batgrbproduct Analysis for Trigger=296856
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): Sat Dec 15 00:52:52 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger296856/GCN5_download_cron
======================================================================
Trigger: 00296856 Segment: 000
BAT Trigger Time: 217069040 [s; MET]
Trigger Stop: 217069104 [s; MET]
UTC: 2007-11-18T08:57:17.629920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 299.816804969612 Dec: 70.0928765899392 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.67
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.67
Flight Position: [ source = BAT ]
RA: 299.816804969612 Dec: 70.0928765899392 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 299.837961167562 Dec: 70.1302645027498 [deg; J2000]
{ 19h 59m 21.1s , +70d 07' 49.0" }
+/- 2.661713536364 [arcmin] (estimated 90% radius based on SNR)
+/- 1.3027504431185 [arcmin] (formal 1-sigma fit error)
SNR: 7.51181831589482
RA = 19h 59m 21.1s (299.837961 deg.)
Dec = 70d 7' 49" (70.130265 deg.)
Angular difference between Flight and Ground position is 2.284460 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 70.4639999866486 +/- 19.7274874172511
Measured from: 8.391999989748
to: 78.8559999763966 [s; relative to TRIGTIME]
T50: 32.0319999754429 +/- 19.3658767777891
Measured from: 23.3680000007153
to: 55.3999999761581 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 80.2599999904633
to: 81.2599999904633 [s; relative to TRIGTIME]
Total Fluence
Measured from: 4.53600001335144
to: 81.2400000095367 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.285738 0.325049 0.225152 0.011236
0.045177 0.046176 0.044317 0.046471 [error]
Peak 0.014753 0.009814 0.017327 0.000486
0.005065 0.005188 0.005053 0.005253 [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 7.73e-08 1.31e-07 1.70e-07 4.45e-07 5.01e-07 8.25e-07 erg/cm2
Error 1.85e-08 2.09e-08 4.22e-08 2.28e-07 9.95e-08 2.69e-07 erg/cm2
Peak flux Power-law 9.79e-02 1.04e-01 7.78e-02 9.47e-02 3.15e-01 3.74e-01 ph/cm2/s
Error 6.55e-02 4.30e-02 5.98e-02 1.18e-01 1.23e-01 1.61e-01 ph/cm2/s
Fluence Cutoff-PL 7.40e-08 1.42e-07 1.67e-07 1.61e-07 4.65e-07 5.43e-07 erg/cm2
Error 2.01e-08 2.87e-08 4.99e-08 3.29e-07 1.17e-07 3.53e-07 erg/cm2
Peak flux Cutoff-PL 9.78e-02 1.04e-01 7.78e-02 9.41e-02 3.15e-01 3.68e-01 ph/cm2/s
Error 6.55e-02 4.31e-02 5.98e-02 1.17e-01 1.23e-01 1.61e-01 ph/cm2/s
Fluence Band 7.30e-08 1.46e-07 1.57e-07 3.11e-07 4.75e-07 6.85e-07 erg/cm2
Error 2.21e-08 2.83e-08 4.61e-08 2.36e-07 9.46e-08 1.45e-07 erg/cm2
Peak flux Band 9.78e-02 1.04e-01 7.78e-02 9.40e-02 3.15e-01 3.73e-01 ph/cm2/s
Error 8.44e-02 4.31e-02 4.50e-02 1.17e-01 1.23e-01 1.72e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.627 0.290 - - 7.01e-04 1.28e-04 56.258 57
CPL 0.963 1.118 66.0 5000.0 1.68e-03 5.09e-03 55.464 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.414 0.804 - - 2.58e-03 1.09e-03 65.154 57
CPL 1.314 2.494 356.2 0.0 2.89e-03 2.44e-02 65.166 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 76.704 4.536 81.240
T90 70.464 8.392 78.856
T50 32.032 23.368 55.400
Peak 1.000 80.260 81.260
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
299.8380 +70.1303 0.0255 16.3 -170.2 0.7346 7.5 TRIG_00296856
------------------------------------------
Foreground time interval of the image:
4.536 70.201 (delta_t = 65.665 [sec])
Background time interval of the image:
-239.000 4.536 (delta_t = 243.536 [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 4.536 sec. to 81.240 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62699 ( -0.284480 0.294588 )
Norm@50keV : 7.006702E-04 ( -1.292698E-04 1.259570E-04) )
------------------------------------------------------------
Chi-Squared = 56.25754 using 59 PHA bins.
Reduced chi-squared = 0.9869744 for 57 degrees of freedom
Null hypothesis probability = 0.503
Photon flux (15-150 keV) in 76.70 sec: 9.080374E-02 ( -0.0144416 0.0144423 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.01101e-07 ( -9.77012e-08 1.01298e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.536 sec. to 81.240 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.962514 ( -1.32709 0.909340 )
Epeak [keV] : 66.0156 ( -66.0056 9933.98 )
Norm@50keV : 1.681791E-03 ( -1.681791E-03 8.502753E-03) )
------------------------------------------------------------
Chi-Squared = 55.46360 using 59 PHA bins.
Reduced chi-squared = 0.9904214 for 56 degrees of freedom
Null hypothesis probability = 0.495
Photon flux (15-150 keV) in 76.70 sec: 8.876549E-02 ( -0.014912 0.0147975 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.65493e-07 ( -1.13731e-07 1.20279e-07 ) ergs/cm2
Band function
Time interval is from 4.536 sec. to 81.240 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.10817 ( -8.89183 1.72863 )
beta : -8.82655 ( -8.15482 0.426224 )
Epeak [keV] : 73.3207 ( -32.9900 849.479 )
Norm@50keV : 1.394539E-03 ( -20.5911 8.71407 )
------------------------------------------------------------
Chi-Squared = 55.45105 using 59 PHA bins.
Reduced chi-squared = 1.008201 for 55 degrees of freedom
Null hypothesis probability = 0.458
Photon flux (15-150 keV) in 76.70 sec: 9.021486E-02 ( -0.0155295 0.0170631 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.75167e-07 ( -1.01002e-07 8.82909e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 80.264 sec. to 81.256 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41410 ( -0.788014 0.819589 )
Norm@50keV : 2.582026E-03 ( -1.129197E-03 1.054708E-03) )
------------------------------------------------------------
Chi-Squared = 65.15405 using 59 PHA bins.
Reduced chi-squared = 1.143054 for 57 degrees of freedom
Null hypothesis probability = 0.214
Photon flux (15-150 keV) in 0.9920 sec: 0.315463 ( -0.123188 0.123283 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.46833e-08 ( -1.1413e-08 1.23145e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 80.264 sec. to 81.256 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31414 ( -2.84100 2.14630 )
Epeak [keV] : 356.214 ( )
Norm@50keV : 2.894465E-03 ( -1.149385E-03 4.769776E-02) )
------------------------------------------------------------
Chi-Squared = 65.16599 using 59 PHA bins.
but latest trial 3.39746 gives Chi-Squared = 1.44647
Reduced chi-squared = 1.163678 for 56 degrees of freedom
Null hypothesis probability = 0.188
Photon flux (15-150 keV) in 0.9920 sec: 0.315361 ( -0.123149 0.123246 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.47616e-08 ( -1.14944e-08 1.22467e-08 ) ergs/cm2
Band function
Time interval is from 80.264 sec. to 81.256 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.31664 ( -6.04236 5.47515 )
beta : -8.31739 ( -0.818715 0.787390 )
Epeak [keV] : 358.360 ( -358.260 9641.64 )
Norm@50keV : 2.889491E-03 ( -0.153490 0.143353 )
------------------------------------------------------------
Chi-Squared = 65.16576 using 59 PHA bins.
Reduced chi-squared = 1.184832 for 55 degrees of freedom
Null hypothesis probability = 0.164
Photon flux (15-150 keV) in 0.9920 sec: 0.315380 ( -0.123149 0.123041 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.45675e-08 ( -1.21907e-08 5.85915e-09 ) ergs/cm2
Plot creation:
Sat Dec 15 01:12:36 EST 2007