batgrbproduct Analysis for Trigger=358336
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 v2.45
Process Start Time (local time): Sun Jul 26 13:25:32 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger358336/GCN5_download_cron
======================================================================
Trigger: 00358336 Segment: 000
BAT Trigger Time: 270268810.816 [s; MET]
Trigger Stop: 270268811.84 [s; MET]
UTC: 2009-07-26T02:40:05.873500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 12.8629207326255 Dec: 67.5690760783838 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.91
Image Trigger?: NO
Rate S/N Ratio: 16.3401346383682 [ if not an image trigger ]
Image S/N Ratio: 5.91
Flight Position: [ source = BAT ]
RA: 12.8629207326255 Dec: 67.5690760783838 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 12.6724435705595 Dec: 67.5391744023948 [deg; J2000]
{ 00h 50m 41.4s , +67d 32' 21.0" }
+/- 5.61805290839555 [arcmin] (estimated 90% radius based on SNR)
+/- 4.16205300984865 [arcmin] (formal 1-sigma fit error)
SNR: 2.58393442110206
Angular difference between Flight and Ground position is 4.718000 arcmin
Partial Coding Fraction: 0.1328125 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: -2.98023223876953e-08
to: 1.02399995923042 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.039916 -0.000600 0.049130 0.078064
0.022075 0.025204 0.025896 0.031052 [error]
Peak -0.039916 -0.000600 0.049130 0.078064
0.022075 0.025204 0.025896 0.031052 [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 5.31e-10 4.00e-09 2.65e-08 9.14e-07 9.40e-08 9.59e-07 erg/cm2
Error 2.30e-09 7.75e-09 2.58e-08 1.06e-06 7.92e-08 1.07e-06 erg/cm2
Peak flux Power-law 1.62e-02 6.37e-02 2.10e-01 2.30e+00 5.94e-01 2.59e+00 ph/cm2/s
Error 7.11e-02 1.28e-01 2.10e-01 2.51e+00 5.69e-01 2.28e+00 ph/cm2/s
Fluence Cutoff-PL 1.77e-10 2.87e-09 3.01e-08 3.57e-07 1.02e-07 3.54e-07 erg/cm2
Error 2.19e-09 7.33e-09 3.15e-08 1.85e-06 8.34e-08 1.86e-06 erg/cm2
Peak flux Cutoff-PL 4.85e-03 4.22e-02 2.32e-01 1.13e+00 6.14e-01 1.42e+00 ph/cm2/s
Error 6.77e-02 1.23e-01 2.55e-01 4.15e+00 4.84e-01 4.02e+00 ph/cm2/s
Fluence Band 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 Band 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
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.719 1.429 - - 3.15e-03 4.53e-03 56.600 57
CPL -2.681 0.319 234.9 0.0 7.08e-03 1.67e-01 56.420 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.719 1.429 - - 3.15e-03 4.53e-03 56.600 57
CPL -2.681 0.319 234.9 0.0 7.08e-03 1.67e-01 56.420 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 -0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
12.6724 +67.5392 0.0744 54.9 -4.8 0.1475 2.6 TRIG_00358336
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-51.315 -10.816 (delta_t = 40.499 [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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.718693 ( -1.43818 1.42015 )
Norm@50keV : 3.14833E-03 ( -0.00314695 0.0059147 )
------------------------------------------------------------
# Chi-Squared = 56.60 using 59 PHA bins.
# Reduced chi-squared = 0.9930 for 57 degrees of freedom
# Null hypothesis probability = 4.900688e-01
Photon flux (15-150 keV) in 1.024 sec: 0.593670 ( -0.59367 0.54425 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.39728e-08 ( -9.4013e-08 6.43713e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.68102 ( 2.75071 3.38851 )
Epeak [keV] : 234.915 ( -220.195 -220.195 )
Norm@50keV : 7.07856E-03 ( -0.00770197 0.325879 )
------------------------------------------------------------
# Chi-Squared = 56.42 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 56 degrees of freedom
# Null hypothesis probability = 4.592071e-01
Photon flux (15-150 keV) in 1.024 sec: 0.613870 ( -0.455553 0.51298 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0156e-07 ( -1.0156e-07 6.52485e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.18669 ( 0.186528 0.186528 )
beta : -2.18430 ( 7.26912 9.38287 )
Epeak [keV] : 203.327 ( -117.259 -203.621 )
Norm@50keV : 9.08976E-03 ( -0.00898079 0.128837 )
------------------------------------------------------------
# Chi-Squared = 56.42 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 55 degrees of freedom
# Null hypothesis probability = 4.215578e-01
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.718693 ( -1.43818 1.42015 )
Norm@50keV : 3.14833E-03 ( -0.00314695 0.0059147 )
------------------------------------------------------------
# Chi-Squared = 56.60 using 59 PHA bins.
# Reduced chi-squared = 0.9930 for 57 degrees of freedom
# Null hypothesis probability = 4.900688e-01
Photon flux (15-150 keV) in 1.024 sec: 0.593670 ( -0.59367 0.54425 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.39728e-08 ( -9.4013e-08 6.43713e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.68102 ( 2.75071 3.38851 )
Epeak [keV] : 234.915 ( -220.195 -220.195 )
Norm@50keV : 7.07856E-03 ( -0.00770197 0.326454 )
------------------------------------------------------------
# Chi-Squared = 56.42 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 56 degrees of freedom
# Null hypothesis probability = 4.592071e-01
Photon flux (15-150 keV) in 1.024 sec: 0.613870 ( -0.455553 0.51298 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0156e-07 ( -1.0156e-07 6.52485e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.18669 ( 0.186528 0.186528 )
beta : -2.18430 ( 7.26912 9.38287 )
Epeak [keV] : 203.327 ( -117.259 -203.621 )
Norm@50keV : 9.08976E-03 ( -0.00898079 0.128826 )
------------------------------------------------------------
# Chi-Squared = 56.42 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 55 degrees of freedom
# Null hypothesis probability = 4.215578e-01
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sun Jul 26 13:49:08 EDT 2009