batgrbproduct Analysis for Trigger=357898
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): Tue Jul 21 20:03:37 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger357898/GCN5_download_cron
======================================================================
Trigger: 00357898 Segment: 000
BAT Trigger Time: 269897162.304 [s; MET]
Trigger Stop: 269897163.328 [s; MET]
UTC: 2009-07-21T19:25:57.373540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 171.957273242732 Dec: 30.035313937764 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.67
Image Trigger?: NO
Rate S/N Ratio: 9.8488578017961 [ if not an image trigger ]
Image S/N Ratio: 5.67
Flight Position: [ source = BAT ]
RA: 171.957273242732 Dec: 30.035313937764 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 171.938883963589 Dec: 30.0113371139245 [deg; J2000]
{ 11h 27m 45.3s , +30d 00' 40.8" }
+/- 4.22094208012496 [arcmin] (estimated 90% radius based on SNR)
+/- 3.12240723577447 [arcmin] (formal 1-sigma fit error)
SNR: 3.88755360293681
Angular difference between Flight and Ground position is 1.726909 arcmin
Partial Coding Fraction: 0.421875 [ 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 0.001215 -0.011876 0.030850 0.021207
0.008244 0.008652 0.007877 0.007668 [error]
Peak 0.001215 -0.011876 0.030850 0.021207
0.008244 0.008652 0.007877 0.007668 [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 3.57e-10 2.48e-09 1.49e-08 4.36e-07 5.08e-08 4.68e-07 erg/cm2
Error 7.17e-10 2.91e-09 1.12e-08 5.01e-07 2.45e-08 5.06e-07 erg/cm2
Peak flux Power-law 1.12e-02 3.98e-02 1.19e-01 1.11e+00 3.29e-01 1.25e+00 ph/cm2/s
Error 2.20e-02 4.76e-02 9.06e-02 1.18e+00 2.44e-01 9.02e-01 ph/cm2/s
Fluence Cutoff-PL 1.38e-10 2.10e-09 1.86e-08 1.53e-07 1.47e-07 0.00e+00 erg/cm2
Error 4.12e-10 1.84e-09 9.08e-09 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.13e-03 3.25e-02 1.47e-01 4.04e-01 3.50e-01 5.96e-01 ph/cm2/s
Error 1.33e-02 2.78e-02 7.49e-02 8.36e-01 1.36e-01 8.12e-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 -0.577 1.139 - - 1.88e-03 1.82e-03 53.910 57
CPL -4.982 0.000 133.6 49.2 2.36e-02 2.37e-02 50.880 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.577 1.139 - - 1.88e-03 1.82e-03 53.910 57
CPL -4.982 0.000 133.6 49.2 2.36e-02 2.37e-02 50.880 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
171.9389 +30.0113 0.0495 33.6 -58.7 0.0624 3.9 TRIG_00357898
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-19.103 -10.304 (delta_t = 8.799 [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: -0.576967 ( -1.39363 0.885322 )
Norm@50keV : 1.87653E-03 ( -0.00188032 0.00175312 )
------------------------------------------------------------
# Chi-Squared = 53.91 using 59 PHA bins.
# Reduced chi-squared = 0.9457 for 57 degrees of freedom
# Null hypothesis probability = 5.918369e-01
Photon flux (15-150 keV) in 1.024 sec: 0.329002 ( -0.329002 0.159581 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.08019e-08 ( -2.87771e-08 2.0194e-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: -4.98229 ( )
Epeak [keV] : 133.585 ( -32.7189 65.6407 )
Norm@50keV : 2.36261E-02 ( -0.0236261 0.0236748 )
------------------------------------------------------------
# Chi-Squared = 50.88 using 59 PHA bins.
# Reduced chi-squared = 0.9086 for 56 degrees of freedom
# Null hypothesis probability = 6.684146e-01
Photon flux (15-150 keV) in 1.024 sec: 0.350422 ( -0.134208 0.1385 ) 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 : 0.224703 ( -0.150465 -0.150465 )
beta : 0.612649 ( -0.907219 1.37388 )
Epeak [keV] : 24.0952 ( -24.6485 -24.6485 )
Norm@50keV : 2.86138E-03 ( -0.00289374 22350.7 )
------------------------------------------------------------
# Chi-Squared = 53.91 using 59 PHA bins.
# Reduced chi-squared = 0.9802 for 55 degrees of freedom
# Null hypothesis probability = 5.162736e-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: -0.576967 ( -1.39363 0.885322 )
Norm@50keV : 1.87653E-03 ( -0.00188032 0.00175312 )
------------------------------------------------------------
# Chi-Squared = 53.91 using 59 PHA bins.
# Reduced chi-squared = 0.9457 for 57 degrees of freedom
# Null hypothesis probability = 5.918369e-01
Photon flux (15-150 keV) in 1.024 sec: 0.329002 ( -0.329002 0.159581 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.08019e-08 ( -2.87771e-08 2.0194e-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: -4.98229 ( )
Epeak [keV] : 133.585 ( -32.7189 65.6407 )
Norm@50keV : 2.36261E-02 ( -0.0236261 0.0236748 )
------------------------------------------------------------
# Chi-Squared = 50.88 using 59 PHA bins.
# Reduced chi-squared = 0.9086 for 56 degrees of freedom
# Null hypothesis probability = 6.684146e-01
Photon flux (15-150 keV) in 1.024 sec: 0.350422 ( -0.134208 0.1385 ) 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 : 0.224703 ( -0.150465 -0.150465 )
beta : 0.612649 ( -0.907219 1.37388 )
Epeak [keV] : 24.0952 ( -24.6485 -24.6485 )
Norm@50keV : 2.86138E-03 ( -0.00289374 22350.7 )
------------------------------------------------------------
# Chi-Squared = 53.91 using 59 PHA bins.
# Reduced chi-squared = 0.9802 for 55 degrees of freedom
# Null hypothesis probability = 5.162736e-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:
Tue Jul 21 20:12:26 EDT 2009