batgrbproduct analysis for trigger=1275005
batgrbproduct Analysis for Trigger=1275005
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 batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.48
Process Start Time (local time): Wed Dec 18 15:04:01 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1275005/batgroup_hand_proc
======================================================================
Trigger: 01275005 Segment: 000
BAT Trigger Time: 756173365.888 [s; MET]
Trigger Stop: 756173378.048 [s; MET]
UTC: 2024-12-18T00:08:51.156520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 185.682435528346 Dec: 29.9908165521575 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.41
Image Trigger?: NO
Rate S/N Ratio: 9.4339811320566 [ if not an image trigger ]
Image S/N Ratio: 8.41
Flight Position: [ source = BAT ]
RA: 185.682435528346 Dec: 29.9908165521575 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 185.686853898287 Dec: 29.9844951310811 [deg; J2000]
{ 12h 22m 44.8s , +29d 59' 04.2" }
+/- 2.10572122381256 [arcmin] (estimated 90% radius based on SNR)
+/- 1.02100021781514 [arcmin] (formal 1-sigma fit error)
SNR: 10.49825532136
Angular difference between Flight and Ground position is 0.443373 arcmin
Partial Coding Fraction: 0.5234375 [ including projection effects ]
Duration
T90: 23.3119999170303 +/- 4.19164109384026
Measured from: -0.0720000267028809
to: 23.2399998903275 [s; relative to TRIGTIME]
T50: 10.1559998989105 +/- 4.21778763515144
Measured from: 5.1360000371933
to: 15.2919999361038 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 16.6399999856949
to: 17.6399999856949 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.82400000095367
to: 26.1599999666214 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.188638 0.272834 0.306808 0.049916
0.044466 0.046835 0.039836 0.032947 [error]
Peak 0.014460 0.031897 0.024618 0.004316
0.008609 0.008903 0.007572 0.005999 [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 6.01e-08 1.24e-07 2.00e-07 7.20e-07 5.53e-07 1.10e-06 erg/cm2
Error 1.76e-08 2.26e-08 3.78e-08 2.93e-07 9.61e-08 3.18e-07 erg/cm2
Peak flux Power-law 1.85e-01 2.00e-01 1.54e-01 1.93e-01 6.12e-01 7.32e-01 ph/cm2/s
Error 1.05e-01 7.53e-02 5.76e-02 1.42e-01 2.13e-01 2.45e-01 ph/cm2/s
Fluence Cutoff-PL 4.97e-08 1.34e-07 2.17e-07 2.56e-07 5.30e-07 6.57e-07 erg/cm2
Error 2.08e-08 2.70e-08 4.51e-08 3.41e-07 9.96e-08 3.69e-07 erg/cm2
Peak flux Cutoff-PL 1.38e-01 2.35e-01 1.76e-01 4.92e-02 5.89e-01 5.99e-01 ph/cm2/s
Error 1.13e-01 9.86e-02 7.69e-02 1.40e-01 2.13e-01 2.46e-01 ph/cm2/s
Fluence Band 5.34e-08 1.30e-07 2.14e-07 3.84e-07 5.48e-07 7.84e-07 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.312 0.265 - - 2.00e-03 3.25e-04 66.440 57
CPL 0.404 1.128 94.9 -32.7 5.39e-03 9.63e-03 63.990 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.381 0.520 - - 5.05e-03 1.68e-03 44.600 57
CPL -0.294 2.911 68.6 -24.4 3.54e-02 2.13e+00 42.790 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: 24.192000 sec.
T50 in the 50-300 keV band: 10.624000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 27.984 -1.824 26.160
T90 23.312 -0.072 23.240
T50 10.156 5.136 15.292
Peak 1.000 16.640 17.640
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
185.6869 +29.9845 0.0182 35.0 -142.0 0.9663 10.5 TRIG_01275005
------------------------------------------
Foreground time interval of the image:
-1.824 26.160 (delta_t = 27.984 [sec])
Background time interval of the image:
-118.387 -1.824 (delta_t = 116.563 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) 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.
- 5) 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.
- 6) 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 -1.824 sec. to 26.160 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31178 ( -0.267906 0.261802 )
Norm@50keV : 2.00472E-03 ( -0.000325492 0.000325492 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.44 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 57 degrees of freedom
# Null hypothesis probability = 1.838118e-01
Photon flux (15-150 keV) in 27.98 sec: 0.239695 ( -0.0405839 0.040786 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.52717e-07 ( -9.57154e-08 9.64991e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.824 sec. to 26.160 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.403655 ( -1.26988 0.986851 )
Epeak [keV] : 94.9308 ( -29.5916 -94.9341 )
Norm@50keV : 5.38902E-03 ( -0.00538862 0.013865 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.99 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 56 degrees of freedom
# Null hypothesis probability = 2.165397e-01
Photon flux (15-150 keV) in 27.98 sec: 0.231668 ( -0.041713 0.041802 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.29754e-07 ( -9.89373e-08 1.00342e-07 ) ergs/cm2
Band function
Time interval is from -1.824 sec. to 26.160 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.471641 ( -6.88672 1.71391 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 97.3332 ( -29.6218 299.095 )
Norm@50keV : 5.07834E-03 ( -0.00315017 0.0142488 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.00 using 59 PHA bins.
# Reduced chi-squared = 1.164 for 55 degrees of freedom
# Null hypothesis probability = 1.899316e-01
Photon flux (15-150 keV) in 27.98 sec: 0.234851 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.48131e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.7174 (-3.33814 4.17253)
R^2/D10^2 : 1.36798E-02 (-0.00681202 0.0131384)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.83 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 57 degrees of freedom
# Null hypothesis probability = 1.354663e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.650e-08 8.542e-09
25- 50 1.261e-07 3.717e-08
50-150 3.237e-07 9.925e-08
15-150 4.763e-07 1.213e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-64.537 -200)
Norm : 1.00999 (-0.16492 0.16492)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.040e-08 3.972e-08
25- 50 1.354e-07 7.701e-08
50-150 2.970e-07 1.689e-07
15-150 5.028e-07 2.815e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.62148 (-2.33487 3.78095)
R1^2/D10^2 : 0.231539 (-0.188569 0.940341)
kT2 [keV] : 24.6034 (-5.76331 11.1754)
R2^2/D10^2 : 4.62445E-03 (-0.0034021 0.00715741)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.663e-08 3.267e-08
25- 50 1.298e-07 6.894e-08
50-150 3.544e-07 2.065e-07
15-150 5.409e-07 2.892e-07
Peak spectrum fit
Power-law model
Time interval is from 16.640 sec. to 17.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38081 ( -0.530866 0.509729 )
Norm@50keV : 5.04520E-03 ( -0.00168406 0.00168377 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.60 using 59 PHA bins.
# Reduced chi-squared = 0.7825 for 57 degrees of freedom
# Null hypothesis probability = 8.837833e-01
Photon flux (15-150 keV) in 1 sec: 0.611839 ( -0.211823 0.21431 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.89404e-08 ( -1.7059e-08 1.73209e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 16.640 sec. to 17.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.294177 ( -3.93329 1.8892 )
Epeak [keV] : 68.5817 ( -19.8503 -68.5848 )
Norm@50keV : 3.54428E-02 ( -0.0354118 4.23046 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.79 using 59 PHA bins.
# Reduced chi-squared = 0.7641 for 56 degrees of freedom
# Null hypothesis probability = 9.028652e-01
Photon flux (15-150 keV) in 1 sec: 0.588696 ( -0.209709 0.215445 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.49957e-08 ( -1.74369e-08 1.82929e-08 ) ergs/cm2
Band function
Time interval is from 16.640 sec. to 17.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.89109 ( -6.40626 -4.89109 )
beta : -1.93415 ( -2.27244 0.775983 )
Epeak [keV] : 36.8663 ( -36.8663 51.251 )
Norm@50keV : 47.5894 ( -15.1267 2.02714e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.12 using 59 PHA bins.
# Reduced chi-squared = 0.7658 for 55 degrees of freedom
# Null hypothesis probability = 8.987517e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.6713e-08 ( -4.6706e-08 -1.73221e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.7123 (-4.89048 7.66607)
R^2/D10^2 : 6.55520E-02 (-0.0655521 0.179247)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.359e-09 2.137e-09
25- 50 1.391e-08 8.625e-09
50-150 2.384e-08 1.588e-08
15-150 4.112e-08 2.550e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 2.59675 (-0.860953 0.861586)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.466e-09 4.082e-09
25- 50 1.244e-08 8.165e-09
50-150 2.728e-08 1.611e-08
15-150 4.618e-08 2.854e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.90361 (-9.8893 -9.8893)
R1^2/D10^2 : 0.193109 (-0.194521 -0.194521)
kT2 [keV] : 25.8358 (-25.6679 -25.6679)
R2^2/D10^2 : 7.14895E-03 (-0.00728562 0.185803)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.659e-09 3.376e-09
25- 50 1.413e-08 1.141e-08
50-150 2.791e-08 1.802e-08
15-150 4.669e-08 2.879e-08
Plot creation:
Wed Dec 18 15:11:17 EST 2024