batgrbproduct Analysis for Trigger=351017
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 May 2 04:29:31 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger351017/GCN5_download_cron
======================================================================
Trigger: 00351017 Segment: 000
BAT Trigger Time: 262892203.072 [s; MET]
Trigger Stop: 262892204.096 [s; MET]
UTC: 2009-05-01T17:36:38.366700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 72.4895235396628 Dec: 0.839252011837203 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.75
Image Trigger?: NO
Rate S/N Ratio: 9.79795897113271 [ if not an image trigger ]
Image S/N Ratio: 5.75
Flight Position: [ source = BAT ]
RA: 72.4895235396628 Dec: 0.839252011837203 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 72.4661716177821 Dec: 0.854021837664144 [deg; J2000]
{ 04h 49m 51.9s , +00d 51' 14.5" }
+/- 4.48060282505213 [arcmin] (estimated 90% radius based on SNR)
+/- 3.19395328508045 [arcmin] (formal 1-sigma fit error)
SNR: 3.5697494837331
Angular difference between Flight and Ground position is 1.657718 arcmin
Partial Coding Fraction: 0.9140625 [ 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 0.013164 -0.003220 0.012135 0.023775
0.005675 0.005960 0.005689 0.005936 [error]
Peak 0.013164 -0.003220 0.012135 0.023775
0.005675 0.005960 0.005689 0.005936 [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 1.93e-11 2.92e-10 4.08e-09 5.12e-07 2.06e-08 3.02e-07 erg/cm2
Error 6.13e-10 1.96e-09 6.44e-09 3.93e-07 2.10e-08 0.00e+00 erg/cm2
Peak flux Power-law 5.64e-04 4.46e-03 3.12e-02 1.18e+00 1.13e-01 1.22e+00 ph/cm2/s
Error 1.90e-02 3.25e-02 5.22e-02 9.13e-01 1.41e-01 9.45e-01 ph/cm2/s
Fluence Cutoff-PL 1.35e-11 2.33e-10 3.71e-09 5.78e-07 2.00e-08 1.38e-07 erg/cm2
Error 5.85e-10 1.91e-09 6.38e-09 4.45e-07 2.09e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 3.96e-04 3.53e-03 2.81e-02 1.32e+00 1.08e-01 1.35e+00 ph/cm2/s
Error 1.81e-02 3.16e-02 5.16e-02 1.02e+00 1.39e-01 1.05e+00 ph/cm2/s
Fluence Band 1.30e-11 2.47e-11 1.30e-09 1.38e-06 1.37e-08 4.23e-07 erg/cm2
Error 1.56e-09 5.77e-09 1.08e-06 1.92e-08 2.24e-07 0.00e+00 erg/cm2
Peak flux Band 4.02e-06 1.70e-04 6.66e-03 4.24e+00 5.71e-02 1.35e+00 ph/cm2/s
Error 9.67e-03 2.23e-02 4.23e-02 3.68e+00 1.21e-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 -0.923 1.942 - - 8.14e-04 0.00e+00 55.630 57
CPL -1.223 0.000 9999.2 5000.0 6.67e-04 1.05e-03 55.550 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.923 1.942 - - 8.14e-04 0.00e+00 55.630 57
CPL -1.223 0.000 9999.2 5000.0 6.67e-04 1.05e-03 55.550 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
72.4662 +0.8540 0.0536 16.6 -55.0 0.0444 3.6 TRIG_00351017
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-33.871 -11.072 (delta_t = 22.799 [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: -0.922951 ( -2.07705 1.80712 )
Norm@50keV : 8.139887E-04 ( )
------------------------------------------------------------
Chi-Squared = 55.63042 using 59 PHA bins.
Reduced chi-squared = 0.9759723 for 57 degrees of freedom
Null hypothesis probability = 0.527
Photon flux (15-150 keV) in 1.024 sec: 0.113268 ( -0.113268 0.167993 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.05642e-08 ( -2.05642e-08 2.1449e-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: -1.22327 ( )
Epeak [keV] : 9999.18 ( -9999.17 0.824219 )
Norm@50keV : 6.665116E-04 ( -1.446687E-04 1.958131E-03) )
------------------------------------------------------------
Chi-Squared = 55.54975 using 59 PHA bins.
Reduced chi-squared = 0.9919598 for 56 degrees of freedom
Null hypothesis probability = 0.492
Photon flux (15-150 keV) in 1.024 sec: 0.108044 ( -0.108044 0.170026 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9956e-08 ( -1.9956e-08 2.18795e-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 : 0.817190 ( -10.8172 4.18281 )
beta : 1.75178 ( -2.47291 0.939955 )
Epeak [keV] : 14.7789 ( -14.6789 9985.22 )
Norm@50keV : 8.214513E-04 ( -8.214513E-04 34162.7 )
------------------------------------------------------------
Chi-Squared = 55.18159 using 59 PHA bins.
Reduced chi-squared = 1.003302 for 55 degrees of freedom
Null hypothesis probability = 0.468
Photon flux (15-150 keV) in 1.024 sec: 5.705718E-02 ( -0.0570572 0.185518 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37127e-08 ( -1.37127e-08 2.47026e-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: -0.922951 ( -2.07705 1.80712 )
Norm@50keV : 8.139887E-04 ( )
------------------------------------------------------------
Chi-Squared = 55.63042 using 59 PHA bins.
Reduced chi-squared = 0.9759723 for 57 degrees of freedom
Null hypothesis probability = 0.527
Photon flux (15-150 keV) in 1.024 sec: 0.113268 ( -0.113268 0.167993 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.05642e-08 ( -2.05642e-08 2.1449e-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: -1.22327 ( )
Epeak [keV] : 9999.18 ( -9999.17 0.824219 )
Norm@50keV : 6.665116E-04 ( -1.446687E-04 1.958131E-03) )
------------------------------------------------------------
Chi-Squared = 55.54975 using 59 PHA bins.
Reduced chi-squared = 0.9919598 for 56 degrees of freedom
Null hypothesis probability = 0.492
Photon flux (15-150 keV) in 1.024 sec: 0.108044 ( -0.108044 0.170026 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9956e-08 ( -1.9956e-08 2.18795e-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 : 0.817190 ( -10.8172 4.18281 )
beta : 1.75178 ( -2.47291 0.939955 )
Epeak [keV] : 14.7789 ( -14.6789 9985.22 )
Norm@50keV : 8.214513E-04 ( -8.214513E-04 34162.7 )
------------------------------------------------------------
Chi-Squared = 55.18159 using 59 PHA bins.
Reduced chi-squared = 1.003302 for 55 degrees of freedom
Null hypothesis probability = 0.468
Photon flux (15-150 keV) in 1.024 sec: 5.705718E-02 ( -0.0570572 0.185518 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37127e-08 ( -1.37127e-08 2.47026e-08 ) ergs/cm2
Plot creation:
Sat May 2 04:46:17 EDT 2009