batgrbproduct Analysis for Trigger=292004
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 15:09:14 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger292004/GCN5_download_cron
======================================================================
Trigger: 00292004 Segment: 000
BAT Trigger Time: 212267725.932 [s; MET]
Trigger Stop: 212267725.964 [s; MET]
UTC: 2007-09-23T19:15:23.687760 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 184.626373075231 Dec: -38.2677479658261 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.29
Image Trigger?: NO
Rate S/N Ratio: 45.9673797382448 [ if not an image trigger ]
Image S/N Ratio: 9.29
Flight Position: [ source = BAT ]
RA: 184.626373075231 Dec: -38.2677479658261 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 184.622760038075 Dec: -38.2939136448864 [deg; J2000]
{ 12h 18m 29.5s , -38d 17' 38.1" }
+/- 2.06703394812414 [arcmin] (estimated 90% radius based on SNR)
+/- 0.889287694931086 [arcmin] (formal 1-sigma fit error)
SNR: 10.7800753180888
RA = 12h 18m 29.5s (184.622760 deg.)
Dec = -38d 17' 38" (-38.293914 deg.)
Angular difference between Flight and Ground position is 1.579136 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 0.175999999046326 +/- 0.0505964225831327
Measured from: -0.0120000243186951
to: 0.163999974727631 [s; relative to TRIGTIME]
T50: 0.0319999754428864 +/- 0.0640000104904175
Measured from: 0.0039999783039093
to: 0.0359999537467957 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.400000005960464
to: 0.599999994039536 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0120000243186951
to: 0.195999979972839 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.014353 0.023059 0.025759 0.012454
0.003236 0.003515 0.003556 0.003064 [error]
Peak 0.013924 0.023236 0.026004 0.012576
0.003322 0.003575 0.003630 0.003159 [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 3.84e-09 9.44e-09 1.86e-08 9.05e-08 5.02e-08 1.07e-07 erg/cm2
Error 1.21e-09 1.73e-09 3.30e-09 3.92e-08 8.61e-09 0.00e+00 erg/cm2
Peak flux Power-law 5.38e-01 7.33e-01 7.30e-01 1.33e+00 2.43e+00 3.32e+00 ph/cm2/s
Error 1.76e-01 1.40e-01 1.24e-01 5.02e-01 3.67e-01 5.78e-01 ph/cm2/s
Fluence Cutoff-PL 3.76e-09 9.43e-09 1.86e-08 9.02e-08 5.02e-08 1.10e-07 erg/cm2
Error 1.21e-09 1.73e-09 3.30e-09 3.90e-08 8.62e-09 0.00e+00 erg/cm2
Peak flux Cutoff-PL 5.38e-01 7.31e-01 7.31e-01 1.31e+00 2.43e+00 3.31e+00 ph/cm2/s
Error 1.77e-01 1.41e-01 1.25e-01 5.20e-01 3.77e-01 5.80e-01 ph/cm2/s
Fluence Band 3.78e-09 9.39e-09 1.86e-08 9.01e-08 5.02e-08 6.49e-08 erg/cm2
Error 1.20e-09 1.72e-09 3.30e-09 3.75e-08 8.61e-09 0.00e+00 erg/cm2
Peak flux Band 5.44e-01 7.35e-01 7.35e-01 1.35e+00 2.42e+00 3.30e+00 ph/cm2/s
Error 1.88e-01 1.36e-01 1.21e-01 8.15e-01 3.75e-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 1.021 0.290 - - 2.25e-02 3.40e-03 56.616 57
CPL 1.016 0.292 9999.0 5000.0 2.26e-02 3.41e-03 56.629 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.001 0.292 - - 2.11e-02 3.22e-03 59.579 57
CPL 0.995 0.294 9991.8 5000.0 2.12e-02 3.23e-03 59.589 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.208 -0.012 0.196
T90 0.176 -0.012 0.164
T50 0.032 0.004 0.036
Peak 1.000 -0.400 0.600
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
184.6228 -38.2939 0.0178 20.1 -92.4 0.0759 10.8 TRIG_00292004
------------------------------------------
Foreground time interval of the image:
0.160 0.368 (delta_t = 0.208 [sec])
Background time interval of the image:
-239.760 -227.480 (delta_t = 12.280 [sec])
-226.760 -57.680 (delta_t = 169.080 [sec])
-56.760 0.160 (delta_t = 56.920 [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 0.160 sec. to 0.368 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02108 ( -0.295346 0.284098 )
Norm@50keV : 2.248988E-02 ( -3.399739E-03 3.390901E-03) )
------------------------------------------------------------
Chi-Squared = 56.61627 using 59 PHA bins.
Reduced chi-squared = 0.9932678 for 57 degrees of freedom
Null hypothesis probability = 0.489
Photon flux (15-150 keV) in 0.2080 sec: 2.59268 ( -0.39807 0.39902 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.017e-08 ( -8.52488e-09 8.69814e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.160 sec. to 0.368 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01575 ( -0.297783 0.286035 )
Epeak [keV] : 9998.98 ( -9998.97 1.02148 )
Norm@50keV : 2.262253E-02 ( -3.415002E-03 3.407689E-03) )
------------------------------------------------------------
Chi-Squared = 56.62946 using 59 PHA bins.
Reduced chi-squared = 1.011240 for 56 degrees of freedom
Null hypothesis probability = 0.451
Photon flux (15-150 keV) in 0.2080 sec: 2.59160 ( -0.39782 0.39907 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.02345e-08 ( -8.58291e-09 8.66632e-09 ) ergs/cm2
Band function
Time interval is from 0.160 sec. to 0.368 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.850240 ( -10.5898 4.41024 )
beta : -1.02108 ( -0.318878 0.300054 )
Epeak [keV] : 56.2905 ( -33.9071 810.483 )
Norm@50keV : 3.621173E-02 ( -0.454917 2262.95 )
------------------------------------------------------------
Chi-Squared = 56.61627 using 59 PHA bins.
Reduced chi-squared = 1.029387 for 55 degrees of freedom
Null hypothesis probability = 0.414
Photon flux (15-150 keV) in 0.2080 sec: 2.59159 ( -0.39781 0.39908 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.01752e-08 ( -8.55275e-09 8.67131e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.160 sec. to 0.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00057 ( -0.298168 0.286107 )
Norm@50keV : 2.107906E-02 ( -3.225809E-03 3.213558E-03) )
------------------------------------------------------------
Chi-Squared = 59.57885 using 59 PHA bins.
Reduced chi-squared = 1.045243 for 57 degrees of freedom
Null hypothesis probability = 0.382
Photon flux (15-150 keV) in 0.2240 sec: 2.42807 ( -0.36871 0.36527 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.09425e-08 ( -8.64528e-09 8.93782e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.160 sec. to 0.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.994976 ( -0.300607 0.288127 )
Epeak [keV] : 9991.80 ( -9991.79 8.20020 )
Norm@50keV : 2.120610E-02 ( -3.239654E-03 3.229173E-03) )
------------------------------------------------------------
Chi-Squared = 59.58905 using 59 PHA bins.
Reduced chi-squared = 1.064090 for 56 degrees of freedom
Null hypothesis probability = 0.346
Photon flux (15-150 keV) in 0.2240 sec: 2.42617 ( -0.37605 0.37749 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.10469e-08 ( -8.73645e-09 8.87085e-09 ) ergs/cm2
Band function
Time interval is from 0.160 sec. to 0.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.845160 ( -10.1148 2.63908 )
beta : -1.00057 ( -8.98938 0.305053 )
Epeak [keV] : 53.9319 ( -41.5426 265.309 )
Norm@50keV : 3.323448E-02 ( -0.144989 1539.39 )
------------------------------------------------------------
Chi-Squared = 59.57885 using 59 PHA bins.
Reduced chi-squared = 1.083252 for 55 degrees of freedom
Null hypothesis probability = 0.313
Photon flux (15-150 keV) in 0.2240 sec: 2.41931 ( -0.38063 0.36902 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.10093e-08 ( -8.7313e-09 8.86189e-09 ) ergs/cm2
Plot creation:
Fri Dec 14 15:39:52 EST 2007