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: Tue May 5 10:38:07 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger635289
======================================================================
Trigger: 00635289 Segment: 000
BAT Trigger Time: 448355106.624 [s; MET]
Trigger Stop: 448355123.008 [s; MET]
UTC: 2015-03-18T07:04:53.299140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 324.970714696083 Dec: -61.4766556855567 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.87
Image Trigger?: NO
Rate S/N Ratio: 10.0995049383621 [ if not an image trigger ]
Image S/N Ratio: 9.87
Analysis Position: [ source = BAT ]
RA: 324.970714696083 Dec: -61.4766556855567 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 324.988048838298 Dec: -61.4611862967479 [deg; J2000]
{ 21h 39m 57.1s , -61d 27' 40.3" }
+/- 1.19149830001568 [arcmin] (estimated 90% radius based on SNR)
+/- 0.418628160288125 [arcmin] (formal 1-sigma fit error)
SNR: 23.681733210239
Angular difference between the analysis and refined position is 1.052740 arcmin
Partial Coding Fraction: 0.4453125 [ including projection effects ]
Duration
T90: 87.4439999461174 +/- 20.8383346645468
Measured from: 3.03600001335144
to: 90.4799999594688 [s; relative to TRIGTIME]
T50: 42.5719999074936 +/- 4.02978513486005
Measured from: 23.6800000071526
to: 66.2519999146461 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 66.6159999966621
to: 67.6159999966621 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.51600003242493
to: 115.004000008106 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.596368 1.902663 0.749545 0.195369
0.088456 0.091099 0.079386 0.069927 [error]
Peak 0.050931 0.059104 0.015600 0.006037
0.008889 0.009238 0.007454 0.006793 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 119.520 -4.516 115.004
T90 87.444 3.036 90.480
T50 42.572 23.680 66.252
Peak 1.000 66.616 67.616
====== 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 -2.057 -0.122 0.119 - - - 2.22e-03 -1.74e-04 1.71e-04 69.300 57
CPL -1.529 -0.490 0.633 36.300 -32.017 14.100 4.51e-03 -2.18e-03 6.11e-03 66.470 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 -2.039 -0.384 0.353 - - - 7.39e-03 -1.92e-03 1.86e-03 57.880 57
CPL -1.116 -1.005 5.451 34.984 N/A N/A 2.83e-02 N/A N/A 57.220 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 5.73e-07 7.51e-07 7.22e-07 1.23e-06 2.45e-06 3.28e-06 erg/cm2
90%_error_low -5.23e-08 -4.69e-08 -7.70e-08 -2.45e-07 -1.77e-07 -3.33e-07 erg/cm2
90%_error_hi 5.33e-08 4.69e-08 7.82e-08 2.84e-07 1.79e-07 3.61e-07 erg/cm2
Peak flux PL 5.11e-01 3.75e-01 1.83e-01 1.26e-01 1.13e+00 1.19e+00 ph/cm2/s
90%_error_low -1.39e-01 -7.56e-02 -5.96e-02 -6.37e-02 -2.27e-01 -2.41e-01 ph/cm2/s
90%_error_hi 1.44e-01 7.55e-02 6.21e-02 9.54e-02 2.27e-01 2.42e-01 ph/cm2/s
Fluence CPL 5.48e-07 7.96e-07 6.94e-07 4.81e-07 2.31e-06 2.52e-06 erg/cm2
90%_error_low -5.91e-08 -6.51e-08 -9.74e-08 -2.85e-07 -2.22e-07 -3.71e-07 erg/cm2
90%_error_hi 5.92e-08 6.71e-08 8.94e-08 7.46e-07 2.28e-07 7.79e-07 erg/cm2
Peak flux CPL 4.94e-01 4.19e-01 1.63e-01 3.02e-02 1.10e+00 1.11e+00 ph/cm2/s
90%_error_low -7.96e-02 N/A -1.29e-01 -3.02e-02 -2.42e-01 -2.48e-01 ph/cm2/s
90%_error_hi 1.50e-01 N/A 7.79e-02 1.32e-01 2.35e-01 3.07e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 324.9880 -61.4612 0.0081 33.5054 148.3565 4.1721371 23.682 TRIG_00635289 Foreground time interval of the image: -4.516 76.877 (delta_t = 81.393 [sec]) Background time interval of the image: -361.323 -345.494 (delta_t = 15.829 [sec]) -239.624 -4.516 (delta_t = 235.108 [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 -4.516 sec. to 115.004 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.05709 ( -0.12247 0.119035 ) Norm@50keV : 2.21867E-03 ( -0.000173524 0.00017127 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 69.30 using 59 PHA bins. # Reduced chi-squared = 1.216 for 57 degrees of freedom # Null hypothesis probability = 1.271279e-01 Photon flux (15-150 keV) in 119.5 sec: 0.341870 ( -0.021649 0.021667 ) ph/cm2/s Energy fluence (15-150 keV) : 2.45459e-06 ( -1.76725e-07 1.78816e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.516 sec. to 115.004 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.52868 ( -0.490048 0.633019 ) Epeak [keV] : 36.2999 ( -32.0192 14.0978 ) Norm@50keV : 4.51442E-03 ( -0.00218143 0.00610071 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.47 using 59 PHA bins. # Reduced chi-squared = 1.187 for 56 degrees of freedom # Null hypothesis probability = 1.597806e-01 Photon flux (15-150 keV) in 119.5 sec: 0.333672 ( -0.023238 0.023143 ) ph/cm2/s Energy fluence (15-150 keV) : 2.30988e-06 ( -2.22368e-07 2.28103e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 66.616 sec. to 67.616 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.03878 ( -0.384229 0.353454 ) Norm@50keV : 7.38764E-03 ( -0.00192383 0.00186068 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.88 using 59 PHA bins. # Reduced chi-squared = 1.015 for 57 degrees of freedom # Null hypothesis probability = 4.425228e-01 Photon flux (15-150 keV) in 1 sec: 1.12846 ( -0.226721 0.22678 ) ph/cm2/s Energy fluence (15-150 keV) : 6.83015e-08 ( -1.61196e-08 1.673e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 66.616 sec. to 67.616 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.1161 ( -1.01197 5.44445 ) Epeak [keV] : 34.9837 ( ) Norm@50keV : 2.82761E-02 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 57.22 using 59 PHA bins. # Reduced chi-squared = 1.022 for 56 degrees of freedom # Null hypothesis probability = 4.297162e-01 Photon flux (15-150 keV) in 1 sec: 1.09983 ( -0.24205 0.23504 ) ph/cm2/s Energy fluence (15-150 keV) : 6.04338e-08 ( -2.01129e-08 2.1507e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 87.444 sec. Hardness ratio (energy fluence ratio) = 0.961236006156
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.3236595e-06 S(50-150 keV) = 1.1309402e-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 = -5.635977089525922E-01, IMY = -3.473171845361346E-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: -361.323400 -345.494000 -239.624000 -4.516000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 89.3449 -41.5212 3.5 50.2 37.1 3.5575 3.3 ------ UNKNOWN 52.8517 -55.2038 3.3 23.8 50.3 0.8726 3.6 ------ UNKNOWN 302.7552 -33.6303 2.5 56.7 179.1 5.9724 4.7 ------ UNKNOWN 49.9936 -23.8887 2.2 34.2 -14.5 1.2248 5.1 ------ UNKNOWN 26.8857 -33.0217 3.0 14.9 -43.4 0.8079 3.8 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -4.516000 76.876600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 53.4129 -62.3261 2.1 25.9 66.5 0.8459 5.4 ------ UNKNOWN 324.9880 -61.4612 0.5 33.5 148.4 4.1718 23.7 ------ UNKNOWN 64.7397 -9.6743 2.8 54.1 -12.0 1.3212 4.1 ------ UNKNOWN 348.3716 -25.2190 2.3 31.3 -133.4 0.6833 4.9 ------ UNKNOWN 330.2965 -11.7879 2.5 52.6 -140.1 2.2841 4.7 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 130.076590 962.483800 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 255.9843 -37.8428 56.3 47.6 140.4 -0.4969 -0.2 0.1 4U 1700-377 256.5747 -36.4194 8.4 48.5 142.0 3.3804 1.4 6.7 GX 349+2 264.8665 -44.3246 9.8 38.4 141.9 1.4224 1.2 9.2 4U 1735-44 270.3241 -24.9245 38.5 51.6 163.1 0.6765 0.3 9.5 GX 5-1 270.1979 -25.8508 9.6 50.9 162.4 2.5057 1.2 8.6 GRS 1758-258 275.9629 -30.4594 6.6 44.3 165.2 2.4525 1.7 5.9 H1820-303 284.8636 -24.8274 0.0 45.6 178.8 2.8108 2.6 10.9 HT1900.1-2455 263.0350 -33.8221 153.3 47.5 149.8 -0.1551 -0.1 2.4 GX 354-0 266.5057 -46.2752 3.0 36.2 141.1 4.0561 3.9 ------ UNKNOWN 282.4383 -23.9208 3.6 47.3 176.6 3.8309 3.2 ------ UNKNOWN 14.8352 -48.7031 2.7 30.3 -37.9 2.6261 4.3 ------ UNKNOWN 301.6589 -12.3524 2.9 52.0 -155.6 6.4610 4.0 ------ UNKNOWN 9.2449 -28.7310 3.2 43.8 -64.0 12.6770 3.7 ------ UNKNOWN 322.7828 -13.5236 2.6 48.0 -129.1 12.1028 4.5 ------ UNKNOWN