batgrbproduct Analysis for Trigger=358760
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): Sat Aug 1 05:42:17 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger358760/GCN5_download_cron
======================================================================
Trigger: 00358760 Segment: 000
BAT Trigger Time: 270737195.804 [s; MET]
Trigger Stop: 270737195.868 [s; MET]
UTC: 2009-07-31T12:46:30.846340 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 189.691562675699 Dec: -15.4089072936449 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.71
Image Trigger?: NO
Rate S/N Ratio: 6.48074069840786 [ if not an image trigger ]
Image S/N Ratio: 6.71
Flight Position: [ source = BAT ]
RA: 189.691562675699 Dec: -15.4089072936449 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 189.693319413174 Dec: -15.3632152432572 [deg; J2000]
{ 12h 38m 46.4s , -15d 21' 47.6" }
+/- 3.30326453344813 [arcmin] (estimated 90% radius based on SNR)
+/- 2.3613870322251 [arcmin] (formal 1-sigma fit error)
SNR: 5.51786067959574
Angular difference between Flight and Ground position is 2.743406 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.0639999508857727 +/-
Measured from: 0
to: 0.0639999508857727 [s; relative to TRIGTIME]
T50: 0.0639999508857727 +/-
Measured from: 0
to: 0.0639999508857727 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0639999508857727 second)
Measured from: -2.98023223876953e-08
to: 0.0639999210834503 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0639999508857727 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.000041 0.004015 0.006701 0.000400
0.001208 0.001285 0.001385 0.001163 [error]
Peak 0.000041 0.004015 0.006701 0.000400
0.001208 0.001285 0.001385 0.001163 [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 3.83e-10 3.80e-10 2.63e-10 2.87e-10 1.14e-09 1.31e-09 erg/cm2
Error 3.96e-10 3.05e-10 1.89e-10 3.07e-10 8.79e-10 9.56e-10 erg/cm2
Peak flux Power-law 1.97e-01 1.09e-01 3.78e-02 1.71e-02 3.54e-01 3.58e-01 ph/cm2/s
Error 2.06e-01 8.85e-02 2.71e-02 1.72e-02 3.06e-01 3.06e-01 ph/cm2/s
Fluence Cutoff-PL 4.32e-10 1.78e-09 1.45e-09 3.77e-09 0.00e+00 0.00e+00 erg/cm2
Error 3.14e-10 7.23e-10 6.30e-10 1.42e-09 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.10e-01 4.80e-01 2.20e-01 9.08e-03 9.14e-01 9.21e-01 ph/cm2/s
Error 1.23e-01 1.96e-01 9.29e-02 6.71e-03 3.59e-01 3.60e-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 2.515 0.938 - - 1.76e-03 1.52e-03 86.280 57
CPL -3.896 -0.622 50.9 8.5 4.83e+00 5.61e+00 71.720 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.515 0.938 - - 1.76e-03 1.52e-03 86.280 57
CPL -3.896 -0.622 50.9 8.5 4.83e+00 5.61e+00 71.720 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
189.6933 -15.3632 0.0349 10.5 -170.9 0.0129 5.5 TRIG_00358760
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.804 -3.804 (delta_t = 57.000 [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: 2.51495 ( -1.13729 0.738109 )
Norm@50keV : 1.75680E-03 ( -0.00176253 0.00128113 )
------------------------------------------------------------
# Chi-Squared = 86.28 using 59 PHA bins.
# Reduced chi-squared = 1.514 for 57 degrees of freedom
# Null hypothesis probability = 7.396719e-03
Photon flux (15-150 keV) in 0.064 sec: 0.353825 ( -0.29428 0.317046 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.141e-09 ( -8.7031e-10 8.88019e-10 ) 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: -3.89600 ( 3.90364 2.66052 )
Epeak [keV] : 50.8720 ( -9.48428 7.41621 )
Norm@50keV : 4.82983 ( -4.86376 6.35185 )
------------------------------------------------------------
# Chi-Squared = 71.72 using 59 PHA bins.
# Reduced chi-squared = 1.281 for 56 degrees of freedom
# Null hypothesis probability = 7.681618e-02
Photon flux (15-150 keV) in 0.064 sec: 0.914070 ( -0.358776 0.35871 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 : 3.86610 ( -4.23129 -5.51227 )
beta : -9.99601 ( 792.088 802.08 )
Epeak [keV] : 50.6238 ( -10.5791 6.76528 )
Norm@50keV : 4.82872 ( -4.81022 6.44754 )
------------------------------------------------------------
# Chi-Squared = 71.73 using 59 PHA bins.
# Reduced chi-squared = 1.304 for 55 degrees of freedom
# Null hypothesis probability = 6.437978e-02
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: 2.51495 ( -1.13729 0.738109 )
Norm@50keV : 1.75680E-03 ( -0.00176253 0.00128113 )
------------------------------------------------------------
# Chi-Squared = 86.28 using 59 PHA bins.
# Reduced chi-squared = 1.514 for 57 degrees of freedom
# Null hypothesis probability = 7.396719e-03
Photon flux (15-150 keV) in 0.064 sec: 0.353825 ( -0.29428 0.317046 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.141e-09 ( -8.7031e-10 8.88019e-10 ) 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: -3.89600 ( 3.90364 2.66052 )
Epeak [keV] : 50.8720 ( -9.48428 7.41621 )
Norm@50keV : 4.82983 ( -4.86376 6.35185 )
------------------------------------------------------------
# Chi-Squared = 71.72 using 59 PHA bins.
# Reduced chi-squared = 1.281 for 56 degrees of freedom
# Null hypothesis probability = 7.681618e-02
Photon flux (15-150 keV) in 0.064 sec: 0.914070 ( -0.358776 0.35871 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 : 3.86610 ( -4.2312 -5.51227 )
beta : -9.99601 ( 792.088 802.08 )
Epeak [keV] : 50.6238 ( -10.5791 6.76528 )
Norm@50keV : 4.82872 ( -4.81022 6.44754 )
------------------------------------------------------------
# Chi-Squared = 71.73 using 59 PHA bins.
# Reduced chi-squared = 1.304 for 55 degrees of freedom
# Null hypothesis probability = 6.437978e-02
Photon flux (15-150 keV) in 0.064 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sat Aug 1 05:53:03 EDT 2009