GRB 080120
GCN Circular 7194
Subject
GRB 080120: a long GRB detected by INTEGRAL
Date
2008-01-20T18:51:53Z (17 years ago)
From
Sandro Mereghetti at IASF/CNR <sandro@iasf-milano.inaf.it>
S.Mereghetti, A.Paizis (IASF-Milano), D.Gotz (CEA-Saclay), A.Manousakis,
V.Beckmann, M. Beck (ISDC, Versoix), and J. Borkowski (CAMK, Torun)
on behalf of the IBAS Localization Team report:
A GRB lasting about 20 s has been detected by IBAS in IBIS/ISGRI
data at 17:28:30 UT of January 20.
The coordinates (J2000) are:
RA = 225.2547
Dec= -10.8854
with an uncertainty of 2 arcmin (90% c.l.).
A preliminary analysis gives a peak flux in the 20-200 keV range of about
3 ph/cmq/s (1-s integration time) and a fluence over the same energy range
of 1.5e-6 erg/cmq.
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 7195
Subject
GRB080120: Swift XRT position
Date
2008-01-20T23:24:55Z (17 years ago)
From
Boris Sbarufatti at INAF-IASF-Pa <sbarufatti@ifc.inaf.it>
B. Sbarufatti and V. Mangano (INAF-IASF PA) on behalf
of the Swift XRT team
Swift XRT started a ToO observation of the INTEGRAL burst
GRB080120 at 19:47 UT. The analysis of the initial 1.5 ks
of data of the first orbit shows a single bright uncatologued
X-ray source in the field at
RA (J2000): 15h 01m 03.13s
Dec (J2000): -10d 52' 31.8"
with an uncertainty of 3.8 arcsec (radius, 90% confidence). This is
46 arcsec away from the GRB position given in Mereghetti et al., GCN
Circ. 7194. The source has a count rate of (2.1+-0.1)E-1 counts/s
and, assuming a Crab spectrum, a flux of 1E-10 erg/cm2/s. More
data are being collected that will be used to determine whether the
source is fading and to perform a spectral analysis.
This Circular is an official product of the Swift XRT Team.
GCN Circular 7196
Subject
GRB 080120 : Planned XMM-Newton observation
Date
2008-01-20T23:52:53Z (17 years ago)
From
Norbert Schartel at XMM-Newton/ESA <too@xmm.vilspa.esa.es>
XMM-Newton will observe GRB 080120 at location
(RA=15h 01m 1.13s, DEC=-10 d 53' 7.4", J2000),
starting at 23:00:00 UT, on Jan 20, 2008,
for an exposure of about 20000 seconds.
================================================================================================
This message and any attachments are intended for the use of the addressee or addressees only. The
unauthorised disclosure, use, dissemination or copying (either in whole or in part) of its content
is prohibited. If you received this message in error, please delete it from your system and notify
the sender. E-mails can be altered and their integrity cannot be guaranteed. ESA shall not be liable
for any e-mail if modified.
=================================================================================================
GCN Circular 7197
Subject
GRB 080120: GROND detection
Date
2008-01-21T08:13:12Z (17 years ago)
From
Jochen Greiner at MPI <jcg@mpe.mpg.de>
T. Kruehler, J. Greiner, S. McBreen, S. Loew, A. Kuepcue-Yoldas, A. Yoldas
(all MPE Garching) report for the GROND team:
We started observing GRB 080120 observed by INTEGRAL (Mereghetti et al. 2008,
GCN #7194) simultaneously in grizJHK with GROND, mounted at the 2.2m MPI/ESO
telescope at La Silla (Chile), at 7:02 UT, about 13.5 hrs after the GRB.
At this time, the GRB location was becoming visible at 20 degrees
above horizon.
We find an optical/NIR source inside the 3.8 arcsec Swift/XRT error circle
of the X-ray afterglow (Sbarufatti et al. 2008, GCN #7195). The object is
seen in all bands except K, implying a redshift smaller than 3.5.
The coordinates are (+-1 arcsec):
RA (2000.0) = 15h 01m 03.2s
Decl (2000.0) = -10d 52' 30"
We estimate rough magnitudes of g'=21.1, r'=20.5, i'=20.0, z'=19.8,
J=19.6, H=19.4, K>18.9, calibrated against USNO and 2MASS stars.
Given the high airmass and humidity, these estimates may have large errors.
No statement about variability can be made at this point. Observations are
continuing.
GCN Circular 7198
Subject
UVOT detection of GRB080120
Date
2008-01-21T11:50:51Z (17 years ago)
From
Patricia Schady at MSSL/Swift <ps@mssl.ucl.ac.uk>
P. Schady (MSSL-UCL) and B. Sbarufatti (INAF-IASF PA) report on behalf of
the Swift UVOT team:
Swift UVOT started a ToO observation of the INTEGRAL burst GRB080120 at
2008-01-20T19:50 UT, ~2.4hrs after the INTEGRAL trigger (Mereghetti et
al., GCN 7194). Observations were taken in the white and v-band only. A
new source is detected within the XRT error circle (Sbarufatti & Mangano,
GCN7195), in co-added images in both these filters at
RA: 15:01:03.276
DEC: -10:52:29.79
with an uncertainty of 0.6 arcsec (90% confidence). This is consistent
with the position reported by Kruehler et al. (GCN 7197). The source is
seen to decay in the white band and has the following magnitudes and
3-sigma upper limits (in the UVOT photometric system,Breeveld et al., GCN
Circ. 6614)
Filter Tstart Exp Magnitude
(s) (s)
white 9257 401 21.45 +/- 0.39
white 14524 679 > 22.08
v 8490 746 20.45 +/- 0.41
v 13232 126 20.53 +/- 0.33
The values quoted above are not corrected for the expected non-negligible
Galactic extinction corresponding to a reddening of E(B-V) = 0.10 mag in the
direction of the burst (Schlegel et al. 1998).
GCN Circular 7199
Subject
GRB 080120: Swift-XRT refined analysis
Date
2008-01-21T14:14:40Z (17 years ago)
From
Boris Sbarufatti at INAF-IASF-Pa <sbarufatti@ifc.inaf.it>
B. Sbarufatti, V. Mangano (INAF-IASF PA)
report on behalf of the Swift-XRT team:
We have analyzed the 3.9 ks of data of the ToO observation of GRB
080120,
started on Jan 20 at 19:47 UT. The refined position of the X-ray
source is
Ra (J2000): 15h 01m 03.14s
Dec (J2000): -10d 52' 30.7"
with an uncertainty of 3.7 arcsec (radius, 90% confidence). This is
1.1 arcsec away from the first XRT position given in
Sbarufatti & Mangano (GCN Circ. 7195), 47.2 arcsec from
the initial INTEGRAL position of Mereghetti et al. (GCN Circ. 7194),
and 2.2 arcsec from the optical counterparts reported by Kruehler et
al.
(GCN Circ, 7197) and by Schady & Sbarufatti (GCN Circ. 7198).
The light curve shows an initial flare between 8 and 9 ks from the
trigger, followed by a very steep decay (slope 2.9 +/- 0.4).
At this decay rate the source will be at a level of 3E-4 counts/s today
at 17:30 UT.
The average spectrum can be modeled by an absorbed powerlaw with
photon index 2.5 +/- 0.3 with a column density of (1.5 +/- 0.6)E21
cm^-2,
sligthly in excess with respect to the Galactic value (7.7E20 cm^-2).
The observed (unabsorbed) 0.3-10 keV flux is
4.7E-12 (8.2E-12) ergs cm^-2 s^-1.
This circular is an official product of the Swift-XRT team.
GCN Circular 7200
Subject
VLA radio upper limit on GRB 080120
Date
2008-01-21T19:57:53Z (17 years ago)
From
Poonam Chandra at U Virginia/NRAO <pc8s@virginia.edu>
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
080120 (GCN 7194) at a frequency of 8.46 GHz on 2008 January 8th at
21.72 UT.
The GRB is undetected and the 2-sigma upper limit on the peak radio flux
at the
SWIFT-XRT position (GCN 7199) is 100 uJy (rms 50 uJy).
The National Radio Astronomy Observatory is a facility of the National
Science Foundation operated under cooperative agreement by Associated
Universities, Inc."
GCN Circular 7202
Subject
GRB 080120: GROND confirmation of the optical afterglow
Date
2008-01-22T09:10:16Z (17 years ago)
From
Thomas Kruehler at MPE/MPI <kruehler@mpe.mpg.de>
T. Kruehler, J. Greiner, S. McBreen, S. Loew, A. Kuepcue-Yoldas, C. Clemens, A. Yoldas
(all MPE Garching) report on behalf of the GROND team:
We observed the field of the INTEGRAL burst GRB 080120 (Mereghetti et al. 2008, GCN #7194) with the 2.2 m MPI/ESO telescope equipped with the multi-channel imager GROND.
Observations started at 07:04 UTC on the 22nd of January at an airmass of 2.5 and seeing around 1.0".
The optical/NIR source (Kruehler et al. 2008, GCN #7197, P. Schady et al. 2008, GCN #7198) inside the XRT-error circle (Sbarufatti et al. 2008, GCN #7195) is still detected, and clearly fading. Fitting a power-law to the two epochs yields a slope around 1.5.
A finding chart will be posted at: www.mpe.mpg.de/~jcg/grb080120.html