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: Wed Jun 1 15:19:58 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger685245
======================================================================
Trigger: 00685245 Segment: 000
BAT Trigger Time: 484198172.096 [s; MET]
Trigger Stop: 484198175.168 [s; MET]
UTC: 2016-05-06T03:29:15.868860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 265.773548793878 Dec: -46.1170075164307 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.19
Image Trigger?: NO
Rate S/N Ratio: 10.0995049383621 [ if not an image trigger ]
Image S/N Ratio: 7.19
Analysis Position: [ source = BAT ]
RA: 265.773548793878 Dec: -46.1170075164307 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 265.849166644648 Dec: -46.1250911519052 [deg; J2000]
{ 17h 43m 23.8s , -46d 07' 30.3" }
+/- 1.59612585662831 [arcmin] (estimated 90% radius based on SNR)
+/- 0.591766556911414 [arcmin] (formal 1-sigma fit error)
SNR: 15.5963321491565
Angular difference between the analysis and refined position is 3.181994 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 260.527999937534 +/- 78.3182114524323
Measured from: -2.55199998617172
to: 257.975999951363 [s; relative to TRIGTIME]
T50: 105.235999941826 +/- 71.0785157584062
Measured from: 13.539999961853
to: 118.775999903679 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 98.783999979496
to: 99.783999979496 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.09600001573563
to: 336.01599997282 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.362534 1.059857 0.693505 -0.077292
0.120147 0.111238 0.090994 0.076145 [error]
Peak 0.021362 0.010535 0.016911 0.012989
0.006620 0.006142 0.004976 0.004036 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 345.112 -9.096 336.016
T90 260.528 -2.552 257.976
T50 105.236 13.540 118.776
Peak 1.000 98.784 99.784
====== 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 -2.122 -0.239 0.223 - - - 4.75e-04 -7.01e-05 6.75e-05 55.920 57
CPL -1.994 -0.021 0.416 2.956 N/A N/A 5.42e-04 N/A N/A 56.310 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 -0.895 -0.783 1.079 - - - 3.24e-03 -1.55e-03 1.15e-03 46.420 57
CPL -0.944 -0.735 1.151 9999.360 -9999.360 -9999.360 3.31e-03 -1.60e-03 3.94e-03 46.460 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 3.77e-07 4.75e-07 4.36e-07 7.01e-07 1.53e-06 1.99e-06 erg/cm2
90%_error_low -5.94e-08 -5.13e-08 -8.86e-08 -2.50e-07 -1.95e-07 -3.54e-07 erg/cm2
90%_error_hi 6.13e-08 5.11e-08 9.07e-08 3.31e-07 2.00e-07 4.14e-07 erg/cm2
Peak flux PL 7.48e-02 1.08e-01 1.17e-01 2.34e-01 3.72e-01 5.33e-01 ph/cm2/s
90%_error_low -6.01e-02 -1.08e-01 -4.00e-02 -1.55e-01 -3.72e-01 -1.76e-01 ph/cm2/s
90%_error_hi 9.14e-02 5.88e-02 3.71e-02 3.78e-01 1.43e-01 2.64e-01 ph/cm2/s
Fluence CPL 3.78e-07 4.27e-07 3.60e-07 6.27e-07 1.36e-06 2.04e-06 erg/cm2
90%_error_low -6.26e-08 -1.53e-07 -2.16e-07 -4.90e-07 -5.28e-07 -1.12e-06 erg/cm2
90%_error_hi 6.27e-08 9.26e-08 1.60e-07 4.92e-07 3.66e-07 4.77e-07 erg/cm2
Peak flux CPL 7.75e-02 4.38e-02 1.57e-02 9.22e-03 1.43e-01 1.48e-01 ph/cm2/s
90%_error_low -7.75e-02 N/A -1.57e-02 -9.22e-03 N/A -1.48e-01 ph/cm2/s
90%_error_hi 1.10e-01 N/A 4.33e-02 3.27e-02 N/A 1.88e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 265.8492 -46.1251 0.0123 17.1708 -16.1199 1.3944658 15.596 TRIG_00685245 Foreground time interval of the image: -9.096 44.005 (delta_t = 53.101 [sec]) Background time interval of the image: -218.995 -9.096 (delta_t = 209.899 [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 -9.096 sec. to 336.016 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.12205 ( -0.239003 0.222873 ) Norm@50keV : 4.75003E-04 ( -7.00686e-05 6.74977e-05 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.92 using 59 PHA bins. # Reduced chi-squared = 0.9810 for 57 degrees of freedom # Null hypothesis probability = 5.157344e-01 Photon flux (15-150 keV) in 345.1 sec: 7.55604E-02 ( -0.008128 0.008143 ) ph/cm2/s Energy fluence (15-150 keV) : 1.52674e-06 ( -1.95198e-07 1.99555e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.096 sec. to 336.016 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.37555 ( -0.0164401 0.421146 ) Epeak [keV] : 146.443 ( ) Norm@50keV : 3.55852E-04 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 55.51 using 59 PHA bins. # Reduced chi-squared = 0.9912 for 56 degrees of freedom # Null hypothesis probability = 4.934430e-01 Photon flux (15-150 keV) in 345.1 sec: 7.08647E-02 ( -0.0168517 0.0127907 ) ph/cm2/s Energy fluence (15-150 keV) : 1.3635e-06 ( -5.27503e-07 3.66137e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 98.784 sec. to 99.784 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.895164 ( -0.784762 1.07696 ) Norm@50keV : 3.24353E-03 ( -0.00155097 0.00115456 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.42 using 59 PHA bins. # Reduced chi-squared = 0.8144 for 57 degrees of freedom # Null hypothesis probability = 8.403919e-01 Photon flux (15-150 keV) in 1 sec: 0.371987 ( -0.371987 0.143175 ) ph/cm2/s Energy fluence (15-150 keV) : 3.6488e-08 ( -1.21234e-08 1.20386e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 98.784 sec. to 99.784 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.943898 ( -0.737217 1.14874 ) Epeak [keV] : 9999.36 ( -9999.36 -9999.36 ) Norm@50keV : 3.30626E-03 ( -0.00159832 0.00394005 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 46.46 using 59 PHA bins. # Reduced chi-squared = 0.8296 for 56 degrees of freedom # Null hypothesis probability = 8.145607e-01 Photon flux (15-150 keV) in 1 sec: 0.142537 ( ) ph/cm2/s Energy fluence (15-150 keV) : 1.04263e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 260.528 sec. Hardness ratio (energy fluence ratio) = 0.918924848595
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 8.516094e-07 S(50-150 keV) = 6.751098e-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 = 2.968448034931285E-01, IMY = 8.579179527188278E-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: -218.995400 -9.096000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9642 -15.6461 0.5 23.8 101.8 7.2571 23.7 0.9 Sco X-1 255.9707 -37.8256 2.2 12.4 24.3 1.1151 5.1 1.3 4U 1700-377 256.2185 -36.4583 5.1 11.4 28.7 0.5077 2.3 10.7 GX 349+2 263.0220 -24.7444 5.3 5.2 125.9 0.4924 2.2 0.7 GX 1+4 264.5652 -44.5661 10.6 15.7 -12.6 0.2423 1.1 10.3 4U 1735-44 268.2169 -1.4813 8.0 27.5 166.4 -0.3897 -1.4 9.2 SW J1753.5-0127 270.3282 -25.1218 2.9 5.2 -154.5 0.9431 4.1 3.5 GX 5-1 270.3003 -25.7156 3.9 4.7 -149.9 0.7888 3.5 1.7 GRS 1758-258 274.0941 -14.1281 5.1 16.4 -170.3 0.5154 2.3 7.5 GX 17+2 275.9788 -30.3926 4.4 8.4 -95.3 0.5682 2.7 3.2 H1820-303 284.8829 -24.9296 7.9 16.9 -116.9 -0.3508 -1.5 8.3 HT1900.1-2455 288.7872 10.9469 5.6 45.4 -165.8 0.9732 2.0 0.7 GRS 1915+105 263.1211 -33.9741 3.5 5.8 11.0 0.7053 3.3 10.6 GX 354-0 244.3122 6.3926 2.2 41.3 128.0 4.0385 5.2 ------ UNKNOWN 210.0151 -42.4121 3.5 46.9 40.0 2.3624 3.3 ------ UNKNOWN 255.3113 -41.6786 1.9 15.6 14.9 1.3344 6.0 ------ UNKNOWN 282.4033 26.1738 2.7 57.2 179.6 5.6398 4.3 ------ UNKNOWN 282.7649 -66.7430 3.7 39.1 -27.6 1.0327 3.1 ------ UNKNOWN 308.6426 -40.8383 4.7 36.2 -76.9 1.5031 2.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -9.096000 44.004600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.1106 -15.5466 4.7 23.8 102.2 0.3004 2.4 9.4 Sco X-1 255.9957 -38.0106 8.4 12.5 23.6 0.1283 1.4 10.0 4U 1700-377 256.5591 -36.5694 8.3 11.2 27.4 0.1274 1.4 10.6 GX 349+2 263.1536 -24.8243 4.8 5.1 126.5 -0.2137 -2.4 9.2 GX 1+4 264.7618 -44.5245 3.0 15.6 -13.1 0.3399 3.9 4.5 4U 1735-44 268.2407 -1.4109 3.7 27.6 166.4 0.3222 3.1 8.0 SW J1753.5-0127 270.1803 -24.9858 11.9 5.2 -156.6 -0.0848 -1.0 8.0 GX 5-1 270.0977 -25.8465 0.0 4.5 -150.4 0.2253 2.5 12.7 GRS 1758-258 274.1262 -14.1618 3.8 16.4 -170.2 -0.2671 -3.0 10.3 GX 17+2 276.0816 -30.4500 23.8 8.5 -95.0 -0.0432 -0.5 9.5 H1820-303 284.8943 -24.7693 10.7 17.0 -117.4 0.1050 1.1 11.9 HT1900.1-2455 288.6728 10.8511 4.8 45.2 -165.9 -0.3872 -2.4 9.3 GRS 1915+105 262.8541 -33.8369 19.6 5.8 13.6 0.0528 0.6 6.7 GX 354-0 265.8492 -46.1251 0.7 17.2 -16.1 1.3945 15.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 83.804590 962.944700 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.4209 -60.6848 5.4 53.4 11.6 -4.7441 -2.1 4.8 Cen X-3 186.6585 -62.7493 1.1 45.5 13.3 14.9662 10.5 1.3 GX 301-2 244.9770 -15.6399 0.5 35.1 117.7 37.0644 21.2 0.1 Sco X-1 255.9732 -37.8497 0.9 11.0 109.5 9.3526 12.4 0.7 4U 1700-377 256.3613 -36.4399 7.0 12.0 114.9 1.2254 1.6 3.7 GX 349+2 263.0159 -24.7551 5.5 21.5 147.4 1.6612 2.1 0.7 GX 1+4 264.4905 -44.4749 73.4 1.9 125.2 0.1359 0.2 10.9 4U 1735-44 268.2291 -1.4593 7.0 44.7 157.7 -3.3393 -1.6 8.3 SW J1753.5-0127 270.3300 -25.1021 3.4 21.3 165.7 2.6227 3.4 2.8 GX 5-1 270.3040 -25.6837 4.6 20.8 165.8 1.9602 2.6 3.6 GRS 1758-258 273.9812 -14.0322 2.7 32.8 169.1 3.8566 4.2 1.5 GX 17+2 275.8726 -30.3636 7.3 17.6 -175.7 1.1032 1.6 2.7 H1820-303 285.0349 -24.9134 119.4 26.2 -163.1 0.0731 0.1 0.4 HT1900.1-2455 263.0100 -33.8224 2.8 12.5 143.6 2.9308 4.2 1.3 GX 354-0 245.0789 -14.3388 3.3 36.2 118.8 5.9802 3.5 ------ UNKNOWN 166.7516 -62.7486 4.0 53.8 8.3 6.6986 2.9 ------ UNKNOWN 305.5039 0.1691 4.7 57.9 -156.8 13.0790 2.5 ------ UNKNOWN