batgrbproduct Analysis for Trigger=306616
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): Tue Mar 18 05:36:09 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger306616/GCN5_download_cron
======================================================================
Trigger: 00306616 Segment: 000
BAT Trigger Time: 227489520 [s; MET]
Trigger Stop: 227489584 [s; MET]
UTC: 2008-03-17T23:31:57.349340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 244.626021939135 Dec: -15.2512871678609 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.41
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 16.41
Flight Position: [ source = BAT ]
RA: 244.626021939135 Dec: -15.2512871678609 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.622977952106 Dec: -15.2561698093725 [deg; J2000]
{ 16h 18m 29.5s , -15d 15' 22.2" }
+/- 1.50874464893122 [arcmin] (estimated 90% radius based on SNR)
+/- 0.672927725016618 [arcmin] (formal 1-sigma fit error)
SNR: 16.9025812845809
RA = 16h 18m 29.5s (244.622978 deg.)
Dec = -15d 15' 22" (-15.256170 deg.)
Angular difference between Flight and Ground position is 0.341867 arcmin
Partial Coding Fraction: 0.5 [ 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 1.505196 0.131786 0.011651 0.020954
0.053281 0.049992 0.044352 0.039524 [error]
Peak 1.505196 0.131786 0.011651 0.020954
0.053281 0.049992 0.044352 0.039524 [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 4.96e-07 6.44e-08 3.67e-09 2.21e-10 5.64e-07 5.64e-07 erg/cm2
Error 6.25e-08 2.01e-08 2.75e-09 2.98e-10 6.89e-08 6.89e-08 erg/cm2
Peak flux Power-law 2.74e-01 2.09e-02 5.95e-04 1.74e-05 2.95e-01 2.95e-01 ph/cm2/s
Error 3.53e-02 6.21e-03 5.77e-04 2.55e-05 3.64e-02 3.64e-02 ph/cm2/s
Fluence Cutoff-PL 4.95e-07 6.44e-08 3.67e-09 2.19e-10 5.64e-07 5.64e-07 erg/cm2
Error 6.24e-08 2.01e-08 2.74e-09 2.95e-10 6.88e-08 6.88e-08 erg/cm2
Peak flux Cutoff-PL 2.73e-01 2.08e-02 5.93e-04 1.73e-05 2.95e-01 2.95e-01 ph/cm2/s
Error 3.53e-02 6.20e-03 5.75e-04 2.53e-05 3.63e-02 3.63e-02 ph/cm2/s
Fluence Band 1.43e-07 1.43e-07 8.59e-08 9.50e-09 6.75e-07 4.94e-07 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 Band 2.73e-01 2.08e-02 5.93e-04 8.11e-06 2.96e-01 2.95e-01 ph/cm2/s
Error 3.53e-02 6.20e-03 5.75e-04 2.13e-05 2.73e-02 3.63e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 6.131 0.596 - - 6.29e-05 3.83e-05 46.663 57
CPL 1.680 0.596 1.4 5.5 3.76e-01 7.87e+02 44.907 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 6.131 0.596 - - 6.29e-05 3.83e-05 46.663 57
CPL 1.680 0.596 1.4 5.5 3.76e-01 7.87e+02 44.907 0
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
244.6230 -15.2562 0.0114 28.5 -71.3 1.7300 16.9 TRIG_00306616
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.13135 ( -0.579580 0.612247 )
Norm@50keV : 6.286219E-05 ( -2.942442E-05 4.712958E-05) )
------------------------------------------------------------
Chi-Squared = 46.66294 using 59 PHA bins.
Reduced chi-squared = 0.8186481 for 57 degrees of freedom
Null hypothesis probability = 0.834
Photon flux (15-150 keV) in 64.00 sec: 0.295260 ( -0.036388 0.036393 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.63949e-07 ( -6.88518e-08 6.88896e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68036 ( -0.962582 0.228903 )
Epeak [keV] : 1.41309 ( -1.40309 9.54838 )
Norm@50keV : 0.375893 ( -0.260631 1573.60 )
------------------------------------------------------------
Chi-Squared = 44.90739 using 59 PHA bins.
but latest trial 10.8914 gives Chi-Squared = 13.1732
Reduced chi-squared = 0.8019176 for 56 degrees of freedom
Null hypothesis probability = 0.856
Photon flux (15-150 keV) in 64.00 sec: 0.294884 ( -0.036333 0.036335 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.63548e-07 ( -6.8823e-08 6.8841e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.29285 ( -0.707151 2.55138 )
beta : -6.13185 ( -0.611373 0.580801 )
Epeak [keV] : 376.629 ( -376.529 9623.37 )
Norm@50keV : 8.539796E-03 ( -3.997327E-03 6.410439E-03) )
------------------------------------------------------------
Chi-Squared = 46.66294 using 59 PHA bins.
Reduced chi-squared = 0.8484171 for 55 degrees of freedom
Null hypothesis probability = 0.781
Photon flux (15-150 keV) in 64.00 sec: 0.295855 ( -0.036339 0.018289 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.75296e-07 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.13135 ( -0.579580 0.612247 )
Norm@50keV : 6.286219E-05 ( -2.942442E-05 4.712958E-05) )
------------------------------------------------------------
Chi-Squared = 46.66294 using 59 PHA bins.
Reduced chi-squared = 0.8186481 for 57 degrees of freedom
Null hypothesis probability = 0.834
Photon flux (15-150 keV) in 64.00 sec: 0.295260 ( -0.036388 0.036393 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.63949e-07 ( -6.88518e-08 6.88896e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.68036 ( -0.962584 0.228926 )
Epeak [keV] : 1.41309 ( -1.40309 9.54838 )
Norm@50keV : 0.375893 ( -0.260631 1573.60 )
------------------------------------------------------------
Chi-Squared = 44.90739 using 59 PHA bins.
but latest trial 0.717763 gives Chi-Squared = 126.077
but latest trial 10.8914 gives Chi-Squared = 13.1732
Reduced chi-squared = 0.8019176 for 56 degrees of freedom
Null hypothesis probability = 0.856
Photon flux (15-150 keV) in 64.00 sec: 0.294884 ( -0.036333 0.036335 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.63548e-07 ( -6.8823e-08 6.8841e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.29285 ( -0.707151 2.55138 )
beta : -6.13185 ( -0.611373 0.580801 )
Epeak [keV] : 376.629 ( -376.529 9623.37 )
Norm@50keV : 8.539796E-03 ( -3.997327E-03 6.410439E-03) )
------------------------------------------------------------
Chi-Squared = 46.66294 using 59 PHA bins.
Reduced chi-squared = 0.8484171 for 55 degrees of freedom
Null hypothesis probability = 0.781
Photon flux (15-150 keV) in 64.00 sec: 0.295855 ( -0.036339 0.018289 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.75296e-07 ( 0 0 ) ergs/cm2
Plot creation:
Tue Mar 18 05:53:35 EDT 2008