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 GROUND-DETECTED GRB DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time: Mon Apr 13 01:28:20 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
======================================================================
Trigger: 00509285 Segment: 000
BAT Trigger Time: 345025696.0
UTC: 2011-12-08T08:28:08.346 [includes UTCF correction]
Where From?: Ground analysis (best_duration.txt)
NOTE: BAT trigger time for ground-detected burst is the T100 start time.
Refined Position: [ source = BAT pre-slew image ]
RA: 290.217550597 Dec: 40.6752729429 [deg; J2000]
{ 19h 20m 52.2s , +40d 40' 31.0" }
+/- 2.38401380316 [arcmin] (estimated 90% radius based on SNR)
SNR: 8.79351837437
Angular difference between the analysis and refined position is Usage: arcmin
Partial Coding Fraction: 0.06738281 [ including projection effects ]
Duration
T90: 168. +/- 1.6
Measured from: 8
to: 176 [s; relative to TRIGTIME]
T50: 92.8000000715256 +/- 1.6
Measured from: 46.4
to: 139.2 [s; relative to TRIGTIME]
====== Table of the duration information =============================
Value tstart tstop
T100 184.000 0.000 184.000
T90 168.000 8.000 176.000
T50 92.800 46.400 139.200
Peak 1.000 129.900 130.900
====== 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 -1.547 -0.292 0.291 - - - 1.01e-02 -1.80e-03 1.80e-03 53.170 57
CPL -0.783 -0.962 1.402 84.332 -30.383 -84.332 2.37e-02 -1.48e-02 8.36e-02 51.830 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 N/A N/A N/A - - - N/A N/A N/A N/A N/A
CPL N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
=== 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 1.36e-07 2.43e-07 3.32e-07 9.41e-07 9.59e-07 1.65e-06 erg/cm2
90%_error_low -3.99e-08 -4.72e-08 -7.18e-08 -3.66e-07 -1.78e-07 -4.35e-07 erg/cm2
90%_error_hi 4.35e-08 4.65e-08 7.07e-08 4.87e-07 1.79e-07 5.23e-07 erg/cm2
Peak flux PL N/A N/A N/A N/A N/A N/A ph/cm2/s
Image
15.0-350.0 keV image (Event data)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name 290.218 40.675 0.022 52.426 160.880 1.474 8.794 TRIG_00509285 Image time interval: 4.000 to 14.080 [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.
Best duration plot
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 4.000 sec. to 14.080 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.54729 ( -0.292153 0.290772 ) Norm@50keV : 1.00971E-02 ( -0.00179828 0.00179543 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 53.17 using 59 PHA bins. # Reduced chi-squared = 0.9328 for 57 degrees of freedom # Null hypothesis probability = 6.194690e-01 Photon flux (15-150 keV) in 10.08 sec: 1.27728 ( -0.24017 0.24188 ) ph/cm2/s Energy fluence (15-150 keV) : 9.58651e-07 ( -1.78174e-07 1.7903e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.000 sec. to 14.080 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.782933 ( -0.96177 1.40197 ) Epeak [keV] : 84.3322 ( -30.3828 -84.3323 ) Norm@50keV : 2.36810E-02 ( -0.0148272 0.0835676 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 51.83 using 59 PHA bins. # Reduced chi-squared = 0.9256 for 56 degrees of freedom # Null hypothesis probability = 6.331976e-01 Photon flux (15-150 keV) in 10.08 sec: 1.24085 ( -0.245428 0.24756 ) ph/cm2/s Energy fluence (15-150 keV) : 9.30016e-07 ( -1.85232e-07 1.85204e-07 ) ergs/cm2
1-s peak spectrum fit
1-s peak spectrum unavailable, likely because there are no event data in the 1-s peak range.
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 168.0 sec. Hardness ratio (energy fluence ratio) = 1.36864265617
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 3.784012e-07 S(50-150 keV) = 5.802677e-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 = -1.22803812369, IMY = -0.425725634515
Spacecraft aspect plot
Bright source in the event data image
Event data image of 15-350 keV band
Time interval of the image: 4.000000 14.080000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.8979 -15.6460 2.4 37.2 -91.2 0.4562 4.9 4.7 Sco X-1 254.4827 35.3459 7.5 24.3 153.4 0.0585 1.5 1.2 Her X-1 268.3005 -1.5140 3.9 40.4 -134.7 0.1785 2.9 5.5 SW J1753.5-0127 288.8668 11.0197 8.3 54.1 -161.9 0.1554 1.4 6.0 GRS 1915+105 179.8129 26.6670 2.1 49.3 36.2 0.8040 5.4 ------ UNKNOWN 290.2175 40.6753 1.3 52.4 160.9 1.4717 8.7 ------ UNKNOWN
Webpage updated on: Wed Apr 22 21:02:40 EDT 2015