batgrbproduct Analysis for Trigger=359479
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): Sun Aug 9 02:47:53 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger359479/GCN5_download_cron
======================================================================
Trigger: 00359479 Segment: 000
BAT Trigger Time: 271477760.952 [s; MET]
Trigger Stop: 271477761.016 [s; MET]
UTC: 2009-08-09T02:29:15.970340 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 270.498056903271 Dec: 39.82942005917 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.86
Image Trigger?: NO
Rate S/N Ratio: 8.36660026534076 [ if not an image trigger ]
Image S/N Ratio: 5.86
Flight Position: [ source = BAT ]
RA: 270.498056903271 Dec: 39.82942005917 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 270.553632742424 Dec: 39.8874172380597 [deg; J2000]
{ 18h 02m 12.9s , +39d 53' 14.7" }
+/- 3.71849580166395 [arcmin] (estimated 90% radius based on SNR)
+/- 1.96967129629851 [arcmin] (formal 1-sigma fit error)
SNR: 4.65916357322183
Angular difference between Flight and Ground position is 4.319872 arcmin
Partial Coding Fraction: 0.8125 [ 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 -0.003195 0.000097 0.007878 0.007066
0.001715 0.001661 0.001681 0.001885 [error]
Peak -0.003195 0.000097 0.007878 0.007066
0.001715 0.001661 0.001681 0.001885 [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 7.23e-11 4.57e-10 2.51e-09 6.35e-08 8.27e-09 6.77e-08 erg/cm2
Error 1.54e-10 5.61e-10 1.95e-09 9.06e-08 5.01e-09 9.15e-08 erg/cm2
Peak flux Power-law 3.50e-02 1.17e-01 3.21e-01 2.62e+00 8.78e-01 3.12e+00 ph/cm2/s
Error 7.57e-02 1.48e-01 2.54e-01 2.93e+00 6.87e-01 2.83e+00 ph/cm2/s
Fluence Cutoff-PL 4.66e-11 5.80e-10 3.52e-09 8.51e-09 8.25e-09 1.28e-08 erg/cm2
Error 1.30e-10 6.68e-10 2.65e-09 1.05e-07 3.73e-09 1.05e-07 erg/cm2
Peak flux Cutoff-PL 2.32e-02 1.50e-01 4.62e-01 5.31e-01 9.54e-01 1.16e+00 ph/cm2/s
Error 6.37e-02 1.86e-01 3.50e-01 2.60e+00 6.97e-01 3.22e+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 -0.464 1.358 - - 5.30e-03 5.38e-03 69.740 57
CPL -4.942 0.000 96.8 130.0 3.52e-01 2.63e-01 68.360 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.464 1.358 - - 5.30e-03 5.38e-03 69.740 57
CPL -4.942 0.000 96.8 130.0 3.52e-01 2.63e-01 68.360 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
270.5536 +39.8874 0.0414 29.8 -25.8 0.0159 4.7 TRIG_00359479
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.952 -8.952 (delta_t = 52.000 [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: -0.464118 ( -1.76202 0.954688 )
Norm@50keV : 5.29710E-03 ( -0.00533956 0.00541215 )
------------------------------------------------------------
# Chi-Squared = 69.74 using 59 PHA bins.
# Reduced chi-squared = 1.224 for 57 degrees of freedom
# Null hypothesis probability = 1.198347e-01
Photon flux (15-150 keV) in 0.064 sec: 0.878429 ( -0.878429 0.496109 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.27206e-09 ( -6.26319e-09 3.75148e-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: -4.94196 ( )
Epeak [keV] : 96.8115 ( -23.3666 236.547 )
Norm@50keV : 0.352246 ( -0.352246 0.174707 )
------------------------------------------------------------
# Chi-Squared = 68.36 using 59 PHA bins.
# Reduced chi-squared = 1.221 for 56 degrees of freedom
# Null hypothesis probability = 1.242824e-01
Photon flux (15-150 keV) in 0.064 sec: 0.953801 ( -0.953801 0.440449 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.24614e-09 ( -3.6937e-09 3.76141e-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 : 4.38038 ( 0.227454 0.227454 )
beta : -1.08409 ( 1.0859 2.37394 )
Epeak [keV] : 96.7507 ( -96.7534 102.915 )
Norm@50keV : 0.256143 ( -0.254414 0.250451 )
------------------------------------------------------------
# Chi-Squared = 67.67 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 55 degrees of freedom
# Null hypothesis probability = 1.173205e-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: -0.464118 ( -1.76202 0.954688 )
Norm@50keV : 5.29710E-03 ( -0.00533956 0.00541215 )
------------------------------------------------------------
# Chi-Squared = 69.74 using 59 PHA bins.
# Reduced chi-squared = 1.224 for 57 degrees of freedom
# Null hypothesis probability = 1.198347e-01
Photon flux (15-150 keV) in 0.064 sec: 0.878429 ( -0.878429 0.496109 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.27206e-09 ( -6.26319e-09 3.75148e-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: -4.94196 ( )
Epeak [keV] : 96.8115 ( -23.3666 236.547 )
Norm@50keV : 0.352246 ( -0.352246 0.174707 )
------------------------------------------------------------
# Chi-Squared = 68.36 using 59 PHA bins.
# Reduced chi-squared = 1.221 for 56 degrees of freedom
# Null hypothesis probability = 1.242824e-01
Photon flux (15-150 keV) in 0.064 sec: 0.953801 ( -0.953801 0.440449 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.24614e-09 ( -3.6937e-09 3.76141e-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 : 4.38038 ( 0.227454 0.227454 )
beta : -1.08409 ( 1.0859 2.37394 )
Epeak [keV] : 96.7507 ( -96.7534 102.915 )
Norm@50keV : 0.256143 ( -0.254414 0.250451 )
------------------------------------------------------------
# Chi-Squared = 67.67 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 55 degrees of freedom
# Null hypothesis probability = 1.173205e-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:
Sun Aug 9 03:02:40 EDT 2009