GRB 061110
GCN Circular 5795
Subject
GRB 061110: Swift detection of a burst
Date
2006-11-10T12:22:08Z (19 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
A. D. Falcone (PSU), S. D. Barthelmy (GSFC),
A. P. Beardmore (U Leicester), D. N. Burrows (PSU),
S. Campana (INAF-OAB), M. M. Chester (PSU),
J. R. Cummings (NASA/UMBC), P. A. Evans (U Leicester),
N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), V. Mangano (INAF-IASFPA),
F. E. Marshall (NASA/GSFC), T. Mineo (INAF-IASFPA), C. Pagani (PSU),
D. M. Palmer (LANL), M. Perri (ASDC),
P. Romano (Univ. Bicocca & INAF-OAB), G. Sato (GSFC/ISAS) and
L. Vetere (PSU) report on behalf of the Swift Team:
At 11:47:21 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 061110 (trigger=238108). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA,Dec 336.304, -2.267 {22h 25m 13s, -02d 16' 00"} (J2000)
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows multiple peaks
with a duration of about 30 sec. The peak count rate
was ~1000 counts/sec (15-350 keV), at ~5 sec after the trigger.
The XRT began observing the field at 11:48:30 UT, 69 seconds after the
BAT trigger. XRT found a bright, fading, uncatalogued X-ray source on-board.
The ground-calculated position, based on quick-look data products, is
RA(J2000) = 22h 25m 10.0s, Dec(J2000) = -02d 15' 29.1", with an
estimated uncertainty of 4.3 arcseconds (90% confidence radius).
This location is 55.8 arcseconds from the BAT on-board position, within
the BAT error circle. The initial flux in the 2.5s image was
5.2e-09 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of 400 seconds with the V filter
starting 71 seconds after the BAT trigger. No afterglow candidate has
been found in the initial data products. The 2.7'x2.7' sub-image
covers 100% of the XRT error circle. The 3-sigma upper limit is 19.0
mag. The 8'x8' region for the list of sources generated on-board
covers 100% of the XRT error circle. The list of sources is typically
complete to about 18.0 mag. No correction has been made for the
expected extinction of about 0.3 magnitudes.
We note that there are at least 35 galaxies within 10 arcmin
of the burst position.
GCN Circular 5796
Subject
GRB 061110: ROTSE-III Optical Limits
Date
2006-11-10T12:37:16Z (19 years ago)
From
Brad Schaefer at LSU <schaefer@grb.phys.lsu.edu>
B. E. Schaefer (Louisiana State), E.S. Rykoff (U Mich), F. Yuan (U Mich),
W. Rujopakarn (U Arizona), report on behalf of the ROTSE collaboration:
ROTSE-IIIa, located at Siding Spring Observatory, Australia, responded to
GRB 061110A (Swift trigger 238108), producing images beginning 8.8 s after
the GCN notice time. An automated response took the first image at
11:48:04.9 UT, 43.6 s after the burst, under fair conditions. We took 10
5-sec, 10 20-sec and 10 60-sec eposures. These unfiltered images are
calibrated relative to USNO A2.0 (R).
Comparison to the DSS (second epoch) reveals no new sources within the
3-sigma BAT error circle and also within the XRT error circle, for both
single images and coadding into sets of 10; the field is not crowded.
Individual images have limiting magnitudes ranging from 14.3-17.1; we set
the following specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
11:48:04.9 11:48:09.9 5 16.2 43.6 N
12:07:54.0 12:17:13.9 559 17.5 1232.7 Y
GCN Circular 5797
Subject
GRB 061110 : Optical afterglow candidate
Date
2006-11-10T17:01:14Z (19 years ago)
From
Yuji Urata at Saitama U <urata@crystal.heal.phy.saitama-u.ac.jp>
Y.C. Chen, Y.H. Lee, K.Y. Huang, W.H. Ip (NCU), Y. Urata (Saitama-U)
on behalf of EAFON team report:
"We have performed optical observations using Lulin 1-m telescope for
GRB 061110 from 51 min after the burst. We found a optical afterglow
candidate of GRB 061110 located at RA = 22:25:09.8 Dec = -02:15:30 in
our R and I band images. The source does not appear in DSS-II
images. Our quick analysis indicates that the brightness of this
source shows about 0.2 mag fading between 51 min and 85 min after the
burst.
Further deeply observations are encouraged."
This message can be cited.
GCN Circular 5798
Subject
GRB 061110: Candidate confirmed
Date
2006-11-10T17:29:44Z (19 years ago)
From
W.K. Zheng at NAOC <zwk@bao.ac.cn>
M.Zhai, L.P. Xing, Y.L. Qiu, J.Y. Wei, J.Y. Hu, J.S. Deng and W.K. Zheng,
on behalf of EAFON report:
We have imaged the field of GRB 061110 with the TNT 0.8m telescope at
Xinglong Observatory.The first image was taken at 11:48:37 UT, 76s
after the burst. There is afaint uncatalogued source within XRT circle at
position: Ra 22:25:09.8 Dec -02:15:30.7 J2000
This source has a mag ~19.5 in our combined White image at ~300s after the
burst.
This coordinate is consistent with the result given by Y.C. Chen et al.(GCN5797)
and shows fading behavior, so the candidate is confirmed.
Further analysis is under progress.
This message may be cited.
GCN Circular 5799
Subject
GRB 061110: NOT observations
Date
2006-11-10T22:01:29Z (19 years ago)
From
Daniele Malesani at Niels Bohr Inst,Dark Cosmology Center <malesani@astro.ku.dk>
Christina C. Thoene, Daniele Malesani, Johan P. U. Fynbo (DARK Cosmology
Centre), Christina Henriksen (DARK, NOT) and Dimitri Sharapov (NOT)
report on behalf of a larger collaboration:
We observed the optical afterglow of GRB061110 (GCNs 5797, 5798) on Nov.
10 UT 19:35 (7.9h after the burst) with ALFOSC at the Nordic Optical
Telescope on La Palma in the R and i bands.
We determined magnitudes of R=22.5 and i=21.6 using preliminary
photometric zeropoints from the NOT webpages. Compared to the R-band
magnitudes reported in GCNs 5797 and 5798, the afterglow has faded with
a temporal decay index of beta~0.6.