batgrbproduct Analysis for Trigger=209352
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 v2.41
Process Start Time (local time): Tue Jan 1 11:49:51 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger209352/SDC
======================================================================
Trigger: 00209352 Segment: 000
BAT Trigger Time: 168942136 [s; MET]
Trigger Stop: 168942200 [s; MET]
UTC: 2006-05-10T08:22:14.815740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 239.141458616034 Dec: 78.5593987782931 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.54
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.54
Flight Position: [ source = BAT ]
RA: 239.141458616034 Dec: 78.5593987782931 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 239.25557390084 Dec: 78.5835095016627 [deg; J2000]
{ 15h 57m 01.3s , +78d 35' 00.6" }
+/- 1.88793031832228 [arcmin] (estimated 90% radius based on SNR)
+/- 0.802029874326253 [arcmin] (formal 1-sigma fit error)
SNR: 12.270230512556
RA = 15h 57m 1.3s (239.255574 deg.)
Dec = 78d 35' 1" (78.583510 deg.)
Angular difference between Flight and Ground position is 1.983274 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 270.736000031233 +/- 21.2895454410942
Measured from: 30.9639999866486
to: 301.700000017881 [s; relative to TRIGTIME]
T50: 132.532000005245 +/- 16.7751321852205
Measured from: 111.67199999094
to: 244.203999996185 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 136.236000001431
to: 137.236000001431 [s; relative to TRIGTIME]
Total Fluence
Measured from: -16.2800000011921
to: 325.011999994516 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.645259 2.779920 1.718553 0.267180
0.084297 0.085814 0.075906 0.067435 [error]
Peak 0.025029 0.023450 0.020035 0.007803
0.004874 0.004889 0.004413 0.003695 [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 7.28e-07 1.14e-06 1.35e-06 3.08e-06 4.11e-06 6.29e-06 erg/cm2
Error 5.55e-08 4.82e-08 7.82e-08 4.04e-07 1.78e-07 4.52e-07 erg/cm2
Peak flux Power-law 1.77e-01 1.87e-01 1.41e-01 1.72e-01 5.71e-01 6.77e-01 ph/cm2/s
Error 6.09e-02 3.93e-02 3.62e-02 9.37e-02 1.12e-01 1.39e-01 ph/cm2/s
Fluence Cutoff-PL 7.07e-07 1.15e-06 1.36e-06 2.51e-06 4.07e-06 5.63e-06 erg/cm2
Error 7.00e-08 5.37e-08 8.04e-08 9.20e-07 2.07e-07 9.60e-07 erg/cm2
Peak flux Cutoff-PL 1.77e-01 1.88e-01 1.41e-01 1.70e-01 5.70e-01 6.76e-01 ph/cm2/s
Error 6.09e-02 3.93e-02 3.62e-02 9.31e-02 1.12e-01 1.39e-01 ph/cm2/s
Fluence Band 7.02e-07 1.15e-06 1.35e-06 2.51e-06 4.06e-06 5.69e-06 erg/cm2
Error 6.92e-08 5.44e-08 8.15e-08 9.28e-07 2.10e-07 9.33e-07 erg/cm2
Peak flux Band 1.73e-01 1.93e-01 1.40e-01 1.63e-01 5.71e-01 6.74e-01 ph/cm2/s
Error 5.84e-02 4.30e-02 2.94e-02 9.72e-02 1.11e-01 1.43e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.761 0.083 - - 1.31e-03 5.44e-05 35.580 57
CPL 1.494 0.289 96.1 0.0 1.76e-03 4.93e-04 35.517 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.413 0.361 - - 4.67e-03 9.42e-04 61.788 57
CPL 1.381 1.419 944.0 0.0 4.86e-03 9.49e-04 61.815 56
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: 264.896000 sec.
T50 in the 50-300 keV band: 111.424000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 341.292 -16.280 325.012
T90 270.736 30.964 301.700
T50 132.532 111.672 244.204
Peak 1.000 136.236 137.236
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
239.2556 +78.5835 0.0157 12.0 -112.3 1.2434 12.3 TRIG_00209352
------------------------------------------
Foreground time interval of the image:
-16.280 76.805 (delta_t = 93.085 [sec])
Background time interval of the image:
-195.595 -16.280 (delta_t = 179.315 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -16.280 sec. to 325.012 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76104 ( -8.256328E-02 8.332276E-02) )
Norm@50keV : 1.306815E-03 ( -5.452847E-05 5.422754E-05) )
------------------------------------------------------------
Chi-Squared = 35.57998 using 59 PHA bins.
Reduced chi-squared = 0.6242101 for 57 degrees of freedom
Null hypothesis probability = 0.988
Photon flux (15-150 keV) in 341.3 sec: 0.177428 ( -0.007682 0.007721 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.11314e-06 ( -1.77271e-07 1.77988e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -16.280 sec. to 325.012 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.49411 ( -0.229659 0.348551 )
Epeak [keV] : 96.0609 ( )
Norm@50keV : 1.763671E-03 ( -2.733014E-04 7.121888E-04) )
------------------------------------------------------------
Chi-Squared = 35.51658 using 59 PHA bins.
but latest trial 59.8155 gives Chi-Squared = 8.61542
but latest trial 1.180364E-03 gives Chi-Squared = 15.2349
Reduced chi-squared = 0.6342247 for 56 degrees of freedom
Null hypothesis probability = 0.985
Photon flux (15-150 keV) in 341.3 sec: 0.175491 ( -0.008786 0.008721 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.06696e-06 ( -2.12835e-07 2.00889e-07 ) ergs/cm2
Band function
Time interval is from -16.280 sec. to 325.012 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.45924 ( -0.370591 11.3395 )
beta : -1.76088 ( -8.343351E-02 8.250117E-02) )
Epeak [keV] : 33.1012 ( -33.0012 9966.90 )
Norm@50keV : 2.386912E-03 ( -7.412076E-03 7.378191E-03) )
------------------------------------------------------------
Chi-Squared = 35.59359 using 59 PHA bins.
Reduced chi-squared = 0.6471561 for 55 degrees of freedom
Null hypothesis probability = 0.980
Photon flux (15-150 keV) in 341.3 sec: 0.175485 ( -0.008819 0.008825 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.06092e-06 ( -2.11299e-07 2.08295e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 136.236 sec. to 137.236 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41262 ( -0.360560 0.362134 )
Norm@50keV : 4.672289E-03 ( -9.500959E-04 9.334725E-04) )
------------------------------------------------------------
Chi-Squared = 61.78831 using 59 PHA bins.
Reduced chi-squared = 1.084005 for 57 degrees of freedom
Null hypothesis probability = 0.309
Photon flux (15-150 keV) in 1.000 sec: 0.570651 ( -0.112135 0.112276 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.50105e-08 ( -1.01776e-08 1.04696e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 136.236 sec. to 137.236 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38072 ( -1.32613 1.51195 )
Epeak [keV] : 943.959 ( )
Norm@50keV : 4.862226E-03 ( -9.588664E-04 9.382362E-04) )
------------------------------------------------------------
Chi-Squared = 61.81528 using 59 PHA bins.
Reduced chi-squared = 1.103844 for 56 degrees of freedom
Null hypothesis probability = 0.276
Photon flux (15-150 keV) in 1.000 sec: 0.570486 ( -0.112102 0.112246 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.50465e-08 ( -1.02045e-08 1.04456e-08 ) ergs/cm2
Band function
Time interval is from 136.236 sec. to 137.236 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.964579 ( -9.03542 5.96458 )
beta : -1.43151 ( -8.56849 0.374855 )
Epeak [keV] : 59.7616 ( -59.6616 9931.07 )
Norm@50keV : 9.997467E-03 ( -41.2365 428.915 )
------------------------------------------------------------
Chi-Squared = 61.72558 using 59 PHA bins.
Reduced chi-squared = 1.122283 for 55 degrees of freedom
Null hypothesis probability = 0.248
Photon flux (15-150 keV) in 1.000 sec: 0.570536 ( -0.110925 0.111798 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.48931e-08 ( -1.08241e-08 1.00152e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 12:02:44 EST 2008