batgrbproduct Analysis for Trigger=349248
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 v2.44
Process Start Time (local time): Tue Apr 14 15:49:41 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger349248/GCN5_download_cron
======================================================================
Trigger: 00349248 Segment: 000
BAT Trigger Time: 261406550.248 [s; MET]
Trigger Stop: 261406550.312 [s; MET]
UTC: 2009-04-14T12:55:45.589680 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 54.9874881495206 Dec: -36.2048706476311 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.63
Image Trigger?: NO
Rate S/N Ratio: 8 [ if not an image trigger ]
Image S/N Ratio: 5.63
Flight Position: [ source = BAT ]
RA: 54.9874881495206 Dec: -36.2048706476311 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 54.9684244177189 Dec: -36.1433393662957 [deg; J2000]
{ 03h 39m 52.4s , -36d 08' 36.0" }
+/- 5.56514733447898 [arcmin] (estimated 90% radius based on SNR)
+/- 4.09043279207415 [arcmin] (formal 1-sigma fit error)
SNR: 2.61909778626341
Angular difference between Flight and Ground position is 3.805586 arcmin
Partial Coding Fraction: 0.8984375 [ 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 0.000626 -0.001455 0.003932 0.004998
0.001436 0.001435 0.001284 0.001376 [error]
Peak 0.000626 -0.001455 0.003932 0.004998
0.001436 0.001435 0.001284 0.001376 [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 1.24e-10 4.23e-10 1.20e-09 1.03e-08 3.29e-09 1.23e-08 erg/cm2
Error 2.44e-10 4.98e-10 9.56e-10 1.69e-08 2.95e-09 1.46e-08 erg/cm2
Peak flux Power-law 6.05e-02 1.12e-01 1.58e-01 4.73e-01 4.53e-01 8.02e-01 ph/cm2/s
Error 1.23e-01 1.36e-01 1.42e-01 6.86e-01 4.37e-01 7.27e-01 ph/cm2/s
Fluence Cutoff-PL 3.18e-11 3.60e-10 1.83e-09 3.03e-09 3.94e-09 5.26e-09 erg/cm2
Error 6.73e-11 3.80e-10 1.19e-09 3.06e-09 2.60e-09 3.67e-09 erg/cm2
Peak flux Cutoff-PL 6.04e-02 1.12e-01 1.59e-01 4.70e-01 4.53e-01 8.02e-01 ph/cm2/s
Error 1.23e-01 1.36e-01 1.27e-01 6.37e-01 4.34e-01 7.24e-01 ph/cm2/s
Fluence Band 2.87e-11 3.76e-10 1.99e-09 2.73e-09 4.12e-09 5.48e-09 erg/cm2
Error 1.61e-09 2.15e-09 3.18e-09 4.05e-09 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 5.19e-03 6.51e-02 2.61e-01 1.94e-01 4.75e-01 4.97e-01 ph/cm2/s
Error 2.95e-02 7.27e-02 1.58e-01 2.98e-01 2.88e-01 4.22e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.517 2.433 - - 3.89e-03 3.84e-03 62.442 57
CPL -2.500 0.000 107.4 104.4 4.32e-02 1.22e-01 60.197 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.517 2.433 - - 3.89e-03 3.84e-03 62.442 57
CPL -2.500 0.000 107.4 104.4 4.32e-02 1.22e-01 60.197 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 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
54.9684 -36.1433 0.0734 26.7 -171.0 0.0071 2.6 TRIG_00349248
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.248 -6.248 (delta_t = 54.000 [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: 0.517404 ( -3.51740 1.34837 )
Norm@50keV : 3.890461E-03 ( -3.890461E-03 3.779759E-03) )
------------------------------------------------------------
Chi-Squared = 62.44217 using 59 PHA bins.
Reduced chi-squared = 1.095477 for 57 degrees of freedom
Null hypothesis probability = 0.289
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.452629 ( -0.445559 0.429043 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.28782e-09 ( -3.28782e-09 2.61709e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49998 ( )
Epeak [keV] : 107.415 ( -116.698 92.0086 )
Norm@50keV : 4.321826E-02 ( -3.729412E-02 0.206669 )
------------------------------------------------------------
Chi-Squared = 60.19718 using 59 PHA bins.
but latest trial 208.717 gives Chi-Squared = 1.59057
Reduced chi-squared = 1.074950 for 56 degrees of freedom
Null hypothesis probability = 0.326
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.452925 ( -0.438809 0.428508 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.94181e-09 ( -2.56504e-09 2.642e-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 : 4.38550 ( -14.9999 1.955032E-05) )
beta : -9.33354 ( )
Epeak [keV] : 114.222 ( )
Norm@50keV : 6.155906E-02 ( )
------------------------------------------------------------
Chi-Squared = 59.36334 using 59 PHA bins.
Reduced chi-squared = 1.079333 for 55 degrees of freedom
Null hypothesis probability = 0.320
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.475297 ( -0.287841 0.28813 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.11555e-09 ( -2.50206e-09 3.86384e-09 ) 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: 0.517404 ( -3.51740 1.34837 )
Norm@50keV : 3.890461E-03 ( -3.890461E-03 3.779759E-03) )
------------------------------------------------------------
Chi-Squared = 62.44217 using 59 PHA bins.
Reduced chi-squared = 1.095477 for 57 degrees of freedom
Null hypothesis probability = 0.289
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.452629 ( -0.445559 0.429043 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.28782e-09 ( -3.28782e-09 2.61709e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49998 ( )
Epeak [keV] : 107.415 ( -116.698 92.0086 )
Norm@50keV : 4.321826E-02 ( -3.729412E-02 0.206669 )
------------------------------------------------------------
Chi-Squared = 60.19718 using 59 PHA bins.
but latest trial 208.717 gives Chi-Squared = 1.59057
Reduced chi-squared = 1.074950 for 56 degrees of freedom
Null hypothesis probability = 0.326
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.452925 ( -0.438809 0.428508 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.94181e-09 ( -2.56504e-09 2.642e-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 : 4.38550 ( -5.14842 1.525879E-05) )
beta : -9.33354 ( )
Epeak [keV] : 114.222 ( )
Norm@50keV : 6.155906E-02 ( )
------------------------------------------------------------
Chi-Squared = 59.36334 using 59 PHA bins.
Reduced chi-squared = 1.079333 for 55 degrees of freedom
Null hypothesis probability = 0.320
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.475297 ( -0.287841 0.28813 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.11555e-09 ( -2.50206e-09 3.86384e-09 ) ergs/cm2
Plot creation:
Tue Apr 14 16:28:05 EDT 2009