batgrbproduct Analysis for Trigger=344564
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 v2.42
Process Start Time (local time): Sun Mar 1 15:37:56 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger344564/GCN5_download_cron
======================================================================
Trigger: 00344564 Segment: 000
BAT Trigger Time: 257567410.24 [s; MET]
Trigger Stop: 257567411.264 [s; MET]
UTC: 2009-03-01T02:30:05.702440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 51.1309464188569 Dec: -71.2146885528417 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.84
Image Trigger?: NO
Rate S/N Ratio: 29.732137494637 [ if not an image trigger ]
Image S/N Ratio: 5.84
Flight Position: [ source = BAT ]
RA: 51.1309464188569 Dec: -71.2146885528417 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 50.9939125917018 Dec: -71.2056515197589 [deg; J2000]
{ 03h 23m 58.5s , -71d 12' 20.3" }
+/- 5.9120695280274 [arcmin] (estimated 90% radius based on SNR)
+/- 3.24077949348771 [arcmin] (formal 1-sigma fit error)
SNR: 2.40233369667415
Angular difference between Flight and Ground position is 2.703234 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.009484 0.001569 0.031229 0.025699
0.007845 0.008799 0.009520 0.011378 [error]
Peak -0.009484 0.001569 0.031229 0.025699
0.007845 0.008799 0.009520 0.011378 [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 1.02e-11 3.19e-09 1.44e-08 2.65e-07 4.45e-08 3.11e-07 erg/cm2
Error 3.41e-09 1.14e-08 4.20e-07 3.50e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Power-law 1.85e-02 5.15e-02 1.17e-01 7.04e-01 3.14e-01 8.93e-01 ph/cm2/s
Error 3.17e-02 5.64e-02 9.16e-02 8.91e-01 2.53e-01 8.66e-01 ph/cm2/s
Fluence Cutoff-PL 3.14e-10 3.75e-09 2.06e-08 3.98e-08 4.58e-08 1.13e-07 erg/cm2
Error 3.90e-09 1.05e-08 1.84e-07 3.59e-08 2.88e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 9.68e-03 5.98e-02 1.69e-01 1.61e-01 3.42e-01 3.99e-01 ph/cm2/s
Error 1.80e-02 6.18e-02 8.80e-02 4.69e-01 1.72e-01 2.95e-01 ph/cm2/s
Fluence Band 2.75e-10 4.05e-09 2.27e-08 2.46e-08 4.40e-08 6.85e-08 erg/cm2
Error 1.10e-08 2.59e-08 1.74e-08 5.14e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 7.45e-03 4.82e-02 1.87e-01 1.18e-01 3.32e-01 3.91e-01 ph/cm2/s
Error 4.33e-02 9.07e-02 4.27e-01 1.61e-01 6.45e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.180 1.877 - - 2.17e-03 2.00e-03 48.644 57
CPL -2.500 0.000 129.0 109.6 1.74e-02 6.12e-02 46.216 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.180 1.877 - - 2.17e-03 2.00e-03 48.644 57
CPL -2.500 0.000 129.0 109.6 1.74e-02 6.12e-02 46.216 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
50.9939 -71.2057 0.0803 28.8 -22.1 0.0489 2.4 TRIG_00344564
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.240 -34.259 (delta_t = 25.981 [sec])
-33.240 -10.240 (delta_t = 23.000 [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 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.180008 ( -2.81999 0.933719 )
Norm@50keV : 2.167247E-03 ( -2.167247E-03 1.834698E-03) )
------------------------------------------------------------
Chi-Squared = 48.64380 using 59 PHA bins.
Reduced chi-squared = 0.8534001 for 57 degrees of freedom
Null hypothesis probability = 0.777
Photon flux (15-150 keV) in 1.024 sec: 0.314422 ( -0.314422 0.191648 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.45212e-08 ( -4.45212e-08 2.55418e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49992 ( )
Epeak [keV] : 128.954 ( -115.360 103.874 )
Norm@50keV : 1.736852E-02 ( -2.804581E-02 9.437002E-02) )
------------------------------------------------------------
Chi-Squared = 46.21647 using 59 PHA bins.
Reduced chi-squared = 0.8252941 for 56 degrees of freedom
Null hypothesis probability = 0.821
Photon flux (15-150 keV) in 1.024 sec: 0.341921 ( -0.171814 0.171829 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.57914e-08 ( -4.57914e-08 2.60197e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38428 ( -4.31254 2.403212E-02) )
beta : -9.19671 ( -0.697440 9.67527 )
Epeak [keV] : 98.8173 ( -98.7045 135.793 )
Norm@50keV : 8.955492E-02 ( -0.112307 1.24476 )
------------------------------------------------------------
Chi-Squared = 45.31512 using 59 PHA bins.
Reduced chi-squared = 0.8239113 for 55 degrees of freedom
Null hypothesis probability = 0.821
Photon flux (15-150 keV) in 1.024 sec: 0.332428 ( -0.160749 0.160718 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.40149e-08 ( -2.13565e-08 1.35382e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.180008 ( -2.81999 0.933719 )
Norm@50keV : 2.167247E-03 ( -2.167247E-03 1.834698E-03) )
------------------------------------------------------------
Chi-Squared = 48.64380 using 59 PHA bins.
Reduced chi-squared = 0.8534001 for 57 degrees of freedom
Null hypothesis probability = 0.777
Photon flux (15-150 keV) in 1.024 sec: 0.314422 ( -0.314422 0.191648 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.45212e-08 ( -4.45212e-08 2.55418e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49992 ( )
Epeak [keV] : 128.954 ( -115.360 103.874 )
Norm@50keV : 1.736852E-02 ( -2.804581E-02 9.437002E-02) )
------------------------------------------------------------
Chi-Squared = 46.21647 using 59 PHA bins.
Reduced chi-squared = 0.8252941 for 56 degrees of freedom
Null hypothesis probability = 0.821
Photon flux (15-150 keV) in 1.024 sec: 0.341921 ( -0.171814 0.171829 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.57914e-08 ( -4.57914e-08 2.60197e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38428 ( -4.31254 2.403212E-02) )
beta : -9.19671 ( -0.697440 9.67599 )
Epeak [keV] : 98.8173 ( -98.7045 135.793 )
Norm@50keV : 8.955492E-02 ( -0.112307 1.24476 )
------------------------------------------------------------
Chi-Squared = 45.31512 using 59 PHA bins.
Reduced chi-squared = 0.8239113 for 55 degrees of freedom
Null hypothesis probability = 0.821
Photon flux (15-150 keV) in 1.024 sec: 0.332428 ( -0.160749 0.160718 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.40149e-08 ( -2.13565e-08 1.35382e-08 ) ergs/cm2
Plot creation:
Sun Mar 1 15:47:59 EST 2009