batgrbproduct Analysis for Trigger=213934
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 16:33:18 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger213934/GCN5_download_cron
======================================================================
Trigger: 00213934 Segment: 000
BAT Trigger Time: 171415965.376 [s; MET]
Trigger Stop: 171415966.4 [s; MET]
UTC: 2006-06-07T23:32:44.133940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 42.0330569109095 Dec: 14.73591271934 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.37
Image Trigger?: NO
Rate S/N Ratio: 12.8840987267251 [ if not an image trigger ]
Image S/N Ratio: 7.37
Flight Position: [ source = BAT ]
RA: 42.0330569109095 Dec: 14.73591271934 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 42.0411532219211 Dec: 14.7516618115574 [deg; J2000]
{ 02h 48m 09.9s , +14d 45' 06.0" }
+/- 1.16800433564043 [arcmin] (estimated 90% radius based on SNR)
+/- 0.490462058432822 [arcmin] (formal 1-sigma fit error)
SNR: 24.3651538900014
RA = 2h 48m 9.9s (42.041153 deg.)
Dec = 14d 45' 6" (14.751662 deg.)
Angular difference between Flight and Ground position is 1.055281 arcmin
Partial Coding Fraction: 0.3515625 [ including projection effects ]
Duration
T90: 27.5920000076294 +/- 4.39241391705514
Measured from: 0.572000026702881
to: 28.1640000343323 [s; relative to TRIGTIME]
T50: 12.891999989748 +/- 2.6648317008209
Measured from: 5.52400001883507
to: 18.4160000085831 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.64000001549721
to: 9.64000001549721 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.755999982357025
to: 37.0960000157356 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.727302 0.913361 0.708851 0.153702
0.052552 0.054023 0.048881 0.042681 [error]
Peak 0.043160 0.048655 0.064797 0.008939
0.008948 0.009534 0.008837 0.007060 [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 2.58e-07 4.34e-07 5.55e-07 1.42e-06 1.64e-06 2.67e-06 erg/cm2
Error 2.98e-08 2.99e-08 4.89e-08 2.72e-07 1.17e-07 3.09e-07 erg/cm2
Peak flux Power-law 4.58e-01 4.80e-01 3.55e-01 4.24e-01 1.46e+00 1.72e+00 ph/cm2/s
Error 1.33e-01 8.80e-02 6.97e-02 1.68e-01 2.50e-01 2.86e-01 ph/cm2/s
Fluence Cutoff-PL 2.52e-07 4.39e-07 5.59e-07 1.21e-06 1.63e-06 2.36e-06 erg/cm2
Error 3.43e-08 2.80e-08 3.92e-08 5.73e-07 8.83e-08 5.56e-07 erg/cm2
Peak flux Cutoff-PL 3.43e-01 5.14e-01 4.09e-01 1.85e-01 1.39e+00 1.45e+00 ph/cm2/s
Error 1.75e-01 1.04e-01 9.44e-02 1.89e-01 1.97e-01 3.27e-01 ph/cm2/s
Fluence Band 2.44e-07 4.44e-07 5.50e-07 1.35e-06 1.62e-06 2.59e-06 erg/cm2
Error 3.53e-08 3.88e-08 4.80e-08 3.03e-07 1.21e-07 4.60e-07 erg/cm2
Peak flux Band 3.42e-01 5.13e-01 4.09e-01 1.85e-01 1.39e+00 1.45e+00 ph/cm2/s
Error 1.72e-01 1.04e-01 9.41e-02 1.83e-01 2.63e-01 3.26e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.645 0.119 - - 4.66e-03 3.13e-04 65.488 57
CPL 1.537 0.342 217.3 5000.0 5.28e-03 2.26e-03 65.303 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.434 0.274 - - 1.19e-02 1.97e-03 73.357 57
CPL 0.265 1.465 83.6 3288.1 4.04e-02 9.97e-02 70.615 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: 26.816000 sec.
T50 in the 50-300 keV band: 10.624000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 37.852 -0.756 37.096
T90 27.592 0.572 28.164
T50 12.892 5.524 18.416
Peak 1.000 8.640 9.640
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
42.0412 +14.7517 0.0079 40.8 -42.3 2.6891 24.4 TRIG_00213934
------------------------------------------
Foreground time interval of the image:
-0.756 37.096 (delta_t = 37.852 [sec])
Background time interval of the image:
-239.376 -0.756 (delta_t = 238.620 [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 -0.756 sec. to 37.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64467 ( -0.118917 0.119959 )
Norm@50keV : 4.656252E-03 ( -3.136289E-04 3.117379E-04) )
------------------------------------------------------------
Chi-Squared = 65.48751 using 59 PHA bins.
Reduced chi-squared = 1.148904 for 57 degrees of freedom
Null hypothesis probability = 0.206
Photon flux (15-150 keV) in 37.85 sec: 0.606934 ( -0.041688 0.041792 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63983e-06 ( -1.16271e-07 1.17047e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.756 sec. to 37.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53697 ( -0.460828 0.222383 )
Epeak [keV] : 217.310 ( -217.300 9782.69 )
Norm@50keV : 5.276396E-03 ( -9.143096E-04 3.604312E-03) )
------------------------------------------------------------
Chi-Squared = 65.30347 using 59 PHA bins.
Reduced chi-squared = 1.166133 for 56 degrees of freedom
Null hypothesis probability = 0.185
Photon flux (15-150 keV) in 37.85 sec: 0.603825 ( -0.041414 0.041109 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62935e-06 ( -6.31944e-08 1.13402e-07 ) ergs/cm2
Band function
Time interval is from -0.756 sec. to 37.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.878558 ( -11.8970 2.87349 )
beta : -1.69991 ( -0.144014 0.139112 )
Epeak [keV] : 45.1262 ( -27.2779 9972.62 )
Norm@50keV : 1.506308E-02 ( -1.83328 333.247 )
------------------------------------------------------------
Chi-Squared = 64.56948 using 59 PHA bins.
Reduced chi-squared = 1.173991 for 55 degrees of freedom
Null hypothesis probability = 0.177
Photon flux (15-150 keV) in 37.85 sec: 0.600741 ( -0.045286 0.042018 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62302e-06 ( -1.22237e-07 1.19542e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 8.640 sec. to 9.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43436 ( -0.272054 0.275700 )
Norm@50keV : 1.186521E-02 ( -1.967233E-03 1.963611E-03) )
------------------------------------------------------------
Chi-Squared = 73.35698 using 59 PHA bins.
Reduced chi-squared = 1.286965 for 57 degrees of freedom
Null hypothesis probability = 7.118E-02
Photon flux (15-150 keV) in 1.000 sec: 1.45663 ( -0.24902 0.25003 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13866e-07 ( -2.0228e-08 2.0415e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.640 sec. to 9.640 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.265051 ( -1.73128 1.19818 )
Epeak [keV] : 83.6137 ( -22.0839 6554.19 )
Norm@50keV : 4.040958E-02 ( -2.849769E-02 0.170809 )
------------------------------------------------------------
Chi-Squared = 70.61534 using 59 PHA bins.
but latest trial 1.191189E-02 gives Chi-Squared = 2.66624
Reduced chi-squared = 1.260988 for 56 degrees of freedom
Null hypothesis probability = 9.042E-02
Photon flux (15-150 keV) in 1.000 sec: 1.39051 ( -0.13312 0.2618 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10504e-07 ( -2.07144e-08 2.107e-08 ) ergs/cm2
Band function
Time interval is from 8.640 sec. to 9.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.272844 ( -1.19050 0.899615 )
beta : -9.12537 ( -0.874634 19.1253 )
Epeak [keV] : 83.7214 ( -22.1840 6454.96 )
Norm@50keV : 4.012914E-02 ( -4.012914E-02 0.171343 )
------------------------------------------------------------
Chi-Squared = 70.61575 using 59 PHA bins.
Reduced chi-squared = 1.283923 for 55 degrees of freedom
Null hypothesis probability = 7.639E-02
Photon flux (15-150 keV) in 1.000 sec: 1.39072 ( -0.26507 0.26168 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10641e-07 ( -2.0854e-08 2.0864e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 16:49:50 EST 2008