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 Mar 1 21:54:20 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger630876
======================================================================
Trigger: 00630876 Segment: 000
BAT Trigger Time: 445431452.224 [s; MET]
Trigger Stop: 445431452.736 [s; MET]
UTC: 2015-02-12T10:57:19.047700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 285.521339180983 Dec: 47.407424552007 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.9
Image Trigger?: NO
Rate S/N Ratio: 18.5472369909914 [ if not an image trigger ]
Image S/N Ratio: 7.9
Analysis Position: [ source = BAT ]
RA: 285.521339180983 Dec: 47.407424552007 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 285.491082509229 Dec: 47.3849489444433 [deg; J2000]
{ 19h 01m 57.9s , +47d 23' 05.8" }
+/- 1.11809868000682 [arcmin] (estimated 90% radius based on SNR)
+/- 0.481010145479992 [arcmin] (formal 1-sigma fit error)
SNR: 25.9334947009701
Angular difference between the analysis and refined position is 1.824478 arcmin
Partial Coding Fraction: 0.7109375 [ including projection effects ]
Duration
T90: 15.4880000352859 +/- 3.3182935415225
Measured from: 0.248000025749207
to: 15.7360000610352 [s; relative to TRIGTIME]
T50: 5.216000020504 +/- 0.769332189989922
Measured from: 1.6240000128746
to: 6.8400000333786 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.828000009059906
to: 1.82800000905991 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.296000003814697
to: 19.4800000190735 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.371080 0.552233 0.430091 0.085263
0.027038 0.028766 0.025620 0.021862 [error]
Peak 0.046813 0.102168 0.073321 0.015536
0.006580 0.007581 0.006913 0.005503 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 19.776 -0.296 19.480
T90 15.488 0.248 15.736
T50 5.216 1.624 6.840
Peak 1.000 0.828 1.828
====== 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 -1.493 -0.108 0.107 - - - 4.79e-03 -2.92e-04 2.91e-04 49.190 57
CPL -1.282 -0.266 0.431 171.848 N/A N/A 6.11e-03 N/A N/A 48.380 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 -1.259 -0.153 0.154 - - - 1.60e-02 -1.45e-03 1.45e-03 62.760 57
CPL -1.055 -0.285 0.656 235.804 -235.804 -235.804 2.03e-02 -5.57e-03 2.23e-02 62.420 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 1.20e-07 2.22e-07 3.15e-07 9.45e-07 9.00e-07 1.60e-06 erg/cm2
90%_error_low -1.23e-08 -1.38e-08 -2.52e-08 -1.54e-07 -6.03e-08 -1.75e-07 erg/cm2
90%_error_hi 1.27e-08 1.38e-08 2.51e-08 1.74e-07 6.08e-08 1.91e-07 erg/cm2
Peak flux PL 5.24e-01 6.09e-01 5.09e-01 7.16e-01 1.90e+00 2.36e+00 ph/cm2/s
90%_error_low -8.37e-02 -6.16e-02 -5.55e-02 -1.50e-01 -1.73e-01 -2.25e-01 ph/cm2/s
90%_error_hi 8.74e-02 6.09e-02 5.50e-02 1.74e-01 1.73e-01 2.28e-01 ph/cm2/s
Fluence CPL 1.16e-07 2.26e-07 3.19e-07 6.80e-07 8.85e-07 1.34e-06 erg/cm2
90%_error_low -1.47e-08 -1.63e-08 -2.66e-08 -3.01e-07 -6.73e-08 -3.07e-07 erg/cm2
90%_error_hi 1.49e-08 1.66e-08 2.71e-08 3.10e-07 6.71e-08 3.27e-07 erg/cm2
Peak flux CPL 5.06e-01 6.22e-01 5.19e-01 5.56e-01 1.89e+00 2.20e+00 ph/cm2/s
90%_error_low -9.87e-02 -6.92e-02 -6.18e-02 -2.78e-01 -1.78e-01 -3.35e-01 ph/cm2/s
90%_error_hi 9.23e-02 7.36e-02 6.37e-02 2.05e-01 1.77e-01 3.04e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 285.4911 47.3849 0.0075 20.5249 -94.3089 1.4508378 25.933 TRIG_00630876 Foreground time interval of the image: -0.296 19.480 (delta_t = 19.776 [sec]) Background time interval of the image: -239.224 -0.296 (delta_t = 238.928 [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 -0.296 sec. to 19.480 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.49259 ( -0.107551 0.106851 ) Norm@50keV : 4.79094E-03 ( -0.000291598 0.000290601 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.19 using 59 PHA bins. # Reduced chi-squared = 0.8629 for 57 degrees of freedom # Null hypothesis probability = 7.595896e-01 Photon flux (15-150 keV) in 19.78 sec: 0.596928 ( -0.036122 0.036164 ) ph/cm2/s Energy fluence (15-150 keV) : 9.00194e-07 ( -6.03349e-08 6.07905e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.296 sec. to 19.480 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.28219 ( -0.265955 0.431355 ) Epeak [keV] : 171.848 ( ) Norm@50keV : 6.10932E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 48.38 using 59 PHA bins. # Reduced chi-squared = 0.8640 for 56 degrees of freedom # Null hypothesis probability = 7.553575e-01 Photon flux (15-150 keV) in 19.78 sec: 0.590480 ( -0.038097 0.038074 ) ph/cm2/s Energy fluence (15-150 keV) : 8.84842e-07 ( -6.72512e-08 6.70904e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.828 sec. to 1.828 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.25949 ( -0.153424 0.154234 ) Norm@50keV : 1.60366E-02 ( -0.00145105 0.00144809 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.76 using 59 PHA bins. # Reduced chi-squared = 1.101 for 57 degrees of freedom # Null hypothesis probability = 2.794857e-01 Photon flux (15-150 keV) in 1 sec: 1.89968 ( -0.17322 0.17334 ) ph/cm2/s Energy fluence (15-150 keV) : 1.60111e-07 ( -1.63139e-08 1.64725e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.828 sec. to 1.828 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.05486 ( -0.285305 0.656398 ) Epeak [keV] : 235.804 ( -235.869 -235.869 ) Norm@50keV : 2.03307E-02 ( -0.00556783 0.0223217 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 62.42 using 59 PHA bins. # Reduced chi-squared = 1.115 for 56 degrees of freedom # Null hypothesis probability = 2.588426e-01 Photon flux (15-150 keV) in 1 sec: 1.88655 ( -0.17759 0.17728 ) ph/cm2/s Energy fluence (15-150 keV) : 5.84104e-08 ( -1.80942e-08 1.60217e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 15.488 sec. Hardness ratio (energy fluence ratio) = 1.42154213893
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.4198e-07 S(50-150 keV) = 5.58221e-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 = -2.812855980010357E-02, IMY = 3.733217457240708E-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: -239.224000 -0.296000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.4621 35.3655 2.1 20.0 -13.5 1.0125 5.6 1.4 Her X-1 299.5619 35.2264 3.2 36.4 -89.8 2.0389 3.6 2.0 Cyg X-1 308.1079 41.0677 8.1 37.2 -104.6 0.7448 1.4 6.9 Cyg X-3 148.6109 73.0882 2.4 42.2 141.0 2.3280 4.8 ------ UNKNOWN 229.8842 27.8002 2.4 32.9 29.0 1.1288 4.7 ------ UNKNOWN 33.6154 66.6898 4.1 54.1 -175.6 1.8896 3.3 ------ UNKNOWN 33.6663 66.5227 4.0 54.2 -175.5 2.3375 3.9 ------ UNKNOWN 250.7563 10.6427 2.9 44.9 -8.7 1.1350 4.0 ------ UNKNOWN 321.9477 42.5494 2.9 44.0 -116.7 3.1052 4.0 ------ UNKNOWN 326.3319 44.0717 2.9 45.4 -121.3 3.1702 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.296000 19.480000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5337 35.4560 18.8 19.9 -13.7 0.0281 0.6 7.8 Her X-1 299.5412 35.1610 13.1 36.5 -89.7 -0.1087 -0.9 3.4 Cyg X-1 307.9865 40.9247 21.3 37.2 -104.3 0.0644 0.5 5.9 Cyg X-3 10.0311 71.6610 2.8 45.2 -170.7 0.3316 4.1 ------ UNKNOWN 285.4911 47.3849 0.4 20.5 -94.3 1.4507 25.9 ------ UNKNOWN 283.1896 43.4638 2.4 21.7 -83.0 0.2719 4.8 ------ UNKNOWN 308.6136 49.5152 2.3 32.4 -116.9 0.3529 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 337.876600 422.876000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5212 35.1435 4.7 26.1 25.0 -2.6852 -2.4 12.3 Her X-1 268.5411 -1.3943 8.7 51.0 -26.2 3.4258 1.3 11.0 SW J1753.5-0127 288.9160 11.0171 6.8 36.5 -53.9 2.7558 1.7 8.1 GRS 1915+105 299.6754 35.0681 8.6 16.3 -94.0 -1.3723 -1.3 9.0 Cyg X-1 308.1789 41.0101 6.0 17.4 -125.0 -2.0494 -1.9 4.6 Cyg X-3 326.1677 38.3140 204.2 30.8 -136.1 -0.0752 -0.1 0.5 Cyg X-2 277.2423 67.3413 2.8 20.4 122.7 4.4349 4.1 ------ UNKNOWN 327.8847 68.7809 3.6 29.9 161.2 3.6608 3.2 ------ UNKNOWN 266.2253 44.6534 2.6 13.6 37.2 3.9103 4.4 ------ UNKNOWN 262.6061 -5.3124 2.5 56.4 -20.5 17.8770 4.7 ------ UNKNOWN 290.5685 1.2534 2.1 46.4 -55.2 26.6171 5.5 ------ UNKNOWN