Click here for the BAT GCN circular template
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
272.1584 -20.3993 0.0139 6.6 12.1 0.0531 13.8 TRIG_00549841
------------------------------------------
Foreground time interval of the image:
-0.024 0.040 (delta_t = 0.064 [sec])
Background time interval of the image:
-239.092 -55.562 (delta_t = 183.530 [sec])
-54.092 -50.462 (delta_t = 3.630 [sec])
-49.092 -41.002 (delta_t = 8.090 [sec])
-40.092 -39.512 (delta_t = 0.580 [sec])
-38.092 -37.605 (delta_t = 0.487 [sec])
-36.092 -35.502 (delta_t = 0.590 [sec])
-32.092 -31.802 (delta_t = 0.290 [sec])
-31.092 -30.416 (delta_t = 0.676 [sec])
-12.092 -11.832 (delta_t = 0.260 [sec])
-10.092 -0.024 (delta_t = 10.068 [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
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000
8 ms binning
From T100_start-3 s to T100_start+3 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000
2 ms binning
From T100_start-1 s to T100_start+1 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
The mask-weighted light curves based on cleaned DPHs
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 -0.024 sec. to 0.040 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.42672 ( -0.231375 0.258195 )
Norm@50keV : 3.35152E-02 ( -0.00641031 0.00624014 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.54 using 59 PHA bins.
# Reduced chi-squared = 0.8692 for 57 degrees of freedom
# Null hypothesis probability = 7.480501e-01
Photon flux (15-150 keV) in 0.064 sec: 6.29948 ( -0.822051 0.822161 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10536e-08 ( -3.17776e-09 3.23061e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 0.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22956 ( -1.40299 1.05888 )
Epeak [keV] : 25.1490 ( )
Norm@50keV : 0.178565 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.66 using 59 PHA bins.
# Reduced chi-squared = 0.8153 for 56 degrees of freedom
# Null hypothesis probability = 8.366727e-01
Photon flux (15-150 keV) in 0.064 sec: 6.20785 ( -0.82736 0.82699 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98798e-08 ( -3.1593e-09 3.344e-09 ) ergs/cm2
Band function
Time interval is from -0.024 sec. to 0.040 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22955 ( -0.446502 1.59234 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 25.1435 ( -6.03131 10.3417 )
Norm@50keV : 0.178553 ( -0.0229914 1.16863 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.66 using 59 PHA bins.
# Reduced chi-squared = 0.8301 for 55 degrees of freedom
# Null hypothesis probability = 8.112115e-01
Photon flux (15-150 keV) in 0.064 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.24221 (-1.12595 1.26153)
R^2/D10^2 : 6.30444 (-2.77895 5.14481)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.13 using 59 PHA bins.
# Reduced chi-squared = 0.9497 for 57 degrees of freedom
# Null hypothesis probability = 5.833977e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.063e-09 1.140e-09
25- 50 9.326e-09 1.814e-09
50-150 2.699e-09 1.085e-09
15-150 1.709e-08 3.037e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 37.6337 (-9.50592 13.573)
Norm : 43.3383 (-9.5398 12.709)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.70 using 59 PHA bins.
# Reduced chi-squared = 0.8017 for 57 degrees of freedom
# Null hypothesis probability = 8.587153e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.234e-09 1.036e-09
25- 50 7.982e-09 1.222e-09
50-150 5.769e-09 2.257e-09
15-150 1.998e-08 3.206e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.72201 (-1.90235 2.7431)
R1^2/D10^2 : 95.9406 (-83.5792 6186.79)
kT2 [keV] : 11.2737 (-2.62541 6.75368)
R2^2/D10^2 : 1.37580 (-1.25337 1.97923)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.51 using 59 PHA bins.
# Reduced chi-squared = 0.8275 for 55 degrees of freedom
# Null hypothesis probability = 8.154391e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.245e-09 3.322e-09
25- 50 7.992e-09 4.294e-09
50-150 5.020e-09 3.040e-09
15-150 1.926e-08 9.926e-09
Peak spectrum fit
Power-law model
Time interval is from -0.490 sec. to 0.510 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80235 ( -0.491156 0.539065 )
Norm@50keV : 3.32980E-03 ( -0.00111994 0.00107329 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.59 using 59 PHA bins.
# Reduced chi-squared = 0.9051 for 57 degrees of freedom
# Null hypothesis probability = 6.775438e-01
Photon flux (15-150 keV) in 1 sec: 0.459259 ( -0.131023 0.131171 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.0652e-08 ( -1.00034e-08 1.05263e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.490 sec. to 0.510 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02664 ( )
Epeak [keV] : 56.6240 ( )
Norm@50keV : 8.86461E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.97 using 59 PHA bins.
# Reduced chi-squared = 0.9102 for 56 degrees of freedom
# Null hypothesis probability = 6.650898e-01
Photon flux (15-150 keV) in 1 sec: 0.446773 ( -0.132718 0.132539 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.88112e-08 ( -9.9399e-09 1.11404e-08 ) ergs/cm2
Band function
Time interval is from -0.490 sec. to 0.510 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04518 ( -1.68463 2.19285 )
beta : -10.0000 ( 10 1.42109e-14 )
Epeak [keV] : 57.0423 ( -42.1758 -57.0423 )
Norm@50keV : 8.64834E-03 ( -0.00864837 0.137333 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.97 using 59 PHA bins.
# Reduced chi-squared = 0.9268 for 55 degrees of freedom
# Null hypothesis probability = 6.291565e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.9672 (-4.90892 6.11833)
R^2/D10^2 : 8.29361E-02 (-0.0813695 0.386997)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.23 using 59 PHA bins.
# Reduced chi-squared = 0.9514 for 57 degrees of freedom
# Null hypothesis probability = 5.795662e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.958e-09 1.860e-09
25- 50 1.016e-08 6.225e-09
50-150 1.078e-08 7.880e-09
15-150 2.390e-08 1.487e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 95.4162 (-55.8386 -95.4204)
Norm : 2.06790 (-0.679542 1.09365)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.04 using 59 PHA bins.
# Reduced chi-squared = 0.8955 for 57 degrees of freedom
# Null hypothesis probability = 6.969684e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.403e-09 3.311e-09
25- 50 9.253e-09 5.595e-09
50-150 1.459e-08 1.144e-08
15-150 2.925e-08 1.986e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.13030 (-2.31576 3.81539)
R1^2/D10^2 : 1.72494 (-1.59287 5.5576)
kT2 [keV] : 19.4080 (-6.96653 16.7281)
R2^2/D10^2 : 1.52752E-02 (-0.0138146 0.0695686)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.46 using 59 PHA bins.
# Reduced chi-squared = 0.8992 for 55 degrees of freedom
# Null hypothesis probability = 6.855865e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.767e-09 3.502e-09
25- 50 8.708e-09 4.643e-09
50-150 1.537e-08 9.490e-09
15-150 2.985e-08 1.640e-08
Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)
Power-law model
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.42672 ( -0.231375 0.258195 )
Norm@50keV : 3.35152E-02 ( -0.00641031 0.00624014 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.54 using 59 PHA bins.
# Reduced chi-squared = 0.8692 for 57 degrees of freedom
# Null hypothesis probability = 7.480501e-01
Photon flux (15-150 keV) in 0.064 sec: 6.29948 ( -0.822051 0.822161 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10536e-08 ( -3.17776e-09 3.23061e-09 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22956 ( -1.40299 1.05888 )
Epeak [keV] : 25.1490 ( )
Norm@50keV : 0.178565 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.66 using 59 PHA bins.
# Reduced chi-squared = 0.8153 for 56 degrees of freedom
# Null hypothesis probability = 8.366727e-01
Photon flux (15-150 keV) in 0.064 sec: 6.20785 ( -0.82736 0.82699 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98798e-08 ( -3.1593e-09 3.344e-09 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22955 ( -0.27304 1.59234 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 25.1435 ( -6.03131 10.3417 )
Norm@50keV : 0.178553 ( -0.0229914 1.16863 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.66 using 59 PHA bins.
# Reduced chi-squared = 0.8301 for 55 degrees of freedom
# Null hypothesis probability = 8.112115e-01
Photon flux (15-150 keV) in 0.064 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 6.9287e-09
S(50-100 keV) = 5.15457e-09
T90 vs. Hardness ratio plot
T90 = 0.0519999861717224 sec.
Hardness ratio (energy fluence ratio) = 0.743945
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.02755
Count Ratio (50-100 keV) / (15-25 keV) = 0.329346
Mask shadow pattern
IMX = 1.128989742401474E-01, IMY = -2.419813773516796E-02
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.032000
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image:
-239.092000 -55.562000
-54.092000 -50.462000
-49.092000 -41.002000
-40.092000 -39.512000
-38.092000 -37.604900
-36.092000 -35.502000
-32.092000 -31.802000
-31.092000 -30.416200
-12.092000 -11.832000
-10.092000 -0.024000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9844 -15.6531 0.5 28.0 80.3 7.4469 22.3 0.8 Sco X-1
254.5104 35.4345 11.3 52.8 157.5 -1.1631 -1.0 6.1 Her X-1
255.9840 -37.8411 26.5 28.6 27.9 0.1042 0.4 0.2 4U 1700-377
256.3132 -36.3058 5.1 27.3 29.5 0.5293 2.2 9.2 GX 349+2
262.9029 -24.5842 27.7 14.8 40.3 0.0775 0.4 11.3 GX 1+4
264.6391 -44.3861 5.7 31.4 10.2 0.4884 2.0 5.9 4U 1735-44
268.3442 -1.4802 3.1 13.7 153.1 0.6555 3.7 2.2 SW J1753.5-0127
270.3141 -24.9803 7.4 11.5 14.1 0.3074 1.6 6.2 GX 5-1
270.3837 -25.6574 4.5 12.1 12.9 0.5221 2.6 6.8 GRS 1758-258
274.0266 -14.0049 1.5 0.1 -113.4 1.4633 7.7 2.2 GX 17+2
275.8006 -30.3595 6.3 16.4 -8.3 0.3417 1.8 6.5 H1820-303
284.8735 -24.9425 7.2 15.0 -44.3 0.3154 1.6 8.9 HT1900.1-2455
288.7826 10.9316 1.3 29.0 -151.4 1.9814 9.2 1.2 GRS 1915+105
299.6315 35.2122 2.3 54.9 -157.0 3.3770 5.0 2.1 Cyg X-1
262.9126 -33.8730 2.0 22.2 22.2 1.0938 5.8 4.5 GX 354-0
232.9172 -43.2538 2.5 45.6 39.3 2.8226 4.6 ------ UNKNOWN
271.7201 40.1030 2.8 54.2 175.3 3.3917 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.024000 0.040000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.8939 -15.5256 4.1 28.1 80.6 0.0189 2.8 8.5 Sco X-1
254.6115 35.4614 7.5 52.8 157.6 0.0336 1.5 10.4 Her X-1
256.1401 -37.9637 4.1 28.7 27.5 -0.0135 -2.8 10.2 4U 1700-377
256.2661 -36.4058 15.1 27.4 29.5 -0.0037 -0.8 8.2 GX 349+2
263.1163 -24.7671 92.5 14.8 39.3 0.0005 0.1 6.0 GX 1+4
264.6104 -44.5226 9.7 31.5 10.2 -0.0056 -1.2 7.2 4U 1735-44
268.3068 -1.3004 6.3 13.9 153.3 0.0075 1.8 9.8 SW J1753.5-0127
270.1211 -25.0840 9.2 11.6 14.8 0.0051 1.3 8.9 GX 5-1
270.2634 -25.5903 6.2 12.1 13.4 -0.0076 -1.9 9.4 GRS 1758-258
274.1660 -13.8933 5.1 0.3 -125.9 -0.0089 -2.3 12.7 GX 17+2
276.0985 -30.2210 0.0 16.3 -9.3 -0.0004 -0.1 12.6 H1820-303
285.0324 -24.9180 360.2 15.1 -44.8 -0.0001 -0.0 0.2 HT1900.1-2455
288.8728 10.9438 11.0 29.0 -151.2 0.0047 1.1 4.4 GRS 1915+105
299.5894 35.2006 18.4 54.9 -157.0 0.0090 0.6 0.1 Cyg X-1
262.9873 -33.9689 6.6 22.3 21.9 -0.0077 -1.7 8.1 GX 354-0
241.0200 -18.3534 2.2 31.9 75.1 0.0377 5.2 ------ UNKNOWN
272.1584 -20.3992 0.8 6.6 12.1 0.0531 13.8 ------ UNKNOWN
279.3758 -3.4402 2.6 11.9 -155.3 0.0161 4.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
34.808600 963.008000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9882 -15.6362 0.4 26.3 95.7 29.6531 31.7 0.6 Sco X-1
256.1579 -37.9195 10.4 22.4 34.7 -0.6699 -1.1 9.3 4U 1700-377
256.4069 -36.4402 2.8 21.1 37.1 2.5150 4.1 1.7 GX 349+2
263.0048 -24.7380 2700.0 9.5 60.9 0.0019 0.0 0.5 GX 1+4
264.5553 -44.3957 6.5 24.8 12.8 1.1889 1.8 8.7 4U 1735-44
268.4361 -1.5206 3.3 19.2 168.3 2.1931 3.5 5.8 SW J1753.5-0127
270.2576 -25.0724 1.7 5.0 20.2 4.0613 6.9 1.5 GX 5-1
270.2408 -25.8329 2.7 5.7 17.6 2.5008 4.3 6.3 GRS 1758-258
274.0128 -14.0706 1.3 6.6 -164.6 5.8821 9.1 2.1 GX 17+2
275.9320 -30.3326 3.3 10.5 -18.3 2.1736 3.5 2.1 H1820-303
284.8856 -24.7894 6.9 12.5 -67.4 1.0774 1.7 11.4 HT1900.1-2455
288.7973 10.9520 1.1 35.4 -151.2 8.4446 10.6 0.4 GRS 1915+105
263.0208 -33.8568 2.7 15.7 29.0 2.8009 4.3 2.1 GX 354-0
243.0103 15.8432 3.6 46.2 139.2 8.0149 3.2 ------ UNKNOWN
249.3561 -39.2732 3.2 27.2 40.8 2.6734 3.6 ------ UNKNOWN
251.2382 -28.7516 2.7 20.8 61.9 3.0998 4.3 ------ UNKNOWN
266.2515 -42.5438 2.7 22.7 11.1 2.5717 4.3 ------ UNKNOWN
270.6614 -14.2279 3.5 6.3 166.2 2.0788 3.3 ------ UNKNOWN
298.4505 -69.4084 3.7 51.5 -11.7 5.0839 3.1 ------ UNKNOWN
325.6558 -47.8307 4.1 50.7 -44.4 12.0468 2.8 ------ UNKNOWN
308.4382 11.6630 3.1 47.9 -129.0 13.9231 3.7 ------ UNKNOWN
Plot creation:
Wed Feb 27 16:06:54 EST 2013