batgrbproduct Analysis for Trigger=348112
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): Wed Apr 1 02:20:31 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger348112/GCN5_download_cron
======================================================================
Trigger: 00348112 Segment: 000
BAT Trigger Time: 260203275.328 [s; MET]
Trigger Stop: 260203275.84 [s; MET]
UTC: 2009-03-31T14:41:10.707760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 322.251983535863 Dec: 58.3506494264872 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.64
Image Trigger?: NO
Rate S/N Ratio: 6.40312423743285 [ if not an image trigger ]
Image S/N Ratio: 5.64
Flight Position: [ source = BAT ]
RA: 322.251983535863 Dec: 58.3506494264872 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 322.3744812793 Dec: 58.4091963066339 [deg; J2000]
{ 21h 29m 29.9s , +58d 24' 33.1" }
+/- 3.63559557338823 [arcmin] (estimated 90% radius based on SNR)
+/- 1.89769653382279 [arcmin] (formal 1-sigma fit error)
SNR: 4.81167341834272
Angular difference between Flight and Ground position is 5.214276 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 0.511999994516373 +/-
Measured from: 0
to: 0.511999994516373 [s; relative to TRIGTIME]
T50: 0.511999994516373 +/-
Measured from: 0
to: 0.511999994516373 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.511999994516373 second)
Measured from: -1.49011611938477e-08
to: 0.511999979615211 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.511999994516373 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.010773 0.016307 0.001819 0.004384
0.004083 0.004174 0.003867 0.003672 [error]
Peak 0.010773 0.016307 0.001819 0.004384
0.004083 0.004174 0.003867 0.003672 [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 2.97e-09 4.82e-09 5.92e-09 1.43e-08 1.78e-08 2.90e-08 erg/cm2
Error 1.50e-09 1.79e-09 3.34e-09 1.90e-08 8.10e-09 2.08e-08 erg/cm2
Peak flux Power-law 1.87e-01 1.67e-01 1.03e-01 9.61e-02 4.98e-01 5.54e-01 ph/cm2/s
Error 9.65e-02 6.22e-02 5.64e-02 1.05e-01 1.85e-01 2.14e-01 ph/cm2/s
Fluence Cutoff-PL 2.43e-09 6.99e-09 3.11e-09 7.86e-11 1.26e-08 1.26e-08 erg/cm2
Error 1.41e-09 2.64e-09 3.48e-09 9.13e-09 6.48e-09 1.24e-08 erg/cm2
Peak flux Cutoff-PL 1.46e-01 2.42e-01 6.21e-02 8.95e-04 4.52e-01 4.52e-01 ph/cm2/s
Error 8.91e-02 9.12e-02 7.19e-02 3.57e-02 1.66e-01 1.67e-01 ph/cm2/s
Fluence Band 2.68e-09 6.67e-09 4.08e-09 1.48e-09 1.42e-08 1.82e-08 erg/cm2
Error 2.10e-09 2.50e-09 2.08e-09 1.12e-08 7.09e-09 0.00e+00 erg/cm2
Peak flux Band 1.65e-01 2.16e-01 8.95e-02 2.74e-02 4.88e-01 4.79e-01 ph/cm2/s
Error 1.01e-01 7.84e-02 5.45e-02 7.21e-02 1.76e-01 2.48e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.702 0.649 - - 3.75e-03 1.63e-03 65.894 57
CPL -0.421 0.000 42.3 11.3 7.17e-02 3.59e+00 64.107 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.702 0.649 - - 3.75e-03 1.63e-03 65.894 57
CPL -0.421 0.000 42.3 11.3 7.17e-02 3.59e+00 64.107 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 0.512 0.000 0.512
T90 0.512 0.000 0.512
T50 0.512 0.000 0.512
Peak 0.512 -0.000 0.512
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
322.3745 +58.4092 0.0399 17.0 141.0 0.0385 4.8 TRIG_00348112
------------------------------------------
Foreground time interval of the image:
0.000 0.512 (delta_t = 0.512 [sec])
Background time interval of the image:
-60.328 -3.328 (delta_t = 57.000 [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 0.512 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70153 ( -0.618023 0.679641 )
Norm@50keV : 3.747520E-03 ( -1.650932E-03 1.600991E-03) )
------------------------------------------------------------
Chi-Squared = 65.89351 using 59 PHA bins.
Reduced chi-squared = 1.156026 for 57 degrees of freedom
Null hypothesis probability = 0.196
Photon flux (15-150 keV) in 0.5120 sec: 0.498150 ( -0.185089 0.185122 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.7757e-08 ( -7.70913e-09 8.48589e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.512 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.421191 ( )
Epeak [keV] : 42.3425 ( -9.69381 12.8930 )
Norm@50keV : 7.172264E-02 ( -2.06571 5.12261 )
------------------------------------------------------------
Chi-Squared = 64.10735 using 59 PHA bins.
Reduced chi-squared = 1.144774 for 56 degrees of freedom
Null hypothesis probability = 0.214
Photon flux (15-150 keV) in 0.5120 sec: 0.451815 ( -0.157981 0.174974 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26227e-08 ( -4.70856e-09 8.25958e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.512 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.825873 ( -14.1625 0.837492 )
beta : -2.44484 ( -5.10885 4.16500 )
Epeak [keV] : 52.0085 ( -39.5965 95.7675 )
Norm@50keV : 1.301878E-02 ( -2.15885 85.3981 )
------------------------------------------------------------
Chi-Squared = 64.75419 using 59 PHA bins.
Reduced chi-squared = 1.177349 for 55 degrees of freedom
Null hypothesis probability = 0.173
Photon flux (15-150 keV) in 0.5120 sec: 0.488365 ( -0.175208 0.176403 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41978e-08 ( -5.04479e-09 9.12748e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 0.512 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70153 ( -0.618023 0.679641 )
Norm@50keV : 3.747520E-03 ( -1.650932E-03 1.600991E-03) )
------------------------------------------------------------
Chi-Squared = 65.89351 using 59 PHA bins.
Reduced chi-squared = 1.156026 for 57 degrees of freedom
Null hypothesis probability = 0.196
Photon flux (15-150 keV) in 0.5120 sec: 0.498150 ( -0.185089 0.185122 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.7757e-08 ( -7.70913e-09 8.48589e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.512 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.421191 ( )
Epeak [keV] : 42.3425 ( -9.69381 12.8930 )
Norm@50keV : 7.172264E-02 ( -2.06571 5.12261 )
------------------------------------------------------------
Chi-Squared = 64.10735 using 59 PHA bins.
Reduced chi-squared = 1.144774 for 56 degrees of freedom
Null hypothesis probability = 0.214
Photon flux (15-150 keV) in 0.5120 sec: 0.451815 ( -0.157981 0.174974 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26227e-08 ( -4.70856e-09 8.25958e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.512 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.825873 ( -14.1625 0.837492 )
beta : -2.44484 ( -5.10885 4.16500 )
Epeak [keV] : 52.0085 ( -39.5965 95.7675 )
Norm@50keV : 1.301878E-02 ( -2.15885 85.3981 )
------------------------------------------------------------
Chi-Squared = 64.75419 using 59 PHA bins.
Reduced chi-squared = 1.177349 for 55 degrees of freedom
Null hypothesis probability = 0.173
Photon flux (15-150 keV) in 0.5120 sec: 0.488365 ( -0.175208 0.176403 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41978e-08 ( -5.04479e-09 9.12748e-09 ) ergs/cm2
Plot creation:
Wed Apr 1 02:26:43 EDT 2009