batgrbproduct Analysis for Trigger=354627
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): Thu Jun 11 20:48:09 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger354627/GCN5_download_cron
======================================================================
Trigger: 00354627 Segment: 000
BAT Trigger Time: 266435071.324 [s; MET]
Trigger Stop: 266435071.388 [s; MET]
UTC: 2009-06-11T17:44:26.505460 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 277.487286138202 Dec: -0.148921090952789 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.69
Image Trigger?: NO
Rate S/N Ratio: 6 [ if not an image trigger ]
Image S/N Ratio: 5.69
Flight Position: [ source = BAT ]
RA: 277.487286138202 Dec: -0.148921090952789 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 277.456183816341 Dec: -0.183621039360365 [deg; J2000]
{ 18h 29m 49.5s , -00d 11' 01.0" }
+/- 3.82245127929989 [arcmin] (estimated 90% radius based on SNR)
+/- 1.87418130579915 [arcmin] (formal 1-sigma fit error)
SNR: 4.47920868149019
Angular difference between Flight and Ground position is 2.795918 arcmin
Partial Coding Fraction: 0.9609375 [ 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 0.008200 -0.000088 -0.000436 0.001157
0.001681 0.001462 0.001226 0.001279 [error]
Peak 0.008200 -0.000088 -0.000436 0.001157
0.001681 0.001462 0.001226 0.001279 [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 1.36e-09 7.16e-10 2.34e-10 9.86e-11 2.37e-09 2.43e-09 erg/cm2
Error 7.07e-10 6.51e-10 3.62e-10 3.41e-10 1.44e-09 1.55e-09 erg/cm2
Peak flux Power-law 7.18e-01 2.15e-01 3.50e-02 6.57e-03 9.72e-01 9.75e-01 ph/cm2/s
Error 3.72e-01 1.54e-01 5.24e-02 2.06e-02 5.09e-01 5.06e-01 ph/cm2/s
Fluence Cutoff-PL 1.36e-09 7.17e-10 2.34e-10 9.77e-11 2.37e-09 2.41e-09 erg/cm2
Error 7.07e-10 6.51e-10 3.62e-10 3.38e-10 1.44e-09 1.55e-09 erg/cm2
Peak flux Cutoff-PL 9.78e-01 2.70e-01 2.22e-03 3.55e-08 1.25e+00 1.25e+00 ph/cm2/s
Error 4.01e-01 1.47e-01 6.92e-03 7.56e-06 4.97e-01 4.98e-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 3.614 1.205 - - 2.19e-03 2.64e-03 68.710 57
CPL 1.000 0.000 50.0 0.0 1.02e-02 0.00e+00 76.640 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.614 1.205 - - 2.19e-03 2.64e-03 68.710 57
CPL 1.000 0.000 50.0 0.0 1.02e-02 0.00e+00 76.640 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
277.4562 -0.1836 0.0429 22.5 -171.5 0.0130 4.5 TRIG_00354627
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.324 -7.324 (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 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.61377 ( -1.00445 1.40628 )
Norm@50keV : 2.18568E-03 ( -0.0021895 0.00308208 )
------------------------------------------------------------
# Chi-Squared = 68.71 using 59 PHA bins.
# Reduced chi-squared = 1.205 for 57 degrees of freedom
# Null hypothesis probability = 1.375751e-01
Photon flux (15-150 keV) in 0.064 sec: 0.972451 ( -0.507983 0.510231 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.36908e-09 ( -1.32084e-09 1.55127e-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: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.01665E-02 ( )
------------------------------------------------------------
# Chi-Squared = 76.64 using 59 PHA bins.
# Reduced chi-squared = 1.369 for 56 degrees of freedom
# Null hypothesis probability = 3.489526e-02
Photon flux (15-150 keV) in 0.064 sec: 1.24970 ( -0.497148 0.49756 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.36915e-09 ( -1.3216e-09 1.55078e-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 : 4.99069 ( -217.185 -207.186 )
beta : -9.99721 ( 1135.49 1145.47 )
Epeak [keV] : 19.3344 ( -2.90297 3.96017 )
Norm@50keV : 1.39302E+04 ( -5662.93 27534.7 )
------------------------------------------------------------
# Chi-Squared = 59.80 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 55 degrees of freedom
# Null hypothesis probability = 3.058243e-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: 3.61377 ( -1.00445 1.40628 )
Norm@50keV : 2.18568E-03 ( -0.0021895 0.00308208 )
------------------------------------------------------------
# Chi-Squared = 68.71 using 59 PHA bins.
# Reduced chi-squared = 1.205 for 57 degrees of freedom
# Null hypothesis probability = 1.375751e-01
Photon flux (15-150 keV) in 0.064 sec: 0.972451 ( -0.507983 0.510231 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.36908e-09 ( -1.32084e-09 1.55127e-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: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.01665E-02 ( )
------------------------------------------------------------
# Chi-Squared = 76.64 using 59 PHA bins.
# Reduced chi-squared = 1.369 for 56 degrees of freedom
# Null hypothesis probability = 3.489526e-02
Photon flux (15-150 keV) in 0.064 sec: 1.24970 ( -0.497148 0.49756 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.36915e-09 ( -1.3216e-09 1.55078e-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 : 4.99069 ( -217.186 -207.186 )
beta : -9.99721 ( 1135.49 1145.47 )
Epeak [keV] : 19.3344 ( -2.90297 3.96017 )
Norm@50keV : 1.39302E+04 ( -5662.93 27534.7 )
------------------------------------------------------------
# Chi-Squared = 59.80 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 55 degrees of freedom
# Null hypothesis probability = 3.058243e-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:
Thu Jun 11 20:53:47 EDT 2009