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: Sun May 17 01:36:21 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger639275
======================================================================
Trigger: 00639275 Segment: 000
BAT Trigger Time: 451877454.336 [s; MET]
Trigger Stop: 451877466.496 [s; MET]
UTC: 2015-04-28T01:30:40.830840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 188.542964551214 Dec: 6.98089967772161 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.63
Image Trigger?: NO
Rate S/N Ratio: 29.8328677803526 [ if not an image trigger ]
Image S/N Ratio: 12.63
Analysis Position: [ source = BAT ]
RA: 188.542964551214 Dec: 6.98089967772161 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 188.538673448652 Dec: 6.96671144259539 [deg; J2000]
{ 12h 34m 09.3s , +06d 58' 00.2" }
+/- 1.15663426067642 [arcmin] (estimated 90% radius based on SNR)
+/- 0.475345665076019 [arcmin] (formal 1-sigma fit error)
SNR: 24.7080405337351
Angular difference between the analysis and refined position is 0.888827 arcmin
Partial Coding Fraction: 0.1699219 [ including projection effects ]
Duration
T90: 53.2000000476837 +/- 15.37787291802
Measured from: -20.4560000300407
to: 32.744000017643 [s; relative to TRIGTIME]
T50: 21.6320000886917 +/- 1.83630939072554
Measured from: 2.11999994516373
to: 23.7520000338554 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 17.3879999518394
to: 18.3879999518394 [s; relative to TRIGTIME]
Total Fluence
Measured from: -38.9840000271797
to: 38.5999999642372 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.867037 3.026385 2.913393 0.986503
0.145113 0.149580 0.134842 0.110949 [error]
Peak 0.070898 0.122941 0.129270 0.036601
0.017485 0.019918 0.018402 0.015643 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 77.584 -38.984 38.600
T90 53.200 -20.456 32.744
T50 21.632 2.120 23.752
Peak 1.000 17.388 18.388
====== 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 -1.282 -0.091 0.092 - - - 8.20e-03 -4.19e-04 4.18e-04 58.320 57
CPL -1.211 -0.126 0.337 602.376 -602.376 -602.376 8.82e-03 -9.42e-04 3.38e-03 58.350 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 -1.390 -0.275 0.275 - - - 2.46e-02 -4.01e-03 3.99e-03 74.590 57
CPL -1.134 -1.557 1.292 180.793 -180.793 -180.793 3.28e-02 -1.19e-02 9.88e-02 74.430 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 6.63e-07 1.39e-06 2.29e-06 8.52e-06 6.32e-06 1.29e-05 erg/cm2
90%_error_low -6.87e-08 -8.70e-08 -1.31e-07 -1.07e-06 -3.33e-07 -1.14e-06 erg/cm2
90%_error_hi 7.14e-08 8.65e-08 1.30e-07 1.18e-06 3.33e-07 1.22e-06 erg/cm2
Peak flux PL 9.13e-01 9.81e-01 7.48e-01 9.32e-01 2.99e+00 3.57e+00 ph/cm2/s
90%_error_low -2.58e-01 -1.82e-01 -1.44e-01 -3.24e-01 -5.05e-01 -5.85e-01 ph/cm2/s
90%_error_hi 2.81e-01 1.78e-01 1.42e-01 4.10e-01 5.06e-01 5.88e-01 ph/cm2/s
Fluence CPL 6.56e-07 1.40e-06 2.30e-06 8.05e-06 6.31e-06 1.27e-05 erg/cm2
90%_error_low -8.97e-08 -7.48e-08 -1.41e-07 -2.83e-06 -3.44e-07 -3.21e-06 erg/cm2
90%_error_hi 6.23e-08 9.00e-08 1.59e-07 7.33e-07 3.35e-07 1.15e-06 erg/cm2
Peak flux CPL 8.66e-01 1.00e+00 7.72e-01 7.11e-01 2.97e+00 3.35e+00 ph/cm2/s
90%_error_low -3.18e-01 -1.99e-01 -1.63e-01 -7.11e-01 -5.16e-01 -7.48e-01 ph/cm2/s
90%_error_hi 3.17e-01 2.12e-01 1.78e-01 3.17e-01 5.17e-01 7.65e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 188.5387 6.9667 0.0078 43.7027 36.7805 9.4345585 24.708 TRIG_00639275 Foreground time interval of the image: -38.984 38.600 (delta_t = 77.584 [sec]) Background time interval of the image: -239.336 -38.984 (delta_t = 200.352 [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 -38.984 sec. to 38.600 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.28205 ( -0.0913393 0.092149 ) Norm@50keV : 8.20483E-03 ( -0.000418841 0.000417965 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.32 using 59 PHA bins. # Reduced chi-squared = 1.023 for 57 degrees of freedom # Null hypothesis probability = 4.264261e-01 Photon flux (15-150 keV) in 77.58 sec: 0.975705 ( -0.054252 0.054545 ) ph/cm2/s Energy fluence (15-150 keV) : 6.31888e-06 ( -3.32696e-07 3.3324e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -38.984 sec. to 38.600 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.2107 ( -0.0993887 0.364058 ) Epeak [keV] : 602.376 ( -998.611 -998.611 ) Norm@50keV : 8.81757E-03 ( -0.000707914 0.00361373 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 58.35 using 59 PHA bins. # Reduced chi-squared = 1.042 for 56 degrees of freedom # Null hypothesis probability = 3.891353e-01 Photon flux (15-150 keV) in 77.58 sec: 0.973586 ( -0.057536 0.053344 ) ph/cm2/s Energy fluence (15-150 keV) : 6.30753e-06 ( -3.43779e-07 3.35399e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 17.388 sec. to 18.388 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.39009 ( -0.27504 0.275052 ) Norm@50keV : 2.46418E-02 ( -0.00400574 0.00399476 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 74.59 using 59 PHA bins. # Reduced chi-squared = 1.309 for 57 degrees of freedom # Null hypothesis probability = 5.890228e-02 Photon flux (15-150 keV) in 1 sec: 2.99428 ( -0.50465 0.50635 ) ph/cm2/s Energy fluence (15-150 keV) : 2.38622e-07 ( -4.17427e-08 4.1986e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.388 sec. to 18.388 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.13362 ( -1.55692 1.29188 ) Epeak [keV] : 180.793 ( -180.835 -180.835 ) Norm@50keV : 3.28026E-02 ( -0.01191 0.0988501 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 74.43 using 59 PHA bins. # Reduced chi-squared = 1.329 for 56 degrees of freedom # Null hypothesis probability = 5.031863e-02 Photon flux (15-150 keV) in 1 sec: 2.96943 ( -0.51633 0.51672 ) ph/cm2/s Energy fluence (15-150 keV) : 2.35977e-07 ( -4.40748e-08 4.32645e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 53.2 sec. Hardness ratio (energy fluence ratio) = 1.64490221909
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.0550814e-06 S(50-150 keV) = 4.263762e-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 = 7.654619671080761E-01, IMY = -5.722318943621115E-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: -239.336000 -38.984000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.1468 -60.5288 6.2 34.1 -91.6 0.7625 1.9 7.5 Cen X-3 186.7093 -62.7743 1.7 30.5 -105.3 1.9229 6.7 1.5 GX 301-2 244.9943 -15.6450 0.6 41.2 132.9 10.7369 17.8 0.9 Sco X-1 255.9938 -37.8416 1.8 41.7 169.8 2.2892 6.6 0.4 4U 1700-377 256.2596 -36.5287 0.0 42.2 167.9 0.5295 1.4 10.6 GX 349+2 262.8717 -24.6174 31.2 51.5 155.1 -0.3978 -0.4 10.7 GX 1+4 264.6097 -44.4384 9.2 46.9 -179.3 0.5245 1.3 5.7 4U 1735-44 262.9243 -33.8219 6.2 48.2 166.3 1.0757 1.9 3.3 GX 354-0 225.0038 -0.4576 3.6 39.1 93.9 2.5379 3.3 ------ UNKNOWN 217.1023 -4.4131 3.1 32.2 84.4 1.6641 3.7 ------ UNKNOWN 251.8589 -24.0150 2.5 42.7 148.5 2.6651 4.6 ------ UNKNOWN 195.2906 -61.6075 1.4 27.9 -112.0 2.2152 8.2 ------ UNKNOWN 146.5616 -6.8437 3.0 59.4 -17.2 4.6050 3.8 ------ UNKNOWN 263.8997 -67.5848 3.5 47.3 -147.5 1.5436 3.3 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -38.984000 38.600000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 170.5266 -60.5082 5.6 34.0 -91.8 0.4839 2.1 9.3 Cen X-3 186.7731 -62.7876 3.4 30.5 -105.4 -0.6218 -3.4 3.4 GX 301-2 245.1103 -15.7148 4.1 41.3 133.0 -1.0909 -2.8 8.8 Sco X-1 255.9347 -37.9109 17.0 41.6 169.9 0.1501 0.7 4.7 4U 1700-377 256.4479 -36.3633 5.9 42.4 167.8 0.4698 2.0 3.6 GX 349+2 263.0566 -24.7817 99.9 51.6 155.4 -0.0763 -0.1 3.4 GX 1+4 264.7874 -44.5201 5.1 47.0 -179.1 0.5817 2.3 4.6 4U 1735-44 263.1824 -33.9047 5.3 48.3 166.5 0.7198 2.2 10.5 GX 354-0 188.5387 6.9667 0.5 43.7 36.8 9.4345 24.7 ------ UNKNOWN 265.3551 -42.2689 2.5 47.8 178.0 1.1897 4.5 ------ UNKNOWN 159.9053 -33.6921 2.2 36.2 -42.7 0.9115 5.3 ------ UNKNOWN 232.5991 -70.9337 2.0 39.8 -135.0 1.1216 5.7 ------ UNKNOWN 253.4774 -76.0311 2.2 47.5 -135.2 2.0511 5.3 ------ UNKNOWN 143.1257 -30.3931 2.8 50.8 -44.4 2.3592 4.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 158.164600 334.964600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 191.0539 -8.1591 3.3 15.3 132.4 0.5206 3.5 ------ UNKNOWN 185.0416 7.1117 2.1 3.5 -125.6 0.8350 5.5 ------ UNKNOWN 136.2316 -8.6194 3.5 54.5 -144.1 3.7625 3.3 ------ UNKNOWN 153.1990 30.9862 3.0 40.9 -87.6 3.0363 3.8 ------ UNKNOWN