batgrbproduct Analysis for Trigger=360495
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): Fri Aug 21 05:53:56 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger360495/GCN5_download_cron
======================================================================
Trigger: 00360495 Segment: 000
BAT Trigger Time: 272463187.008 [s; MET]
Trigger Stop: 272463188.032 [s; MET]
UTC: 2009-08-20T12:13:01.994140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 105.87944900398 Dec: -21.6944745212482 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.78
Image Trigger?: NO
Rate S/N Ratio: 30.4630924234556 [ if not an image trigger ]
Image S/N Ratio: 5.78
Flight Position: [ source = BAT ]
RA: 105.87944900398 Dec: -21.6944745212482 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 105.848047916988 Dec: -21.6637986404958 [deg; J2000]
{ 07h 03m 23.5s , -21d 39' 49.7" }
+/- 5.43459972659186 [arcmin] (estimated 90% radius based on SNR)
+/- 4.18776801723866 [arcmin] (formal 1-sigma fit error)
SNR: 2.70943667320382
Angular difference between Flight and Ground position is 2.540263 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: -2.98023223876953e-08
to: 1.02399995923042 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.015573 -0.003991 0.023486 0.027153
0.007273 0.008618 0.008213 0.009872 [error]
Peak -0.015573 -0.003991 0.023486 0.027153
0.007273 0.008618 0.008213 0.009872 [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 1.01e-10 1.00e-09 8.97e-09 5.18e-07 3.63e-08 0.00e+00 erg/cm2
Error 3.54e-10 1.70e-09 8.22e-09 4.99e-07 2.37e-08 0.00e+00 erg/cm2
Peak flux Power-law 2.99e-03 1.56e-02 6.99e-02 1.26e+00 2.15e-01 0.00e+00 ph/cm2/s
Error 1.08e-02 2.76e-02 6.59e-02 1.17e+00 1.52e-01 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 1.59e-03 1.37e-02 7.92e-02 0.00e+00 6.13e-01 0.00e+00 ph/cm2/s
Error 1.02e-02 2.65e-02 7.85e-02 0.00e+00 0.00e+00 0.00e+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 -1.193 0.000 - - 8.42e-04 1.15e-03 65.690 57
CPL -3.257 0.000 261.0 0.0 1.82e-03 3.24e-02 65.400 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -1.193 0.000 - - 8.42e-04 1.15e-03 65.690 57
CPL -3.257 0.000 261.0 0.0 1.82e-03 3.24e-02 65.400 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 -0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
105.8480 -21.6638 0.0708 16.7 20.6 0.0477 2.7 TRIG_00360495
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-28.907 -11.008 (delta_t = 17.899 [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 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.19341 ( )
Norm@50keV : 8.42001E-04 ( -0.000847399 0.00145955 )
------------------------------------------------------------
# Chi-Squared = 65.69 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 57 degrees of freedom
# Null hypothesis probability = 2.011670e-01
Photon flux (15-150 keV) in 1.024 sec: 0.214730 ( -0.153456 0.151304 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.63383e-08 ( -2.49994e-08 2.24717e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.25740 ( )
Epeak [keV] : 261.004 ( )
Norm@50keV : 1.81619E-03 ( -0.00181386 0.0630401 )
------------------------------------------------------------
# Chi-Squared = 65.40 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 56 degrees of freedom
# Null hypothesis probability = 1.827510e-01
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.653180 ( -0.656871 -0.656871 )
beta : 1.15525 ( -1.25978 0.922187 )
Epeak [keV] : 10.5113 ( -10.4969 -10.4969 )
Norm@50keV : 3.02902E-03 ( 210.559 -0.00301764 )
------------------------------------------------------------
# Chi-Squared = 65.69 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 55 degrees of freedom
# Null hypothesis probability = 1.533515e-01
Photon flux (15-150 keV) in 1.024 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 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.19341 ( )
Norm@50keV : 8.42001E-04 ( -0.000847399 0.00145955 )
------------------------------------------------------------
# Chi-Squared = 65.69 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 57 degrees of freedom
# Null hypothesis probability = 2.011670e-01
Photon flux (15-150 keV) in 1.024 sec: 0.214730 ( -0.153456 0.151304 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.63383e-08 ( -2.49994e-08 2.24717e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.25740 ( )
Epeak [keV] : 261.004 ( )
Norm@50keV : 1.81619E-03 ( -0.00181386 0.0630401 )
------------------------------------------------------------
# Chi-Squared = 65.40 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 56 degrees of freedom
# Null hypothesis probability = 1.827510e-01
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.653180 ( -0.656871 -0.656871 )
beta : 1.15525 ( -1.25978 0.922187 )
Epeak [keV] : 10.5113 ( -10.4969 -10.4969 )
Norm@50keV : 3.02902E-03 ( 210.559 -0.00301764 )
------------------------------------------------------------
# Chi-Squared = 65.69 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 55 degrees of freedom
# Null hypothesis probability = 1.533515e-01
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Fri Aug 21 06:10:30 EDT 2009