batgrbproduct Analysis for Trigger=350479
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.44
Process Start Time (local time): Mon Apr 27 06:03:53 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger350479/GCN5_download_cron
======================================================================
Trigger: 00350479 Segment: 000
BAT Trigger Time: 262442931.904 [s; MET]
Trigger Stop: 262442932.416 [s; MET]
UTC: 2009-04-26T12:48:47.212900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 189.090930330315 Dec: 32.9656829712553 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.03
Image Trigger?: NO
Rate S/N Ratio: 15.2643375224737 [ if not an image trigger ]
Image S/N Ratio: 8.03
Flight Position: [ source = BAT ]
RA: 189.090930330315 Dec: 32.9656829712553 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 189.08206438603 Dec: 32.9779425668874 [deg; J2000]
{ 12h 36m 19.7s , +32d 58' 40.6" }
+/- 1.68692003972364 [arcmin] (estimated 90% radius based on SNR)
+/- 0.677981681261413 [arcmin] (formal 1-sigma fit error)
SNR: 14.4111178372391
Angular difference between Flight and Ground position is 0.860370 arcmin
Partial Coding Fraction: 0.3203125 [ including projection effects ]
Duration
T90: 1.24800002574921 +/- 0.257899207291378
Measured from: 0.0200000703334808
to: 1.26800009608269 [s; relative to TRIGTIME]
T50: 0.436000019311905 +/- 0.199278679634784
Measured from: 0.300000071525574
to: 0.736000090837479 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0340000092983246
to: 0.965999990701675 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0320000052452087
to: 1.33999997377396 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.116658 0.118058 0.070255 0.017984
0.013090 0.013340 0.011752 0.009327 [error]
Peak 0.093849 0.100118 0.059583 0.022221
0.011470 0.011866 0.010350 0.008015 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== 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 Power-law 3.77e-08 5.33e-08 5.58e-08 1.08e-07 1.81e-07 2.55e-07 erg/cm2
Error 6.59e-09 6.54e-09 1.11e-08 4.24e-08 2.61e-08 5.45e-08 erg/cm2
Peak flux Power-law 9.71e-01 7.98e-01 4.44e-01 3.64e-01 2.38e+00 2.58e+00 ph/cm2/s
Error 1.86e-01 1.03e-01 8.51e-02 1.34e-01 3.09e-01 3.35e-01 ph/cm2/s
Fluence Cutoff-PL 3.56e-08 5.74e-08 5.61e-08 4.40e-08 1.73e-07 1.85e-07 erg/cm2
Error 7.38e-09 8.85e-09 1.25e-08 6.31e-08 2.82e-08 7.24e-08 erg/cm2
Peak flux Cutoff-PL 9.23e-01 8.43e-01 4.54e-01 2.10e-01 2.35e+00 2.43e+00 ph/cm2/s
Error 2.10e-01 1.36e-01 9.33e-02 1.77e-01 3.12e-01 3.89e-01 ph/cm2/s
Fluence Band 3.55e-08 5.72e-08 5.58e-08 5.41e-08 1.75e-07 2.06e-07 erg/cm2
Error 6.92e-09 9.01e-09 1.31e-08 2.16e-08 6.72e-08 0.00e+00 erg/cm2
Peak flux Band 9.30e-01 8.47e-01 4.36e-01 3.21e-01 2.36e+00 2.53e+00 ph/cm2/s
Error 2.34e-01 1.39e-01 8.60e-02 2.19e-01 3.06e-01 4.09e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.931 0.220 - - 1.43e-02 2.11e-03 58.825 57
CPL 1.339 0.912 49.3 5000.0 3.07e-02 5.06e-02 57.391 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.845 0.224 - - 1.69e-02 2.51e-03 65.147 57
CPL 1.397 0.909 60.8 5000.0 3.00e-02 4.91e-02 64.370 0
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.576000 sec.
T50 in the 50-300 keV band: 0.256000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.372 -0.032 1.340
T90 1.248 0.020 1.268
T50 0.436 0.300 0.736
Peak 1.000 -0.034 0.966
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
189.0821 +32.9779 0.0133 38.9 28.2 0.3446 14.4 TRIG_00350479
------------------------------------------
Foreground time interval of the image:
-0.032 1.340 (delta_t = 1.372 [sec])
Background time interval of the image:
-239.904 -0.032 (delta_t = 239.872 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 5) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of 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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.032 sec. to 1.340 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93138 ( -0.212624 0.226543 )
Norm@50keV : 1.432212E-02 ( -2.138155E-03 2.083679E-03) )
------------------------------------------------------------
Chi-Squared = 58.82495 using 59 PHA bins.
Reduced chi-squared = 1.032017 for 57 degrees of freedom
Null hypothesis probability = 0.408
Photon flux (15-150 keV) in 1.372 sec: 2.08331 ( -0.257 0.2571 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80666e-07 ( -2.57909e-08 2.64055e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 1.340 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33939 ( -1.01124 0.812093 )
Epeak [keV] : 49.2551 ( -49.2451 9950.75 )
Norm@50keV : 3.074309E-02 ( -1.954509E-02 8.160237E-02) )
------------------------------------------------------------
Chi-Squared = 57.39098 using 59 PHA bins.
Reduced chi-squared = 1.024839 for 56 degrees of freedom
Null hypothesis probability = 0.423
Photon flux (15-150 keV) in 1.372 sec: 2.04730 ( -0.26214 0.26202 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.73086e-07 ( -2.79161e-08 2.84127e-08 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 1.340 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34440 ( -10.8209 4.15037 )
beta : -3.07319 ( -7.74071 11.7657 )
Epeak [keV] : 49.6690 ( -27.8933 550.149 )
Norm@50keV : 3.041813E-02 ( -49.0051 1722.65 )
------------------------------------------------------------
Chi-Squared = 57.38354 using 59 PHA bins.
Reduced chi-squared = 1.043337 for 55 degrees of freedom
Null hypothesis probability = 0.387
Photon flux (15-150 keV) in 1.372 sec: 2.04689 ( -0.25571 0.26058 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75252e-07 ( -1.56079e-08 2.76362e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.032 sec. to 0.964 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84478 ( -0.218245 0.230605 )
Norm@50keV : 1.693420E-02 ( -2.538411E-03 2.479179E-03) )
------------------------------------------------------------
Chi-Squared = 65.14692 using 59 PHA bins.
Reduced chi-squared = 1.142928 for 57 degrees of freedom
Null hypothesis probability = 0.214
Photon flux (15-150 keV) in 0.9960 sec: 2.37525 ( -0.30906 0.30922 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.55069e-07 ( -2.30016e-08 2.33821e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.964 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39715 ( -1.02441 0.792911 )
Epeak [keV] : 60.8272 ( -60.8172 9939.17 )
Norm@50keV : 2.998680E-02 ( -1.839339E-02 7.979645E-02) )
------------------------------------------------------------
Chi-Squared = 64.36951 using 59 PHA bins.
but latest trial 1.184361E-02 gives Chi-Squared = 11.2377
Reduced chi-squared = 1.149456 for 56 degrees of freedom
Null hypothesis probability = 0.207
Photon flux (15-150 keV) in 0.9960 sec: 2.34771 ( -0.31399 0.31014 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50235e-07 ( -2.50135e-08 2.51978e-08 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.964 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09299 ( -11.9100 2.83145 )
beta : -2.09561 ( -0.369412 0.287124 )
Epeak [keV] : 46.2774 ( -29.4653 284.837 )
Norm@50keV : 4.801604E-02 ( -13.9341 1882.48 )
------------------------------------------------------------
Chi-Squared = 64.20496 using 59 PHA bins.
Reduced chi-squared = 1.167363 for 55 degrees of freedom
Null hypothesis probability = 0.185
Photon flux (15-150 keV) in 0.9960 sec: 2.36114 ( -0.30384 0.3084 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53155e-07 ( -2.69129e-08 2.32397e-08 ) ergs/cm2
Plot creation:
Mon Apr 27 06:27:33 EDT 2009