batgrbproduct Analysis for Trigger=316063
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): Sun Jul 6 02:29:44 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger316063/GCN5_download_cron
======================================================================
Trigger: 00316063 Segment: 000
BAT Trigger Time: 236985256 [s; MET]
Trigger Stop: 236985320 [s; MET]
UTC: 2008-07-05T21:14:13.081460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 130.245732251692 Dec: -45.0982244424741 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.38
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.38
Flight Position: [ source = BAT ]
RA: 130.245732251692 Dec: -45.0982244424741 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 130.225048436572 Dec: -45.0536272354055 [deg; J2000]
{ 08h 40m 54.0s , -45d 03' 13.1" }
+/- 4.40966712812757 [arcmin] (estimated 90% radius based on SNR)
+/- 3.6429403187616 [arcmin] (formal 1-sigma fit error)
SNR: 3.65206631914481
Angular difference between Flight and Ground position is 2.815691 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 256 +/- 80
Measured from: -31
to: 225 [s; relative to TRIGTIME]
T50: 144 +/- 71.5541752799933
Measured from: 33
to: 177 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 88.5
to: 89.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: -31
to: 257 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.835488 0.840214 0.119619 0.001047
0.088834 0.087956 0.077708 0.069869 [error]
Peak 0.053907 0.069850 0.024677 0.020596
0.021075 0.020906 0.018094 0.016262 [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 2.93e-07 2.91e-07 2.03e-07 2.23e-07 8.76e-07 1.01e-06 erg/cm2
Error 4.41e-08 4.44e-08 6.05e-08 1.22e-07 1.46e-07 2.17e-07 erg/cm2
Peak flux Power-law 3.56e-02 2.70e-02 1.36e-02 9.86e-03 8.08e-02 8.61e-02 ph/cm2/s
Error 1.84e-02 1.07e-02 8.88e-03 1.39e-02 3.16e-02 3.45e-02 ph/cm2/s
Fluence Cutoff-PL 2.82e-07 3.56e-07 7.28e-08 9.20e-10 7.12e-07 7.12e-07 erg/cm2
Error 4.92e-08 6.17e-08 6.77e-08 1.03e-08 1.19e-07 1.19e-07 erg/cm2
Peak flux Cutoff-PL 3.23e-02 3.67e-02 4.81e-03 1.98e-05 7.36e-02 7.36e-02 ph/cm2/s
Error 1.76e-02 1.51e-02 1.06e-02 1.10e-02 2.98e-02 3.02e-02 ph/cm2/s
Fluence Band 2.88e-07 3.37e-07 1.22e-07 1.40e-08 7.60e-07 7.42e-07 erg/cm2
Error 4.92e-08 5.02e-08 5.48e-08 6.74e-08 1.30e-07 1.73e-07 erg/cm2
Peak flux Band 3.27e-02 3.30e-02 1.13e-02 4.19e-03 7.99e-02 8.22e-02 ph/cm2/s
Error 1.49e-02 1.37e-02 1.09e-02 9.35e-03 3.08e-02 3.46e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.523 0.275 - - 3.02e-04 6.71e-05 63.835 57
CPL -0.445 2.108 25.6 4.7 3.16e-02 4.93e-01 54.042 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.985 0.761 - - 5.42e-04 4.06e-04 47.276 57
CPL -1.785 0.000 32.6 10.0 1.72e-01 2.01e+00 46.204 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 288.000 -31.000 257.000
T90 256.000 -31.000 225.000
T50 144.000 33.000 177.000
Peak 1.000 88.500 89.500
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
130.2250 -45.0536 0.0523 24.2 -44.4 0.4497 3.7 TRIG_00316063
------------------------------------------
Foreground time interval of the image:
-31.000 70.401 (delta_t = 101.401 [sec])
Background time interval of the image:
-239.000 -199.500 (delta_t = 39.500 [sec])
-198.000 -31.000 (delta_t = 167.000 [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 -31.000 sec. to 257.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.52312 ( -0.260929 0.288916 )
Norm@50keV : 3.023042E-04 ( -6.668725E-05 6.746943E-05) )
------------------------------------------------------------
Chi-Squared = 63.83548 using 59 PHA bins.
Reduced chi-squared = 1.119921 for 57 degrees of freedom
Null hypothesis probability = 0.249
Photon flux (15-150 keV) in 288.0 sec: 6.023403E-02 ( -0.00774651 0.00775254 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.75981e-07 ( -1.42059e-07 1.49622e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -31.000 sec. to 257.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.445013 ( -2.55499 1.66096 )
Epeak [keV] : 25.6197 ( -4.95613 4.38154 )
Norm@50keV : 3.157037E-02 ( -3.157036E-02 0.954092 )
------------------------------------------------------------
Chi-Squared = 54.04247 using 59 PHA bins.
but latest trial 20.6636 gives Chi-Squared = 5.27692
Reduced chi-squared = 0.9650441 for 56 degrees of freedom
Null hypothesis probability = 0.549
Photon flux (15-150 keV) in 288.0 sec: 5.715708E-02 ( -0.00753798 0.00758972 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.11858e-07 ( -1.09823e-07 1.27282e-07 ) ergs/cm2
Band function
Time interval is from -31.000 sec. to 257.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.45175 ( -0.862794 1.04207 )
beta : -6.33626 ( -3.66374 16.3354 )
Epeak [keV] : 18.0184 ( -6.28071 40.1902 )
Norm@50keV : 1.482345E-03 ( -0.140238 30.5587 )
------------------------------------------------------------
Chi-Squared = 57.91624 using 59 PHA bins.
Reduced chi-squared = 1.053023 for 55 degrees of freedom
Null hypothesis probability = 0.368
Photon flux (15-150 keV) in 288.0 sec: 5.796069E-02 ( -0.00721914 0.00812469 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.60352e-07 ( -1.02995e-07 1.56102e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 81.000 sec. to 97.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98523 ( -0.688270 0.834185 )
Norm@50keV : 5.421281E-04 ( -5.421281E-04 2.707564E-04) )
------------------------------------------------------------
Chi-Squared = 47.27606 using 59 PHA bins.
Reduced chi-squared = 0.8294045 for 57 degrees of freedom
Null hypothesis probability = 0.817
Photon flux (15-150 keV) in 16.00 sec: 8.077851E-02 ( -0.0315532 0.0315605 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.9948e-08 ( -3.69645e-08 4.09733e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 81.000 sec. to 97.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.78533 ( )
Epeak [keV] : 32.5523 ( -8.30136 11.6019 )
Norm@50keV : 0.172385 ( -0.975182 3.04400 )
------------------------------------------------------------
Chi-Squared = 46.20366 using 59 PHA bins.
Reduced chi-squared = 0.8250653 for 56 degrees of freedom
Null hypothesis probability = 0.822
Photon flux (15-150 keV) in 16.00 sec: 7.359449E-02 ( -0.0278408 0.0317225 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.59003e-08 ( -2.23611e-08 5.46861e-08 ) ergs/cm2
Band function
Time interval is from 81.000 sec. to 97.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48807 ( -7.77423 3.22561 )
beta : -9.34268 ( -6.80098 1.63016 )
Epeak [keV] : 36.3043 ( -32.5339 66.0806 )
Norm@50keV : 1.148400E-03 ( -1.43252 16.1959 )
------------------------------------------------------------
Chi-Squared = 46.98996 using 59 PHA bins.
Reduced chi-squared = 0.8543630 for 55 degrees of freedom
Null hypothesis probability = 0.770
Photon flux (15-150 keV) in 16.00 sec: 7.990231E-02 ( -0.0305131 0.0310747 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.96512e-08 ( -3.23458e-08 3.93128e-08 ) ergs/cm2
Plot creation:
Sun Jul 6 03:06:44 EDT 2008