batgrbproduct Analysis for Trigger=208654
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): Mon Dec 31 22:29:39 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger208654/GCN5_download_hand
======================================================================
Trigger: 00208654 Segment: 000
BAT Trigger Time: 168503761.936 [s; MET]
Trigger Stop: 168503762.384 [s; MET]
UTC: 2006-05-05T06:36:00.767100 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 64 ms to TRIGTIME + 320 ms
BAT
RA: 331.765 Dec: -27.819 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.47
Image Trigger?: NO
Rate S/N Ratio: 32.9696830436691 [ if not an image trigger ]
Image S/N Ratio: 11.47
Flight Position: [ source = BAT ]
RA: 331.765 Dec: -27.819 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 331.715823478508 Dec: -27.8696556540741 [deg; J2000]
{ 22h 06m 51.8s , -27d 52' 10.8" }
+/- 3.2675287019851 [arcmin] (estimated 90% radius based on SNR)
+/- 1.78778760425136 [arcmin] (formal 1-sigma fit error)
SNR: 5.60427220522598
RA = 22h 6m 51.8s (331.715823 deg.)
Dec = -27d 52' 11" (-27.869656 deg.)
Angular difference between Flight and Ground position is 4.005535 arcmin
Partial Coding Fraction: 0.1113281 [ including projection effects ]
Duration
T90: 0.448000013828278 +/- 1.4142135623731
Measured from: 0
to: 0.448000013828278 [s; relative to TRIGTIME]
T50: 0.448000013828278 +/- 1
Measured from: 0
to: 0.448000013828278 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.448000013828278 second)
Measured from: 0
to: 0.448000013828278 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.448000013828278 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.018733 0.063583 0.061402 -0.000531
0.012698 0.015088 0.016862 0.017714 [error]
Peak 0.018733 0.063583 0.061402 -0.000531
0.012698 0.015088 0.016862 0.017714 [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 1.08e-08 2.32e-08 3.89e-08 1.49e-07 1.07e-07 2.28e-07 erg/cm2
Error 6.19e-09 8.24e-09 1.49e-08 1.56e-07 3.75e-08 1.38e-07 erg/cm2
Peak flux Power-law 7.74e-01 9.04e-01 7.60e-01 1.08e+00 2.82e+00 3.52e+00 ph/cm2/s
Error 4.51e-01 3.30e-01 2.82e-01 8.45e-01 9.21e-01 1.17e+00 ph/cm2/s
Fluence Cutoff-PL 8.66e-09 2.50e-08 4.34e-08 5.42e-08 1.04e-07 1.39e-07 erg/cm2
Error 7.33e-09 9.92e-09 1.88e-08 1.45e-07 3.94e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 6.09e-01 9.62e-01 8.55e-01 4.96e-01 2.74e+00 2.92e+00 ph/cm2/s
Error 5.32e-01 3.89e-01 3.68e-01 9.90e-01 9.43e-01 1.38e+00 ph/cm2/s
Fluence Band 8.42e-09 2.50e-08 4.33e-08 5.33e-08 1.04e-07 1.22e-07 erg/cm2
Error 7.25e-09 9.98e-09 1.88e-08 1.45e-07 3.95e-08 0.00e+00 erg/cm2
Peak flux Band 6.09e-01 9.62e-01 8.55e-01 4.96e-01 2.74e+00 2.92e+00 ph/cm2/s
Error 5.32e-01 3.89e-01 3.69e-01 9.90e-01 9.42e-01 1.38e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.250 0.562 - - 2.39e-02 7.58e-03 51.516 57
CPL 0.273 3.152 99.3 5000.0 6.68e-02 1.06e+00 51.002 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.250 0.562 - - 2.39e-02 7.58e-03 51.516 57
CPL 0.273 3.070 99.3 5000.0 6.68e-02 1.06e+00 51.002 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.448 0.000 0.448
T90 0.448 0.000 0.448
T50 0.448 0.000 0.448
Peak 0.448 0.000 0.448
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
331.7158 -27.8697 0.0344 49.8 22.2 0.1861 5.6 TRIG_00208654
------------------------------------------
Foreground time interval of the image:
-0.064 0.384 (delta_t = 0.448 [sec])
Background time interval of the image:
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 -0.064 sec. to 0.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25009 ( -0.556277 0.566851 )
Norm@50keV : 2.387522E-02 ( -7.586166E-03 7.582519E-03) )
------------------------------------------------------------
Chi-Squared = 51.51617 using 59 PHA bins.
Reduced chi-squared = 0.9037924 for 57 degrees of freedom
Null hypothesis probability = 0.680
Photon flux (15-150 keV) in 0.4480 sec: 2.82379 ( -0.91829 0.92357 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07151e-07 ( -3.73005e-08 3.77413e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.064 sec. to 0.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.272819 ( -3.27282 3.03146 )
Epeak [keV] : 99.3249 ( -99.3149 9900.67 )
Norm@50keV : 6.684344E-02 ( -6.684344E-02 2.06148 )
------------------------------------------------------------
Chi-Squared = 51.00195 using 59 PHA bins.
Reduced chi-squared = 0.9107491 for 56 degrees of freedom
Null hypothesis probability = 0.664
Photon flux (15-150 keV) in 0.4480 sec: 2.73522 ( -0.93871 0.94652 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0391e-07 ( -3.93752e-08 3.9398e-08 ) ergs/cm2
Band function
Time interval is from -0.064 sec. to 0.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.268284 ( -9.73172 2.31380 )
beta : -8.90561 ( -1.09439 8.15021 )
Epeak [keV] : 99.0328 ( -45.6890 9900.97 )
Norm@50keV : 6.720381E-02 ( -6.720380E-02 2.63193 )
------------------------------------------------------------
Chi-Squared = 51.00194 using 59 PHA bins.
Reduced chi-squared = 0.9273080 for 55 degrees of freedom
Null hypothesis probability = 0.628
Photon flux (15-150 keV) in 0.4480 sec: 2.73521 ( -0.93757 0.94669 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0374e-07 ( -3.9471e-08 3.95132e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.064 sec. to 0.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25009 ( -0.556277 0.566851 )
Norm@50keV : 2.387522E-02 ( -7.586166E-03 7.582519E-03) )
------------------------------------------------------------
Chi-Squared = 51.51617 using 59 PHA bins.
Reduced chi-squared = 0.9037924 for 57 degrees of freedom
Null hypothesis probability = 0.680
Photon flux (15-150 keV) in 0.4480 sec: 2.82379 ( -0.91829 0.92357 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07151e-07 ( -3.73005e-08 3.77413e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.064 sec. to 0.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.272819 ( -3.27282 2.86765 )
Epeak [keV] : 99.3249 ( -99.3149 9900.67 )
Norm@50keV : 6.684344E-02 ( -6.684344E-02 2.06148 )
------------------------------------------------------------
Chi-Squared = 51.00195 using 59 PHA bins.
Reduced chi-squared = 0.9107491 for 56 degrees of freedom
Null hypothesis probability = 0.664
Photon flux (15-150 keV) in 0.4480 sec: 2.73522 ( -0.93871 0.94652 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0391e-07 ( -3.93752e-08 3.9398e-08 ) ergs/cm2
Band function
Time interval is from -0.064 sec. to 0.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.268284 ( -9.73172 2.31380 )
beta : -8.90561 ( -1.09439 8.15021 )
Epeak [keV] : 99.0328 ( -45.6890 9900.97 )
Norm@50keV : 6.720381E-02 ( -6.720380E-02 2.63193 )
------------------------------------------------------------
Chi-Squared = 51.00194 using 59 PHA bins.
Reduced chi-squared = 0.9273080 for 55 degrees of freedom
Null hypothesis probability = 0.628
Photon flux (15-150 keV) in 0.4480 sec: 2.73521 ( -0.93757 0.94669 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0374e-07 ( -3.9471e-08 3.95132e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 22:35:56 EST 2007