batgrbproduct Analysis for Trigger=360914
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 17:48:52 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger360914/GCN5_download_cron
======================================================================
Trigger: 00360914 Segment: 000
BAT Trigger Time: 272981240.768 [s; MET]
Trigger Stop: 272981241.792 [s; MET]
UTC: 2009-08-26T12:07:15.737160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 298.027799676515 Dec: 50.8074116717141 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.63
Image Trigger?: NO
Rate S/N Ratio: 5.65685424949238 [ if not an image trigger ]
Image S/N Ratio: 5.63
Flight Position: [ source = BAT ]
RA: 298.027799676515 Dec: 50.8074116717141 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 297.939305513865 Dec: 50.779599600447 [deg; J2000]
{ 19h 51m 45.4s , +50d 46' 46.6" }
+/- 3.84355919494673 [arcmin] (estimated 90% radius based on SNR)
+/- 2.17583846301905 [arcmin] (formal 1-sigma fit error)
SNR: 4.44410900495129
Angular difference between Flight and Ground position is 3.748270 arcmin
Partial Coding Fraction: 1.03125 [ 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 0.003433 0.020734 0.014495 0.002031
0.005459 0.005594 0.004976 0.004208 [error]
Peak 0.003433 0.020734 0.014495 0.002031
0.005459 0.005594 0.004976 0.004208 [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 2.46e-09 5.82e-09 1.10e-08 4.99e-08 2.97e-08 6.90e-08 erg/cm2
Error 1.59e-09 2.41e-09 4.43e-09 4.57e-08 1.16e-08 4.84e-08 erg/cm2
Peak flux Power-law 7.68e-02 9.88e-02 9.28e-02 1.54e-01 3.20e-01 4.22e-01 ph/cm2/s
Error 5.03e-02 4.19e-02 3.67e-02 1.28e-01 1.18e-01 1.64e-01 ph/cm2/s
Fluence Cutoff-PL 1.61e-09 7.29e-09 1.19e-08 4.29e-09 2.43e-08 2.50e-08 erg/cm2
Error 1.55e-09 3.46e-09 6.16e-09 3.85e-08 1.20e-08 4.14e-08 erg/cm2
Peak flux Cutoff-PL 4.85e-02 1.20e-01 1.05e-01 2.10e-02 2.92e-01 2.95e-01 ph/cm2/s
Error 4.91e-02 5.86e-02 5.12e-02 1.17e-01 1.64e-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 1.089 0.595 - - 2.76e-03 9.97e-04 54.200 57
CPL -1.398 0.761 67.5 -22.8 4.85e-02 1.32e+00 52.290 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.089 0.595 - - 2.76e-03 9.97e-04 54.200 57
CPL -1.398 0.761 67.5 -22.8 4.85e-02 1.32e+00 52.290 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
297.9393 +50.7796 0.0434 10.1 -24.9 0.0438 4.4 TRIG_00360914
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.768 -8.768 (delta_t = 52.000 [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 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08861 ( -0.62266 0.567247 )
Norm@50keV : 2.76241E-03 ( -0.000998763 0.000996154 )
------------------------------------------------------------
# Chi-Squared = 54.20 using 59 PHA bins.
# Reduced chi-squared = 0.9509 for 57 degrees of freedom
# Null hypothesis probability = 5.806852e-01
Photon flux (15-150 keV) in 1.024 sec: 0.320091 ( -0.117253 0.118353 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96855e-08 ( -1.13991e-08 1.17494e-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: -1.39793 ( 1.4145 2.93664 )
Epeak [keV] : 67.4834 ( -21.6423 -67.2212 )
Norm@50keV : 4.84811E-02 ( -0.0501485 2.5908 )
------------------------------------------------------------
# Chi-Squared = 52.29 using 59 PHA bins.
# Reduced chi-squared = 0.9337 for 56 degrees of freedom
# Null hypothesis probability = 6.162736e-01
Photon flux (15-150 keV) in 1.024 sec: 0.292391 ( -0.110244 0.123662 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.43011e-08 ( -1.0358e-08 1.3708e-08 ) 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 : 4.46385 ( -5.46813 -5.46813 )
beta : -2.14003 ( 2.14003 1.24134 )
Epeak [keV] : 48.8528 ( -48.8528 21.5905 )
Norm@50keV : 2.98325 ( -2.98325 1.30532 )
------------------------------------------------------------
# Chi-Squared = 51.57 using 59 PHA bins.
# Reduced chi-squared = 0.9376 for 55 degrees of freedom
# Null hypothesis probability = 6.065250e-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: 1.08861 ( -0.62266 0.567247 )
Norm@50keV : 2.76241E-03 ( -0.000998763 0.000996154 )
------------------------------------------------------------
# Chi-Squared = 54.20 using 59 PHA bins.
# Reduced chi-squared = 0.9509 for 57 degrees of freedom
# Null hypothesis probability = 5.806852e-01
Photon flux (15-150 keV) in 1.024 sec: 0.320091 ( -0.117253 0.118353 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96855e-08 ( -1.13991e-08 1.17494e-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: -1.39793 ( 1.4145 2.93664 )
Epeak [keV] : 67.4834 ( -21.6423 -67.2212 )
Norm@50keV : 4.84811E-02 ( -0.0501485 2.5908 )
------------------------------------------------------------
# Chi-Squared = 52.29 using 59 PHA bins.
# Reduced chi-squared = 0.9337 for 56 degrees of freedom
# Null hypothesis probability = 6.162736e-01
Photon flux (15-150 keV) in 1.024 sec: 0.292391 ( -0.110244 0.123662 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.43011e-08 ( -1.0358e-08 1.3708e-08 ) 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 : 4.46385 ( -5.46813 -5.46813 )
beta : -2.14003 ( 2.14003 1.24134 )
Epeak [keV] : 48.8528 ( -48.8528 21.5905 )
Norm@50keV : 2.98325 ( -2.98325 1.30532 )
------------------------------------------------------------
# Chi-Squared = 51.57 using 59 PHA bins.
# Reduced chi-squared = 0.9376 for 55 degrees of freedom
# Null hypothesis probability = 6.065250e-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:
Wed Aug 26 18:10:33 EDT 2009