batgrbproduct Analysis for Trigger=301578
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): Wed Jan 23 16:02:11 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger301578/GCN5_download_cron
======================================================================
Trigger: 00301578 Segment: 000
BAT Trigger Time: 222754919.924 [s; MET]
Trigger Stop: 222754919.988 [s; MET]
UTC: 2008-01-23T04:21:57.402220 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 338.928685995783 Dec: -64.8899237672072 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.04
Image Trigger?: NO
Rate S/N Ratio: 36.9864840178139 [ if not an image trigger ]
Image S/N Ratio: 7.04
Flight Position: [ source = BAT ]
RA: 338.928685995783 Dec: -64.8899237672072 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 338.974099638248 Dec: -64.9300635757195 [deg; J2000]
{ 22h 35m 53.8s , -64d 55' 48.2" }
+/- 4.13470367187643 [arcmin] (estimated 90% radius based on SNR)
+/- 2.77989215481414 [arcmin] (formal 1-sigma fit error)
SNR: 4.00390290702903
RA = 22h 35m 53.8s (338.974100 deg.)
Dec = -64d 55' 48" (-64.930064 deg.)
Angular difference between Flight and Ground position is 2.671211 arcmin
Partial Coding Fraction: 0.2050781 [ including projection effects ]
Duration
T90: 115.183999985456 +/- 55.8110297281302
Measured from: 0.0279999971389771
to: 115.211999982595 [s; relative to TRIGTIME]
T50: 24.5759999752045 +/- 57.1477943386167
Measured from: 8.66800001263618
to: 33.2439999878407 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0480000078678131
to: 0.951999992132187 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0119999945163727
to: 121.980000019073 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.402882 0.311929 0.252671 0.004122
0.092109 0.084868 0.073159 0.061725 [error]
Peak 0.001134 0.075267 0.069284 0.027896
0.014313 0.014009 0.013121 0.011170 [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 1.45e-07 1.79e-07 1.62e-07 2.54e-07 5.73e-07 7.43e-07 erg/cm2
Error 5.64e-08 4.74e-08 7.29e-08 2.36e-07 1.70e-07 3.15e-07 erg/cm2
Peak flux Power-law 4.63e-01 5.58e-01 4.87e-01 7.29e-01 1.76e+00 2.24e+00 ph/cm2/s
Error 2.20e-01 1.66e-01 1.13e-01 3.52e-01 4.45e-01 5.01e-01 ph/cm2/s
Fluence Cutoff-PL 1.42e-07 1.82e-07 1.63e-07 2.05e-07 5.69e-07 6.94e-07 erg/cm2
Error 6.25e-08 5.51e-08 7.40e-08 2.76e-07 1.74e-07 3.11e-07 erg/cm2
Peak flux Cutoff-PL 3.49e-01 5.77e-01 5.52e-01 3.72e-01 1.70e+00 1.85e+00 ph/cm2/s
Error 2.56e-01 1.88e-01 1.55e-01 4.91e-01 4.47e-01 6.46e-01 ph/cm2/s
Fluence Band 1.40e-07 1.82e-07 1.63e-07 2.03e-07 5.68e-07 6.80e-07 erg/cm2
Error 6.19e-08 5.49e-08 7.79e-08 2.75e-07 1.74e-07 3.43e-07 erg/cm2
Peak flux Band 3.49e-01 5.77e-01 5.52e-01 3.71e-01 1.70e+00 1.85e+00 ph/cm2/s
Error 2.57e-01 1.88e-01 1.55e-01 4.40e-01 4.48e-01 6.45e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.148 0.536 - - 5.03e-04 1.67e-04 63.011 57
CPL 1.636 0.000 35.3 0.0 9.02e-04 0.00e+00 63.126 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.196 0.385 - - 1.50e-02 3.51e-03 65.132 57
CPL 0.239 2.648 110.9 4966.4 3.84e-02 1.33e-01 63.991 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 121.968 0.012 121.980
T90 115.184 0.028 115.212
T50 24.576 8.668 33.244
Peak 1.000 -0.048 0.952
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
338.9741 -64.9301 0.0480 50.1 -26.2 0.2760 4.0 TRIG_00301578
------------------------------------------
Foreground time interval of the image:
0.256 7.621 (delta_t = 7.365 [sec])
Background time interval of the image:
-70.379 0.256 (delta_t = 70.635 [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 0.256 sec. to 122.224 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14783 ( -0.491902 0.580985 )
Norm@50keV : 5.029455E-04 ( -1.738386E-04 1.607580E-04) )
------------------------------------------------------------
Chi-Squared = 63.01125 using 59 PHA bins.
Reduced chi-squared = 1.105460 for 57 degrees of freedom
Null hypothesis probability = 0.272
Photon flux (15-150 keV) in 122.0 sec: 8.104690E-02 ( -0.0219413 0.0220651 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.73016e-07 ( -1.67706e-07 1.7197e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.256 sec. to 122.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63563 ( )
Epeak [keV] : 35.2840 ( )
Norm@50keV : 9.020004E-04 ( )
------------------------------------------------------------
Chi-Squared = 63.12610 using 59 PHA bins.
Reduced chi-squared = 1.127252 for 56 degrees of freedom
Null hypothesis probability = 0.239
Photon flux (15-150 keV) in 122.0 sec: 8.055201E-02 ( -0.0226386 0.022397 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.69029e-07 ( -1.73042e-07 1.7533e-07 ) ergs/cm2
Band function
Time interval is from 0.256 sec. to 122.224 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.99327 ( -7.79765 7.20235 )
beta : -8.23886 ( -0.581021 0.491849 )
Epeak [keV] : 6.91948 ( -6.81948 9993.08 )
Norm@50keV : 5.521485E-04 ( -2.363914E-02 2.185409E-02) )
------------------------------------------------------------
Chi-Squared = 63.11891 using 59 PHA bins.
Reduced chi-squared = 1.147617 for 55 degrees of freedom
Null hypothesis probability = 0.211
Photon flux (15-150 keV) in 122.0 sec: 8.055272E-02 ( -0.0226244 0.0223893 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.67958e-07 ( -1.73157e-07 1.75338e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.256 sec. to 1.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19627 ( -0.396427 0.373077 )
Norm@50keV : 1.503137E-02 ( -3.536913E-03 3.482699E-03) )
------------------------------------------------------------
Chi-Squared = 65.13215 using 59 PHA bins.
Reduced chi-squared = 1.142669 for 57 degrees of freedom
Null hypothesis probability = 0.215
Photon flux (15-150 keV) in 0.8800 sec: 1.76349 ( -0.43965 0.44936 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34275e-07 ( -3.047e-08 3.06627e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.256 sec. to 1.136 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.239413 ( -2.08983 3.20558 )
Epeak [keV] : 110.866 ( -43.7728 9889.13 )
Norm@50keV : 3.836149E-02 ( -3.836149E-02 0.227343 )
------------------------------------------------------------
Chi-Squared = 63.99105 using 59 PHA bins.
Reduced chi-squared = 1.142697 for 56 degrees of freedom
Null hypothesis probability = 0.216
Photon flux (15-150 keV) in 0.8800 sec: 1.69721 ( -0.43879 0.45601 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32055e-07 ( -3.1995e-08 3.14389e-08 ) ergs/cm2
Band function
Time interval is from 0.256 sec. to 1.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.236257 ( -1.24035 1.81631 )
beta : -8.94086 ( -8.55673 0.532781 )
Epeak [keV] : 110.642 ( -58.0348 784.080 )
Norm@50keV : 3.848838E-02 ( -35.1852 14.4143 )
------------------------------------------------------------
Chi-Squared = 63.99104 using 59 PHA bins.
Reduced chi-squared = 1.163473 for 55 degrees of freedom
Null hypothesis probability = 0.190
Photon flux (15-150 keV) in 0.8800 sec: 1.69671 ( -0.43752 0.45752 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32064e-07 ( -3.20258e-08 3.13993e-08 ) ergs/cm2
Plot creation:
Wed Jan 23 16:58:22 EST 2008