batgrbproduct Analysis for Trigger=276045
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 v2.41
Process Start Time (local time): Thu Dec 13 17:48:38 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger276045/GCN5_download_cron
======================================================================
Trigger: 00276045 Segment: 000
BAT Trigger Time: 198588062.688 [s; MET]
Trigger Stop: 198588063.072 [s; MET]
UTC: 2007-04-18T11:21:00.789900 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 228.503949739379 Dec: 51.2262702772327 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.61
Image Trigger?: NO
Rate S/N Ratio: 10.3923048454133 [ if not an image trigger ]
Image S/N Ratio: 6.61
Flight Position: [ source = BAT ]
RA: 228.503949739379 Dec: 51.2262702772327 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 228.755077695506 Dec: 51.0180437075928 [deg; J2000]
{ 15h 15m 01.2s , +51d 01' 05.0" }
+/- 25.6738570680574 [arcmin] (estimated 90% radius based on SNR)
+/- 33.6997670287709 [arcmin] (formal 1-sigma fit error)
SNR: 0.294821830595774
RA = 15h 15m 1.2s (228.755078 deg.)
Dec = 51d 1' 5" (51.018044 deg.)
Angular difference between Flight and Ground position is 15.669456 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
T50: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.38400000333786 second)
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.002081 -0.000981 -0.000083 0.004668
0.003296 0.003336 0.002950 0.002808 [error]
Peak -0.002081 -0.000981 -0.000083 0.004668
0.003296 0.003336 0.002950 0.002808 [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 3.63e-12 4.11e-11 4.33e-10 3.39e-08 1.90e-09 0.00e+00 erg/cm2
Error 4.96e-10 6.32e-10 1.41e-09 6.96e-08 4.30e-09 0.00e+00 erg/cm2
Peak flux Power-law 3.12e-04 1.76e-03 8.91e-03 2.15e-01 2.90e-02 0.00e+00 ph/cm2/s
Error 4.38e-02 2.89e-02 3.08e-02 4.35e-01 9.11e-02 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 1.83e-12 2.53e-11 3.90e-10 7.16e-08 1.87e-09 0.00e+00 erg/cm2
Error 6.23e-10 1.26e-07 4.41e-09 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 3.65e-04 1.38e-03 8.43e-03 2.42e-01 2.87e-02 0.00e+00 ph/cm2/s
Error 2.88e-02 3.11e-02 4.82e-01 9.08e-02 0.00e+00 0.00e+00 ph/cm2/s
Fluence Band 2.19e-12 9.83e-12 8.69e-11 1.56e-07 1.05e-09 0.00e+00 erg/cm2
Error 1.75e-09 2.57e-07 4.43e-09 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 4.52e-05 5.08e-04 2.72e-03 8.76e-01 1.37e-02 0.00e+00 ph/cm2/s
Error 1.44e+00 8.75e-02 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 1.500 6.500 - - 0.00e+00 8.42e-04 53.763 57
CPL 1.000 6.500 50.0 5000.0 0.00e+00 5.00e+23 53.763 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.500 6.500 - - 0.00e+00 8.42e-04 53.763 57
CPL 1.000 6.500 50.0 5000.0 0.00e+00 5.00e+23 53.763 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 0.384 0.000 0.384
T90 0.384 0.000 0.384
T50 0.384 0.000 0.384
Peak 0.384 0.000 0.384
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
228.7551 +51.0180 0.6678 34.2 -14.5 0.0018 0.3 TRIG_00276045
------------------------------------------
Foreground time interval of the image:
-0.032 0.352 (delta_t = 0.384 [sec])
Background time interval of the image:
-118.720 -6.720 (delta_t = 112.000 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -4.50000 8.50000 )
Norm@50keV : 0.00000 ( 0.00000 1.684061E-03) )
------------------------------------------------------------
Chi-Squared = 53.76252 using 59 PHA bins.
Reduced chi-squared = 0.9432020 for 57 degrees of freedom
Null hypothesis probability = 0.597
Photon flux (15-150 keV) in 0.3840 sec: 2.903437E-02 ( -0.0290344 0.153175 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.90359e-09 ( -1.90359e-09 6.70502e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( -4.00000 9.00000 )
Epeak [keV] : 50.0000 ( -49.9900 9950.00 )
Norm@50keV : 0.00000 ( 0.00000 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 53.76252 using 59 PHA bins.
Reduced chi-squared = 0.9600449 for 56 degrees of freedom
Null hypothesis probability = 0.560
Photon flux (15-150 keV) in 0.3840 sec: 2.866750E-02 ( -0.0286675 0.15288 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87112e-09 ( -1.87112e-09 6.94756e-09 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.983950 ( -9.01605 5.98395 )
beta : -2.50000 ( -7.50000 12.5000 )
Epeak [keV] : 80.0000 ( -79.9000 9920.00 )
Norm@50keV : 0.00000 ( -1.644992E-02 8.689456E-02) )
------------------------------------------------------------
Chi-Squared = 53.76252 using 59 PHA bins.
Reduced chi-squared = 0.9775003 for 55 degrees of freedom
Null hypothesis probability = 0.522
Photon flux (15-150 keV) in 0.3840 sec: 1.367009E-02 ( -0.0136701 0.161259 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05494e-09 ( -1.05494e-09 7.80465e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -4.50000 8.50000 )
Norm@50keV : 0.00000 ( 0.00000 1.684061E-03) )
------------------------------------------------------------
Chi-Squared = 53.76252 using 59 PHA bins.
Reduced chi-squared = 0.9432020 for 57 degrees of freedom
Null hypothesis probability = 0.597
Photon flux (15-150 keV) in 0.3840 sec: 2.903437E-02 ( -0.0290344 0.153175 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.90359e-09 ( -1.90359e-09 6.70502e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( -4.00000 9.00000 )
Epeak [keV] : 50.0000 ( -49.9900 9950.00 )
Norm@50keV : 0.00000 ( 0.00000 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 53.76252 using 59 PHA bins.
Reduced chi-squared = 0.9600449 for 56 degrees of freedom
Null hypothesis probability = 0.560
Photon flux (15-150 keV) in 0.3840 sec: 2.866750E-02 ( -0.0286675 0.15288 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87112e-09 ( -1.87112e-09 6.94756e-09 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.983950 ( -9.01605 5.98395 )
beta : -2.50000 ( -7.50000 12.5000 )
Epeak [keV] : 80.0000 ( -79.9000 9920.00 )
Norm@50keV : 0.00000 ( -1.644992E-02 8.689456E-02) )
------------------------------------------------------------
Chi-Squared = 53.76252 using 59 PHA bins.
Reduced chi-squared = 0.9775003 for 55 degrees of freedom
Null hypothesis probability = 0.522
Photon flux (15-150 keV) in 0.3840 sec: 1.367009E-02 ( -0.0136701 0.161259 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05494e-09 ( -1.05494e-09 7.80465e-09 ) ergs/cm2
Plot creation:
Thu Dec 13 17:56:44 EST 2007