GRB 110708A
GCN Circular 12145
Subject
GRB 110708A: Konkoly observations
Date
2011-07-10T23:41:05Z (15 years ago)
From
Janos Kelemen at Konkoly Obs/Hungary <kelemen@konkoly.hu>
J. Kelemen,(Konkoly Obs.)
on behalf of the GRB OT observing program at the Konkoly Observatory.
We observed the field of INTEGRAL GRB 110708A (Gotz et al., GCN 12112) using
the Swift-XRT position provided by Valerio D'Elia. (GCN 12115) with a 60/90 cm
Schmidt telescope located at the Mountain Station of the Konkoly Observatory. We
coadded 6 red sensitive CCD images without filter with 300 sec exposure time
each. On the coadded frame we checked the position RA=22:40:27.33,
dec=+53:57:42.8 (J2000) provided by Daniel Perley (GCN 12116). Very near to
Perley's position, at RA=22:40:27.24, dec=+53:57:43.6 (J2000) we found a faint
marginally visible source which can be identical to Perley's object. Due to
the effect of the nearby dense asterism exact photometry was not possible. The
brightness of this source according to our estimation (based on nearby UCAC-3
stars) is 23 +/-.5 magnitude in R the band. If Perley's and our object are
identical we can suggest a fading nature for this source.
Time from
the trigger magnitude Band
----------------------------------------
154435 sec 23 +/- 0.5 R marginal detection
GCN Circular 12121
Subject
GRB 110708A: Swift/UVOT Observations
Date
2011-07-09T21:12:03Z (15 years ago)
From
Tyler Pritchard at PSU <tapritchard@astro.psu.edu>
T. A. Pritchard (PSU) and V. D'Elia (ASDC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 110708A
34934 s after the INTEGRAL trigger (Gotz et al., GCN Circ. 12112).
A faint detection of a source is detected inside of the Swift/XRT error
circle (V. D'Elia et al., GCN Circ 12115) and is consistent with the
position of the marginal detection by D. A. Perley et al.,
GCN Circ. 12116. The source appears to be of constant brightness across
UVOT exposures Preliminary 3-sigma magnitudes using the UVOT photometric
system (Poole et al. 2008, MNRAS, 383, 627) for the initial exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
v 34934 46819 1711 19.2 +/- 0.1
v 52022 58006 930 19.1 +/- 0.2
u 35462 53313 2220 >20.9
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.55 in the direction of the burst
(Schlegel et al. 1998).
GCN Circular 12117
Subject
GRB 110708A: Liverpool Telescope observations
Date
2011-07-09T09:27:11Z (15 years ago)
From
Cristiano Guidorzi at Ferrara U,Italy <guidorzi@fe.infn.it>
Z. Cano (Liverpool JMU), C. Guidorzi (U. Ferrara),
R.J. Smith (Liverpool JMU) report on behalf of a
large collaboration:
On 2011 July 08 at 04:46:10 UT the 2-m Liverpool Telescope
automatically began observing the INTEGRAL GRB 110708A
(Gotz et al., GCN Circ. 12112) using the gri filters,
corresponding to 168 s after the burst trigger time.
Inside the XRT error circle (D'Elia et al. GCN Circ. 12115)
we do not detect any uncatalogued source. In particular,
we do not detect the possible optical counterpart
mentioned by Perley et al. (GCN Circ. 12116) down to
the following limiting magnitudes:
Mid time from Total Exp Filter Magnitude
trigger (min) (s)
------------------------------------------------
20.1 30 i > 20.1
34.7 300 i > 20.4
33.0 360 r > 21.2
------------------------------------------------
Magnitudes have been calibrated from the nearby USNOB-1
star 1439-0418943 (RA=340.114656, Dec=+53.964514,
R2=16.51 mag, I=15.85 mag).
GCN Circular 12116
Subject
GRB 110708A: Lick observations
Date
2011-07-09T05:54:15Z (15 years ago)
From
Daniel Perley at U.C. Berkeley <dperley@astro.berkeley.edu>
D. A. Perley, K. Clubb, M. Ganeshalingam, M. Ellison, D. Cohen, and J.
S. Bloom (UC Berkeley) report:
We observed the position of INTEGRAL GRB 110708A (Gotz et al., GCN
12112) with the 1-meter Nickel telescope at Lick Observatory starting at
07:30:18 UT, 2.78 hours after the trigger. We acquired four exposures
of 300 seconds each (20 minutes total integration) in the I-band filter.
The XRT position given by D'Elia et al. (GCN 12115) lies near the center
of an asterism of five bright, nearby point-sources (one of which is
inside the XRT error circle), all of which are also visible in USNO
imaging and are likely Galactic stars. There is a possible, marginal
detection of a fainter source within the XRT error circle at:
RA=22:40:27.33, dec=+53:57:42.8 (J2000)
The approximate magnitude of this object, if real, is I~20.5 (calibrated
relative to USNO I-band). It is fainter than the DSS limit and also too
faint to clearly detect in individual exposures, so we cannot
conclusively associate it with GRB 110708A at this time.
We identify no other objects within the XRT error circle to a limiting
magnitude of I > 20.3, although the limit is complicated due to crowding
from the nearby stars.
GCN Circular 12115
Subject
GRB 110708A: Swift/XRT afterglow candidate for the INTEGRAL burst
Date
2011-07-08T23:20:47Z (15 years ago)
From
Valerio D'Elia at ASDC <delia@asdc.asi.it>
V. D'Elia, G. Stratta (ASDC) and J. Cannizzo (GSFC)
report, on behalf of the Swift team:
Swift XRT began a 5ks target of opportunity observation of the field
of INTEGRAL
burst GRB 110708A (Gotz et al., GCN circ 12112) on 14:25:40 UT, 34.9
ks after the
burst trigger. In the first 4.6 ks of data, we detect a source,
located at RA, Dec 340.11178, 53.96182 which is equivalent
to:
��RA(J2000) �= 22h 40m 26.82s
��Dec(J2000) = +53d 57' 42.5"
with an uncertainty of 5.7 arcseconds (radius, 90% containment). This
location is 21 arcseconds from the INTEGRAL reported position, within
the INTEGRAL error box.
The source count rate is 4.7E-03+/-1.2E-03 cts/s. At the present
stage, we cannot assess if the source is fading.
This circular is an official product of the Swift Team.
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GCN Circular 12112
Subject
GRB 110708A: a long GRB detected by INTEGRAL
Date
2011-07-08T07:15:45Z (15 years ago)
From
Diego Gotz at CEA <diego.gotz@cea.fr>
D.Gotz (CEA-Saclay), S.Mereghetti, A.Paizis (IASF-Milano), J.
Borkowski (CAMK, Torun), E. Bozzo, C.Ferrigno, M. Beck, V. Savchenko
(ISDC, Versoix),
on behalf of the IBAS Localization Team report:
a gamma ray burst lasting about 50 s has been detected by IBAS in the
IBIS/ISGRI data at 04:43:22 U.T. of July 8.
Its refined coordinates (J2000) are:
RA: 340.1208 [degrees]
DEC: +53.9597 [degrees]
with an uncertainty of 1.6 arcmin (90% c.l.).
A preliminary analysis gives a 20-200 keV peak flux of about 0.8 ph/
cm2 s (2 s integration time), and a fluence of about 2e-6 erg/cm2.
A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html
This message can be cited.