batgrbproduct Analysis for Trigger=307695
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 Mar 26 22:25:18 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger307695/GCN5_download_cron
======================================================================
Trigger: 00307695 Segment: 000
BAT Trigger Time: 228198384 [s; MET]
Trigger Stop: 228198448 [s; MET]
UTC: 2008-03-26T04:26:21.329640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 19.6493277317378 Dec: 63.7407753366145 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 16.72
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 16.72
Flight Position: [ source = BAT ]
RA: 19.6493277317378 Dec: 63.7407753366145 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 19.6700426741832 Dec: 63.7189437575445 [deg; J2000]
{ 01h 18m 40.8s , +63d 43' 08.2" }
+/- 1.64221302795449 [arcmin] (estimated 90% radius based on SNR)
+/- 0.749510357062856 [arcmin] (formal 1-sigma fit error)
SNR: 14.9748320827845
RA = 1h 18m 40.8s (19.670043 deg.)
Dec = 63d 43' 8" (63.718944 deg.)
Angular difference between Flight and Ground position is 1.420720 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.714151 0.353227 0.063114 0.036354
0.038970 0.038307 0.033170 0.028942 [error]
Peak 0.714151 0.353227 0.063114 0.036354
0.038970 0.038307 0.033170 0.028942 [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 2.25e-07 1.47e-07 6.28e-08 3.65e-08 4.54e-07 4.72e-07 erg/cm2
Error 2.95e-08 2.28e-08 2.24e-08 2.40e-08 5.67e-08 6.66e-08 erg/cm2
Peak flux Power-law 1.18e-01 4.35e-02 9.26e-03 2.35e-03 1.72e-01 1.73e-01 ph/cm2/s
Error 1.59e-02 6.36e-03 3.19e-03 1.45e-03 1.82e-02 1.83e-02 ph/cm2/s
Fluence Cutoff-PL 2.25e-07 1.47e-07 6.27e-08 3.62e-08 4.53e-07 4.71e-07 erg/cm2
Error 2.95e-08 2.28e-08 2.24e-08 2.38e-08 5.67e-08 6.64e-08 erg/cm2
Peak flux Cutoff-PL 1.18e-01 4.35e-02 9.24e-03 2.33e-03 1.72e-01 1.73e-01 ph/cm2/s
Error 1.59e-02 6.36e-03 3.19e-03 1.44e-03 1.82e-02 1.83e-02 ph/cm2/s
Fluence Band 2.21e-07 1.48e-07 6.41e-08 6.89e-08 8.53e-07 4.77e-07 erg/cm2
Error 1.90e-08 2.10e-08 1.13e-08 1.55e-06 2.81e-05 0.00e+00 erg/cm2
Peak flux Band 1.17e-01 4.36e-02 9.34e-03 2.39e-03 1.72e-01 1.42e-01 ph/cm2/s
Error 1.36e-02 5.34e-03 3.42e-02 6.74e-04 1.82e-02 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.233 0.331 - - 5.25e-04 1.39e-04 59.793 57
CPL 1.952 0.531 1.1 0.0 4.06e-03 1.59e-03 62.073 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.233 0.331 - - 5.25e-04 1.39e-04 59.793 57
CPL 1.952 0.619 1.1 0.0 4.06e-03 1.59e-03 62.073 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
19.6700 +63.7189 0.0128 23.7 -176.4 1.1757 15.0 TRIG_00307695
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.23280 ( -0.314480 0.348309 )
Norm@50keV : 5.251737E-04 ( -1.339091E-04 1.432734E-04) )
------------------------------------------------------------
Chi-Squared = 59.79266 using 59 PHA bins.
Reduced chi-squared = 1.048994 for 57 degrees of freedom
Null hypothesis probability = 0.375
Photon flux (15-150 keV) in 64.00 sec: 0.171939 ( -0.018233 0.018247 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.53557e-07 ( -5.55821e-08 5.78547e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95206 ( -0.929694 0.132313 )
Epeak [keV] : 1.09851 ( )
Norm@50keV : 4.057541E-03 ( -1.361306E-03 1.813275E-03) )
------------------------------------------------------------
Chi-Squared = 62.07344 using 59 PHA bins.
Reduced chi-squared = 1.108454 for 56 degrees of freedom
Null hypothesis probability = 0.269
Photon flux (15-150 keV) in 64.00 sec: 0.171850 ( -0.018224 0.018236 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.53393e-07 ( -5.54925e-08 5.79302e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.39607 ( -7.24899 0.677469 )
beta : -3.33730 ( -0.348432 0.314822 )
Epeak [keV] : 10.8945 ( -10.7945 9989.11 )
Norm@50keV : 8.183042E-03 ( -1.820169E-02 1.947182E-02) )
------------------------------------------------------------
Chi-Squared = 64.41419 using 59 PHA bins.
Reduced chi-squared = 1.171167 for 55 degrees of freedom
Null hypothesis probability = 0.180
Photon flux (15-150 keV) in 64.00 sec: 0.171944 ( -0.018232 0.018155 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.52787e-07 ( -1.6777e-07 5.59747e-05 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.23280 ( -0.314480 0.348309 )
Norm@50keV : 5.251737E-04 ( -1.339091E-04 1.432734E-04) )
------------------------------------------------------------
Chi-Squared = 59.79266 using 59 PHA bins.
Reduced chi-squared = 1.048994 for 57 degrees of freedom
Null hypothesis probability = 0.375
Photon flux (15-150 keV) in 64.00 sec: 0.171939 ( -0.018233 0.018247 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.53557e-07 ( -5.55821e-08 5.78547e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95206 ( -0.929694 0.308723 )
Epeak [keV] : 1.09851 ( )
Norm@50keV : 4.057541E-03 ( -1.361306E-03 1.813275E-03) )
------------------------------------------------------------
Chi-Squared = 62.07344 using 59 PHA bins.
Reduced chi-squared = 1.108454 for 56 degrees of freedom
Null hypothesis probability = 0.269
Photon flux (15-150 keV) in 64.00 sec: 0.171850 ( -0.018224 0.018236 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.53393e-07 ( -5.54925e-08 5.79302e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.39607 ( -7.24899 0.677469 )
beta : -3.33730 ( -0.348432 0.314822 )
Epeak [keV] : 10.8945 ( -10.7945 9989.11 )
Norm@50keV : 8.183042E-03 ( -1.820169E-02 1.947182E-02) )
------------------------------------------------------------
Chi-Squared = 64.41419 using 59 PHA bins.
Reduced chi-squared = 1.171167 for 55 degrees of freedom
Null hypothesis probability = 0.180
Photon flux (15-150 keV) in 64.00 sec: 0.171944 ( -0.018232 0.018155 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.52787e-07 ( -1.6777e-07 5.59747e-05 ) ergs/cm2
Plot creation:
Wed Mar 26 22:44:10 EDT 2008