batgrbproduct Analysis for Trigger=296683
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): Fri Dec 14 23:40:49 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger296683/GCN5_download_cron
======================================================================
Trigger: 00296683 Segment: 000
BAT Trigger Time: 216830040 [s; MET]
Trigger Stop: 216830360 [s; MET]
UTC: 2007-11-15T14:33:57.636240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 152.409224748767 Dec: -58.2932498795245 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.72
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.72
Flight Position: [ source = BAT ]
RA: 152.409224748767 Dec: -58.2932498795245 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 152.515446161154 Dec: -58.3142171115839 [deg; J2000]
{ 10h 10m 03.7s , -58d 18' 51.2" }
+/- 3.45252076767711 [arcmin] (estimated 90% radius based on SNR)
+/- 1.86208205767979 [arcmin] (formal 1-sigma fit error)
SNR: 5.18026810968615
RA = 10h 10m 3.7s (152.515446 deg.)
Dec = -58d 18' 51" (-58.314217 deg.)
Angular difference between Flight and Ground position is 3.577143 arcmin
Partial Coding Fraction: 0.7265625 [ including projection effects ]
Duration
T90: 518.683999985456 +/- 109.557950046135
Measured from: -29.1839999854565
to: 489.5 [s; relative to TRIGTIME]
T50: 296.227999985218 +/- 135.275091639936
Measured from: 79.1240000128746
to: 375.351999998093 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -32.9359999895096
to: -31.9359999895096 [s; relative to TRIGTIME]
Total Fluence
Measured from: -42.2159999907017
to: 526.33599999547 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.083866 1.006064 -0.003911 0.058574
0.143507 0.142424 0.127068 0.115188 [error]
Peak 0.007769 0.019787 0.006424 0.011790
0.008524 0.008605 0.007648 0.006860 [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 3.89e-07 3.39e-07 2.02e-07 1.81e-07 1.01e-06 1.11e-06 erg/cm2
Error 7.91e-08 7.70e-08 9.36e-08 1.56e-07 2.31e-07 3.16e-07 erg/cm2
Peak flux Power-law 9.65e-02 9.35e-02 6.32e-02 6.69e-02 2.80e-01 3.20e-01 ph/cm2/s
Error 1.09e-01 8.23e-02 6.16e-02 1.63e-01 2.09e-01 2.41e-01 ph/cm2/s
Fluence Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 7.56e-02 1.37e-01 4.03e-02 7.48e-04 2.54e-01 2.54e-01 ph/cm2/s
Error 1.02e-01 1.03e-01 6.59e-02 1.36e-01 1.98e-01 2.32e-01 ph/cm2/s
Fluence Band 3.75e-07 3.97e-07 1.18e-07 1.46e-08 8.83e-07 9.43e-07 erg/cm2
Error 8.20e-08 9.29e-08 6.04e-08 4.48e-08 1.88e-07 2.68e-07 erg/cm2
Peak flux Band 8.71e-02 1.34e-01 5.36e-02 2.00e-02 2.69e-01 3.00e-01 ph/cm2/s
Error 1.17e-01 6.34e-02 1.22e-01 1.96e-01 2.52e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.746 0.426 - - 1.64e-04 5.67e-05 64.780 57
CPL -0.758 0.000 24.9 0.0 3.71e-02 0.00e+00 59.934 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.566 1.665 - - 2.20e-03 1.94e-03 59.942 57
CPL 0.200 0.000 53.3 0.0 1.44e-02 0.00e+00 59.632 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 568.552 -42.216 526.336
T90 518.684 -29.184 489.500
T50 296.228 79.124 375.352
Peak 1.000 -32.936 -31.936
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
152.5154 -58.3142 0.0370 29.9 -143.0 1.5088 5.2 TRIG_00296683
------------------------------------------
Foreground time interval of the image:
-6.699 375.630 (delta_t = 382.329 [sec])
377.000 420.701 (delta_t = 43.701 [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
Multiple GTIs in the spectrum
tstart tstop
-42.216000 375.630000
377.000000 526.336000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.74635 ( -0.389480 0.462365 )
Norm@50keV : 1.644017E-04 ( -5.569593E-05 5.769981E-05) )
------------------------------------------------------------
Chi-Squared = 64.77962 using 59 PHA bins.
Reduced chi-squared = 1.136485 for 57 degrees of freedom
Null hypothesis probability = 0.224
Photon flux (15-150 keV) in 567.2 sec: 3.783827E-02 ( -0.00668215 0.00668902 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00822e-06 ( -2.22246e-07 2.39483e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-42.216000 375.630000
377.000000 526.336000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.757674 ( )
Epeak [keV] : 24.8723 ( )
Norm@50keV : 3.713649E-02 ( )
------------------------------------------------------------
Chi-Squared = 59.93357 using 59 PHA bins.
Reduced chi-squared = 1.070242 for 56 degrees of freedom
Null hypothesis probability = 0.335
Photon flux (15-150 keV) in 567.2 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-42.216000 375.630000
377.000000 526.336000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36075 ( -1.98875 0.851403 )
beta : -8.78193 ( -5.39941 1.87166 )
Epeak [keV] : 15.5724 ( -3.86737 6.07815 )
Norm@50keV : 1.336002E-03 ( -4.822971E-02 5.36528 )
------------------------------------------------------------
Chi-Squared = 61.57928 using 59 PHA bins.
Reduced chi-squared = 1.119623 for 55 degrees of freedom
Null hypothesis probability = 0.252
Photon flux (15-150 keV) in 567.2 sec: 3.579841E-02 ( -0.0062356 0.00634076 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.83028e-07 ( -1.83376e-07 1.92649e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -32.936 sec. to -31.936 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56615 ( -1.71670 1.61346 )
Norm@50keV : 2.200764E-03 ( -2.200764E-03 1.688633E-03) )
------------------------------------------------------------
Chi-Squared = 59.94237 using 59 PHA bins.
Reduced chi-squared = 1.051621 for 57 degrees of freedom
Null hypothesis probability = 0.369
Photon flux (15-150 keV) in 1.000 sec: 0.280089 ( -0.208169 0.210001 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.06836e-08 ( -1.60389e-08 1.78273e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -32.936 sec. to -31.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.200321 ( )
Epeak [keV] : 53.3455 ( )
Norm@50keV : 1.436792E-02 ( )
------------------------------------------------------------
Chi-Squared = 59.63243 using 59 PHA bins.
Reduced chi-squared = 1.064865 for 56 degrees of freedom
Null hypothesis probability = 0.345
Photon flux (15-150 keV) in 1.000 sec: 0.253782 ( -0.178819 0.217088 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.439e-08 ( -1.03469e-08 2.22539e-08 ) ergs/cm2
Band function
Time interval is from -32.936 sec. to -31.936 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.911722 ( -13.6317 1.36828 )
beta : -2.45172 ( -7.18663 12.8134 )
Epeak [keV] : 43.3914 ( -39.9965 115.594 )
Norm@50keV : 7.643317E-02 ( -12.0366 13.1867 )
------------------------------------------------------------
Chi-Squared = 59.37462 using 59 PHA bins.
Reduced chi-squared = 1.079538 for 55 degrees of freedom
Null hypothesis probability = 0.319
Photon flux (15-150 keV) in 1.000 sec: 0.269338 ( -0.18814 0.204362 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79768e-08 ( -1.37619e-08 1.83713e-08 ) ergs/cm2
Plot creation:
Sat Dec 15 00:13:42 EST 2007