batgrbproduct Analysis for Trigger=335647
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 v2.42
Process Start Time (local time): Thu Nov 27 08:21:37 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger335647/GCN5_download_cron
======================================================================
Trigger: 00335647 Segment: 000
BAT Trigger Time: 249428053.568 [s; MET]
Trigger Stop: 249428054.592 [s; MET]
UTC: 2008-11-26T21:34:10.280820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 323.541872169791 Dec: 48.7093541229447 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.45
Image Trigger?: NO
Rate S/N Ratio: 44.2831796509691 [ if not an image trigger ]
Image S/N Ratio: 14.45
Flight Position: [ source = BAT ]
RA: 323.541872169791 Dec: 48.7093541229447 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 323.526982306813 Dec: 48.7127998308125 [deg; J2000]
{ 21h 34m 06.5s , +48d 42' 46.1" }
+/- 0.845239655136886 [arcmin] (estimated 90% radius based on SNR)
+/- 0.302081062052052 [arcmin] (formal 1-sigma fit error)
SNR: 38.6752259621199
Angular difference between Flight and Ground position is 0.624712 arcmin
Partial Coding Fraction: 0.6796875 [ including projection effects ]
Duration
T90: 55.8040000200272 +/- 5.34971737754176
Measured from: -17.7319999039173
to: 38.0720001161098 [s; relative to TRIGTIME]
T50: 31.4759999811649 +/- 0.452548329844147
Measured from: -0.163999885320663
to: 31.3120000958443 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.752000004053116
to: 1.75200000405312 [s; relative to TRIGTIME]
Total Fluence
Measured from: -21.4239999949932
to: 60.3200000226498 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.153926 1.839563 1.629150 0.461934
0.053954 0.054886 0.049037 0.040771 [error]
Peak 0.090101 0.165825 0.168964 0.055276
0.007748 0.008792 0.008836 0.006551 [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 3.51e-07 7.42e-07 1.23e-06 4.61e-06 3.39e-06 6.92e-06 erg/cm2
Error 2.44e-08 2.99e-08 4.90e-08 4.28e-07 1.23e-07 4.52e-07 erg/cm2
Peak flux Power-law 8.65e-01 1.14e+00 1.09e+00 1.88e+00 3.72e+00 4.97e+00 ph/cm2/s
Error 9.72e-02 7.70e-02 6.93e-02 2.58e-01 2.12e-01 3.11e-01 ph/cm2/s
Fluence Cutoff-PL 3.28e-07 7.55e-07 1.26e-06 3.18e-06 3.33e-06 5.54e-06 erg/cm2
Error 3.14e-08 3.25e-08 5.68e-08 1.05e-06 1.35e-07 1.05e-06 erg/cm2
Peak flux Cutoff-PL 8.15e-01 1.15e+00 1.13e+00 1.46e+00 3.68e+00 4.56e+00 ph/cm2/s
Error 1.24e-01 8.31e-02 8.57e-02 5.41e-01 2.19e-01 5.87e-01 ph/cm2/s
Fluence Band 3.25e-07 7.52e-07 1.26e-06 3.18e-06 3.33e-06 5.52e-06 erg/cm2
Error 3.11e-08 3.24e-08 5.67e-08 1.05e-06 1.35e-07 1.05e-06 erg/cm2
Peak flux Band 8.15e-01 1.15e+00 1.13e+00 1.46e+00 3.68e+00 4.56e+00 ph/cm2/s
Error 1.24e-01 8.32e-02 6.52e-02 5.41e-01 2.19e-01 5.87e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.273 0.063 - - 4.16e-03 1.40e-04 46.888 57
CPL 0.997 0.258 203.3 912.7 5.55e-03 1.49e-03 43.286 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.054 0.099 - - 3.22e-02 1.80e-03 59.445 57
CPL 0.814 0.366 280.9 5000.0 4.13e-02 1.61e-02 58.346 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: 51.328000 sec.
T50 in the 50-300 keV band: 30.912000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 81.744 -21.424 60.320
T90 55.804 -17.732 38.072
T50 31.476 -0.164 31.312
Peak 1.000 0.752 1.752
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
323.5270 +48.7128 0.0050 19.9 73.0 3.0149 38.7 TRIG_00335647
------------------------------------------
Foreground time interval of the image:
-21.424 11.033 (delta_t = 32.457 [sec])
Background time interval of the image:
-239.568 -159.588 (delta_t = 79.980 [sec])
-119.568 -21.424 (delta_t = 98.144 [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 -21.424 sec. to 60.320 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27315 ( -6.280601E-02 6.255031E-02) )
Norm@50keV : 4.163061E-03 ( -1.404868E-04 1.404537E-04) )
------------------------------------------------------------
Chi-Squared = 46.88840 using 59 PHA bins.
Reduced chi-squared = 0.8226035 for 57 degrees of freedom
Null hypothesis probability = 0.828
Photon flux (15-150 keV) in 81.74 sec: 0.494289 ( -0.017816 0.017858 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.38528e-06 ( -1.22929e-07 1.23346e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -21.424 sec. to 60.320 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.997269 ( -0.270338 0.246481 )
Epeak [keV] : 203.299 ( -73.4384 1752.06 )
Norm@50keV : 5.547578E-03 ( -1.227287E-03 1.745046E-03) )
------------------------------------------------------------
Chi-Squared = 43.28647 using 59 PHA bins.
but latest trial 1.24397 gives Chi-Squared = 2.74917
Reduced chi-squared = 0.7729727 for 56 degrees of freedom
Null hypothesis probability = 0.893
Photon flux (15-150 keV) in 81.74 sec: 0.485707 ( -0.019269 0.019321 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.32735e-06 ( -1.34912e-07 1.34724e-07 ) ergs/cm2
Band function
Time interval is from -21.424 sec. to 60.320 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.776305 ( -0.359818 1.17829 )
beta : -1.42306 ( -8.57694 0.146680 )
Epeak [keV] : 117.947 ( -71.0593 599.367 )
Norm@50keV : 7.381363E-03 ( -2.949092E-03 1.513388E-02) )
------------------------------------------------------------
Chi-Squared = 42.72791 using 59 PHA bins.
Reduced chi-squared = 0.7768711 for 55 degrees of freedom
Null hypothesis probability = 0.886
Photon flux (15-150 keV) in 81.74 sec: 0.483677 ( -0.019981 0.019593 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.32525e-06 ( -1.35075e-07 1.34503e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.752 sec. to 1.752 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05363 ( -9.902215E-02 9.839344E-02) )
Norm@50keV : 3.218459E-02 ( -1.802955E-03 1.801945E-03) )
------------------------------------------------------------
Chi-Squared = 59.44513 using 59 PHA bins.
Reduced chi-squared = 1.042897 for 57 degrees of freedom
Null hypothesis probability = 0.387
Photon flux (15-150 keV) in 1.000 sec: 3.71817 ( -0.21195 0.21222 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.41652e-07 ( -2.1461e-08 2.1566e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.752 sec. to 1.752 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.813942 ( -0.420095 0.311708 )
Epeak [keV] : 280.924 ( -280.914 9719.08 )
Norm@50keV : 4.133070E-02 ( -1.037897E-02 2.177756E-02) )
------------------------------------------------------------
Chi-Squared = 58.34597 using 59 PHA bins.
Reduced chi-squared = 1.041892 for 56 degrees of freedom
Null hypothesis probability = 0.389
Photon flux (15-150 keV) in 1.000 sec: 3.68316 ( -0.21867 0.21916 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.37935e-07 ( -2.2788e-08 2.2275e-08 ) ergs/cm2
Band function
Time interval is from 0.752 sec. to 1.752 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.828240 ( -9.17176 5.81972 )
beta : -1.05363 ( -8.73224 0.286768 )
Epeak [keV] : 72.9396 ( -214.356 9785.54 )
Norm@50keV : 5.369431E-02 ( -1.433010E-02 1104.76 )
------------------------------------------------------------
Chi-Squared = 59.44514 using 59 PHA bins.
Reduced chi-squared = 1.080821 for 55 degrees of freedom
Null hypothesis probability = 0.317
Photon flux (15-150 keV) in 1.000 sec: 3.68331 ( -0.21942 0.21898 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.37698e-07 ( -2.2764e-08 2.25e-08 ) ergs/cm2
Plot creation:
Thu Nov 27 08:41:43 EST 2008