batgrbproduct Analysis for Trigger=359884
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 Aug 13 12:08:52 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger359884/GCN5_download_cron
======================================================================
Trigger: 00359884 Segment: 000
BAT Trigger Time: 271829448.148 [s; MET]
Trigger Stop: 271829448.212 [s; MET]
UTC: 2009-08-13T04:10:43.154900 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 227.017184468102 Dec: 88.572588434289 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.75
Image Trigger?: NO
Rate S/N Ratio: 32.5576411921994 [ if not an image trigger ]
Image S/N Ratio: 7.75
Flight Position: [ source = BAT ]
RA: 227.017184468102 Dec: 88.572588434289 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 225.067707461268 Dec: 88.5711011614867 [deg; J2000]
{ 15h 00m 16.2s , +88d 34' 16.0" }
+/- 1.31075967818517 [arcmin] (estimated 90% radius based on SNR)
+/- 0.452235420741034 [arcmin] (formal 1-sigma fit error)
SNR: 20.6646605451447
Angular difference between Flight and Ground position is 2.916484 arcmin
Partial Coding Fraction: 0.1835938 [ including projection effects ]
Duration
T90: 7.13999992609024 +/- 0.565416659857746
Measured from: -0.163999855518341
to: 6.9760000705719 [s; relative to TRIGTIME]
T50: 5.9559999704361 +/- 0.215295152888328
Measured from: 0.228000104427338
to: 6.18400007486343 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0400000214576721
to: 0.959999978542328 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.804000020027161
to: 7.31199997663498 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.657793 0.753568 0.561193 0.171177
0.042648 0.044785 0.039928 0.031663 [error]
Peak 0.244086 0.345097 0.348109 0.109194
0.019335 0.022732 0.021634 0.015791 [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 2.19e-07 3.58e-07 4.43e-07 1.08e-06 1.33e-06 2.10e-06 erg/cm2
Error 2.38e-08 2.37e-08 4.00e-08 2.07e-07 9.45e-08 2.40e-07 erg/cm2
Peak flux Power-law 2.49e+00 2.77e+00 2.21e+00 2.91e+00 8.54e+00 1.04e+01 ph/cm2/s
Error 3.09e-01 2.12e-01 1.73e-01 4.74e-01 5.92e-01 7.10e-01 ph/cm2/s
Fluence Cutoff-PL 2.19e-07 3.58e-07 4.43e-07 1.07e-06 1.33e-06 2.00e-06 erg/cm2
Error 2.38e-08 2.37e-08 4.00e-08 2.06e-07 9.46e-08 3.12e-07 erg/cm2
Peak flux Cutoff-PL 2.44e+00 2.80e+00 2.23e+00 2.55e+00 8.51e+00 1.00e+01 ph/cm2/s
Error 3.58e-01 2.36e-01 1.99e-01 8.20e-01 5.98e-01 1.06e+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 1.694 0.117 - - 1.76e-02 1.19e-03 54.960 57
CPL 1.694 0.162 9999.4 0.0 1.77e-02 0.00e+00 54.960 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.330 0.114 - - 7.12e-02 4.75e-03 72.240 57
CPL 1.217 0.305 370.2 0.0 8.08e-02 3.13e-02 72.020 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: 1.664000 sec.
T50 in the 50-300 keV band: 0.640000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 8.116 -0.804 7.312
T90 7.140 -0.164 6.976
T50 5.956 0.228 6.184
Peak 1.000 -0.040 0.960
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
225.0677 +88.5711 0.0094 41.1 -56.2 2.3833 20.7 TRIG_00359884
------------------------------------------
Foreground time interval of the image:
-0.804 7.312 (delta_t = 8.116 [sec])
Background time interval of the image:
-8.947 -0.804 (delta_t = 8.143 [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 -0.804 sec. to 7.312 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69374 ( -0.115856 0.117239 )
Norm@50keV : 1.76396E-02 ( -0.00119782 0.00118981 )
------------------------------------------------------------
# Chi-Squared = 54.96 using 59 PHA bins.
# Reduced chi-squared = 0.9642 for 57 degrees of freedom
# Null hypothesis probability = 5.521051e-01
Photon flux (15-150 keV) in 8.116 sec: 2.33764 ( -0.155477 0.155824 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32619e-06 ( -9.42909e-08 9.48014e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.804 sec. to 7.312 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69425 ( -0.117751 0.207223 )
Epeak [keV] : 9999.36 ( )
Norm@50keV : 1.76582E-02 ( )
------------------------------------------------------------
# Chi-Squared = 54.96 using 59 PHA bins.
# Reduced chi-squared = 0.9814 for 56 degrees of freedom
# Null hypothesis probability = 5.143085e-01
Photon flux (15-150 keV) in 8.116 sec: 2.33679 ( -0.15542 0.15576 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32632e-06 ( -9.4316e-08 9.48273e-08 ) ergs/cm2
Band function
Time interval is from -0.804 sec. to 7.312 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97662 ( -83.6998 -83.6998 )
beta : -1.75572 ( -0.161673 0.122895 )
Epeak [keV] : 22.6088 ( -22.6035 3.39346 )
Norm@50keV : 3973.35 ( -2261.46 3917.65 )
------------------------------------------------------------
# Chi-Squared = 52.56 using 59 PHA bins.
# Reduced chi-squared = 0.9557 for 55 degrees of freedom
# Null hypothesis probability = 5.683580e-01
Photon flux (15-150 keV) in 8.116 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 -0.040 sec. to 0.960 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33001 ( -0.114221 0.113642 )
Norm@50keV : 7.11881E-02 ( -0.00475541 0.00475361 )
------------------------------------------------------------
# Chi-Squared = 72.24 using 59 PHA bins.
# Reduced chi-squared = 1.267 for 57 degrees of freedom
# Null hypothesis probability = 8.405345e-02
Photon flux (15-150 keV) in 1 sec: 8.54169 ( -0.591489 0.592129 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.98457e-07 ( -5.09769e-08 5.11522e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.040 sec. to 0.960 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21741 ( -0.437128 0.173371 )
Epeak [keV] : 370.162 ( -370.167 -370.167 )
Norm@50keV : 8.07623E-02 ( -0.0137871 0.0489085 )
------------------------------------------------------------
# Chi-Squared = 72.02 using 59 PHA bins.
# Reduced chi-squared = 1.286 for 56 degrees of freedom
# Null hypothesis probability = 7.336809e-02
Photon flux (15-150 keV) in 1 sec: 8.50900 ( -0.59459 0.60094 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.94782e-07 ( -2.6694e-08 5.1974e-08 ) ergs/cm2
Band function
Time interval is from -0.040 sec. to 0.960 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97615 ( -92.0691 -82.0693 )
beta : -1.39179 ( -0.133947 0.124736 )
Epeak [keV] : 24.5046 ( -4.8173 3.92702 )
Norm@50keV : 7080.46 ( -4708.35 4545.03 )
------------------------------------------------------------
# Chi-Squared = 67.71 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 55 degrees of freedom
# Null hypothesis probability = 1.167168e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Thu Aug 13 12:35:46 EDT 2009