Gamma-ray Burst 150912A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sat 12 Sep 15 10:37:41 UT 
NOTICE_TYPE:    INTEGRAL Wakeup
TRIGGER_NUM:    7236,   Sub_Num: 0
GRB_RA:         248.4339d {+16h 33m 44s} (J2000),
                248.6662d {+16h 34m 40s} (current),
                247.6945d {+16h 30m 47s} (1950)
GRB_DEC:        -20.9911d {-20d 59' 27"} (J2000),
                -21.0231d {-21d 01' 22"} (current),
                -20.8871d {-20d 53' 13"} (1950)
GRB_ERROR:      3.22 [arcmin, radius, statistical only] 
GRB_INTEN:      8.54 [sigma]   
GRB_TIME:       38258.11 SOD {10:37:38.11} UT
GRB_DATE:       17277 TJD;   255 DOY;   15/09/12
SC_RA:          243.74 [deg] (J2000)
SC_DEC:         -15.54 [deg] (J2000)
SUN_POSTN:      170.22d {+11h 20m 52s}   +4.21d {+04d 12' 42"}
SUN_DIST:        80.79 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:     161.10d {+10h 44m 24s}   +6.00d {+05d 59' 48"}
MOON_DIST:       89.89 [deg]   
GAL_COORDS:     356.93, 17.84 [deg] galactic lon,lat of the burst
ECL_COORDS:     249.93,  0.96 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.
COMMENTS:       Time_Scale=10.0000 and Time_Error=10.0000.
COMMENTS:       Possibly real GRB event

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sat 12 Sep 15 10:37:51 UT 
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    7236,   Sub_Num: 1
GRB_RA:         248.4449d {+16h 33m 47s} (J2000),
                248.6773d {+16h 34m 43s} (current),
                247.7054d {+16h 30m 49s} (1950)
GRB_DEC:        -21.0276d {-21d 01' 38"} (J2000),
                -21.0595d {-21d 03' 33"} (current),
                -20.9236d {-20d 55' 24"} (1950)
GRB_ERROR:      2.65 [arcmin, radius, statistical only] 
GRB_INTEN:      18.87 [sigma]  
GRB_TIME:       38262.68 SOD {10:37:42.68} UT
GRB_DATE:       17277 TJD;   255 DOY;   15/09/12
SC_RA:          243.74 [deg] (J2000)
SC_DEC:         -15.54 [deg] (J2000)
SUN_POSTN:      170.22d {+11h 20m 52s}   +4.21d {+04d 12' 42"}
SUN_DIST:        80.80 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:     161.10d {+10h 44m 24s}   +6.00d {+05d 59' 46"}
MOON_DIST:       89.90 [deg]   
GAL_COORDS:     356.91, 17.81 [deg] galactic lon,lat of the burst
ECL_COORDS:     249.94,  0.92 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.
COMMENTS:       Time_Scale=1.2799 and Time_Error=8.0000.
COMMENTS:       Possibly real GRB event
COMMENTS:
COMMENTS:        NOTE: This INTEGRAL event is temporally(4.0<100sec) coincident with the FERMI_GBM event (trignum=463747062).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 12 Sep 15 10:38:04 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     463747062
GRB_RA:          266.183d {+17h 44m 44s} (J2000),
                 266.419d {+17h 45m 41s} (current),
                 265.433d {+17h 41m 44s} (1950)
GRB_DEC:         -21.617d {-21d 37' 00"} (J2000),
                 -21.622d {-21d 37' 19"} (current),
                 -21.596d {-21d 35' 46"} (1950)
GRB_ERROR:       27.88 [deg radius, statistical plus systematic]
GRB_INTEN:       50 [cnts/sec]
DATA_SIGNIF:     4.80 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        17277 TJD;   255 DOY;   15/09/12
GRB_TIME:        38258.70 SOD {10:37:38.70} UT
GRB_PHI:          87.00 [deg]
GRB_THETA:        60.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      1.16
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      94%  GRB
2nd_MOST_LIKELY:   3%  SGR_1806n20
DETECTORS:       0,0,1, 0,0,0, 0,0,0, 0,1,0, 0,0,
SUN_POSTN:       170.22d {+11h 20m 52s}   +4.21d {+04d 12' 41"}
SUN_DIST:         97.31 [deg]   Sun_angle= -6.4 [hr] (East of Sun)
MOON_POSTN:      161.10d {+10h 44m 24s}   +6.00d {+05d 59' 44"}
MOON_DIST:       106.42 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:        6.15,  3.98 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      266.45,  1.78 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150912443/quicklook/glg_lc_medres34_bn150912443.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 114.47,-10.40 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the INTEGRAL event (trignum=7236).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 12 Sep 15 10:38:18 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      57
TRIGGER_NUM:     463747062
GRB_RA:          245.967d {+16h 23m 52s} (J2000),
                 246.212d {+16h 24m 51s} (current),
                 245.185d {+16h 20m 44s} (1950)
GRB_DEC:         -29.117d {-29d 07' 00"} (J2000),
                 -29.152d {-29d 09' 07"} (current),
                 -29.002d {-29d 00' 05"} (1950)
GRB_ERROR:       14.33 [deg radius, statistical plus systematic]
GRB_INTEN:       157 [cnts/sec]
DATA_SIGNIF:     11.10 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        17277 TJD;   255 DOY;   15/09/12
GRB_TIME:        38258.70 SOD {10:37:38.70} UT
GRB_PHI:          73.00 [deg]
GRB_THETA:        75.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.75
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   2%  Generic Transient
DETECTORS:       0,0,1, 0,0,0, 0,0,0, 0,1,0, 0,0,
SUN_POSTN:       170.22d {+11h 20m 52s}   +4.21d {+04d 12' 41"}
SUN_DIST:         79.92 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      161.10d {+10h 44m 25s}   +6.00d {+05d 59' 42"}
MOON_DIST:        88.67 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      349.04, 14.17 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      248.97, -7.41 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150912443/quicklook/glg_lc_medres34_bn150912443.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 114.47,-10.40 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the INTEGRAL event (trignum=7236).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 12 Sep 15 10:38:34 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     463747062
GRB_RA:          241.670d {+16h 06m 41s} (J2000),
                 241.920d {+16h 07m 41s} (current),
                 240.874d {+16h 03m 30s} (1950)
GRB_DEC:         -32.640d {-32d 38' 23"} (J2000),
                 -32.681d {-32d 40' 52"} (current),
                 -32.506d {-32d 30' 21"} (1950)
GRB_ERROR:       5.54 [deg radius, statistical only]
DATA_SIGNIF:     11.40 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        17277 TJD;   255 DOY;   15/09/12
GRB_TIME:        38258.70 SOD {10:37:38.70} UT
GRB_PHI:          72.00 [deg]
GRB_THETA:        80.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       170.22d {+11h 20m 53s}   +4.21d {+04d 12' 41"}
SUN_DIST:         77.06 [deg]   Sun_angle= -4.8 [hr] (East of Sun)
MOON_POSTN:      161.11d {+10h 44m 25s}   +5.99d {+05d 59' 40"}
MOON_DIST:        85.57 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      343.78, 14.34 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      245.93,-11.54 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150912443/quicklook/glg_lc_medres34_bn150912443.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the INTEGRAL event (trignum=7236).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 12 Sep 15 10:39:52 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      2
TRIGGER_NUM:     463747062
GRB_RA:          249.690d {+16h 38m 46s} (J2000),
                 249.928d {+16h 39m 43s} (current),
                 248.933d {+16h 35m 44s} (1950)
GRB_DEC:         -24.120d {-24d 07' 11"} (J2000),
                 -24.150d {-24d 09' 00"} (current),
                 -24.022d {-24d 01' 17"} (1950)
GRB_ERROR:       4.19 [deg radius, statistical only]
DATA_SIGNIF:     18.10 [sigma]
DATA_INTERVAL:   19.456 [sec]
GRB_DATE:        17277 TJD;   255 DOY;   15/09/12
GRB_TIME:        38258.70 SOD {10:37:38.70} UT
GRB_PHI:          73.00 [deg]
GRB_THETA:        69.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       170.22d {+11h 20m 53s}   +4.21d {+04d 12' 40"}
SUN_DIST:         82.38 [deg]   Sun_angle= -5.3 [hr] (East of Sun)
MOON_POSTN:      161.12d {+10h 44m 28s}   +5.99d {+05d 59' 28"}
MOON_DIST:        91.37 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      355.19, 14.96 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      251.52, -1.97 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150912443/quicklook/glg_lc_medres34_bn150912443.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the INTEGRAL event (trignum=7236).

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sat 12 Sep 15 10:40:51 UT 
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    7236,   Sub_Num: 2
GRB_RA:         248.4400d {+16h 33m 46s} (J2000),
                248.6724d {+16h 34m 41s} (current),
                247.7004d {+16h 30m 48s} (1950)
GRB_DEC:        -21.0330d {-21d 01' 58"} (J2000),
                -21.0649d {-21d 03' 53"} (current),
                -20.9290d {-20d 55' 43"} (1950)
GRB_ERROR:      2.57 [arcmin, radius, statistical only] 
GRB_INTEN:      27.95 [sigma]  
GRB_TIME:       38271.11 SOD {10:37:51.11} UT
GRB_DATE:       17277 TJD;   255 DOY;   15/09/12
SC_RA:          243.74 [deg] (J2000)
SC_DEC:         -15.54 [deg] (J2000)
SUN_POSTN:      170.22d {+11h 20m 53s}   +4.21d {+04d 12' 39"}
SUN_DIST:        80.80 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:     161.12d {+10h 44m 30s}   +5.99d {+05d 59' 20"}
MOON_DIST:       89.87 [deg]   
GAL_COORDS:     356.90, 17.81 [deg] galactic lon,lat of the burst
ECL_COORDS:     249.94,  0.92 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.
COMMENTS:       Time_Scale=20.0000 and Time_Error=20.0000.
COMMENTS:       Possibly real GRB event
COMMENTS:
COMMENTS:        NOTE: This INTEGRAL event is temporally(13.0<100sec) coincident with the FERMI_GBM event (trignum=463747062).

GCN NOTICE

 
TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sat 12 Sep 15 11:32:11 UT 
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    7236,   Sub_Num: 3
GRB_RA:         248.4435d {+16h 33m 46s} (J2000),
                248.6759d {+16h 34m 42s} (current),
                247.7039d {+16h 30m 49s} (1950)
GRB_DEC:        -21.0337d {-21d 02' 00"} (J2000),
                -21.0656d {-21d 03' 55"} (current),
                -20.9297d {-20d 55' 46"} (1950)
GRB_ERROR:      2.00 [arcmin, radius, statistical only] 
GRB_INTEN:      27.95 [sigma]  
GRB_TIME:       38271.11 SOD {10:37:51.11} UT
GRB_DATE:       17277 TJD;   255 DOY;   15/09/12
SC_RA:          243.74 [deg] (J2000)
SC_DEC:         -15.54 [deg] (J2000)
SUN_POSTN:      170.25d {+11h 21m 01s}   +4.20d {+04d 11' 50"}
SUN_DIST:        80.77 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:     161.53d {+10h 46m 08s}   +5.86d {+05d 51' 47"}
MOON_DIST:       89.45 [deg]   
GAL_COORDS:     356.91, 17.81 [deg] galactic lon,lat of the burst
ECL_COORDS:     249.94,  0.92 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.
COMMENTS:       Time_Scale=20.0000 and Time_Error=20.0000.
COMMENTS:       refined_coordinates_after_offline_analysis
COMMENTS:
COMMENTS:        NOTE: This INTEGRAL event is temporally(13.0<100sec) coincident with the FERMI_GBM event (trignum=463747062).

GCN Circular #18291
S.Mereghetti (IASF-Milano), D.Gotz (CEA, Saclay), E.Bozzo, C.Ferrigno, L.Ducci (ISDC, Versoix), and J.Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
a gamma ray burst lasting about 30 s has been detected by IBAS in the IBIS/ISGRI data at 10:37:30 UT of 2015 September 12.
The refined coordinates (J2000) are:
```
R.A.= 248.4435 deg
DEC.= -21.03376  deg
```
with an uncertainty of 2 arcmin (90% c.l.).
The burst had a peak flux of about 1.5 counts/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 1e-6 erg/cmq.
A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html
GCN Circular #18297
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a ToO observation of the INTEGRAL GRB 150912A. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/ToO_GRBs/00020557
Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the INTEGRAL event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.
GCN Circular #18299
E. Bissaldi (INFN Bari) reports on behalf of the Fermi GBM Team:
"At 10:37:38.70 UT on 12 September 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 150912A (trigger 463747062/150912443), which was also detected by INTEGRAL (Mereghetti et al. 2015, GCN 18291). The GBM on-ground location is consistent with the INTEGRAL position.
The angle from the Fermi-LAT boresight at the GBM trigger time is 67 degrees.
The GBM light curve consists of a single peak with a duration (T90) of about 30 s (50-300 keV). The time-averaged spectrum from T0-6 s to T0+22 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.11 +/- 0.10 and the cutoff energy, parameterized as Epeak, is 250 +/- 40 keV.
The event fluence (10-1000 keV) in this time interval is (4.5 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux, measured starting from T0+2.2 s in the 10-1000 keV band, is 2.82 +/- 0.25 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #18300
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias
V. Lipunov, E. Gorbovskoy, N.Tyurina, V.Kornilov, P.Balanutsa, A.Kuznetsov, D.Kuvshinov, E.Popova Lomonosov Moscow State University, Sternberg Astronomical Institute
K.Ivanov, O.Gres, N.M.Budnev, S.Yazev, Irkutsk State University
D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov, A.Gabovich Blagoveschensk Educational State University, Blagoveschensk
V.Krushinski, I.Zalozhnih Ural Federal University, Kourovka
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA)
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in IAC was pointed to the GRB150912A 33865 sec (9.4 h) after trigger time at 2015-09-12 20:01:55 UT directly after the sunset. On our first single and coadd sets we haven`t found optical transient within IPN error-box (Mereghetti et. al GCN 18291). The 5-sigma upper limit has been about 19.2 on single (180 sec) and ~ 20.3 at coadd (10x180 sec) images. The message may be cited.
GCN Circular #18304
D. Kuroda (OAO, NAOJ), H. Hanayama, T. Miyaji, J. Watanabe (IAO, NAOJ), K. Yanagisawa (OAO, NAOJ), S.Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME and OISTER collaboration:
We observed the field of GRB 150912A (Mereghetti et al., GCNC 18291) with the optical three color (g', Rc and Ic) CCD camera attached to the Murikabushi 1m telescope of Ishigakijima Astronomical Observatory.
The observation started on 2015-09-12 12:15:39 UT (~1.6 h after the burst). We did not find any new point source within the INTEGRAL-IBAS error circle (Mereghetti et al., GCNC 18291) in all the three bands.
Three sigma upper limits of the OT are listed below. We used GSC2.3 catalog for flux calibration.
```
#T0+[day]  MID-UT    T-EXP[sec]   g'     Rc     Ic
-----------------------------------------------------
0.07014    12:18:30     300.0   >19.7  >19.4  >18.6
-----------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #18310
K.L. Page (U. Leicester), M. H. Siegel (PSU) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the INTEGRAL-detected burst GRB 150912A (Mereghetti et al. GCN Circ. 18291), collecting 4.7 ks of Photon Counting (PC) mode data between T0+32.6 ks and T0+50.4 ks.
No X-ray sources have been detected inside or close to the INTEGRAL error region. The 3-sigma upper limit in the field ranges from ~0.002 to ~0.004 ct s^-1, corresponding to a 0.3-10 keV observed flux of 9.0e-14 to 1.5e-13 erg cm^-2 s^-1 (assuming a typical GRB spectrum).
Two uncatalogued sources were detected too far from the GRB position to be likely afterglow candidates.
The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at http://www.swift.ac.uk/ToO_GRBs/00020557.
Swift-UVOT also began settled observations of the field of GRB 150912A 32.6 ks after the INTEGRAL trigger. No optical afterglow consistent with the INTEGRAL position is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures are:
```
Filter	       T_start(s)   T_stop(s)	   Exp(s)	  Mag

w2		 32643	      50446	    4789	 >21.2
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.42 in the direction of the burst (Schlegel et al. 1998).
This circular is an official product of the Swift-XRT and UVOT teams.

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Jochen Greiner, last update: 14-Sep-2015 [Disclaimer]