batgrbproduct Analysis for Trigger=357878
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 20:43:09 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger357878/GCN5_download_cron
======================================================================
Trigger: 00357878 Segment: 000
BAT Trigger Time: 269867282.912 [s; MET]
Trigger Stop: 269867282.976 [s; MET]
UTC: 2009-07-21T11:07:57.982500 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 50.9953275555215 Dec: 11.2872117928667 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.66
Image Trigger?: NO
Rate S/N Ratio: 8.06225774829855 [ if not an image trigger ]
Image S/N Ratio: 5.66
Flight Position: [ source = BAT ]
RA: 50.9953275555215 Dec: 11.2872117928667 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 51.0342196449627 Dec: 11.3764650739041 [deg; J2000]
{ 03h 24m 08.2s , +11d 22' 35.3" }
+/- 4.63986691600873 [arcmin] (estimated 90% radius based on SNR)
+/- 3.30281361307511 [arcmin] (formal 1-sigma fit error)
SNR: 3.39599960793376
Angular difference between Flight and Ground position is 5.823507 arcmin
Partial Coding Fraction: 0.796875 [ including projection effects ]
Duration
T90: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
T50: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0640000104904175 second)
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.000296 -0.001219 0.005266 0.005063
0.001510 0.001521 0.001414 0.001638 [error]
Peak 0.000296 -0.001219 0.005266 0.005063
0.001510 0.001521 0.001414 0.001638 [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 2.52e-11 1.89e-10 1.26e-09 4.40e-08 4.48e-09 4.54e-08 erg/cm2
Error 1.47e-10 4.11e-10 1.22e-09 6.34e-08 3.74e-09 6.41e-08 erg/cm2
Peak flux Power-law 1.21e-02 4.79e-02 1.59e-01 1.77e+00 4.51e-01 1.99e+00 ph/cm2/s
Error 7.31e-02 1.10e-01 1.59e-01 2.36e+00 4.33e-01 2.45e+00 ph/cm2/s
Fluence Cutoff-PL 1.37e-11 1.60e-10 1.32e-09 2.74e-08 4.57e-09 2.44e-08 erg/cm2
Error 1.46e-10 2.46e-10 1.41e-09 7.11e-08 3.81e-09 7.17e-08 erg/cm2
Peak flux Cutoff-PL 1.20e-02 4.79e-02 1.60e-01 1.76e+00 4.52e-01 1.98e+00 ph/cm2/s
Error 7.29e-02 1.10e-01 1.59e-01 2.62e+00 4.33e-01 2.70e+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 -0.733 0.523 - - 2.38e-03 3.60e-03 56.260 57
CPL -1.313 0.513 534.9 0.0 3.11e-03 5.05e-02 56.250 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.733 0.523 - - 2.38e-03 3.60e-03 56.260 57
CPL -1.313 0.513 534.9 0.0 3.11e-03 5.05e-02 56.250 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
51.0342 +11.3765 0.0570 17.0 106.9 0.0098 3.4 TRIG_00357878
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.912 -24.552 (delta_t = 36.360 [sec])
-23.912 -2.912 (delta_t = 21.000 [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: -0.733035 ( 0.733035 1.77954 )
Norm@50keV : 2.37540E-03 ( -0.00237519 0.00482487 )
------------------------------------------------------------
# Chi-Squared = 56.26 using 59 PHA bins.
# Reduced chi-squared = 0.9870 for 57 degrees of freedom
# Null hypothesis probability = 5.028355e-01
Photon flux (15-150 keV) in 0.064 sec: 0.451476 ( -0.451476 0.414913 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.4773e-09 ( -4.47733e-09 3.01136e-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: -1.31284 ( 1.31356 2.34023 )
Epeak [keV] : 534.850 ( -532.327 -532.327 )
Norm@50keV : 3.11439E-03 ( -0.00312354 0.0978882 )
------------------------------------------------------------
# Chi-Squared = 56.25 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 56 degrees of freedom
# Null hypothesis probability = 4.655073e-01
Photon flux (15-150 keV) in 0.064 sec: 0.452320 ( -0.45232 0.413703 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.56841e-09 ( -4.56841e-09 3.05834e-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 : 5.39175E-02 ( -0.0539162 -0.0539162 )
beta : 0.733057 ( -0.733057 -0.733057 )
Epeak [keV] : 16.5081 ( -16.5081 -16.5081 )
Norm@50keV : 4.37640E-03 ( -0.0043763 2146.46 )
------------------------------------------------------------
# Chi-Squared = 56.26 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 55 degrees of freedom
# Null hypothesis probability = 4.275271e-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: -0.733035 ( 0.733035 1.77954 )
Norm@50keV : 2.37540E-03 ( -0.00237519 0.00482487 )
------------------------------------------------------------
# Chi-Squared = 56.26 using 59 PHA bins.
# Reduced chi-squared = 0.9870 for 57 degrees of freedom
# Null hypothesis probability = 5.028355e-01
Photon flux (15-150 keV) in 0.064 sec: 0.451476 ( -0.451476 0.414913 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.4773e-09 ( -4.47733e-09 3.01136e-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: -1.31284 ( 1.31356 2.34023 )
Epeak [keV] : 534.850 ( -532.327 -532.327 )
Norm@50keV : 3.11439E-03 ( -0.00312354 0.0978882 )
------------------------------------------------------------
# Chi-Squared = 56.25 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 56 degrees of freedom
# Null hypothesis probability = 4.655073e-01
Photon flux (15-150 keV) in 0.064 sec: 0.452320 ( -0.45232 0.413703 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.56841e-09 ( -4.56841e-09 3.05834e-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 : 5.39175E-02 ( -0.0539162 -0.0539162 )
beta : 0.733057 ( -0.733057 -0.733057 )
Epeak [keV] : 16.5081 ( -16.5081 -16.5081 )
Norm@50keV : 4.37640E-03 ( -0.0043763 2146.46 )
------------------------------------------------------------
# Chi-Squared = 56.26 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 55 degrees of freedom
# Null hypothesis probability = 4.275271e-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:
Tue Jul 21 20:57:12 EDT 2009