batgrbproduct Analysis for Trigger=360857
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): Wed Aug 26 02:42:18 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger360857/GCN5_download_cron
======================================================================
Trigger: 00360857 Segment: 000
BAT Trigger Time: 272912361.024 [s; MET]
Trigger Stop: 272912363.072 [s; MET]
UTC: 2009-08-25T16:59:15.995400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 257.801836220526 Dec: 28.0448810938626 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.07
Image Trigger?: NO
Rate S/N Ratio: 5.3851648071345 [ if not an image trigger ]
Image S/N Ratio: 6.07
Flight Position: [ source = BAT ]
RA: 257.801836220526 Dec: 28.0448810938626 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 257.838649722139 Dec: 28.0864724387974 [deg; J2000]
{ 17h 11m 21.3s , +28d 05' 11.3" }
+/- 4.6539642429346 [arcmin] (estimated 90% radius based on SNR)
+/- 2.89951547321214 [arcmin] (formal 1-sigma fit error)
SNR: 3.38131368757803
Angular difference between Flight and Ground position is 3.166435 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 2.04800003767014 +/-
Measured from: 0
to: 2.04800003767014 [s; relative to TRIGTIME]
T50: 2.04800003767014 +/-
Measured from: 0
to: 2.04800003767014 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 2.04800003767014 second)
Measured from: -2.98023223876953e-08
to: 2.04800000786781 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 2.04800003767014 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.012491 0.031987 0.029856 -0.010823
0.009113 0.009235 0.008157 0.006807 [error]
Peak 0.012491 0.031987 0.029856 -0.010823
0.009113 0.009235 0.008157 0.006807 [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 6.73e-09 1.22e-08 1.70e-08 4.92e-08 4.87e-08 8.50e-08 erg/cm2
Error 3.41e-09 4.24e-09 7.35e-09 4.35e-08 1.83e-08 5.04e-08 erg/cm2
Peak flux Power-law 1.06e-01 1.05e-01 7.32e-02 8.04e-02 3.16e-01 3.65e-01 ph/cm2/s
Error 5.46e-02 3.71e-02 3.08e-02 6.54e-02 1.08e-01 1.25e-01 ph/cm2/s
Fluence Cutoff-PL 2.42e-09 1.44e-08 2.29e-08 4.88e-09 4.41e-08 4.48e-08 erg/cm2
Error 3.06e-09 5.75e-09 9.80e-09 1.34e-08 1.62e-08 1.99e-08 erg/cm2
Peak flux Cutoff-PL 3.58e-02 1.18e-01 1.03e-01 1.25e-02 2.68e-01 2.69e-01 ph/cm2/s
Error 3.93e-02 4.92e-02 4.18e-02 2.72e-02 1.01e-01 1.03e-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 1.525 0.530 - - 2.51e-03 8.85e-04 55.400 57
CPL -2.417 0.428 62.4 25.3 1.40e-01 6.08e-01 50.600 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.525 0.530 - - 2.51e-03 8.85e-04 55.400 57
CPL -2.417 0.428 62.4 25.3 1.40e-01 6.08e-01 50.600 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 2.048 0.000 2.048
T90 2.048 0.000 2.048
T50 2.048 0.000 2.048
Peak 2.048 -0.000 2.048
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
257.8386 +28.0865 0.0568 30.7 -156.3 0.0579 3.4 TRIG_00360857
------------------------------------------
Foreground time interval of the image:
0.000 2.048 (delta_t = 2.048 [sec])
Background time interval of the image:
-60.024 -9.024 (delta_t = 51.000 [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 2.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52536 ( -0.510748 0.549373 )
Norm@50keV : 2.51447E-03 ( -0.00088979 0.000879919 )
------------------------------------------------------------
# Chi-Squared = 55.40 using 59 PHA bins.
# Reduced chi-squared = 0.9719 for 57 degrees of freedom
# Null hypothesis probability = 5.354815e-01
Photon flux (15-150 keV) in 2.048 sec: 0.316236 ( -0.10802 0.108654 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.87191e-08 ( -1.79979e-08 1.86919e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.41696 ( 2.48821 3.34387 )
Epeak [keV] : 62.4386 ( -14.383 36.293 )
Norm@50keV : 0.140485 ( -0.187141 1.02812 )
------------------------------------------------------------
# Chi-Squared = 50.60 using 59 PHA bins.
# Reduced chi-squared = 0.9035 for 56 degrees of freedom
# Null hypothesis probability = 6.788731e-01
Photon flux (15-150 keV) in 2.048 sec: 0.268146 ( -0.08316 0.117893 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.41342e-08 ( -1.46293e-08 1.76912e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.21458 ( -15.2476 -5.50295 )
beta : -9.99975 ( 12625.1 12635.1 )
Epeak [keV] : 61.5944 ( -14.1786 36.4673 )
Norm@50keV : 0.294102 ( -0.294159 0.850796 )
------------------------------------------------------------
# Chi-Squared = 50.58 using 59 PHA bins.
# Reduced chi-squared = 0.9195 for 55 degrees of freedom
# Null hypothesis probability = 6.442070e-01
Photon flux (15-150 keV) in 2.048 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 2.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52536 ( -0.510748 0.549373 )
Norm@50keV : 2.51447E-03 ( -0.00088979 0.000879919 )
------------------------------------------------------------
# Chi-Squared = 55.40 using 59 PHA bins.
# Reduced chi-squared = 0.9719 for 57 degrees of freedom
# Null hypothesis probability = 5.354815e-01
Photon flux (15-150 keV) in 2.048 sec: 0.316236 ( -0.10802 0.108654 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.87191e-08 ( -1.79979e-08 1.86919e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.41696 ( 2.48821 3.34387 )
Epeak [keV] : 62.4386 ( -14.383 36.293 )
Norm@50keV : 0.140485 ( -0.187141 1.02812 )
------------------------------------------------------------
# Chi-Squared = 50.60 using 59 PHA bins.
# Reduced chi-squared = 0.9035 for 56 degrees of freedom
# Null hypothesis probability = 6.788731e-01
Photon flux (15-150 keV) in 2.048 sec: 0.268146 ( -0.08316 0.117893 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.41342e-08 ( -1.46293e-08 1.76912e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.06933 ( -3.27051 -2.46074 )
beta : -9.99996 ( 80903.3 80913.3 )
Epeak [keV] : 61.5715 ( -13.5871 36.2351 )
Norm@50keV : 0.260283 ( -0.276481 1.02629 )
------------------------------------------------------------
# Chi-Squared = 50.58 using 59 PHA bins.
# Reduced chi-squared = 0.9196 for 55 degrees of freedom
# Null hypothesis probability = 6.441840e-01
Photon flux (15-150 keV) in 2.048 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Wed Aug 26 02:52:47 EDT 2009