batgrbproduct Analysis for Trigger=349507
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): Sat Apr 18 14:53:59 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger349507/GCN5_download_cron
======================================================================
Trigger: 00349507 Segment: 000
BAT Trigger Time: 261740768.64 [s; MET]
Trigger Stop: 261740772.736 [s; MET]
UTC: 2009-04-18T09:46:03.971100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 323.483436646072 Dec: 18.2371804569387 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.95
Image Trigger?: NO
Rate S/N Ratio: 6.08276253029822 [ if not an image trigger ]
Image S/N Ratio: 5.95
Flight Position: [ source = BAT ]
RA: 323.483436646072 Dec: 18.2371804569387 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 323.442360518963 Dec: 18.2868347173261 [deg; J2000]
{ 21h 33m 46.2s , +18d 17' 12.6" }
+/- 5.98614311531369 [arcmin] (estimated 90% radius based on SNR)
+/- 4.73938946499126 [arcmin] (formal 1-sigma fit error)
SNR: 2.35997956998161
Angular difference between Flight and Ground position is 3.788615 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 4.09600001573563 +/-
Measured from: 0
to: 4.09600001573563 [s; relative to TRIGTIME]
T50: 4.09600001573563 +/-
Measured from: 0
to: 4.09600001573563 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 4.09600001573563 second)
Measured from: 0
to: 4.09600001573563 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 4.09600001573563 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.000860 0.042738 0.024717 -0.021169
0.010233 0.010358 0.009011 0.007684 [error]
Peak 0.000860 0.042738 0.024717 -0.021169
0.010233 0.010358 0.009011 0.007684 [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 5.30e-09 1.08e-08 1.71e-08 6.03e-08 4.75e-08 9.38e-08 erg/cm2
Error 3.14e-09 4.41e-09 7.95e-09 5.69e-08 2.02e-08 6.43e-08 erg/cm2
Peak flux Power-law 4.15e-02 4.61e-02 3.66e-02 4.80e-02 1.42e-01 1.72e-01 ph/cm2/s
Error 2.50e-02 1.92e-02 1.66e-02 4.20e-02 5.59e-02 7.00e-02 ph/cm2/s
Fluence Cutoff-PL 3.13e-09 1.55e-08 1.78e-08 2.26e-09 3.86e-08 3.89e-08 erg/cm2
Error 2.61e-09 6.47e-09 1.10e-08 1.45e-08 1.78e-08 2.24e-08 erg/cm2
Peak flux Cutoff-PL 2.34e-02 6.44e-02 4.10e-02 2.97e-03 1.32e-01 1.32e-01 ph/cm2/s
Error 2.04e-02 2.78e-02 2.34e-02 1.45e-02 5.04e-02 5.10e-02 ph/cm2/s
Fluence Band 3.70e-09 1.48e-08 1.88e-08 4.19e-09 4.11e-08 4.50e-08 erg/cm2
Error 4.38e-09 6.68e-09 4.42e-09 1.21e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 2.43e-02 6.40e-02 4.14e-02 3.31e-03 1.38e-01 1.33e-01 ph/cm2/s
Error 1.58e-02 2.60e-02 2.05e-02 5.23e-02 5.19e-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 1.329 0.578 - - 1.19e-03 4.67e-04 59.755 57
CPL -2.471 1.845 54.5 32.8 1.18e-01 8.81e-02 54.991 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.329 0.578 - - 1.19e-03 4.67e-04 59.755 57
CPL -2.471 1.837 54.5 32.8 1.18e-01 8.81e-02 54.991 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 4.096 0.000 4.096
T90 4.096 0.000 4.096
T50 4.096 0.000 4.096
Peak 4.096 0.000 4.096
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
323.4424 +18.2868 0.0812 14.2 26.4 0.0442 2.4 TRIG_00349507
------------------------------------------
Foreground time interval of the image:
0.000 4.096 (delta_t = 4.096 [sec])
Background time interval of the image:
-60.640 -16.640 (delta_t = 44.000 [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 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32895 ( -0.572283 0.583622 )
Norm@50keV : 1.185407E-03 ( -4.698249E-04 4.637508E-04) )
------------------------------------------------------------
Chi-Squared = 59.75483 using 59 PHA bins.
Reduced chi-squared = 1.048330 for 57 degrees of freedom
Null hypothesis probability = 0.376
Photon flux (15-150 keV) in 4.096 sec: 0.142116 ( -0.0555866 0.056215 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.75173e-08 ( -1.95909e-08 2.07737e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.47068 ( -0.529324 3.16148 )
Epeak [keV] : 54.5178 ( -14.3864 51.2601 )
Norm@50keV : 0.118262 ( -0.118262 5.792325E-02) )
------------------------------------------------------------
Chi-Squared = 54.99085 using 59 PHA bins.
Reduced chi-squared = 0.9819795 for 56 degrees of freedom
Null hypothesis probability = 0.513
Photon flux (15-150 keV) in 4.096 sec: 0.131622 ( -0.0459379 0.054862 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.85956e-08 ( -1.46378e-08 2.10397e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.13539 ( -2.84933 2.86461 )
beta : -9.36666 ( -0.633339 19.3666 )
Epeak [keV] : 58.0662 ( -12.0447 55.0518 )
Norm@50keV : 6.799753E-02 ( -2.29441 0.710983 )
------------------------------------------------------------
Chi-Squared = 55.05277 using 59 PHA bins.
Reduced chi-squared = 1.000960 for 55 degrees of freedom
Null hypothesis probability = 0.473
Photon flux (15-150 keV) in 4.096 sec: 0.137618 ( -0.0511811 0.053323 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.10878e-08 ( -7.32221e-09 1.69452e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32895 ( -0.572283 0.583622 )
Norm@50keV : 1.185407E-03 ( -4.698249E-04 4.637508E-04) )
------------------------------------------------------------
Chi-Squared = 59.75483 using 59 PHA bins.
Reduced chi-squared = 1.048330 for 57 degrees of freedom
Null hypothesis probability = 0.376
Photon flux (15-150 keV) in 4.096 sec: 0.142116 ( -0.0555866 0.056215 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.75173e-08 ( -1.95909e-08 2.07737e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.47068 ( -0.529324 3.14398 )
Epeak [keV] : 54.5178 ( -14.3864 51.2601 )
Norm@50keV : 0.118262 ( -0.118262 5.792325E-02) )
------------------------------------------------------------
Chi-Squared = 54.99085 using 59 PHA bins.
Reduced chi-squared = 0.9819795 for 56 degrees of freedom
Null hypothesis probability = 0.513
Photon flux (15-150 keV) in 4.096 sec: 0.131622 ( -0.0459379 0.054862 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.85956e-08 ( -1.46378e-08 2.10397e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.13539 ( -2.84933 2.86461 )
beta : -9.36666 ( -0.633339 19.3666 )
Epeak [keV] : 58.0662 ( -12.0447 55.0518 )
Norm@50keV : 6.799753E-02 ( -2.29441 0.710983 )
------------------------------------------------------------
Chi-Squared = 55.05277 using 59 PHA bins.
Reduced chi-squared = 1.000960 for 55 degrees of freedom
Null hypothesis probability = 0.473
Photon flux (15-150 keV) in 4.096 sec: 0.137618 ( -0.0511811 0.053323 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.10878e-08 ( -7.32221e-09 1.69452e-08 ) ergs/cm2
Plot creation:
Sat Apr 18 15:07:00 EDT 2009