Gamma-ray Burst 080613

(All information courtesy of the instrument teams.)

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Fri 13 Jun 08 09:35:57 UT
NOTICE_TYPE:    INTEGRAL Wakeup
TRIGGER_NUM:    5288,   Sub_Num: 0
GRB_RA:         213.2558d {+14h 13m 01s} (J2000),
                213.3617d {+14h 13m 27s} (current),
                212.6292d {+14h 10m 31s} (1950)
GRB_DEC:         +5.1583d {+05d 09' 30"} (J2000),
                 +5.1190d {+05d 07' 08"} (current),
                 +5.3920d {+05d 23' 31"} (1950)
GRB_ERROR:      2.67 [arcmin, radius, statistical only]
GRB_INTEN:      18.19 [sigma]
GRB_TIME:       34540.97 SOD {09:35:40.97} UT
GRB_DATE:       14630 TJD;   165 DOY;   08/06/13
SC_RA:          210.29 [deg] (J2000)
SC_DEC:           2.68 [deg] (J2000)
SUN_POSTN:       82.10d {+05h 28m 24s}  +23.24d {+23d 14' 20"}
SUN_DIST:       124.64 [deg]   Sun_angle= -8.8 [hr] (East of Sun)
MOON_POSTN:     200.82d {+13h 23m 18s}  -13.69d {-13d 41' 08"}
MOON_DIST:       22.55 [deg]
GAL_COORDS:     348.05, 60.67 [deg] galactic lon,lat of the burst
ECL_COORDS:     209.19, 17.44 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Possibly real GRB event

red DSS finding chart ps-file

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Fri 13 Jun 08 09:38:56 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    5288,   Sub_Num: 1
GRB_RA:         213.2631d {+14h 13m 03s} (J2000),
                213.3690d {+14h 13m 29s} (current),
                212.6366d {+14h 10m 33s} (1950)
GRB_DEC:         +5.1626d {+05d 09' 45"} (J2000),
                 +5.1233d {+05d 07' 24"} (current),
                 +5.3962d {+05d 23' 46"} (1950)
GRB_ERROR:      2.58 [arcmin, radius, statistical only]
GRB_INTEN:      25.04 [sigma]
GRB_TIME:       34540.97 SOD {09:35:40.97} UT
GRB_DATE:       14630 TJD;   165 DOY;   08/06/13
SC_RA:          210.29 [deg] (J2000)
SC_DEC:           2.68 [deg] (J2000)
SUN_POSTN:       82.10d {+05h 28m 24s}  +23.24d {+23d 14' 20"}
SUN_DIST:       124.64 [deg]   Sun_angle= -8.8 [hr] (East of Sun)
MOON_POSTN:     200.85d {+13h 23m 23s}  -13.70d {-13d 41' 44"}
MOON_DIST:       22.55 [deg]
GAL_COORDS:     348.07, 60.67 [deg] galactic lon,lat of the burst
ECL_COORDS:     209.20, 17.45 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Possibly real GRB event

GCN Circular #7871
D. Gotz (CEA-Saclay), A.Paizis, S.Mereghetti (IASF-Milano), V.Beckmann, M. Beck, R. Galis (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
A GRB lasting about 30 s has been detected by IBAS in IBIS/ISGRI data at 09:35:21 UT of June 13 2008. The coordinates (J2000) are:
RA: 213.2742 [degrees] DEC: +5.1687 [degrees]
with an uncertainty of 1.5 arcmin (90% c.l.).
A preliminary analysis yields a peak flux integrated over 1 s of about 1.3 ph/cmsq/s (20-200 keV) and a fluence over the same energy range of about 1.3e-6 erg/cmsq.
A plot of the light curve will be posted at
http://ibas.iasf-milano.inaf.it/IBAS_Results.html
This message can be cited.
GCN Circular #7872
C. Guidorzi (INAF-OAB), E. Rol (U. Leicester), I. Steele, A. Melandri, C.G. Mundell, D.F. Bersier, M.F. Bode, M.J. Burgdorf, S.N. Fraser, S. Kobayashi, C.J. Mottram, R.J. Smith (Liverpool JMU), A. Gomboc (U. Ljubljana), P. O'Brien, N. Bannister, N. Tanvir (U. Leicester) report on behalf of larger GRB collaboration:
The 2-m Faulkes Telescope North observed the field of the INTEGRAL GRB 080613 (Gotz et al. GCN Circ. 7871) starting 3.9 min after the trigger time. We detect an uncatalogued, likely fading source in R (~19 mag) also visible in B and i' bands and not visible in the DSS, within the offline INTEGRAL error circle at the following position (J2000):
```
RA = 14:13:05.02
Dec= +5:10:23.5
```
Further observations are being taken.

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Fri 13 Jun 08 10:16:47 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    5288,   Sub_Num: 2
GRB_RA:         213.2741d {+14h 13m 06s} (J2000),
                213.3800d {+14h 13m 31s} (current),
                212.6476d {+14h 10m 35s} (1950)
GRB_DEC:         +5.1686d {+05d 10' 07"} (J2000),
                 +5.1293d {+05d 07' 45"} (current),
                 +5.4022d {+05d 24' 08"} (1950)
GRB_ERROR:      1.50 [arcmin, radius, statistical only]
GRB_INTEN:      25.04 [sigma]
GRB_TIME:       34540.97 SOD {09:35:40.97} UT
GRB_DATE:       14630 TJD;   165 DOY;   08/06/13
SC_RA:          210.29 [deg] (J2000)
SC_DEC:           2.68 [deg] (J2000)
SUN_POSTN:       82.13d {+05h 28m 31s}  +23.24d {+23d 14' 25"}
SUN_DIST:       124.62 [deg]   Sun_angle= -8.8 [hr] (East of Sun)
MOON_POSTN:     201.14d {+13h 24m 34s}  -13.82d {-13d 49' 28"}
MOON_DIST:       22.51 [deg]
GAL_COORDS:     348.09, 60.67 [deg] galactic lon,lat of the burst
ECL_COORDS:     209.21, 17.46 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       refined_coordinates_after_offline_analysis

GCN Circular #7880
C. Clemens, A. Updike (Clemson University), T. Kruehler, J. Greiner, A. Kupcu Yoldas, A. Yoldas (all MPE Garching) and G. Szokoly (Eoetvoes Univ., Budapest and MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 080613A (INTEGRAL trigger 5288; Gotz et al., GCN #7871) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m ESO/MPI telescope at La Silla Observatory (Chile).
Observations started at 00:25 UT on June 14th, 2008, 14.8 hrs after the GRB trigger with 25 mins of effective exposures in g'r'i'z' and 20 mins in JHK.
We do not detect any object at the position reported by Guidorzi et al., GCN #7872) to the following 3-sigma upper limits:
```
g' > 24.2,
r' > 23.9,
i' > 23.5,
z' > 23.4,
J > 22.3 and
H > 21.3.
```
Given upper limits are calibrated against SDSS as well as 2MASS field stars.
This indicates a clear fading of the source. We therefore confirm this to be the afterglow of GRB 080613A.
GCN Circular #7881
E. A. Hoversten (PSU) and S. T. Holland (CRESST/USRA/GSFC) on behalf of the Swift/UVOT team.
The Swift Ultra-Violet/Optical Telescope (UVOT) began settled observations of the INTEGRAL-detected GRB 080613A (Gotz, et al., GCN Circ. 7871) 6.7 hours after the trigger. No afterglow is detected at the position of the R-band detection by the Faulkes Telescope North (Guidorzi, et al., GCN Circ. 7872). The 22.2 magnitude upper limit in the white band suggests the R~19 object seen by Guidorzi, et al. 3.9 minutes after the trigger has faded and is indeed the afterglow.
```
Filter  T_start(s)  T_stop(s)  Exp(s)  Mag UL (3sig)

white     24725      25189      456     >22.2
v         25195      25638      436     >20.5
b         24257      24720      456     >21.5
```
The values quoted above are in the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627). They are not corrected for the expected Galactic extinction corresponding to a reddening of E(B-V)=0.023 mag in the direction of the burst (Schlegel et al. 1998).
GCN Circular #7882
C. Guidorzi (INAF-OAB) and C. B. Markwardt (CRESST/GSFC/UMD) report on behalf of the Swift-XRT team:
The Swift XRT began observing the INTEGRAL GRB 080613A (Gotz et al., GCN Circ 7871) on June 13, 16:19 UT, 24.2 ks after the INTEGRAL trigger. The data consist of 3.6 ks observed in Photon Counting mode.
We detect a single X-ray source within the INTEGRAL error circle at the position RA, Dec =3D 213.27213, +5.17256 which is equivalent to:
```
RA (J2000):  14 13 05.31
Dec (J2000): +05 10 21.2
```
with an uncertainty of 5.2 arcsec (radius, 90% confidence). This position lies 4.9" from the optical afterglow found with the=20 Faulkes Telescope North (Guidorzi et al., GCN Circ. 7872) and later confirmed by GROND (Clemens et al. GCN Circ. 7880) and Swift-UVOT (Hoversten and Holland, GCN Circ. 7881), and is therefore consistent with being the X-ray afterglow of GRB 080613A.
Presently there is marginal evidence for fading: a power-law fit of the=20 light curve gives a decay index of 1.2 =B1 1.5, so still compatible with a constant=20 rate of of (2.8 =B1 0.3)e-2 counts/s.
Forced by the small number of counts, we extracted the 0.3-10 keV spectrum from a 10-pixel radius circular region and adopted the Cash statistics. The spectrum can be fit with a power law with an absorbing column density fixed to the Galactic value (2.0e20 cm-2) and a photon index of 1.3 =B1 0.3. The observed (unabsorbed) 0.3-10 keV flux is 1.50 (1.53)e-12 erg cm-2 s-1.
This circular is an official product of the Swift-XRT team.
GCN Circular #7885
M. Yoshida, K. Yanagisawa, Kuroda, D., Y. Shimizu, S. Nagayama, Toda, H. (OAO, NAOJ) and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We performed optical imaging observation (g', Rc, and Ic) of the field of GRB 080613A (Gotz et al. GCN 7871) with 50cm MITSuME telescope at Okayama Astrophysical Observatory from 13:44:35 UT (4h 9m after the trigger) to UT 15:13:05 on June 13 2008.
We found no new source within a 10 arcsec radius of the position of the optical afterglow candidate reported by Guidorzi et al. (GCN 7872). Three sigma limiting magnitudes of our observation are listed below.
```
Start-UT              mid-UT    exp-T    g'      Rc      Ic
--------------------------------------------------------------
2008-06-13 13:44:35   14:28:50  77min    >18.4   >17.7   >16.7
--------------------------------------------------------------
```
GCN Circular #7888
Poonam Chandra (NRAO/UVA) and Dale A. Frail (NRAO) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration:
"We used the Very Large Array to observe the field of view toward GRB 080613A (GCN 7871) at a frequency of 8.46 GHz on 2008 June 16.17 UT. The GRB radio afterglow is undetected and the peak radio flux at the XRT afterglow position (GCN 7882) is 7 =B1 45 uJy.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."
GCN Report 148.1
GCN_Report 148.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_148_1.pdf by C.B. Markwardt at CRESST/U.Md/NASA/GSFC titled: "Final Swift Observations on INTEGRAL GRB 080613A"

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Jochen Greiner, last update: 07-Jul-2008 [Disclaimer]