batgrbproduct Analysis for Trigger=357951
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): Wed Jul 22 17:30:50 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger357951/GCN5_download_cron
======================================================================
Trigger: 00357951 Segment: 000
BAT Trigger Time: 269947694.376 [s; MET]
Trigger Stop: 269947694.38 [s; MET]
UTC: 2009-07-22T09:28:09.443900 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 205.634382331794 Dec: 53.4955934326504 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.06
Image Trigger?: NO
Rate S/N Ratio: 7.81024967590665 [ if not an image trigger ]
Image S/N Ratio: 6.06
Flight Position: [ source = BAT ]
RA: 205.634382331794 Dec: 53.4955934326504 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 205.553586142505 Dec: 53.4547972927602 [deg; J2000]
{ 13h 42m 12.9s , +53d 27' 17.3" }
+/- 4.19379389658429 [arcmin] (estimated 90% radius based on SNR)
+/- 2.13118402238188 [arcmin] (formal 1-sigma fit error)
SNR: 3.92355450000909
Angular difference between Flight and Ground position is 3.783681 arcmin
Partial Coding Fraction: 0.5625 [ including projection effects ]
Duration
T90: 0.00400000810623169 +/-
Measured from: 0
to: 0.00400000810623169 [s; relative to TRIGTIME]
T50: 0.00400000810623169 +/-
Measured from: 0
to: 0.00400000810623169 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.00400000810623169 second)
Measured from: 2.98023223876953e-08
to: 0.00400003790855408 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.00400000810623169 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.001169 0.004508 0.000240 0.000175
0.000778 0.001152 0.000658 0.001051 [error]
Peak 0.001169 0.004508 0.000240 0.000175
0.000778 0.001152 0.000658 0.001051 [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 3.45e-10 3.18e-10 2.03e-10 1.99e-10 9.48e-10 1.09e-09 erg/cm2
Error 3.53e-10 3.47e-10 3.48e-10 1.01e-09 1.11e-09 2.41e-09 erg/cm2
Peak flux Power-law 2.85e+00 1.47e+00 4.68e-01 1.92e-01 4.89e+00 4.97e+00 ph/cm2/s
Error 2.94e+00 1.57e+00 7.78e-01 8.24e-01 4.96e+00 5.10e+00 ph/cm2/s
Fluence Cutoff-PL 4.94e-10 7.71e-10 1.21e-10 4.40e-13 1.39e-09 1.39e-09 erg/cm2
Error 3.43e-10 6.76e-10 2.11e-10 1.58e-11 9.45e-10 9.45e-10 erg/cm2
Peak flux Cutoff-PL 3.93e+00 3.58e+00 3.18e-01 6.06e-04 7.82e+00 7.78e+00 ph/cm2/s
Error 2.73e+00 2.57e+00 5.80e-01 2.10e-02 4.98e+00 4.97e+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 2.637 0.000 - - 2.28e-02 3.02e-02 37.170 57
CPL -4.981 0.000 30.3 8.1 3.75e+03 3.93e+03 31.800 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.637 0.000 - - 2.28e-02 3.02e-02 37.170 57
CPL -4.981 0.000 30.3 8.1 3.75e+03 3.93e+03 31.800 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 0.004 0.000 0.004
T90 0.004 0.000 0.004
T50 0.004 0.000 0.004
Peak 0.004 0.000 0.004
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
205.5536 +53.4548 0.0492 37.8 -150.7 0.0069 3.9 TRIG_00357951
------------------------------------------
Foreground time interval of the image:
0.000 0.004 (delta_t = 0.004 [sec])
Background time interval of the image:
-60.376 -35.236 (delta_t = 25.140 [sec])
-34.376 -6.376 (delta_t = 28.000 [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 0.004 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.63737 ( -2.65506 -2.65506 )
Norm@50keV : 2.28200E-02 ( -0.022734 0.0375774 )
------------------------------------------------------------
# Chi-Squared = 37.17 using 59 PHA bins.
# Reduced chi-squared = 0.6522 for 57 degrees of freedom
# Null hypothesis probability = 9.805830e-01
Photon flux (15-150 keV) in 0.004 sec: 4.89171 ( -4.89171 5.02576 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.48224e-10 ( -9.48224e-10 1.27832e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.004 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.98092 ( )
Epeak [keV] : 30.3480 ( -8.16876 8.00262 )
Norm@50keV : 3749.06 ( -3746.64 4113.63 )
------------------------------------------------------------
# Chi-Squared = 31.80 using 59 PHA bins.
# Reduced chi-squared = 0.5679 for 56 degrees of freedom
# Null hypothesis probability = 9.962193e-01
Photon flux (15-150 keV) in 0.004 sec: 7.82333 ( -4.97067 4.99827 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38743e-09 ( -9.10844e-10 9.78688e-10 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.004 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99081 ( -219.813 -209.813 )
beta : -9.37164 ( 9.99999 19.3957 )
Epeak [keV] : 29.8559 ( -7.70197 8.5345 )
Norm@50keV : 4208.53 ( -4208.54 6559.92 )
------------------------------------------------------------
# Chi-Squared = 31.83 using 59 PHA bins.
# Reduced chi-squared = 0.5786 for 55 degrees of freedom
# Null hypothesis probability = 9.948150e-01
Photon flux (15-150 keV) in 0.004 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 0.004 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.63737 ( -2.65506 -2.65506 )
Norm@50keV : 2.28200E-02 ( -0.022734 0.0375774 )
------------------------------------------------------------
# Chi-Squared = 37.17 using 59 PHA bins.
# Reduced chi-squared = 0.6522 for 57 degrees of freedom
# Null hypothesis probability = 9.805830e-01
Photon flux (15-150 keV) in 0.004 sec: 4.89171 ( -4.89171 5.02576 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.48224e-10 ( -9.48224e-10 1.27832e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.004 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.98092 ( )
Epeak [keV] : 30.3480 ( -8.16876 8.00262 )
Norm@50keV : 3749.06 ( -3746.64 4113.63 )
------------------------------------------------------------
# Chi-Squared = 31.80 using 59 PHA bins.
# Reduced chi-squared = 0.5679 for 56 degrees of freedom
# Null hypothesis probability = 9.962193e-01
Photon flux (15-150 keV) in 0.004 sec: 7.82333 ( -4.97067 4.99827 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38743e-09 ( -9.10844e-10 9.78688e-10 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.004 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99081 ( -219.812 -209.813 )
beta : -9.37164 ( 9.99999 19.3957 )
Epeak [keV] : 29.8559 ( -7.70197 8.5345 )
Norm@50keV : 4208.53 ( -4208.54 6559.92 )
------------------------------------------------------------
# Chi-Squared = 31.83 using 59 PHA bins.
# Reduced chi-squared = 0.5786 for 55 degrees of freedom
# Null hypothesis probability = 9.948150e-01
Photon flux (15-150 keV) in 0.004 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Wed Jul 22 17:41:32 EDT 2009