batgrbproduct Analysis for Trigger=357858
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): Tue Jul 21 18:50:15 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger357858/GCN5_download_cron
======================================================================
Trigger: 00357858 Segment: 000
BAT Trigger Time: 269836247.676 [s; MET]
Trigger Stop: 269836247.708 [s; MET]
UTC: 2009-07-21T02:30:42.747520 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 295.979058486361 Dec: 67.7232652698741 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.9
Image Trigger?: NO
Rate S/N Ratio: 6.32455532033676 [ if not an image trigger ]
Image S/N Ratio: 5.9
Flight Position: [ source = BAT ]
RA: 295.979058486361 Dec: 67.7232652698741 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 295.911184720101 Dec: 67.6853889104272 [deg; J2000]
{ 19h 43m 38.7s , +67d 41' 07.4" }
+/- 6.54786178857063 [arcmin] (estimated 90% radius based on SNR)
+/- 3.70221000753129 [arcmin] (formal 1-sigma fit error)
SNR: 2.07616538507689
Angular difference between Flight and Ground position is 2.748039 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 0.0320000052452087 +/-
Measured from: 0
to: 0.0320000052452087 [s; relative to TRIGTIME]
T50: 0.0320000052452087 +/-
Measured from: 0
to: 0.0320000052452087 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0320000052452087 second)
Measured from: 2.98023223876953e-08
to: 0.0320000350475311 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0320000052452087 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.005159 0.000264 -0.000813 -0.000732
0.001188 0.001164 0.001043 0.001186 [error]
Peak 0.005159 0.000264 -0.000813 -0.000732
0.001188 0.001164 0.001043 0.001186 [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 3.06e-10 3.18e-10 2.33e-10 2.74e-10 9.62e-10 1.13e-09 erg/cm2
Error 3.29e-10 3.08e-10 2.49e-10 3.09e-09 9.36e-10 1.14e-09 erg/cm2
Peak flux Power-law 3.15e-01 1.82e-01 6.66e-02 3.23e-02 5.80e-01 5.95e-01 ph/cm2/s
Error 3.41e-01 1.77e-01 7.04e-02 2.29e-01 5.74e-01 5.86e-01 ph/cm2/s
Fluence Cutoff-PL 3.06e-10 3.18e-10 2.33e-10 2.72e-10 9.63e-10 1.11e-09 erg/cm2
Error 3.29e-10 3.09e-10 2.49e-10 3.45e-09 9.37e-10 1.41e-09 erg/cm2
Peak flux Cutoff-PL 3.15e-01 1.82e-01 6.67e-02 3.21e-02 5.81e-01 5.96e-01 ph/cm2/s
Error 3.41e-01 1.77e-01 7.05e-02 2.53e-01 5.75e-01 5.76e-01 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 2.449 2.684 - - 3.05e-03 3.03e-03 61.990 57
CPL 1.000 0.000 50.0 0.0 1.00e-02 0.00e+00 62.980 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.449 2.684 - - 3.05e-03 3.03e-03 61.990 57
CPL 1.000 0.000 50.0 0.0 1.00e-02 0.00e+00 62.980 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 0.032 0.000 0.032
T90 0.032 0.000 0.032
T50 0.032 0.000 0.032
Peak 0.032 0.000 0.032
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
295.9112 +67.6854 0.0924 20.4 -15.1 0.0047 2.1 TRIG_00357858
------------------------------------------
Foreground time interval of the image:
0.000 0.032 (delta_t = 0.032 [sec])
Background time interval of the image:
-60.676 -7.676 (delta_t = 53.000 [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.
- 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 0.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.44880 ( -2.4488 2.91855 )
Norm@50keV : 3.04721E-03 ( -0.00304724 0.00301278 )
------------------------------------------------------------
# Chi-Squared = 61.99 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 57 degrees of freedom
# Null hypothesis probability = 3.028823e-01
Photon flux (15-150 keV) in 0.032 sec: 0.580341 ( -0.580341 0.568558 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.62272e-10 ( -9.62272e-10 9.09638e-10 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.00001E-02 ( )
------------------------------------------------------------
# Chi-Squared = 62.98 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 56 degrees of freedom
# Null hypothesis probability = 2.430305e-01
Photon flux (15-150 keV) in 0.032 sec: 0.580590 ( -0.58059 0.56873 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.6312e-10 ( -9.6312e-10 9.10781e-10 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.36029 ( 1.88964 1.88964 )
beta : -9.37167 ( 2.63412 2.63412 )
Epeak [keV] : 20.3732 ( -4.458 -4.458 )
Norm@50keV : 1999.27 ( -1999.27 1406.76 )
------------------------------------------------------------
# Chi-Squared = 58.52 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Null hypothesis probability = 3.476291e-01
Photon flux (15-150 keV) in 0.032 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 0.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.44880 ( -2.4488 2.91855 )
Norm@50keV : 3.04721E-03 ( -0.00304724 0.00301278 )
------------------------------------------------------------
# Chi-Squared = 61.99 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 57 degrees of freedom
# Null hypothesis probability = 3.028823e-01
Photon flux (15-150 keV) in 0.032 sec: 0.580341 ( -0.580341 0.568558 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.62272e-10 ( -9.62272e-10 9.09638e-10 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.00001E-02 ( )
------------------------------------------------------------
# Chi-Squared = 62.98 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 56 degrees of freedom
# Null hypothesis probability = 2.430305e-01
Photon flux (15-150 keV) in 0.032 sec: 0.580590 ( -0.58059 0.56873 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.6312e-10 ( -9.6312e-10 9.10781e-10 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.36029 ( 1.88964 1.88964 )
beta : -9.37167 ( 2.63412 2.63412 )
Epeak [keV] : 20.3732 ( -4.458 -4.458 )
Norm@50keV : 1999.27 ( -1999.27 1406.76 )
------------------------------------------------------------
# Chi-Squared = 58.52 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Null hypothesis probability = 3.476291e-01
Photon flux (15-150 keV) in 0.032 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Tue Jul 21 19:07:42 EDT 2009