e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 243.5699 14.7595 0.0045 41.4315 167.1325 6.6316201 43.413 TRIG_00844615 Foreground time interval of the image: -10.008 11.389 (delta_t = 21.397 [sec]) Background time interval of the image: -188.211 -10.008 (delta_t = 178.203 [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 -10.008 sec. to 25.588 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.00611 ( -0.0641999 0.0635331 ) Norm@50keV : 1.48188E-02 ( -0.000522661 0.000520661 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.02 using 59 PHA bins. # Reduced chi-squared = 0.8073 for 57 degrees of freedom # Null hypothesis probability = 8.507754e-01 Photon flux (15-150 keV) in 35.6 sec: 2.22925 ( -0.08226 0.08264 ) ph/cm2/s Energy fluence (15-150 keV) : 4.86745e-06 ( -1.65799e-07 1.66054e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.008 sec. to 25.588 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.65656 ( -0.259158 0.276332 ) Epeak [keV] : 47.8950 ( -14.0589 13.1166 ) Norm@50keV : 2.22799E-02 ( -0.00568209 0.00830965 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 40.62 using 59 PHA bins. # Reduced chi-squared = 0.7253 for 56 degrees of freedom # Null hypothesis probability = 9.392158e-01 Photon flux (15-150 keV) in 35.6 sec: 2.17119 ( -0.09169 0.09215 ) ph/cm2/s Energy fluence (15-150 keV) : 4.73306e-06 ( -1.93117e-07 1.92441e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -3.692 sec. to -2.692 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.73628 ( -0.158793 0.153798 ) Norm@50keV : 3.03140E-02 ( -0.00318023 0.00315425 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 59.99 using 59 PHA bins. # Reduced chi-squared = 1.053 for 57 degrees of freedom # Null hypothesis probability = 3.677137e-01 Photon flux (15-150 keV) in 1 sec: 4.07858 ( -0.40854 0.40913 ) ph/cm2/s Energy fluence (15-150 keV) : 2.79995e-07 ( -3.01791e-08 3.03823e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.692 sec. to -2.692 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.0507957 ( -0.834946 1.03314 ) Epeak [keV] : 55.8559 ( -7.26215 12.1504 ) Norm@50keV : 0.226653 ( -0.14147 0.543149 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 45.99 using 59 PHA bins. # Reduced chi-squared = 0.8213 for 56 degrees of freedom # Null hypothesis probability = 8.275885e-01 Photon flux (15-150 keV) in 1 sec: 3.56341 ( -0.60159 0.48567 ) ph/cm2/s Energy fluence (15-150 keV) : 2.59406e-07 ( -3.12247e-08 3.19608e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 30.104 sec. Hardness ratio (energy fluence ratio) = 0.995818259857
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.553635e-06 S(50-150 keV) = 2.31381e-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 = -8.604306448548975E-01, IMY = -1.965517898628813E-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: -188.211400 -10.008000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9716 -15.6403 0.6 36.3 118.3 8.8753 18.2 0.5 Sco X-1 254.4733 35.3926 6.3 47.1 -160.9 -0.8097 -1.8 3.1 Her X-1 256.0361 -37.6722 22.9 39.5 78.9 0.4559 0.5 10.6 4U 1700-377 256.3891 -36.4307 12.0 38.4 79.9 -0.7484 -1.0 2.3 GX 349+2 263.1653 -24.7466 10.7 25.8 86.2 0.3122 1.1 8.5 GX 1+4 268.3573 -1.2413 0.0 12.5 155.0 0.2924 1.4 12.7 SW J1753.5-0127 270.3080 -25.0542 2.6 22.3 72.7 1.1375 4.5 2.0 GX 5-1 270.2362 -25.6943 4.8 22.9 72.1 0.6493 2.4 4.6 GRS 1758-258 274.1251 -14.0274 6.1 10.9 81.7 0.4088 1.9 7.0 GX 17+2 275.8445 -30.4994 4.2 25.9 57.0 0.8159 2.8 9.0 H1820-303 285.0169 -24.7217 0.0 20.3 35.8 -0.4018 -1.8 12.0 HT1900.1-2455 288.8238 10.9430 1.5 18.0 -103.9 1.7614 7.4 1.5 GRS 1915+105 263.0811 -33.9369 8.1 33.1 74.9 0.6219 1.4 7.7 GX 354-0 294.6157 -53.7235 2.6 50.1 37.2 5.0805 4.4 ------ UNKNOWN 310.8817 -48.5769 2.4 50.8 22.4 3.7250 4.9 ------ UNKNOWN 247.4534 3.7002 2.2 34.0 152.3 1.8575 5.3 ------ UNKNOWN 275.0945 7.1843 0.3 13.2 -155.2 9.4461 44.6 ------ UNKNOWN 281.3523 43.5840 2.7 48.5 -130.9 4.7956 4.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -10.008000 11.388600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.1093 -15.6939 11.6 36.2 118.2 0.1916 1.0 8.2 Sco X-1 254.5167 35.1968 6.4 46.9 -161.0 -0.2978 -1.8 9.2 Her X-1 255.7344 -37.8428 0.0 39.8 79.0 0.5875 1.9 11.9 4U 1700-377 256.6406 -36.4486 14.4 38.3 79.6 0.2006 0.8 10.0 GX 349+2 263.0786 -24.5951 6.3 25.7 86.6 0.1873 1.8 9.8 GX 1+4 268.2710 -1.5634 5.8 12.5 153.5 0.1472 2.0 8.8 SW J1753.5-0127 270.2898 -24.8792 0.0 22.1 73.0 0.0486 0.5 12.0 GX 5-1 270.2993 -25.9393 6.7 23.1 71.7 0.1634 1.7 11.8 GRS 1758-258 274.0439 -13.8663 5.0 10.9 82.5 -0.1843 -2.3 10.4 GX 17+2 276.0852 -30.4278 7.1 25.8 56.6 0.1690 1.6 9.1 H1820-303 285.2694 -24.9063 0.0 20.5 35.3 -0.1723 -2.1 12.7 HT1900.1-2455 288.6255 10.9651 10.5 17.9 -104.5 0.0957 1.1 10.3 GRS 1915+105 262.8160 -33.7881 8.8 33.1 75.4 0.2017 1.3 9.1 GX 354-0 243.5699 14.7595 0.3 41.4 167.1 6.6316 43.4 ------ UNKNOWN 253.2692 22.1060 2.6 37.9 -175.2 0.4832 4.4 ------ UNKNOWN 290.5766 26.7785 2.5 33.2 -115.0 0.4952 4.5 ------ UNKNOWN 294.1308 33.7241 2.2 40.8 -114.2 1.0296 5.3 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 102.388600 962.958000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9906 -15.6440 0.4 30.5 127.1 34.6579 25.9 0.7 Sco X-1 254.5749 35.3738 6.3 22.8 -26.7 1.5406 1.8 6.0 Her X-1 268.3125 -1.6069 9.4 29.4 71.5 1.5797 1.2 9.8 SW J1753.5-0127 288.7322 10.9972 4.8 44.1 39.1 5.0388 2.4 5.0 GRS 1915+105 299.6121 35.3018 3.6 53.9 6.5 8.3159 3.2 6.1 Cyg X-1 275.0904 7.1856 0.3 31.8 50.1 46.0372 33.4 ------ UNKNOWN 278.8734 12.4769 2.3 34.3 39.1 6.8818 5.0 ------ UNKNOWN 289.0144 20.2850 2.2 43.5 25.6 8.7449 5.3 ------ UNKNOWN 290.4878 35.5219 2.5 46.7 4.5 7.1696 4.6 ------ UNKNOWN 225.3756 -3.2039 2.5 25.5 176.2 3.9697 4.7 ------ UNKNOWN 209.9769 -15.9771 2.7 45.3 178.2 7.0292 4.3 ------ UNKNOWN 190.4013 -5.3471 4.2 56.4 -157.2 16.5317 2.8 ------ UNKNOWN 191.9875 14.9508 3.8 49.8 -133.1 18.2969 3.0 ------ UNKNOWN