batgrbproduct Analysis for Trigger=381434
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 Dec 29 09:35:45 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger381434/GCN5_download_cron
======================================================================
Trigger: 00381434 Segment: 000
BAT Trigger Time: 283745229.416 [s; MET]
Trigger Stop: 283745229.48 [s; MET]
UTC: 2009-12-29T02:07:04.026500 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 74.8157170298384 Dec: -55.0421834227911 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.56
Image Trigger?: NO
Rate S/N Ratio: 8.12403840463596 [ if not an image trigger ]
Image S/N Ratio: 6.56
Flight Position: [ source = BAT ]
RA: 74.8157170298384 Dec: -55.0421834227911 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 74.7542399661944 Dec: -54.9952534603265 [deg; J2000]
{ 04h 59m 01.0s , -54d 59' 42.9" }
+/- 3.2819975369978 [arcmin] (estimated 90% radius based on SNR)
+/- 1.75046780853913 [arcmin] (formal 1-sigma fit error)
SNR: 5.5690103074071
Angular difference between Flight and Ground position is 3.521471 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
T50: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0640000104904175 second)
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.003176 0.001632 0.005482 0.004656
0.001265 0.001441 0.001369 0.001366 [error]
Peak 0.003176 0.001632 0.005482 0.004656
0.001265 0.001441 0.001369 0.001366 [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 4.60e-10 1.01e-09 1.74e-09 6.95e-09 4.76e-09 1.01e-08 erg/cm2
Error 4.68e-10 7.82e-10 1.39e-09 1.72e-08 3.76e-09 1.70e-08 erg/cm2
Peak flux Power-law 2.30e-01 2.75e-01 2.37e-01 3.49e-01 8.65e-01 1.09e+00 ph/cm2/s
Error 2.39e-01 2.16e-01 1.87e-01 7.11e-01 6.52e-01 6.66e-01 ph/cm2/s
Fluence Cutoff-PL 4.59e-10 1.01e-09 1.74e-09 6.89e-09 4.76e-09 1.01e-08 erg/cm2
Error 4.69e-10 7.83e-10 1.39e-09 1.71e-08 3.76e-09 1.70e-08 erg/cm2
Peak flux Cutoff-PL 2.30e-01 2.75e-01 2.37e-01 3.46e-01 8.64e-01 1.09e+00 ph/cm2/s
Error 2.39e-01 2.16e-01 1.87e-01 7.08e-01 6.52e-01 6.63e-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 1.214 1.354 - - 7.35e-03 3.59e-03 64.900 57
CPL 2.470 0.000 155.0 0.0 1.88e-03 0.00e+00 64.660 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.214 1.354 - - 7.35e-03 3.59e-03 64.900 57
CPL 2.470 0.000 155.0 0.0 1.88e-03 0.00e+00 64.660 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 0.064 0.000 0.064
T90 0.064 0.000 0.064
T50 0.064 0.000 0.064
Peak 0.064 0.000 0.064
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
74.7542 -54.9953 0.0344 12.5 -133.9 0.0145 5.6 TRIG_00381434
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.416 -5.416 (delta_t = 55.000 [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 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21421 ( -1.51262 1.19628 )
Norm@50keV : 7.35405E-03 ( -0.00359414 0.00359353 )
------------------------------------------------------------
# Chi-Squared = 64.90 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 57 degrees of freedom
# Null hypothesis probability = 2.205216e-01
Photon flux (15-150 keV) in 0.064 sec: 0.864797 ( -0.864812 0.439901 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.75804e-09 ( -4.75804e-09 2.75414e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.46956 ( )
Epeak [keV] : 154.955 ( )
Norm@50keV : 1.88304E-03 ( )
------------------------------------------------------------
# Chi-Squared = 64.66 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 56 degrees of freedom
# Null hypothesis probability = 2.000546e-01
Photon flux (15-150 keV) in 0.064 sec: 0.864339 ( -0.864339 0.439801 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.7571e-09 ( -4.7571e-09 2.75618e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.986906 ( 0.987095 0.987095 )
beta : -1.21307 ( 1.2128 1.51208 )
Epeak [keV] : 47.2155 ( -46.7293 -46.7293 )
Norm@50keV : 1.31120E-02 ( -0.0131235 12432.8 )
------------------------------------------------------------
# Chi-Squared = 64.90 using 59 PHA bins.
# Reduced chi-squared = 1.180 for 55 degrees of freedom
# Null hypothesis probability = 1.696149e-01
Photon flux (15-150 keV) in 0.064 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 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21421 ( -1.51262 1.19628 )
Norm@50keV : 7.35405E-03 ( -0.00359414 0.00359353 )
------------------------------------------------------------
# Chi-Squared = 64.90 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 57 degrees of freedom
# Null hypothesis probability = 2.205216e-01
Photon flux (15-150 keV) in 0.064 sec: 0.864797 ( -0.864812 0.439901 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.75804e-09 ( -4.75804e-09 2.75414e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.46956 ( )
Epeak [keV] : 154.955 ( )
Norm@50keV : 1.88304E-03 ( )
------------------------------------------------------------
# Chi-Squared = 64.66 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 56 degrees of freedom
# Null hypothesis probability = 2.000546e-01
Photon flux (15-150 keV) in 0.064 sec: 0.864339 ( -0.864339 0.439801 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.7571e-09 ( -4.7571e-09 2.75618e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.986906 ( 0.987095 0.987095 )
beta : -1.21307 ( 1.2128 1.51208 )
Epeak [keV] : 47.2155 ( -46.7293 -46.7293 )
Norm@50keV : 1.31120E-02 ( -0.0131235 12432.8 )
------------------------------------------------------------
# Chi-Squared = 64.90 using 59 PHA bins.
# Reduced chi-squared = 1.180 for 55 degrees of freedom
# Null hypothesis probability = 1.696149e-01
Photon flux (15-150 keV) in 0.064 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Tue Dec 29 09:52:57 EST 2009