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 04:57:06 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger790053
======================================================================
Trigger: 00790053 Segment: 000
BAT Trigger Time: 532464700.864 [s; MET]
Trigger Stop: 532464702.912 [s; MET]
UTC: 2017-11-15T18:51:20.858340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 278.412563701263 Dec: 9.12838471438907 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.59
Image Trigger?: NO
Rate S/N Ratio: 8.83176086632785 [ if not an image trigger ]
Image S/N Ratio: 7.59
Analysis Position: [ source = BAT ]
RA: 278.412563701263 Dec: 9.12838471438907 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 278.391772564459 Dec: 9.11771088638416 [deg; J2000]
{ 18h 33m 34.0s , +09d 07' 03.8" }
+/- 1.52951440585242 [arcmin] (estimated 90% radius based on SNR)
+/- 0.67945946282575 [arcmin] (formal 1-sigma fit error)
SNR: 16.5756443668173
Angular difference between the analysis and refined position is 1.388238 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 36.7719999551773 +/- 5.18024129206609
Measured from: -6.30000001192093
to: 30.4719999432564 [s; relative to TRIGTIME]
T50: 19.6519999504089 +/- 3.96798791377569
Measured from: -1.91200000047684
to: 17.7399999499321 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -2.32400000095367
to: -1.32400000095367 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.37999999523163
to: 32.3319999575615 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.426202 0.449640 0.273522 0.062766
0.039964 0.038821 0.032961 0.028387 [error]
Peak 0.027859 0.020678 0.023122 0.006521
0.006384 0.006301 0.005567 0.004688 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 39.712 -7.380 32.332
T90 36.772 -6.300 30.472
T50 19.652 -1.912 17.740
Peak 1.000 -2.324 -1.324
====== 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 -1.722 -0.187 0.183 - - - 1.82e-03 -1.95e-04 1.91e-04 51.470 57
CPL -1.730 -0.179 0.209 9999.360 -9999.350 -9999.360 1.82e-03 -1.33e-03 1.03e-03 51.490 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 -1.781 -0.549 0.485 - - - 4.24e-03 -1.36e-03 1.25e-03 52.860 57
CPL -2.148 -0.062 1.805 58.964 N/A N/A 2.79e-03 N/A N/A 52.800 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 1.14e-07 1.83e-07 2.22e-07 5.27e-07 6.69e-07 1.05e-06 erg/cm2
90%_error_low -1.74e-08 -1.73e-08 -3.28e-08 -1.48e-07 -7.45e-08 -1.80e-07 erg/cm2
90%_error_hi 1.80e-08 1.73e-08 3.29e-08 1.84e-07 7.58e-08 2.09e-07 erg/cm2
Peak flux PL 2.29e-01 1.95e-01 1.13e-01 9.85e-02 5.80e-01 6.35e-01 ph/cm2/s
90%_error_low -8.52e-02 -4.82e-02 -4.66e-02 -6.18e-02 -1.43e-01 -1.61e-01 ph/cm2/s
90%_error_hi 9.21e-02 4.82e-02 4.67e-02 1.04e-01 1.43e-01 1.65e-01 ph/cm2/s
Fluence CPL 1.16e-07 1.80e-07 1.61e-07 5.26e-07 6.76e-07 1.04e-06 erg/cm2
90%_error_low -2.56e-08 -2.14e-08 -2.93e-08 N/A -8.11e-08 -2.75e-07 erg/cm2
90%_error_hi 2.27e-08 2.86e-08 2.66e-08 N/A 6.92e-08 1.99e-07 erg/cm2
Peak flux CPL 2.33e-01 1.94e-01 1.12e-01 1.10e-01 5.81e-01 6.37e-01 ph/cm2/s
90%_error_low -9.29e-02 -4.72e-02 N/A N/A -1.44e-01 -1.75e-01 ph/cm2/s
90%_error_hi 9.13e-02 5.41e-02 N/A N/A 1.43e-01 1.60e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 278.3918 9.1177 0.0116 12.0209 20.3832 1.1638647 16.576 TRIG_00790053 Foreground time interval of the image: -7.380 26.037 (delta_t = 33.417 [sec]) Background time interval of the image: -174.963 -7.380 (delta_t = 167.583 [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 -7.380 sec. to 32.332 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.72166 ( -0.187183 0.182758 ) Norm@50keV : 1.82355E-03 ( -0.000195283 0.000191444 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.47 using 59 PHA bins. # Reduced chi-squared = 0.9030 for 57 degrees of freedom # Null hypothesis probability = 6.817514e-01 Photon flux (15-150 keV) in 39.71 sec: 0.244060 ( -0.023238 0.023281 ) ph/cm2/s Energy fluence (15-150 keV) : 6.69483e-07 ( -7.44789e-08 7.58151e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.380 sec. to 32.332 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.7298 ( -0.179992 0.208057 ) Epeak [keV] : 9999.36 ( -9999.35 -9999.36 ) Norm@50keV : 1.81538E-03 ( -0.00133417 0.00102661 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.49 using 59 PHA bins. # Reduced chi-squared = 0.9195 for 56 degrees of freedom # Null hypothesis probability = 6.460824e-01 Photon flux (15-150 keV) in 39.71 sec: 0.244493 ( -0.023923 0.023184 ) ph/cm2/s Energy fluence (15-150 keV) : 6.75912e-07 ( -8.11406e-08 6.91629e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -2.324 sec. to -1.324 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.78118 ( -0.549419 0.485416 ) Norm@50keV : 4.23754E-03 ( -0.00135546 0.00124864 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.86 using 59 PHA bins. # Reduced chi-squared = 0.9274 for 57 degrees of freedom # Null hypothesis probability = 6.310103e-01 Photon flux (15-150 keV) in 1 sec: 0.579747 ( -0.143394 0.143431 ) ph/cm2/s Energy fluence (15-150 keV) : 3.90472e-08 ( -1.20269e-08 1.26194e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.324 sec. to -1.324 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.14799 ( -0.0617533 1.80467 ) Epeak [keV] : 58.9638 ( ) Norm@50keV : 2.79228E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 52.80 using 59 PHA bins. # Reduced chi-squared = 0.9429 for 56 degrees of freedom # Null hypothesis probability = 5.967521e-01 Photon flux (15-150 keV) in 1 sec: 0.580834 ( -0.144253 0.142724 ) ph/cm2/s Energy fluence (15-150 keV) : 3.44398e-08 ( -1.52226e-08 1.12301e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 36.772 sec. Hardness ratio (energy fluence ratio) = 1.21282986507
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.967322e-07 S(50-150 keV) = 3.727489e-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 = 1.996049371019823E-01, IMY = -7.416591476991764E-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: -174.963400 -7.380000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9886 -15.6375 1.0 38.0 -78.7 6.3671 11.4 0.6 Sco X-1 254.3963 35.3358 3.5 45.5 2.7 1.1091 3.3 3.0 Her X-1 256.0828 -37.8860 6.1 42.1 -116.3 1.3367 1.9 5.2 4U 1700-377 256.3910 -36.4294 6.6 40.9 -115.2 1.1065 1.7 2.2 GX 349+2 263.0942 -24.7524 3.9 28.2 -109.7 0.7567 3.0 4.7 GX 1+4 264.7496 -44.4537 199.5 44.3 -129.5 0.0311 0.1 0.4 4U 1735-44 268.2501 -1.3540 6.9 13.0 -51.1 -0.3075 -1.7 9.2 SW J1753.5-0127 270.4002 -25.0215 5.8 24.7 -122.4 0.4508 2.0 7.2 GX 5-1 270.5322 -25.7907 0.0 25.4 -123.4 0.5943 2.6 12.7 GRS 1758-258 273.9865 -14.0022 7.3 13.5 -114.8 0.3088 1.6 2.3 GX 17+2 275.9658 -30.3468 3.5 28.2 -136.7 0.7279 3.3 2.4 H1820-303 285.0759 -24.9991 28.0 22.7 -155.4 0.0709 0.4 5.2 HT1900.1-2455 288.8235 10.9892 4.3 15.6 62.9 0.4925 2.7 3.0 GRS 1915+105 299.4773 35.2388 3.9 41.5 56.5 1.8404 3.0 6.0 Cyg X-1 262.8564 -33.8374 7.2 35.6 -119.6 0.5324 1.6 6.6 GX 354-0
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -7.380000 26.036590 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0284 -15.6217 19.5 37.9 -78.7 -0.1299 -0.6 3.0 Sco X-1 254.4629 35.2493 4.7 45.4 2.7 -0.3244 -2.5 5.6 Her X-1 256.0167 -37.8590 5.5 42.1 -116.2 -0.6259 -2.1 1.7 4U 1700-377 256.2001 -36.3856 3.7 40.9 -115.0 -0.7960 -3.1 11.6 GX 349+2 262.8361 -24.7729 7.8 28.4 -109.3 0.1541 1.5 9.6 GX 1+4 264.7530 -44.5708 11.9 44.4 -129.5 -0.2078 -1.0 7.3 4U 1735-44 268.3114 -1.3462 92.2 12.9 -51.0 -0.0091 -0.1 7.2 SW J1753.5-0127 270.0669 -25.0466 8.3 24.9 -121.8 -0.1223 -1.4 12.0 GX 5-1 270.4968 -25.7428 8.9 25.3 -123.3 0.1165 1.3 10.5 GRS 1758-258 274.0532 -13.8345 0.0 13.3 -114.6 -0.0612 -0.8 12.4 GX 17+2 275.8449 -30.2430 12.7 28.1 -136.5 0.0833 0.9 8.5 H1820-303 285.0956 -24.8334 6.6 22.6 -155.6 -0.1293 -1.7 6.2 HT1900.1-2455 288.8728 10.8195 6.3 15.4 63.3 0.1367 1.8 8.7 GRS 1915+105 299.7376 35.2484 4.3 41.6 56.8 0.6885 2.7 7.7 Cyg X-1 262.9892 -33.9747 5.6 35.7 -119.9 0.2689 2.1 8.4 GX 354-0 278.3918 9.1177 0.7 12.0 20.4 1.1640 16.6 ------ UNKNOWN 299.0446 -28.1911 2.7 30.8 -178.2 0.3476 4.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 58.436590 962.212600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4853 35.3560 1.5 34.1 -4.9 6.2734 7.9 1.6 Her X-1 262.8424 -24.6910 4.6 37.1 -124.9 2.8040 2.5 9.7 GX 1+4 268.3182 -1.6535 0.0 14.7 -105.3 1.1267 1.7 12.4 SW J1753.5-0127 270.2349 -25.1255 4.0 35.2 -135.9 2.7418 2.9 3.9 GX 5-1 270.4082 -25.7224 2.4 35.7 -136.4 4.5431 4.9 5.8 GRS 1758-258 274.0178 -14.0760 1.8 23.6 -138.1 3.8703 6.5 2.5 GX 17+2 275.8133 -30.3144 4.5 39.5 -145.2 2.6264 2.5 6.6 H1820-303 285.0384 -24.8797 23.8 34.6 -159.4 -0.3723 -0.5 2.5 HT1900.1-2455 288.8576 11.0019 1.9 10.5 110.0 4.1913 6.2 4.9 GRS 1915+105 299.5956 35.2070 1.7 32.5 64.6 7.5967 6.7 0.4 Cyg X-1 262.8459 -33.7400 11.0 45.3 -130.5 -2.1593 -1.0 9.1 GX 354-0 310.0074 38.0467 3.8 40.5 70.7 8.8203 3.0 ------ UNKNOWN 315.0337 24.4228 3.5 38.1 93.0 6.6812 3.3 ------ UNKNOWN 293.0639 56.6528 3.3 48.9 41.9 10.9792 3.6 ------ UNKNOWN 294.2383 19.1050 4.1 18.3 86.5 1.9262 2.8 ------ UNKNOWN 233.7837 50.3665 5.6 55.2 -1.8 4.1985 2.1 ------ UNKNOWN 236.4266 31.9050 2.9 45.0 -22.1 4.1248 4.0 ------ UNKNOWN 258.2031 -12.3578 2.2 29.4 -105.4 4.7730 5.3 ------ UNKNOWN 229.2427 23.0117 2.4 49.0 -36.1 8.3093 4.9 ------ UNKNOWN