batgrbproduct Analysis for Trigger=293587
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): Fri Dec 14 18:34:48 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger293587/GCN5_download_cron
======================================================================
Trigger: 00293587 Segment: 000
BAT Trigger Time: 213573359.04 [s; MET]
Trigger Stop: 213573363.136 [s; MET]
UTC: 2007-10-08T21:55:56.761900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 151.547964114205 Dec: 44.3338686638463 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.42
Image Trigger?: NO
Rate S/N Ratio: 11.6619037896906 [ if not an image trigger ]
Image S/N Ratio: 9.42
Flight Position: [ source = BAT ]
RA: 151.547964114205 Dec: 44.3338686638463 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 151.598587777865 Dec: 44.2924154171642 [deg; J2000]
{ 10h 06m 23.7s , +44d 17' 32.7" }
+/- 1.89096488314389 [arcmin] (estimated 90% radius based on SNR)
+/- 0.729145243223503 [arcmin] (formal 1-sigma fit error)
SNR: 12.2421103245145
RA = 10h 6m 23.7s (151.598588 deg.)
Dec = 44d 17' 33" (44.292415 deg.)
Angular difference between Flight and Ground position is 3.302981 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 13.4400000274181 +/- 3.66368558305891
Measured from: -2.94400000572205
to: 10.4960000216961 [s; relative to TRIGTIME]
T50: 4.99200001358986 +/- 2.37835573703164
Measured from: -0.831999987363815
to: 4.16000002622604 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.172000020742416
to: 1.17200002074242 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.32799997925758
to: 13.5680000185966 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.198429 0.142022 0.077669 -0.000518
0.019433 0.019376 0.016644 0.014108 [error]
Peak 0.028331 0.023886 0.004937 0.003124
0.004743 0.004733 0.004036 0.003492 [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 5.41e-08 6.27e-08 5.22e-08 7.32e-08 1.95e-07 2.42e-07 erg/cm2
Error 9.34e-09 9.14e-09 1.48e-08 3.97e-08 3.38e-08 5.89e-08 erg/cm2
Peak flux Power-law 2.58e-01 1.65e-01 6.79e-02 3.80e-02 5.10e-01 5.29e-01 ph/cm2/s
Error 7.10e-02 3.99e-02 3.07e-02 3.16e-02 1.14e-01 1.21e-01 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Fluence Band 5.29e-08 6.51e-08 4.96e-08 3.52e-08 1.87e-07 2.03e-07 erg/cm2
Error 9.61e-09 1.16e-08 1.77e-08 5.78e-08 3.87e-08 7.49e-08 erg/cm2
Peak flux Band 2.45e-01 1.95e-01 5.15e-02 3.47e-03 4.95e-01 4.95e-01 ph/cm2/s
Error 5.84e-02 3.47e-02 1.90e-02 2.84e-02 1.09e-01 1.09e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.264 0.283 - - 1.22e-03 2.52e-04 71.341 57
CPL 1.700 0.000 20.0 0.0 2.71e-03 0.00e+00 71.099 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.278 0.455 - - 2.95e-03 1.02e-03 57.835 57
CPL 0.608 0.000 28.8 0.0 3.57e-02 0.00e+00 56.240 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 16.896 -3.328 13.568
T90 13.440 -2.944 10.496
T50 4.992 -0.832 4.160
Peak 1.000 0.172 1.172
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
151.5986 +44.2924 0.0157 12.5 82.7 0.4538 12.2 TRIG_00293587
------------------------------------------
Foreground time interval of the image:
-3.328 13.568 (delta_t = 16.896 [sec])
Background time interval of the image:
-140.039 -94.980 (delta_t = 45.059 [sec])
-94.040 -3.328 (delta_t = 90.712 [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 -3.328 sec. to 13.568 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.26375 ( -0.269827 0.296152 )
Norm@50keV : 1.217627E-03 ( -2.544015E-04 2.486145E-04) )
------------------------------------------------------------
Chi-Squared = 71.34112 using 59 PHA bins.
Reduced chi-squared = 1.251599 for 57 degrees of freedom
Null hypothesis probability = 9.579E-02
Photon flux (15-150 keV) in 16.90 sec: 0.208585 ( -0.027897 0.027898 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95401e-07 ( -3.31338e-08 3.45351e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.328 sec. to 13.568 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70030 ( )
Epeak [keV] : 20.0052 ( )
Norm@50keV : 2.706565E-03 ( )
------------------------------------------------------------
Chi-Squared = 71.09853 using 59 PHA bins.
Reduced chi-squared = 1.269617 for 56 degrees of freedom
Null hypothesis probability = 8.422E-02
Photon flux (15-150 keV) in 16.90 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -3.328 sec. to 13.568 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48842 ( -14.8916 0.108416 )
beta : -2.36975 ( -0.357035 0.332453 )
Epeak [keV] : 18.3799 ( -18.2325 101.838 )
Norm@50keV : 4.373761E-03 ( -817.471 2.198733E+06) )
------------------------------------------------------------
Chi-Squared = 70.63642 using 59 PHA bins.
Reduced chi-squared = 1.284299 for 55 degrees of freedom
Null hypothesis probability = 7.615E-02
Photon flux (15-150 keV) in 16.90 sec: 0.206444 ( -0.028373 0.028459 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87103e-07 ( -3.73754e-08 4.00699e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.192 sec. to 1.152 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.27767 ( -0.416096 0.494045 )
Norm@50keV : 2.953640E-03 ( -1.033585E-03 1.016294E-03) )
------------------------------------------------------------
Chi-Squared = 57.83458 using 59 PHA bins.
Reduced chi-squared = 1.014642 for 57 degrees of freedom
Null hypothesis probability = 0.444
Photon flux (15-150 keV) in 0.9600 sec: 0.509818 ( -0.114231 0.114344 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.69797e-08 ( -7.60829e-09 8.19514e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.192 sec. to 1.152 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.607611 ( )
Epeak [keV] : 28.8093 ( )
Norm@50keV : 3.566092E-02 ( )
------------------------------------------------------------
Chi-Squared = 56.24021 using 59 PHA bins.
Reduced chi-squared = 1.004289 for 56 degrees of freedom
Null hypothesis probability = 0.466
Photon flux (15-150 keV) in 0.9600 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.192 sec. to 1.152 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.00423 ( -8.99577 5.42729 )
beta : -9.26885 ( -0.731153 7.27002 )
Epeak [keV] : 28.0675 ( -10.8743 68.1900 )
Norm@50keV : 1.911449E-02 ( -5.095905E-03 14.6101 )
------------------------------------------------------------
Chi-Squared = 56.31201 using 59 PHA bins.
Reduced chi-squared = 1.023855 for 55 degrees of freedom
Null hypothesis probability = 0.426
Photon flux (15-150 keV) in 0.9600 sec: 0.494665 ( -0.108596 0.108596 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35176e-08 ( -6.81744e-09 9.75379e-09 ) ergs/cm2
Plot creation:
Fri Dec 14 19:00:25 EST 2007