batgrbproduct Analysis for Trigger=291728
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 14:28:39 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger291728/GCN5_download_cron
======================================================================
Trigger: 00291728 Segment: 000
BAT Trigger Time: 212015074.624 [s; MET]
Trigger Stop: 212015075.648 [s; MET]
UTC: 2007-09-20T21:04:32.386340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 0.144108470626363 Dec: -34.8186092179982 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.94
Image Trigger?: NO
Rate S/N Ratio: 14.1067359796659 [ if not an image trigger ]
Image S/N Ratio: 7.94
Flight Position: [ source = BAT ]
RA: 0.144108470626363 Dec: -34.8186092179982 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 0.127183563216136 Dec: -34.8442480017183 [deg; J2000]
{ 00h 00m 30.5s , -34d 50' 39.3" }
+/- 0.967383222695612 [arcmin] (estimated 90% radius based on SNR)
+/- 0.417513287405714 [arcmin] (formal 1-sigma fit error)
SNR: 31.8927433748726
RA = 0h 0m 30.5s (0.127184 deg.)
Dec = -34d 50' 39" (-34.844248 deg.)
Angular difference between Flight and Ground position is 1.749647 arcmin
Partial Coding Fraction: 1.03125 [ including projection effects ]
Duration
T90: 20.2120000123978 +/- 2.26585788587217
Measured from: -9.15200001001358
to: 11.0600000023842 [s; relative to TRIGTIME]
T50: 8.72000002861023 +/- 1.11370374629074
Measured from: -3.66000002622604
to: 5.06000000238419 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.488000005483627
to: 0.511999994516373 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.1759999990463
to: 13.3519999980927 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.499608 0.623732 0.243334 0.039877
0.022758 0.023168 0.020122 0.017309 [error]
Peak 0.030393 0.045164 0.023695 0.004619
0.004799 0.004933 0.004327 0.003648 [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 1.66e-07 2.25e-07 2.25e-07 4.06e-07 7.49e-07 1.01e-06 erg/cm2
Error 1.33e-08 1.16e-08 1.90e-08 6.94e-08 4.36e-08 8.89e-08 erg/cm2
Peak flux Power-law 3.04e-01 2.75e-01 1.71e-01 1.62e-01 8.19e-01 9.13e-01 ph/cm2/s
Error 6.22e-02 3.79e-02 3.41e-02 6.24e-02 1.12e-01 1.29e-01 ph/cm2/s
Fluence Cutoff-PL 1.45e-07 2.56e-07 2.06e-07 6.38e-08 6.56e-07 6.71e-07 erg/cm2
Error 1.57e-08 1.66e-08 2.57e-08 4.49e-08 5.20e-08 6.83e-08 erg/cm2
Peak flux Cutoff-PL 2.78e-01 3.21e-01 1.62e-01 3.23e-02 7.88e-01 7.93e-01 ph/cm2/s
Error 6.99e-02 6.13e-02 4.99e-02 7.62e-02 1.17e-01 1.32e-01 ph/cm2/s
Fluence Band 1.38e-07 2.61e-07 1.96e-07 2.01e-07 6.79e-07 7.90e-07 erg/cm2
Error 1.59e-08 1.65e-08 2.29e-08 7.44e-08 4.68e-08 1.16e-07 erg/cm2
Peak flux Band 2.80e-01 3.46e-01 1.51e-01 8.67e-02 7.97e-01 8.59e-01 ph/cm2/s
Error 4.54e-02 3.32e-02 4.63e-02 8.56e-02 1.47e-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 2.002 0.099 - - 3.31e-03 2.02e-04 67.158 57
CPL 0.670 0.582 41.3 4.5 1.90e-02 1.71e-02 45.206 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.684 0.235 - - 6.20e-03 9.57e-04 63.910 57
CPL 0.409 1.558 50.4 110.3 3.53e-02 2.55e-01 60.841 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: 13.504000 sec.
T50 in the 50-300 keV band: 7.424000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 24.528 -11.176 13.352
T90 20.212 -9.152 11.060
T50 8.720 -3.660 5.060
Peak 1.000 -0.488 0.512
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
0.1272 -34.8442 0.0060 7.8 155.7 1.4803 31.9 TRIG_00291728
------------------------------------------
Foreground time interval of the image:
-11.176 13.352 (delta_t = 24.528 [sec])
Background time interval of the image:
-106.023 -11.176 (delta_t = 94.847 [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 -11.176 sec. to 13.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00244 ( -9.762037E-02 9.944010E-02) )
Norm@50keV : 3.308909E-03 ( -2.025575E-04 2.008728E-04) )
------------------------------------------------------------
Chi-Squared = 67.15800 using 59 PHA bins.
Reduced chi-squared = 1.178210 for 57 degrees of freedom
Null hypothesis probability = 0.168
Photon flux (15-150 keV) in 24.53 sec: 0.496891 ( -0.026335 0.026379 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.48545e-07 ( -4.33789e-08 4.38891e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.176 sec. to 13.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.669593 ( -0.626404 0.538473 )
Epeak [keV] : 41.3458 ( -4.12524 4.83153 )
Norm@50keV : 1.903081E-02 ( -9.605772E-03 2.468893E-02) )
------------------------------------------------------------
Chi-Squared = 45.20564 using 59 PHA bins.
Reduced chi-squared = 0.8072435 for 56 degrees of freedom
Null hypothesis probability = 0.848
Photon flux (15-150 keV) in 24.53 sec: 0.465033 ( -0.028765 0.028822 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.56445e-07 ( -5.08703e-08 5.30339e-08 ) ergs/cm2
Band function
Time interval is from -11.176 sec. to 13.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.351635 ( -0.999857 1.54794 )
beta : -2.69962 ( -0.569372 0.274210 )
Epeak [keV] : 38.4188 ( -4.62526 6.43672 )
Norm@50keV : 3.152884E-02 ( -6.695854E-02 1.97768 )
------------------------------------------------------------
Chi-Squared = 42.05760 using 59 PHA bins.
Reduced chi-squared = 0.7646836 for 55 degrees of freedom
Null hypothesis probability = 0.900
Photon flux (15-150 keV) in 24.53 sec: 0.463406 ( -0.02876 0.026291 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.79246e-07 ( -4.93838e-08 4.42423e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.488 sec. to 0.512 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68415 ( -0.230561 0.238485 )
Norm@50keV : 6.197894E-03 ( -9.674295E-04 9.474820E-04) )
------------------------------------------------------------
Chi-Squared = 63.91009 using 59 PHA bins.
Reduced chi-squared = 1.121230 for 57 degrees of freedom
Null hypothesis probability = 0.247
Photon flux (15-150 keV) in 1.000 sec: 0.818645 ( -0.11227 0.112297 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.747e-08 ( -9.3462e-09 9.5438e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.488 sec. to 0.512 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.409252 ( -1.87889 1.23632 )
Epeak [keV] : 50.3888 ( -11.8615 208.767 )
Norm@50keV : 3.531102E-02 ( -3.531102E-02 0.475512 )
------------------------------------------------------------
Chi-Squared = 60.84145 using 59 PHA bins.
Reduced chi-squared = 1.086454 for 56 degrees of freedom
Null hypothesis probability = 0.306
Photon flux (15-150 keV) in 1.000 sec: 0.787837 ( -0.117076 0.117098 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.95108e-08 ( -1.08249e-08 1.2257e-08 ) ergs/cm2
Band function
Time interval is from -0.488 sec. to 0.512 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.195800 ( -3.60222 2.68420 )
beta : -2.17935 ( -0.719611 0.434515 )
Epeak [keV] : 40.5453 ( -8.46506 14.4105 )
Norm@50keV : 9.862960E-02 ( -16.9521 101.234 )
------------------------------------------------------------
Chi-Squared = 58.41648 using 59 PHA bins.
Reduced chi-squared = 1.062118 for 55 degrees of freedom
Null hypothesis probability = 0.351
Photon flux (15-150 keV) in 1.000 sec: 0.796717 ( -0.05695 0.114156 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.27377e-08 ( -9.1211e-09 9.4971e-09 ) ergs/cm2
Plot creation:
Fri Dec 14 15:06:54 EST 2007