batgrbproduct Analysis for Trigger=356251
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 v2.45
Process Start Time (local time): Thu Jul 2 15:31:34 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger356251/GCN5_download_cron
======================================================================
Trigger: 00356251 Segment: 000
BAT Trigger Time: 268198621.924 [s; MET]
Trigger Stop: 268198621.988 [s; MET]
UTC: 2009-07-02T03:36:57.048580 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 12.8135875358097 Dec: 41.8728191764414 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.83
Image Trigger?: NO
Rate S/N Ratio: 8 [ if not an image trigger ]
Image S/N Ratio: 5.83
Flight Position: [ source = BAT ]
RA: 12.8135875358097 Dec: 41.8728191764414 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 12.8361363933883 Dec: 41.9033842580914 [deg; J2000]
{ 00h 51m 20.7s , +41d 54' 12.2" }
+/- 4.39430812165936 [arcmin] (estimated 90% radius based on SNR)
+/- 2.66941892176384 [arcmin] (formal 1-sigma fit error)
SNR: 3.67031528126894
Angular difference between Flight and Ground position is 2.092281 arcmin
Partial Coding Fraction: 0.3632812 [ including projection effects ]
Duration
T90: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
T50: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0640000104904175 second)
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.003132 0.000263 0.006015 0.009912
0.002187 0.002568 0.002312 0.002707 [error]
Peak 0.003132 0.000263 0.006015 0.009912
0.002187 0.002568 0.002312 0.002707 [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 1.38e-10 7.60e-10 3.63e-09 7.31e-08 1.14e-08 7.76e-08 erg/cm2
Error 3.28e-10 9.66e-10 2.86e-09 1.21e-07 5.73e-09 1.23e-07 erg/cm2
Peak flux Power-law 6.68e-02 1.96e-01 4.68e-01 3.08e+00 1.27e+00 3.81e+00 ph/cm2/s
Error 1.63e-01 2.58e-01 3.75e-01 4.16e+00 1.03e+00 3.99e+00 ph/cm2/s
Fluence Cutoff-PL 6.92e-11 5.84e-11 5.92e-10 4.19e-09 2.06e-08 1.17e-08 erg/cm2
Error 6.18e-10 3.43e-09 1.48e-07 8.80e-09 1.29e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 6.65e-02 1.96e-01 4.69e-01 3.06e+00 1.27e+00 3.80e+00 ph/cm2/s
Error 1.62e-01 2.58e-01 3.75e-01 4.59e+00 1.03e+00 4.40e+00 ph/cm2/s
Fluence Band 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 Band 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
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.257 1.839 - - 8.46e-03 8.55e-03 43.980 57
CPL -3.129 0.000 154.2 149.5 3.95e-02 0.00e+00 43.750 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.257 1.839 - - 8.46e-03 8.55e-03 43.980 57
CPL -3.129 0.000 154.2 149.5 3.95e-02 0.00e+00 43.750 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 0.064 0.000 0.064
T90 0.064 0.000 0.064
T50 0.064 0.000 0.064
Peak 0.064 0.000 0.064
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
12.8361 +41.9034 0.0522 46.9 -15.3 0.0185 3.7 TRIG_00356251
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.924 -5.924 (delta_t = 55.000 [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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.256901 ( -2.53017 1.14847 )
Norm@50keV : 8.46421E-03 ( -0.00846531 0.00863055 )
------------------------------------------------------------
# Chi-Squared = 43.98 using 59 PHA bins.
# Reduced chi-squared = 0.7716 for 57 degrees of freedom
# Null hypothesis probability = 8.966893e-01
Photon flux (15-150 keV) in 0.064 sec: 1.26545 ( -1.26545 0.788831 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14098e-08 ( -5.7266e-09 5.72586e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.12928 ( )
Epeak [keV] : 154.158 ( -132.486 166.562 )
Norm@50keV : 3.94740E-02 ( )
------------------------------------------------------------
# Chi-Squared = 43.75 using 59 PHA bins.
# Reduced chi-squared = 0.7812 for 56 degrees of freedom
# Null hypothesis probability = 8.831525e-01
Photon flux (15-150 keV) in 0.064 sec: 1.26619 ( -1.26619 0.78753 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17078e-08 ( -1.17078e-08 5.88461e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.28679 ( 0.321301 0.321301 )
beta : -0.641555 ( 1.80334 4.37678 )
Epeak [keV] : 143.609 ( -143.835 411.193 )
Norm@50keV : 4.82294E-02 ( -0.0482778 1.17642 )
------------------------------------------------------------
# Chi-Squared = 43.73 using 59 PHA bins.
# Reduced chi-squared = 0.7951 for 55 degrees of freedom
# Null hypothesis probability = 8.628771e-01
Photon flux (15-150 keV) in 0.064 sec: ( ) 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 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.256901 ( -2.53017 1.14847 )
Norm@50keV : 8.46421E-03 ( -0.00846531 0.00863055 )
------------------------------------------------------------
# Chi-Squared = 43.98 using 59 PHA bins.
# Reduced chi-squared = 0.7716 for 57 degrees of freedom
# Null hypothesis probability = 8.966893e-01
Photon flux (15-150 keV) in 0.064 sec: 1.26545 ( -1.26545 0.788831 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14098e-08 ( -5.7266e-09 5.72586e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.12928 ( )
Epeak [keV] : 154.158 ( -132.486 166.562 )
Norm@50keV : 3.94740E-02 ( )
------------------------------------------------------------
# Chi-Squared = 43.75 using 59 PHA bins.
# Reduced chi-squared = 0.7812 for 56 degrees of freedom
# Null hypothesis probability = 8.831525e-01
Photon flux (15-150 keV) in 0.064 sec: 1.26619 ( -1.26619 0.78753 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17078e-08 ( -1.17078e-08 5.88461e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.28679 ( 0.321301 0.321301 )
beta : -0.641555 ( 1.80334 4.37678 )
Epeak [keV] : 143.609 ( -143.835 411.193 )
Norm@50keV : 4.82294E-02 ( -0.0482778 1.17642 )
------------------------------------------------------------
# Chi-Squared = 43.73 using 59 PHA bins.
# Reduced chi-squared = 0.7951 for 55 degrees of freedom
# Null hypothesis probability = 8.628771e-01
Photon flux (15-150 keV) in 0.064 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Thu Jul 2 15:45:47 EDT 2009