batgrbproduct Analysis for Trigger=210084
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 v2.41
Process Start Time (local time): Tue Jan 1 12:27:18 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger210084/SDC
======================================================================
Trigger: 00210084 Segment: 000
BAT Trigger Time: 169352874.112 [s; MET]
Trigger Stop: 169352882.304 [s; MET]
UTC: 2006-05-15T02:27:52.918180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 127.287530616633 Dec: 73.550864318477 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.76
Image Trigger?: NO
Rate S/N Ratio: 16.6132477258361 [ if not an image trigger ]
Image S/N Ratio: 7.76
Flight Position: [ source = BAT ]
RA: 127.287530616633 Dec: 73.550864318477 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 127.273346729493 Dec: 73.5502180360665 [deg; J2000]
{ 08h 29m 05.6s , +73d 33' 00.8" }
+/- 1.85335365567853 [arcmin] (estimated 90% radius based on SNR)
+/- 0.833907379192378 [arcmin] (formal 1-sigma fit error)
SNR: 12.5985571384187
RA = 8h 29m 5.6s (127.273347 deg.)
Dec = 73d 33' 1" (73.550218 deg.)
Angular difference between Flight and Ground position is 0.244086 arcmin
Partial Coding Fraction: 0.3828125 [ including projection effects ]
Duration
T90: 336 +/- 475.17575695736
Measured from: 0.888000011444092
to: 336.888000011444 [s; relative to TRIGTIME]
T50: 336 +/- 254.621287405433
Measured from: 0.888000011444092
to: 336.888000011444 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 344.388000011444
to: 345.388000011444 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.888000011444092
to: 336.888000011444 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.358623 1.083519 1.421860 2.029303
0.386243 0.420169 0.408208 0.462591 [error]
Peak -0.221750 0.543297 0.129545 0.873704
0.142295 0.171287 0.184773 0.237535 [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 9.08e-08 3.39e-07 1.05e-06 1.06e-05 2.95e-06 1.23e-05 erg/cm2
Error 9.73e-08 1.96e-07 3.73e-07 8.53e-06 1.04e-06 8.54e-06 erg/cm2
Peak flux Power-law 4.40e-02 7.86e-02 1.09e-01 3.11e-01 3.13e-01 5.47e-01 ph/cm2/s
Error 7.11e-02 8.48e-02 8.77e-02 1.07e+00 1.11e+00 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 3.46e-08 3.52e-07 1.45e-06 1.54e-06 2.86e-06 3.46e-06 erg/cm2
Error 5.06e-08 2.12e-07 4.82e-07 4.02e-06 1.05e-06 3.76e-06 erg/cm2
Peak flux Cutoff-PL 5.48e-02 1.58e-01 1.08e-01 9.24e-03 3.28e-01 3.24e-01 ph/cm2/s
Error 6.55e-02 1.38e-01 1.06e-01 5.10e-01 2.28e-01 2.30e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 3.67e-02 1.37e-01 1.30e-01 1.17e-01 3.56e-01 4.62e-01 ph/cm2/s
Error 1.37e-01 9.84e-02 3.19e-01 2.40e-01 8.94e-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 0.360 0.664 - - 6.07e-04 4.42e-04 49.036 57
CPL -2.500 0.000 102.0 42.0 7.58e-03 1.83e-02 45.422 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.545 0.000 - - 2.67e-03 2.47e-03 53.066 57
CPL -2.500 0.000 61.2 130.4 1.99e-01 0.00e+00 51.636 0
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: 26.496000 sec.
T50 in the 50-300 keV band: 15.616000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 336.000 0.888 336.888
T90 336.000 0.888 336.888
T50 336.000 0.888 336.888
Peak 1.000 344.388 345.388
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
127.2733 +73.5502 0.0153 36.3 -125.6 2.5104 12.6 TRIG_00210084
------------------------------------------
Foreground time interval of the image:
0.888 131.493 (delta_t = 130.605 [sec])
Background time interval of the image:
-239.112 0.888 (delta_t = 240.000 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.888 sec. to 336.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.360463 ( -0.744262 0.583691 )
Norm@50keV : 6.071665E-04 ( -6.071664E-04 2.759155E-04) )
------------------------------------------------------------
Chi-Squared = 49.03605 using 59 PHA bins.
Reduced chi-squared = 0.8602816 for 57 degrees of freedom
Null hypothesis probability = 0.764
Photon flux (15-150 keV) in 336.0 sec: 7.388622E-02 ( -0.0278102 0.0290578 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.94996e-06 ( -1.03881e-06 1.04707e-06 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.888 sec. to 336.888 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49999 ( )
Epeak [keV] : 102.025 ( -25.8849 58.1388 )
Norm@50keV : 7.582567E-03 ( -1.073774E-02 2.580633E-02) )
------------------------------------------------------------
Chi-Squared = 45.42223 using 59 PHA bins.
but latest trial 155.759 gives Chi-Squared = 1.28281
Reduced chi-squared = 0.8111113 for 56 degrees of freedom
Null hypothesis probability = 0.843
Photon flux (15-150 keV) in 336.0 sec: 7.287187E-02 ( -0.023859 0.0253788 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.86072e-06 ( -1.01728e-06 1.07398e-06 ) ergs/cm2
Band function
Time interval is from 0.888 sec. to 336.888 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.25082 ( -2.40306 2.74918 )
beta : -9.30486 ( )
Epeak [keV] : 114.080 ( )
Norm@50keV : 4.859789E-03 ( )
------------------------------------------------------------
Chi-Squared = 45.63783 using 59 PHA bins.
Reduced chi-squared = 0.8297788 for 55 degrees of freedom
Null hypothesis probability = 0.812
Photon flux (15-150 keV) in 336.0 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 336.888 sec. to 352.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.544797 ( )
Norm@50keV : 2.674233E-03 ( -3.804206E-05 4.907810E-03) )
------------------------------------------------------------
Chi-Squared = 53.06619 using 59 PHA bins.
Reduced chi-squared = 0.9309858 for 57 degrees of freedom
Null hypothesis probability = 0.623
Photon flux (15-150 keV) in 16.00 sec: 0.312695 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.60746e-07 ( -4.58109e-07 4.76114e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 336.888 sec. to 352.888 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49990 ( )
Epeak [keV] : 61.2115 ( -54.3061 206.404 )
Norm@50keV : 0.198794 ( )
------------------------------------------------------------
Chi-Squared = 51.63602 using 59 PHA bins.
but latest trial 423.402 gives Chi-Squared = 3.38545
Reduced chi-squared = 0.9220719 for 56 degrees of freedom
Null hypothesis probability = 0.641
Photon flux (15-150 keV) in 16.00 sec: 0.327760 ( -0.227867 0.227954 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.93837e-07 ( -2.83859e-07 4.93726e-07 ) ergs/cm2
Band function
Time interval is from 336.888 sec. to 352.888 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.22286 ( -14.9974 2.649784E-03) )
beta : -2.73547 ( -7.09129 12.9087 )
Epeak [keV] : 51.8805 ( -51.2672 527.327 )
Norm@50keV : 2.20014 ( -5.29838 197220. )
------------------------------------------------------------
Chi-Squared = 50.94204 using 59 PHA bins.
Reduced chi-squared = 0.9262190 for 55 degrees of freedom
Null hypothesis probability = 0.630
Photon flux (15-150 keV) in 16.00 sec: 0.356251 ( -0.237522 0.242745 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.46213e-07 ( -3.94355e-07 3.70693e-07 ) ergs/cm2
Plot creation:
Tue Jan 1 12:51:33 EST 2008