batgrbproduct Analysis for Trigger=351837
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 20:13:20 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger351837/GCN5_download_cron
======================================================================
Trigger: 00351837 Segment: 000
BAT Trigger Time: 263873740.096 [s; MET]
Trigger Stop: 263873744.192 [s; MET]
UTC: 2009-05-13T02:15:35.359420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 321.448148886631 Dec: -51.5474185016667 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.85
Image Trigger?: NO
Rate S/N Ratio: 24.6373699895098 [ if not an image trigger ]
Image S/N Ratio: 5.85
Flight Position: [ source = BAT ]
RA: 321.448148886631 Dec: -51.5474185016667 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 321.437965089146 Dec: -51.5297472190422 [deg; J2000]
{ 21h 25m 45.1s , -51d 31' 47.1" }
+/- 4.65344415562178 [arcmin] (estimated 90% radius based on SNR)
+/- 3.42524617196617 [arcmin] (formal 1-sigma fit error)
SNR: 3.38185357048343
Angular difference between Flight and Ground position is 1.126333 arcmin
Partial Coding Fraction: 0.2089844 [ 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 0.161164 0.020537 -0.013671 -0.016573
0.028130 0.027943 0.023763 0.020633 [error]
Peak 0.161164 0.020537 -0.013671 -0.016573
0.028130 0.027943 0.023763 0.020633 [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 5.40e-08 2.58e-08 7.48e-09 2.73e-09 8.89e-08 8.98e-08 erg/cm2
Error 1.84e-08 1.45e-08 9.84e-09 7.00e-09 3.59e-08 3.71e-08 erg/cm2
Peak flux Power-law 4.44e-01 1.19e-01 1.80e-02 2.92e-03 5.87e-01 5.85e-01 ph/cm2/s
Error 1.53e-01 6.55e-02 2.25e-02 7.00e-03 2.03e-01 2.04e-01 ph/cm2/s
Fluence Cutoff-PL 6.55e-08 2.07e-08 1.52e-10 1.08e-15 8.62e-08 8.59e-08 erg/cm2
Error 2.02e-08 1.76e-08 8.41e-10 1.80e-12 2.72e-08 2.73e-08 erg/cm2
Peak flux Cutoff-PL 4.47e-01 1.21e-01 1.75e-02 2.87e-03 5.87e-01 5.86e-01 ph/cm2/s
Error 1.55e-01 6.55e-02 2.25e-02 6.94e-03 2.02e-01 2.03e-01 ph/cm2/s
Fluence Band 6.51e-08 2.00e-08 2.03e-10 1.23e-12 8.72e-08 1.05e-07 erg/cm2
Error 2.02e-08 1.14e-08 2.05e-09 5.10e-10 2.65e-08 0.00e+00 erg/cm2
Peak flux Band 4.66e-01 1.34e-01 8.57e-03 1.86e-04 6.08e-01 6.08e-01 ph/cm2/s
Error 1.57e-01 6.79e-02 1.75e-02 3.28e-03 1.98e-01 1.99e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.691 0.978 - - 1.25e-03 1.21e-03 59.899 57
CPL -2.500 0.000 16.1 10.1 1.30e+02 5.44e+02 53.810 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.691 0.978 - - 1.25e-03 1.21e-03 59.899 57
CPL -2.500 0.000 16.1 10.1 1.30e+02 5.44e+02 53.810 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
321.4380 -51.5297 0.0563 53.1 -173.4 0.1841 3.4 TRIG_00351837
------------------------------------------
Foreground time interval of the image:
0.000 4.096 (delta_t = 4.096 [sec])
Background time interval of the image:
-60.096 -20.096 (delta_t = 40.000 [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: 3.69082 ( -0.755208 1.19982 )
Norm@50keV : 1.248915E-03 ( -1.248915E-03 1.173533E-03) )
------------------------------------------------------------
Chi-Squared = 59.89925 using 59 PHA bins.
Reduced chi-squared = 1.050864 for 57 degrees of freedom
Null hypothesis probability = 0.371
Photon flux (15-150 keV) in 4.096 sec: 0.587112 ( -0.201638 0.203395 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.88619e-08 ( -3.34664e-08 3.82489e-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: -2.49996 ( )
Epeak [keV] : 16.1223 ( -16.3972 3.70707 )
Norm@50keV : 129.865 ( -238.430 848.820 )
------------------------------------------------------------
Chi-Squared = 53.80977 using 59 PHA bins.
Reduced chi-squared = 0.9608888 for 56 degrees of freedom
Null hypothesis probability = 0.558
Photon flux (15-150 keV) in 4.096 sec: 0.586990 ( -0.201703 0.203234 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.61999e-08 ( -2.65904e-08 2.78e-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 : -1.54484 ( -0.956528 1.97360 )
beta : -8.64318 ( -1.06107 18.9385 )
Epeak [keV] : 8.16232 ( -7.39272 3.39783 )
Norm@50keV : 2.694720E-02 ( -3149.10 14653.9 )
------------------------------------------------------------
Chi-Squared = 60.13164 using 59 PHA bins.
Reduced chi-squared = 1.093303 for 55 degrees of freedom
Null hypothesis probability = 0.295
Photon flux (15-150 keV) in 4.096 sec: 0.607976 ( -0.198823 0.197889 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.71813e-08 ( -2.57991e-08 2.7129e-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: 3.69082 ( -0.755208 1.19982 )
Norm@50keV : 1.248915E-03 ( -1.248915E-03 1.173533E-03) )
------------------------------------------------------------
Chi-Squared = 59.89925 using 59 PHA bins.
Reduced chi-squared = 1.050864 for 57 degrees of freedom
Null hypothesis probability = 0.371
Photon flux (15-150 keV) in 4.096 sec: 0.587112 ( -0.201638 0.203395 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.88619e-08 ( -3.34664e-08 3.82489e-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: -2.49996 ( )
Epeak [keV] : 16.1223 ( -16.3972 3.70707 )
Norm@50keV : 129.865 ( -238.430 848.820 )
------------------------------------------------------------
Chi-Squared = 53.80977 using 59 PHA bins.
Reduced chi-squared = 0.9608888 for 56 degrees of freedom
Null hypothesis probability = 0.558
Photon flux (15-150 keV) in 4.096 sec: 0.586990 ( -0.201703 0.203234 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.61999e-08 ( -2.65904e-08 2.78e-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 : -1.54484 ( -0.956528 1.97360 )
beta : -8.64318 ( -1.06107 18.9385 )
Epeak [keV] : 8.16232 ( -14.6737 3.39783 )
Norm@50keV : 2.694720E-02 ( -3149.10 14653.9 )
------------------------------------------------------------
Chi-Squared = 60.13164 using 59 PHA bins.
Reduced chi-squared = 1.093303 for 55 degrees of freedom
Null hypothesis probability = 0.295
Photon flux (15-150 keV) in 4.096 sec: 0.607976 ( -0.198823 0.197889 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.71813e-08 ( -2.57991e-08 2.7129e-08 ) ergs/cm2
Plot creation:
Wed May 13 20:34:20 EDT 2009