batgrbproduct Analysis for Trigger=176453
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): Sat Dec 29 18:26:45 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger176453/SDC
======================================================================
Trigger: 00176453 Segment: 000
BAT Trigger Time: 158423952.704 [s; MET]
Trigger Stop: 158423953.728 [s; MET]
UTC: 2006-01-08T14:39:11.760360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 146.991545670284 Dec: 31.9164170544607 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.51
Image Trigger?: NO
Rate S/N Ratio: 13.7477270848675 [ if not an image trigger ]
Image S/N Ratio: 8.51
Flight Position: [ source = BAT ]
RA: 146.991545670284 Dec: 31.9164170544607 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 147.018175843134 Dec: 31.9319540387156 [deg; J2000]
{ 09h 48m 04.4s , +31d 55' 55.0" }
+/- 1.33785264433836 [arcmin] (estimated 90% radius based on SNR)
+/- 0.582919372685637 [arcmin] (formal 1-sigma fit error)
SNR: 20.0694338250212
RA = 9h 48m 4.4s (147.018176 deg.)
Dec = 31d 55' 55" (31.931954 deg.)
Angular difference between Flight and Ground position is 1.645645 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 14.2680000066757 +/- 2.08302088658982
Measured from: -2.58399999141693
to: 11.6840000152588 [s; relative to TRIGTIME]
T50: 4.39600002765656 +/- 0.853362769600671
Measured from: 0.775999993085861
to: 5.17200002074242 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.604000002145767
to: 1.60400000214577 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.02399998903275
to: 13.2280000150204 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.300780 0.244949 0.143782 0.022726
0.019060 0.019488 0.016669 0.013675 [error]
Peak 0.027851 0.040607 0.018941 0.011258
0.004842 0.005076 0.004250 0.003329 [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 8.39e-08 1.12e-07 1.10e-07 1.93e-07 3.69e-07 4.98e-07 erg/cm2
Error 1.08e-08 9.39e-09 1.66e-08 5.96e-08 3.69e-08 7.60e-08 erg/cm2
Peak flux Power-law 2.88e-01 2.57e-01 1.58e-01 1.47e-01 7.65e-01 8.49e-01 ph/cm2/s
Error 6.72e-02 3.98e-02 3.49e-02 6.34e-02 1.18e-01 1.33e-01 ph/cm2/s
Fluence Cutoff-PL 8.42e-08 1.12e-07 1.10e-07 1.92e-07 3.69e-07 4.72e-07 erg/cm2
Error 1.09e-08 9.40e-09 1.67e-08 5.91e-08 3.70e-08 1.07e-07 erg/cm2
Peak flux Cutoff-PL 2.60e-01 2.88e-01 1.61e-01 4.89e-02 7.45e-01 7.58e-01 ph/cm2/s
Error 7.98e-02 6.03e-02 4.21e-02 9.66e-02 1.23e-01 1.58e-01 ph/cm2/s
Fluence Band 8.43e-08 1.11e-07 1.07e-07 1.84e-07 3.65e-07 4.88e-07 erg/cm2
Error 6.22e-09 9.32e-09 8.99e-09 3.91e-08 3.21e-08 4.09e-08 erg/cm2
Peak flux Band 2.53e-01 2.96e-01 1.55e-01 8.05e-02 7.45e-01 7.84e-01 ph/cm2/s
Error 8.30e-02 7.42e-02 3.58e-02 7.69e-02 1.21e-01 1.43e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.028 0.175 - - 2.31e-03 2.48e-04 51.522 57
CPL 2.031 0.533 196.0 5000.0 2.30e-03 3.63e-04 51.515 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.704 0.267 - - 5.75e-03 9.88e-04 52.798 57
CPL 0.758 1.582 57.7 4979.4 1.95e-02 1.15e-01 51.373 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: 6.528000 sec.
T50 in the 50-300 keV band: 2.880000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 17.252 -4.024 13.228
T90 14.268 -2.584 11.684
T50 4.396 0.776 5.172
Peak 1.000 0.604 1.604
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
147.0182 +31.9320 0.0095 16.4 -14.4 0.7716 20.1 TRIG_00176453
------------------------------------------
Foreground time interval of the image:
-4.024 13.228 (delta_t = 17.252 [sec])
Background time interval of the image:
-299.704 -4.024 (delta_t = 295.680 [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 -4.024 sec. to 13.228 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02756 ( -0.170902 0.178422 )
Norm@50keV : 2.313630E-03 ( -2.506603E-04 2.444261E-04) )
------------------------------------------------------------
Chi-Squared = 51.52240 using 59 PHA bins.
Reduced chi-squared = 0.9039018 for 57 degrees of freedom
Null hypothesis probability = 0.680
Photon flux (15-150 keV) in 17.25 sec: 0.351516 ( -0.029898 0.029942 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.68688e-07 ( -3.6677e-08 3.72203e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.024 sec. to 13.228 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03129 ( -0.574382 0.491244 )
Epeak [keV] : 196.021 ( -196.010 9803.98 )
Norm@50keV : 2.297231E-03 ( -4.640729E-04 2.613561E-04) )
------------------------------------------------------------
Chi-Squared = 51.51528 using 59 PHA bins.
but latest trial 1.835898E-03 gives Chi-Squared = 0.299370
Reduced chi-squared = 0.9199157 for 56 degrees of freedom
Null hypothesis probability = 0.645
Photon flux (15-150 keV) in 17.25 sec: 0.351374 ( -0.029887 0.029929 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.68622e-07 ( -3.66338e-08 3.72738e-08 ) ergs/cm2
Band function
Time interval is from -4.024 sec. to 13.228 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.70199 ( -8.29801 6.70199 )
beta : -2.02437 ( -0.182246 0.167792 )
Epeak [keV] : 8.80960 ( -8.70960 408.772 )
Norm@50keV : 5.456339E-03 ( -5.456339E-03 2807.73 )
------------------------------------------------------------
Chi-Squared = 51.52331 using 59 PHA bins.
Reduced chi-squared = 0.9367875 for 55 degrees of freedom
Null hypothesis probability = 0.608
Photon flux (15-150 keV) in 17.25 sec: 0.351376 ( -0.029893 0.029928 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.65019e-07 ( -3.05653e-08 3.36444e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.604 sec. to 1.604 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70391 ( -0.260386 0.272975 )
Norm@50keV : 5.750074E-03 ( -9.999690E-04 9.761532E-04) )
------------------------------------------------------------
Chi-Squared = 52.79809 using 59 PHA bins.
Reduced chi-squared = 0.9262822 for 57 degrees of freedom
Null hypothesis probability = 0.633
Photon flux (15-150 keV) in 1.000 sec: 0.764721 ( -0.117799 0.117844 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.32364e-08 ( -9.5623e-09 9.7275e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.604 sec. to 1.604 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.757676 ( -1.89205 1.27158 )
Epeak [keV] : 57.7332 ( -16.5323 9942.27 )
Norm@50keV : 1.952187E-02 ( -1.952187E-02 0.211009 )
------------------------------------------------------------
Chi-Squared = 51.37302 using 59 PHA bins.
Reduced chi-squared = 0.9173754 for 56 degrees of freedom
Null hypothesis probability = 0.650
Photon flux (15-150 keV) in 1.000 sec: 0.744859 ( -0.123097 0.121916 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.89842e-08 ( -1.07748e-08 1.14754e-08 ) ergs/cm2
Band function
Time interval is from 0.604 sec. to 1.604 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.465492 ( -9.53451 4.10941 )
beta : -2.36005 ( -7.63995 0.781024 )
Epeak [keV] : 51.4570 ( -51.3570 21.4626 )
Norm@50keV : 2.989045E-02 ( -2.989045E-02 58.8938 )
------------------------------------------------------------
Chi-Squared = 50.73461 using 59 PHA bins.
Reduced chi-squared = 0.9224474 for 55 degrees of freedom
Null hypothesis probability = 0.638
Photon flux (15-150 keV) in 1.000 sec: 0.745079 ( -0.12079 0.120537 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.97595e-08 ( -1.00879e-08 1.01933e-08 ) ergs/cm2
Plot creation:
Sat Dec 29 18:41:14 EST 2007