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 18:56:00 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger844015
======================================================================
Trigger: 00844015 Segment: 000
BAT Trigger Time: 551464937.536 [s; MET]
Trigger Stop: 551464938.56 [s; MET]
UTC: 2018-06-23T16:41:56.383500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 214.511433345221 Dec: -60.2943173268399 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.68
Image Trigger?: NO
Rate S/N Ratio: 21.6794833886788 [ if not an image trigger ]
Image S/N Ratio: 7.68
Analysis Position: [ source = BAT ]
RA: 214.511433345221 Dec: -60.2943173268399 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 214.528304880577 Dec: -60.2682278847358 [deg; J2000]
{ 14h 18m 06.8s , -60d 16' 05.6" }
+/- 0.869028475349914 [arcmin] (estimated 90% radius based on SNR)
+/- 0.252421402495833 [arcmin] (formal 1-sigma fit error)
SNR: 37.1717198594497
Angular difference between the analysis and refined position is 1.643841 arcmin
Partial Coding Fraction: 0.6328125 [ including projection effects ]
Duration
T90: 114.879999995232 +/- 6.81986998340227
Measured from: -37.1720000505447
to: 77.7079999446869 [s; relative to TRIGTIME]
T50: 57.9679999351501 +/- 1.19814527588882
Measured from: 4.67599999904633
to: 62.6439999341965 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 59.1080000400543
to: 60.1080000400543 [s; relative to TRIGTIME]
Total Fluence
Measured from: -61.8200000524521
to: 114.067999958992 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.807608 6.713509 5.368042 1.519563
0.101476 0.102133 0.088507 0.071203 [error]
Peak 0.173210 0.243054 0.220925 0.070395
0.008414 0.009447 0.009098 0.006202 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 175.888 -61.820 114.068
T90 114.880 -37.172 77.708
T50 57.968 4.676 62.644
Peak 1.000 59.108 60.108
====== 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 -1.442 -0.040 0.040 - - - 6.79e-03 -1.38e-04 1.38e-04 65.030 57
CPL -1.405 -0.053 0.142 859.438 -859.438 -859.438 7.05e-03 -3.54e-04 1.01e-03 65.100 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 -1.305 -0.076 0.076 - - - 4.48e-02 -1.90e-03 1.90e-03 51.180 57
CPL -1.224 -0.118 0.292 525.588 -525.588 -525.588 4.89e-02 -8.62e-03 1.76e-02 50.930 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 1.44e-06 2.75e-06 4.05e-06 1.28e-05 1.14e-05 2.10e-05 erg/cm2
90%_error_low -6.37e-08 -6.97e-08 -9.60e-08 -7.11e-07 -2.38e-07 -7.47e-07 erg/cm2
90%_error_hi 6.50e-08 6.96e-08 9.57e-08 7.41e-07 2.39e-07 7.71e-07 erg/cm2
Peak flux PL 1.53e+00 1.73e+00 1.40e+00 1.89e+00 5.35e+00 6.55e+00 ph/cm2/s
90%_error_low -1.23e-01 -8.42e-02 -7.20e-02 -2.00e-01 -2.33e-01 -2.89e-01 ph/cm2/s
90%_error_hi 1.26e-01 8.38e-02 7.16e-02 2.14e-01 2.34e-01 2.90e-01 ph/cm2/s
Fluence CPL 1.44e-06 2.77e-06 4.06e-06 1.24e-05 1.14e-05 2.05e-05 erg/cm2
90%_error_low -1.11e-07 -8.19e-08 -1.05e-07 -2.17e-06 -2.87e-07 -2.01e-06 erg/cm2
90%_error_hi 3.78e-08 6.08e-08 1.18e-07 5.26e-07 2.72e-07 6.53e-07 erg/cm2
Peak flux CPL 1.26e+00 8.87e-01 4.32e-01 3.60e-01 2.73e+00 2.93e+00 ph/cm2/s
90%_error_low -1.72e-01 -1.19e-01 -6.83e-02 -5.17e-02 -3.17e-01 -4.29e-01 ph/cm2/s
90%_error_hi 1.21e-01 8.44e-02 4.67e-02 7.74e-02 2.38e-01 2.78e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 214.5283 -60.2682 0.0052 23.4516 -74.7558 4.6644762 37.172 TRIG_00844015 Foreground time interval of the image: -35.635 16.165 (delta_t = 51.800 [sec]) Background time interval of the image:
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 -61.820 sec. to 114.068 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.44245 ( -0.0398378 0.0399052 ) Norm@50keV : 6.78980E-03 ( -0.000138126 0.000138061 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 65.03 using 59 PHA bins. # Reduced chi-squared = 1.141 for 57 degrees of freedom # Null hypothesis probability = 2.174588e-01 Photon flux (15-150 keV) in 175.9 sec: 0.835212 ( -0.019635 0.019746 ) ph/cm2/s Energy fluence (15-150 keV) : 1.14463e-05 ( -2.38381e-07 2.386e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -61.820 sec. to 114.068 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.4297 ( -0.0533473 0.141683 ) Epeak [keV] : 2581.24 ( -955.673 -955.673 ) Norm@50keV : 6.87697E-03 ( -0.00018438 0.0011823 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 64.98 using 59 PHA bins. # Reduced chi-squared = 1.160 for 56 degrees of freedom # Null hypothesis probability = 1.922547e-01 Photon flux (15-150 keV) in 175.9 sec: 0.834059 ( -0.022275 0.020476 ) ph/cm2/s Energy fluence (15-150 keV) : 1.14318e-05 ( -2.86937e-07 2.71674e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 59.108 sec. to 60.108 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.30451 ( -0.0764594 0.0763573 ) Norm@50keV : 4.48258E-02 ( -0.00190236 0.00190136 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.18 using 59 PHA bins. # Reduced chi-squared = 0.8978 for 57 degrees of freedom # Null hypothesis probability = 6.922703e-01 Photon flux (15-150 keV) in 1 sec: 5.35237 ( -0.23333 0.23365 ) ph/cm2/s Energy fluence (15-150 keV) : 4.42527e-07 ( -2.10441e-08 2.11227e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 59.108 sec. to 60.108 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.22433 ( -0.117653 0.291573 ) Epeak [keV] : 525.588 ( -525.835 -525.835 ) Norm@50keV : 4.89027E-02 ( -0.0086197 0.017565 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 50.93 using 59 PHA bins. # Reduced chi-squared = 0.9095 for 56 degrees of freedom # Null hypothesis probability = 6.665418e-01 Photon flux (15-150 keV) in 1 sec: 2.72611 ( -0.31749 0.23766 ) ph/cm2/s Energy fluence (15-150 keV) : 4.40372e-07 ( -2.24165e-08 2.21262e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 114.88 sec. Hardness ratio (energy fluence ratio) = 1.47180390027
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.195234e-06 S(50-150 keV) = 7.251003e-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 = 1.140624047034001E-01, IMY = 4.185433300692041E-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:
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -35.635400 16.164600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 187.0051 -62.8614 0.0 36.7 -76.7 0.7740 3.3 11.0 GX 301-2 244.9679 -15.6537 0.7 31.8 54.9 2.6531 16.1 1.0 Sco X-1 255.8956 -37.9764 4.7 10.8 94.3 -0.2520 -2.4 9.0 4U 1700-377 256.6592 -36.3749 6.0 12.5 93.4 0.2114 1.9 11.2 GX 349+2 262.8133 -24.8395 0.0 25.2 93.2 0.2488 1.7 12.1 GX 1+4 264.7577 -44.6085 49.4 11.6 143.8 0.0218 0.2 9.5 4U 1735-44 270.2990 -25.1008 8.3 28.2 106.9 0.2152 1.4 1.5 GX 5-1 270.2851 -25.6368 4.3 27.7 107.4 0.4042 2.8 6.4 GRS 1758-258 274.1447 -13.9624 4.8 39.6 102.5 -0.8999 -2.4 9.2 GX 17+2 276.0411 -30.2693 38.9 27.2 122.4 0.0399 0.3 8.4 H1820-303 284.8911 -24.8681 11.3 36.5 126.2 -0.2335 -1.0 8.5 HT1900.1-2455 262.9686 -33.8117 4.2 17.4 105.5 0.3219 2.7 1.7 GX 354-0 286.1046 -18.2276 2.8 42.3 120.8 1.6141 4.1 ------ UNKNOWN 231.4273 -0.1845 2.7 49.4 38.6 2.0516 4.3 ------ UNKNOWN 280.6358 -64.2066 2.3 24.3 -153.1 0.5237 5.1 ------ UNKNOWN 338.6738 -57.6440 2.4 51.7 -161.7 1.3813 4.9 ------ UNKNOWN 214.5283 -60.2682 0.3 23.5 -74.8 4.6645 37.2 ------ UNKNOWN 177.7895 -53.2214 3.3 43.7 -63.9 1.4737 3.5 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 66.164600 962.534800 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.3406 -60.5544 2.2 21.4 -93.6 4.1442 5.3 4.2 Cen X-3 187.0236 -62.6468 0.0 13.3 -95.7 0.5987 0.9 12.5 GX 301-2 256.2339 -37.8125 0.0 34.4 84.9 -1.8183 -1.2 11.9 4U 1700-377 256.3032 -36.3583 8.7 35.6 83.5 -2.2285 -1.3 7.5 GX 349+2 264.7072 -44.5316 4.2 33.3 101.4 3.6038 2.7 5.1 4U 1735-44 222.3826 -7.9096 3.0 52.7 26.3 11.8445 3.9 ------ UNKNOWN 214.5855 -60.2512 2.1 0.0 48.8 3.5104 5.5 ------ UNKNOWN 215.4057 -62.7291 1.5 2.5 -172.3 4.9156 7.7 ------ UNKNOWN 27.4869 -73.7675 2.9 45.9 -166.2 4.9650 3.9 ------ UNKNOWN 191.5644 -11.0009 4.3 52.1 -12.5 4.3698 2.7 ------ UNKNOWN 180.5637 -22.0299 3.9 45.0 -30.6 3.4727 3.0 ------ UNKNOWN 121.9862 -71.6881 2.9 35.2 -130.4 4.5538 4.1 ------ UNKNOWN 46.2485 -62.9454 3.7 56.5 -157.1 14.0326 3.1 ------ UNKNOWN 171.8092 -19.5596 4.4 50.7 -39.3 8.4567 2.7 ------ UNKNOWN 98.9227 -62.2763 3.9 48.0 -129.1 12.9514 3.0 ------ UNKNOWN 96.7960 -62.4247 3.5 48.5 -130.3 14.3692 3.3 ------ UNKNOWN 91.6245 -62.6026 3.3 49.7 -133.0 15.7278 3.5 ------ UNKNOWN