batgrbproduct Analysis for Trigger=351808
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): Wed May 13 18:54:58 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger351808/GCN5_download_cron
======================================================================
Trigger: 00351808 Segment: 000
BAT Trigger Time: 263869947.2 [s; MET]
Trigger Stop: 263869951.296 [s; MET]
UTC: 2009-05-13T01:12:22.463540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 32.8005478712337 Dec: -22.4401645861588 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.03
Image Trigger?: NO
Rate S/N Ratio: 16.062378404209 [ if not an image trigger ]
Image S/N Ratio: 6.03
Flight Position: [ source = BAT ]
RA: 32.8005478712337 Dec: -22.4401645861588 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 32.8887150418553 Dec: -22.2833965921242 [deg; J2000]
{ 02h 11m 33.3s , -22d 17' 00.2" }
+/- 7.05065376567054 [arcmin] (estimated 90% radius based on SNR)
+/- 7.41706830016214 [arcmin] (formal 1-sigma fit error)
SNR: 1.86793651022282
Angular difference between Flight and Ground position is 10.602270 arcmin
Partial Coding Fraction: 0.828125 [ 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 0.056484 0.006023 -0.021552 0.013039
0.010946 0.010797 0.009619 0.008548 [error]
Peak 0.056484 0.006023 -0.021552 0.013039
0.010946 0.010797 0.009619 0.008548 [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 1.26e-08 5.16e-09 1.24e-09 3.64e-10 1.92e-08 1.92e-08 erg/cm2
Error 4.80e-09 4.83e-09 2.15e-09 1.41e-09 9.86e-09 1.03e-08 erg/cm2
Peak flux Power-law 1.05e-01 2.45e-02 2.95e-03 3.96e-04 1.32e-01 1.34e-01 ph/cm2/s
Error 3.98e-02 1.81e-02 4.93e-03 1.40e-03 5.51e-02 5.54e-02 ph/cm2/s
Fluence Cutoff-PL 1.26e-08 5.17e-09 1.24e-09 3.61e-10 1.93e-08 1.95e-08 erg/cm2
Error 4.80e-09 4.84e-09 2.15e-09 1.40e-09 9.87e-09 1.03e-08 erg/cm2
Peak flux Cutoff-PL 1.05e-01 2.45e-02 2.95e-03 3.93e-04 1.32e-01 1.32e-01 ph/cm2/s
Error 3.98e-02 1.81e-02 4.93e-03 1.39e-03 5.51e-02 5.53e-02 ph/cm2/s
Fluence Band 1.25e-08 5.51e-09 1.45e-09 5.02e-10 2.14e-08 2.05e-08 erg/cm2
Error 4.76e-09 2.33e-09 1.25e-09 2.12e-09 1.11e-08 0.00e+00 erg/cm2
Peak flux Band 1.15e-01 2.43e-02 1.75e-03 5.38e-05 1.47e-01 1.41e-01 ph/cm2/s
Error 4.82e-02 9.22e-03 2.54e-03 3.70e-04 5.71e-02 5.19e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.914 1.279 - - 2.36e-04 2.74e-04 70.376 57
CPL -2.452 0.000 16.5 10.8 2.46e+01 0.00e+00 66.193 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.914 1.279 - - 2.36e-04 2.74e-04 70.376 57
CPL -2.452 0.000 16.5 10.8 2.46e+01 0.00e+00 66.193 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
32.8887 -22.2834 0.1027 22.5 -132.5 0.0375 1.9 TRIG_00351808
------------------------------------------
Foreground time interval of the image:
0.000 4.096 (delta_t = 4.096 [sec])
Background time interval of the image:
-60.200 -19.200 (delta_t = 41.000 [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: 3.91359 ( -0.862861 1.69481 )
Norm@50keV : 2.362131E-04 ( -2.362131E-04 3.123310E-04) )
------------------------------------------------------------
Chi-Squared = 70.37614 using 59 PHA bins.
Reduced chi-squared = 1.234669 for 57 degrees of freedom
Null hypothesis probability = 0.110
Photon flux (15-150 keV) in 4.096 sec: 0.132486 ( -0.0537047 0.056445 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92295e-08 ( -8.8594e-09 1.08662e-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: -2.45220 ( )
Epeak [keV] : 16.5148 ( -17.0822 4.56918 )
Norm@50keV : 24.5771 ( )
------------------------------------------------------------
Chi-Squared = 66.19335 using 59 PHA bins.
Reduced chi-squared = 1.182024 for 56 degrees of freedom
Null hypothesis probability = 0.165
Photon flux (15-150 keV) in 4.096 sec: 0.132423 ( -0.0537686 0.056457 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92545e-08 ( -8.89139e-09 1.08422e-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 : -1.87178 ( -3.31523 4.80077 )
beta : -3.83968 ( -1.48598 1.05564 )
Epeak [keV] : 12.8566 ( -12.7566 9987.14 )
Norm@50keV : 1.134439E-03 ( -2.152051E-02 4.804176E-02) )
------------------------------------------------------------
Chi-Squared = 80.56231 using 59 PHA bins.
Reduced chi-squared = 1.464769 for 55 degrees of freedom
Null hypothesis probability = 1.394E-02
Photon flux (15-150 keV) in 4.096 sec: 0.146703 ( -0.0507923 0.063474 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14137e-08 ( -9.89377e-09 1.22755e-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: 3.91359 ( -0.862861 1.69481 )
Norm@50keV : 2.362131E-04 ( -2.362131E-04 3.123310E-04) )
------------------------------------------------------------
Chi-Squared = 70.37614 using 59 PHA bins.
Reduced chi-squared = 1.234669 for 57 degrees of freedom
Null hypothesis probability = 0.110
Photon flux (15-150 keV) in 4.096 sec: 0.132486 ( -0.0537047 0.056445 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92295e-08 ( -8.8594e-09 1.08662e-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: -2.45220 ( )
Epeak [keV] : 16.5148 ( -17.0822 4.56918 )
Norm@50keV : 24.5771 ( )
------------------------------------------------------------
Chi-Squared = 66.19335 using 59 PHA bins.
Reduced chi-squared = 1.182024 for 56 degrees of freedom
Null hypothesis probability = 0.165
Photon flux (15-150 keV) in 4.096 sec: 0.132423 ( -0.0537686 0.056457 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92545e-08 ( -8.89139e-09 1.08422e-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 : -1.87178 ( -3.31523 4.80077 )
beta : -3.83968 ( -1.48598 1.05566 )
Epeak [keV] : 12.8566 ( -12.7566 9987.14 )
Norm@50keV : 1.134439E-03 ( -2.152051E-02 4.804176E-02) )
------------------------------------------------------------
Chi-Squared = 80.56231 using 59 PHA bins.
Reduced chi-squared = 1.464769 for 55 degrees of freedom
Null hypothesis probability = 1.394E-02
Photon flux (15-150 keV) in 4.096 sec: 0.146703 ( -0.0507923 0.063474 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14137e-08 ( -9.89377e-09 1.22755e-08 ) ergs/cm2
Plot creation:
Wed May 13 19:05:08 EDT 2009