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 Mar 3 23:52:41 EST 2014
Host Name: batevent1
Current Working Dir: /local/data/batevent/batevent_reproc/trigger585149
======================================================================
Trigger: 00585149 Segment: 000
BAT Trigger Time: 412692681.024 [s; MET]
Trigger Stop: 412692682.048 [s; MET]
UTC: 2014-01-29T12:51:09.445000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 326.763234774959 Dec: 26.2066742011522 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.65
Image Trigger?: NO
Rate S/N Ratio: 12.7279220613579 [ if not an image trigger ]
Image S/N Ratio: 7.65
Analysis Position: [ source = BAT ]
RA: 326.763234774959 Dec: 26.2066742011522 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 326.763998868589 Dec: 26.2147232524694 [deg; J2000]
{ 21h 47m 03.4s , +26d 12' 53.0" }
+/- 2.05368689118794 [arcmin] (estimated 90% radius based on SNR)
+/- 1.05093857522619 [arcmin] (formal 1-sigma fit error)
SNR: 10.880300924924
Angular difference between the analysis and refined position is 0.484691 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 1.35999995470047 +/- 0.212941257677667
Measured from: 0.171999990940094
to: 1.53199994564056 [s; relative to TRIGTIME]
T50: 0.843999922275543 +/- 0.233649354794951
Measured from: 0.340000033378601
to: 1.18399995565414 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.171999990940094
to: 1.17199999094009 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0760000348091125
to: 1.58799999952316 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.067576 0.050920 0.030677 0.005099
0.008227 0.008206 0.006799 0.006021 [error]
Peak 0.047543 0.037778 0.022526 -0.001837
0.006614 0.006802 0.005548 0.004802 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 1.512 0.076 1.588
T90 1.360 0.172 1.532
T50 0.844 0.340 1.184
Peak 1.000 0.172 1.172
====== 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 -2.230 -0.350 0.313 - - - 4.96e-03 -1.19e-03 1.14e-03 49.330 57
CPL -1.992 1.992 1.992 1.496 N/A N/A 6.71e-03 N/A N/A 49.790 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 -2.232 -0.381 0.336 - - - 5.39e-03 -1.43e-03 1.39e-03 66.210 57
CPL -2.225 -0.653 0.336 9999.360 N/A N/A 5.41e-03 N/A N/A 66.210 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 1.91e-08 2.26e-08 1.92e-08 2.78e-08 7.08e-08 8.87e-08 erg/cm2
90%_error_low -3.79e-09 -3.77e-09 -6.03e-09 -1.39e-08 -1.38e-08 -2.25e-08 erg/cm2
90%_error_hi 3.84e-09 3.67e-09 6.47e-09 2.13e-08 1.44e-08 2.83e-08 erg/cm2
Peak flux PL 4.50e-01 2.95e-01 1.26e-01 7.32e-02 9.07e-01 9.44e-01 ph/cm2/s
90%_error_low -9.89e-02 -5.39e-02 -4.20e-02 -3.74e-02 -1.54e-01 -1.64e-01 ph/cm2/s
90%_error_hi 1.01e-01 5.28e-02 4.49e-02 5.67e-02 1.54e-01 1.65e-01 ph/cm2/s
Fluence CPL N/A N/A N/A N/A N/A N/A erg/cm2
90%_error_low -3.79e-09 -3.77e-09 -6.03e-09 -1.39e-08 -1.38e-08 -2.25e-08 erg/cm2
90%_error_hi 3.84e-09 3.67e-09 6.47e-09 2.13e-08 1.44e-08 2.83e-08 erg/cm2
Peak flux CPL 4.42e-01 3.04e-01 1.24e-01 4.97e-02 8.97e-01 9.19e-01 ph/cm2/s
90%_error_low -9.25e-02 -5.16e-02 -4.85e-02 -4.97e-02 -1.50e-01 N/A ph/cm2/s
90%_error_hi 9.73e-02 5.21e-02 4.66e-02 9.52e-02 1.58e-01 N/A ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 326.7640 26.2147 0.0177 13.7748 -167.8239 0.1590546 10.880 TRIG_00585149 Foreground time interval of the image: 0.076 1.588 (delta_t = 1.512 [sec]) Background time interval of the image: -239.024 0.076 (delta_t = 239.100 [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 0.076 sec. to 1.588 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.23046 ( -0.349509 0.313109 ) Norm@50keV : 4.95524E-03 ( -0.00118635 0.0011448 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.33 using 59 PHA bins. # Reduced chi-squared = 0.8655 for 57 degrees of freedom # Null hypothesis probability = 7.548599e-01 Photon flux (15-150 keV) in 1.512 sec: 0.833805 ( -0.126294 0.126305 ) ph/cm2/s Energy fluence (15-150 keV) : 7.07754e-08 ( -1.37863e-08 1.44192e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.076 sec. to 1.588 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.42152 ( 1.99215 1.99215 ) Epeak [keV] : 166.688 ( ) Norm@50keV : 3.88569E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 49.15 using 59 PHA bins. # Reduced chi-squared = 0.8777 for 56 degrees of freedom # Null hypothesis probability = 7.297829e-01 Photon flux (15-150 keV) in 1.512 sec: 0.786487 ( -0.247023 0.172706 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.172 sec. to 1.172 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.23226 ( -0.380537 0.336411 ) Norm@50keV : 5.38541E-03 ( -0.00143247 0.00138874 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.21 using 59 PHA bins. # Reduced chi-squared = 1.162 for 57 degrees of freedom # Null hypothesis probability = 1.889799e-01 Photon flux (15-150 keV) in 1 sec: 0.907061 ( -0.154377 0.154409 ) ph/cm2/s Energy fluence (15-150 keV) : 5.08862e-08 ( -1.10819e-08 1.16455e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.172 sec. to 1.172 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.22547 ( -0.65062 0.337921 ) Epeak [keV] : 9999.36 ( ) Norm@50keV : 5.41104E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 66.21 using 59 PHA bins. # Reduced chi-squared = 1.182 for 56 degrees of freedom # Null hypothesis probability = 1.650829e-01 Photon flux (15-150 keV) in 1 sec: 0.897300 ( -0.149957 0.15776 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 1.36 sec. Hardness ratio (energy fluence ratio) = 0.852413039729
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 4.164537e-08 S(50-150 keV) = 2.9129223e-08
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 = -2.396429390421482E-01, IMY = 5.170811366039454E-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: -239.024000 0.076000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.2823 35.3533 685.5 48.0 22.0 0.0114 0.0 8.6 Her X-1 268.3922 -1.4970 20.9 52.0 -29.6 0.3624 0.6 3.0 SW J1753.5-0127 288.8218 10.9649 0.9 28.6 -37.2 3.5000 13.2 1.8 GRS 1915+105 299.5899 35.2132 1.5 11.5 29.8 1.6244 7.6 0.7 Cyg X-1 308.0879 40.9509 1.1 11.3 75.6 2.2732 10.1 1.0 Cyg X-3 326.0071 38.3209 8.2 14.4 140.8 0.3163 1.4 7.7 Cyg X-2 323.9530 52.4656 2.3 24.2 108.1 1.5176 5.0 ------ UNKNOWN 258.9432 31.7826 2.8 44.9 16.1 1.8256 4.1 ------ UNKNOWN 255.0908 25.6421 2.6 49.8 9.3 2.7224 4.4 ------ UNKNOWN 261.4971 26.3331 2.5 44.1 7.8 1.8100 4.6 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: 0.076000 1.588000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 254.5009 35.4477 3.7 47.8 22.1 0.1348 3.1 6.7 Her X-1 268.5054 -1.4368 4.4 51.8 -29.7 -0.1138 -2.6 8.3 SW J1753.5-0127 288.8396 10.9682 6.6 28.6 -37.2 0.0316 1.7 2.8 GRS 1915+105 299.4027 35.2333 17.3 11.6 29.6 0.0096 0.7 9.4 Cyg X-1 308.0079 41.0996 6.3 11.5 75.5 -0.0287 -1.8 10.0 Cyg X-3 326.3828 38.4434 0.0 14.7 141.0 -0.0179 -1.1 12.3 Cyg X-2 267.3888 53.0590 1.8 39.5 48.4 0.2229 6.4 ------ UNKNOWN 313.2394 60.3281 2.1 30.3 91.2 0.1380 5.4 ------ UNKNOWN 326.7640 26.2147 1.1 13.8 -167.8 0.1590 10.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 50.876600 963.026200 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 288.7975 10.9371 0.9 38.9 -35.3 12.6364 13.3 0.5 GRS 1915+105 299.5972 35.1897 1.2 24.9 8.3 6.5042 9.7 0.8 Cyg X-1 308.1038 40.9674 0.8 21.3 29.0 9.3281 13.7 0.9 Cyg X-3 326.1380 38.2304 4.7 12.0 68.3 -1.4258 -2.4 5.7 Cyg X-2 279.5364 60.6471 4.9 46.9 41.1 6.7762 2.4 ------ UNKNOWN 272.0986 18.2604 3.1 50.9 -16.6 5.0836 3.7 ------ UNKNOWN 266.6173 15.3665 3.8 56.8 -17.7 7.6670 3.0 ------ UNKNOWN 319.0853 -14.2760 5.6 41.2 -98.1 8.4250 2.1 ------ UNKNOWN