batgrbproduct Analysis for Trigger=288596
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 10:59:13 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger288596/GCN5_download_cron
======================================================================
Trigger: 00288596 Segment: 000
BAT Trigger Time: 210629472 [s; MET]
Trigger Stop: 210629536 [s; MET]
UTC: 2007-09-04T20:11:09.798220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 83.6048763182781 Dec: 22.0063055620679 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 15
Flight Position: [ source = BAT ]
RA: 83.6048763182781 Dec: 22.0063055620679 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 83.6198197085179 Dec: 22.004774241788 [deg; J2000]
{ 05h 34m 28.8s , +22d 00' 17.2" }
+/- 2.06172625700343 [arcmin] (estimated 90% radius based on SNR)
+/- 0.983375939242336 [arcmin] (formal 1-sigma fit error)
SNR: 10.8197430886051
RA = 5h 34m 28.8s (83.619820 deg.)
Dec = 22d 0' 17" (22.004774 deg.)
Angular difference between Flight and Ground position is 0.836346 arcmin
Partial Coding Fraction: 0.375 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.432665 0.390304 0.222791 0.027258
0.050656 0.050946 0.045637 0.041632 [error]
Peak 0.432665 0.390304 0.222791 0.027258
0.050656 0.050946 0.045637 0.041632 [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 1.67e-07 2.06e-07 1.83e-07 2.83e-07 6.54e-07 8.41e-07 erg/cm2
Error 3.36e-08 2.77e-08 4.76e-08 1.49e-07 1.05e-07 1.99e-07 erg/cm2
Peak flux Power-law 1.66e-01 1.13e-01 5.03e-02 3.11e-02 3.44e-01 3.60e-01 ph/cm2/s
Error 3.41e-02 1.50e-02 1.26e-02 1.52e-02 4.64e-02 4.78e-02 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 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Fluence Band 1.63e-07 2.29e-07 8.57e-07 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 2.34e-07 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.58e-01 1.13e-01 5.14e-02 3.27e-02 3.43e-01 3.55e-01 ph/cm2/s
Error 3.36e-02 1.51e-02 7.44e-03 9.81e-03 4.56e-02 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.165 0.295 - - 2.12e-03 3.88e-04 57.715 57
CPL 1.995 0.000 2.9 0.0 2.40e-03 0.00e+00 58.483 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.165 0.295 - - 2.12e-03 3.88e-04 57.715 57
CPL 1.995 0.000 2.9 0.0 2.40e-03 0.00e+00 58.483 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
83.6198 +22.0048 0.0180 46.7 -15.1 1.1126 10.8 TRIG_00288596
------------------------------------------
Foreground time interval of the image:
0.000 33.064 (delta_t = 33.064 [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 0.000 sec. to 33.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.16513 ( -0.281082 0.308067 )
Norm@50keV : 2.115136E-03 ( -3.986708E-04 3.768785E-04) )
------------------------------------------------------------
Chi-Squared = 57.71464 using 59 PHA bins.
Reduced chi-squared = 1.012537 for 57 degrees of freedom
Null hypothesis probability = 0.449
Photon flux (15-150 keV) in 33.06 sec: 0.343869 ( -0.046373 0.04645 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.54406e-07 ( -1.03511e-07 1.0567e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99547 ( )
Epeak [keV] : 2.85053 ( )
Norm@50keV : 2.404120E-03 ( )
------------------------------------------------------------
Chi-Squared = 58.48313 using 59 PHA bins.
Reduced chi-squared = 1.044342 for 56 degrees of freedom
Null hypothesis probability = 0.384
Photon flux (15-150 keV) in 33.06 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.58476 ( -7.77524 7.22476 )
beta : -2.09269 ( -0.308691 0.280899 )
Epeak [keV] : 7.42149 ( -7.32149 9992.58 )
Norm@50keV : 8.627645E-03 ( -5.421084E-02 5.121177E-02) )
------------------------------------------------------------
Chi-Squared = 57.88630 using 59 PHA bins.
Reduced chi-squared = 1.052478 for 55 degrees of freedom
Null hypothesis probability = 0.369
Photon flux (15-150 keV) in 33.06 sec: 0.343021 ( -0.045696 0.045573 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.16513 ( -0.281082 0.308067 )
Norm@50keV : 2.115136E-03 ( -3.986708E-04 3.768785E-04) )
------------------------------------------------------------
Chi-Squared = 57.71464 using 59 PHA bins.
Reduced chi-squared = 1.012537 for 57 degrees of freedom
Null hypothesis probability = 0.449
Photon flux (15-150 keV) in 33.06 sec: 0.343869 ( -0.046373 0.04645 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.54406e-07 ( -1.03511e-07 1.0567e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99547 ( )
Epeak [keV] : 2.85053 ( )
Norm@50keV : 2.404120E-03 ( )
------------------------------------------------------------
Chi-Squared = 58.48313 using 59 PHA bins.
Reduced chi-squared = 1.044342 for 56 degrees of freedom
Null hypothesis probability = 0.384
Photon flux (15-150 keV) in 33.06 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.58476 ( -7.77524 7.22476 )
beta : -2.09269 ( -0.308691 0.280899 )
Epeak [keV] : 7.42149 ( -7.32149 9992.58 )
Norm@50keV : 8.627645E-03 ( -5.421084E-02 5.121177E-02) )
------------------------------------------------------------
Chi-Squared = 57.88630 using 59 PHA bins.
Reduced chi-squared = 1.052478 for 55 degrees of freedom
Null hypothesis probability = 0.369
Photon flux (15-150 keV) in 33.06 sec: 0.343021 ( -0.045696 0.045573 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Fri Dec 14 11:04:56 EST 2007