batgrbproduct Analysis for Trigger=288713
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 11:11:15 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger288713/GCN5_download_cron
======================================================================
Trigger: 00288713 Segment: 000
BAT Trigger Time: 210822056 [s; MET]
Trigger Stop: 210822120 [s; MET]
UTC: 2007-09-07T01:40:53.793260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 247.95425388895 Dec: -48.8407004977844 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7
Flight Position: [ source = BAT ]
RA: 247.95425388895 Dec: -48.8407004977844 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 247.985597544376 Dec: -48.8480417629369 [deg; J2000]
{ 16h 31m 56.5s , -48d 50' 53.0" }
+/- 11.648600355355 [arcmin] (estimated 90% radius based on SNR)
+/- 20.3535144793616 [arcmin] (formal 1-sigma fit error)
SNR: 0.911738243599218
RA = 16h 31m 56.5s (247.985598 deg.)
Dec = -48d 50' 53" (-48.848042 deg.)
Angular difference between Flight and Ground position is 1.313694 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 248.083999991417 +/- 74.6465007092344
Measured from: -62.3039999902248
to: 185.780000001192 [s; relative to TRIGTIME]
T50: 95.6719999909401 +/- 36.1693599176202
Measured from: 0.752000004053116
to: 96.4239999949932 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.65999999642372
to: 9.65999999642372 [s; relative to TRIGTIME]
Total Fluence
Measured from: -97.2520000040531
to: 215.539999991655 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.677838 0.771706 0.437462 0.268649
0.045664 0.043517 0.038363 0.035157 [error]
Peak 0.005837 0.005872 0.004672 0.004613
0.002559 0.002564 0.002202 0.001998 [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 1.99e-07 3.06e-07 3.52e-07 7.78e-07 1.09e-06 1.64e-06 erg/cm2
Error 2.34e-08 2.11e-08 3.85e-08 1.83e-07 8.67e-08 2.14e-07 erg/cm2
Peak flux Power-law 5.98e-02 4.59e-02 2.36e-02 1.74e-02 1.37e-01 1.47e-01 ph/cm2/s
Error 3.58e-02 1.98e-02 1.75e-02 2.81e-02 5.75e-02 6.34e-02 ph/cm2/s
Fluence Cutoff-PL 1.99e-07 3.06e-07 3.52e-07 7.72e-07 1.09e-06 1.57e-06 erg/cm2
Error 2.34e-08 2.11e-08 3.86e-08 1.82e-07 8.67e-08 3.24e-07 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 1.98e-07 1.62e-06 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 1.11e-07 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 5.98e-02 4.59e-02 2.36e-02 1.73e-02 1.37e-01 1.46e-01 ph/cm2/s
Error 3.58e-02 2.24e-02 1.76e-02 2.79e-02 5.75e-02 4.84e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.795 0.140 - - 3.79e-04 2.92e-05 42.620 57
CPL 1.566 0.000 88.7 0.0 4.99e-04 2.08e-04 43.786 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.961 0.991 - - 9.31e-04 7.15e-04 43.869 57
CPL 1.664 0.000 57.8 0.0 1.32e-03 0.00e+00 43.936 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 312.792 -97.252 215.540
T90 248.084 -62.304 185.780
T50 95.672 0.752 96.424
Peak 1.000 8.660 9.660
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
247.9856 -48.8480 0.2125 10.7 34.5 0.5600 0.9 TRIG_00288713
------------------------------------------
Foreground time interval of the image:
-66.699 -39.010 (delta_t = 27.689 [sec])
-38.000 215.540 (delta_t = 253.540 [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
-97.252000 -39.010000
-38.000000 215.540000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79525 ( -0.138686 0.141297 )
Norm@50keV : 3.786396E-04 ( -2.944685E-05 2.902286E-05) )
------------------------------------------------------------
Chi-Squared = 42.62034 using 59 PHA bins.
Reduced chi-squared = 0.7477252 for 57 degrees of freedom
Null hypothesis probability = 0.922
Photon flux (15-150 keV) in 311.8 sec: 5.207989E-02 ( -0.00366452 0.00367548 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08706e-06 ( -8.61223e-08 8.72105e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-97.252000 -39.010000
-38.000000 215.540000
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56595 ( )
Epeak [keV] : 88.7240 ( )
Norm@50keV : 4.994993E-04 ( -3.470550E-05 3.821329E-04) )
------------------------------------------------------------
Chi-Squared = 43.78585 using 59 PHA bins.
but latest trial 1.27156 gives Chi-Squared = 3.67554
Reduced chi-squared = 0.7818901 for 56 degrees of freedom
Null hypothesis probability = 0.882
Photon flux (15-150 keV) in 311.8 sec: 5.205727E-02 ( -0.00366289 0.00367394 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08703e-06 ( -8.61566e-08 8.7198e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-97.252000 -39.010000
-38.000000 215.540000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.32026 ( -8.67974 2.92284 )
beta : -1.80508 ( -0.185543 0.147903 )
Epeak [keV] : 32.6140 ( -32.5140 6451.90 )
Norm@50keV : 8.910072E-04 ( -8.910072E-04 4.85020 )
------------------------------------------------------------
Chi-Squared = 42.60674 using 59 PHA bins.
Reduced chi-squared = 0.7746679 for 55 degrees of freedom
Null hypothesis probability = 0.889
Photon flux (15-150 keV) in 311.8 sec: 5.204503E-02 ( -0.00180271 0.00354602 ) 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 8.660 sec. to 9.660 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96135 ( -0.813669 1.16932 )
Norm@50keV : 9.311539E-04 ( -9.311539E-04 4.996733E-04) )
------------------------------------------------------------
Chi-Squared = 43.86909 using 59 PHA bins.
Reduced chi-squared = 0.7696332 for 57 degrees of freedom
Null hypothesis probability = 0.899
Photon flux (15-150 keV) in 1.000 sec: 0.137249 ( -0.0574572 0.057457 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.57162e-09 ( -4.46571e-09 4.83988e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.660 sec. to 9.660 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66433 ( )
Epeak [keV] : 57.8200 ( )
Norm@50keV : 1.319741E-03 ( )
------------------------------------------------------------
Chi-Squared = 43.93635 using 59 PHA bins.
Reduced chi-squared = 0.7845777 for 56 degrees of freedom
Null hypothesis probability = 0.879
Photon flux (15-150 keV) in 1.000 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 8.660 sec. to 9.660 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.83331 ( -5.29462 8.14236 )
beta : -8.66660 ( -1.16848 0.812396 )
Epeak [keV] : 69.6264 ( -69.5264 9930.37 )
Norm@50keV : 1.078483E-03 ( -7.939851E-02 6.791890E-02) )
------------------------------------------------------------
Chi-Squared = 43.88964 using 59 PHA bins.
Reduced chi-squared = 0.7979934 for 55 degrees of freedom
Null hypothesis probability = 0.859
Photon flux (15-150 keV) in 1.000 sec: 0.137208 ( -0.0575635 0.057438 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Fri Dec 14 11:23:14 EST 2007