batgrbproduct Analysis for Trigger=357881
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 20:19:28 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger357881/GCN5_download_cron
======================================================================
Trigger: 00357881 Segment: 000
BAT Trigger Time: 269874110.904 [s; MET]
Trigger Stop: 269874110.968 [s; MET]
UTC: 2009-07-21T13:01:45.974280 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 215.583489698896 Dec: -52.8035573189944 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.94
Image Trigger?: NO
Rate S/N Ratio: 8.54400374531753 [ if not an image trigger ]
Image S/N Ratio: 5.94
Flight Position: [ source = BAT ]
RA: 215.583489698896 Dec: -52.8035573189944 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 215.760414056219 Dec: -52.6624437255227 [deg; J2000]
{ 14h 23m 02.5s , -52d 39' 44.8" }
+/- 4.47597282849255 [arcmin] (estimated 90% radius based on SNR)
+/- 3.5833125285401 [arcmin] (formal 1-sigma fit error)
SNR: 3.57502577986331
Angular difference between Flight and Ground position is 10.630417 arcmin
Partial Coding Fraction: 1 [ 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 -0.002690 0.000209 0.002628 0.006954
0.001350 0.001327 0.001352 0.001401 [error]
Peak -0.002690 0.000209 0.002628 0.006954
0.001350 0.001327 0.001352 0.001401 [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 6.56e-12 7.39e-11 7.55e-10 5.51e-08 3.26e-09 0.00e+00 erg/cm2
Error 4.06e-11 1.84e-10 8.61e-10 5.28e-08 3.04e-09 0.00e+00 erg/cm2
Peak flux Power-law 3.13e-03 1.83e-02 9.36e-02 2.10e+00 3.01e-01 0.00e+00 ph/cm2/s
Error 1.99e-02 4.77e-02 1.10e-01 1.98e+00 3.04e-01 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 1.85e-12 3.87e-11 6.71e-10 5.74e-08 3.39e-09 0.00e+00 erg/cm2
Error 3.39e-11 1.66e-10 9.33e-10 8.83e-08 3.23e-09 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.52e-03 1.61e-02 8.94e-02 2.29e+00 2.96e-01 0.00e+00 ph/cm2/s
Error 1.90e-02 4.65e-02 1.04e-01 2.18e+00 3.02e-01 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 -1.301 0.000 - - 1.14e-03 1.96e-03 67.070 57
CPL -4.500 0.000 260.7 0.0 1.75e-03 1.42e-02 66.460 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -1.301 0.000 - - 1.14e-03 1.96e-03 67.070 57
CPL -4.500 0.000 260.7 0.0 1.75e-03 1.42e-02 66.460 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
215.7604 -52.6624 0.0541 11.8 156.8 0.0094 3.6 TRIG_00357881
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.904 -6.904 (delta_t = 54.000 [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: -1.30087 ( )
Norm@50keV : 1.14059E-03 ( -0.00112484 0.00279469 )
------------------------------------------------------------
# Chi-Squared = 67.07 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 57 degrees of freedom
# Null hypothesis probability = 1.700006e-01
Photon flux (15-150 keV) in 0.064 sec: 0.300791 ( -0.300791 0.307105 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.25978e-09 ( -3.25951e-09 2.82235e-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: -4.49998 ( )
Epeak [keV] : 260.705 ( )
Norm@50keV : 1.74848E-03 ( -0.00174677 0.0266174 )
------------------------------------------------------------
# Chi-Squared = 66.46 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 56 degrees of freedom
# Null hypothesis probability = 1.597932e-01
Photon flux (15-150 keV) in 0.064 sec: 0.296118 ( -0.296118 0.306943 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.38637e-09 ( -3.38637e-09 3.06886e-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 : 4.38550 ( -0.670183 -0.670183 )
beta : -0.821645 ( 0.785243 3.01199 )
Epeak [keV] : 231.481 ( -231.818 6164.05 )
Norm@50keV : 2.73038E-03 ( -0.00270737 308.161 )
------------------------------------------------------------
# Chi-Squared = 66.60 using 59 PHA bins.
# Reduced chi-squared = 1.211 for 55 degrees of freedom
# Null hypothesis probability = 1.358736e-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: -1.30087 ( )
Norm@50keV : 1.14059E-03 ( -0.00112484 0.00279469 )
------------------------------------------------------------
# Chi-Squared = 67.07 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 57 degrees of freedom
# Null hypothesis probability = 1.700006e-01
Photon flux (15-150 keV) in 0.064 sec: 0.300791 ( -0.300791 0.307105 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.25978e-09 ( -3.25951e-09 2.82235e-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: -4.49998 ( )
Epeak [keV] : 260.705 ( )
Norm@50keV : 1.74848E-03 ( -0.00174677 0.0266174 )
------------------------------------------------------------
# Chi-Squared = 66.46 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 56 degrees of freedom
# Null hypothesis probability = 1.597932e-01
Photon flux (15-150 keV) in 0.064 sec: 0.296118 ( -0.296118 0.306943 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.38637e-09 ( -3.38637e-09 3.06886e-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 : 4.38550 ( -0.670183 -0.670183 )
beta : -0.900114 ( 0.849742 3.07625 )
Epeak [keV] : 231.040 ( -231.379 762.908 )
Norm@50keV : 2.75033E-03 ( -0.00272631 0.0507515 )
------------------------------------------------------------
# Chi-Squared = 66.60 using 59 PHA bins.
# Reduced chi-squared = 1.211 for 55 degrees of freedom
# Null hypothesis probability = 1.358247e-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 20:36:56 EDT 2009