GRB 081003, GRB 081003A
GCN Circular 8323
Subject
GRB 081003A: OSN optical observations
Date
2008-10-04T06:08:03Z (18 years ago)
Edited On
2024-11-18T09:53:00Z (a year ago)
From
Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct@iaa.es>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>
A. de Ugarte Postigo (ESO, Santiago), F. J. Aceituno, M. Jelínek, J.
Gorosabel and A.J. Castro-Tirado (IAA-CSIC, Granada) on behalf of a larger
collaboration report:
"We have observed the field of GRB 081003A detected by INTEGRAL
(Mereghetti et al. GCN 8314) with the 1.5m OSN telescope at Sierra Nevada
Observatory (Granada, Spain). The observations consisted of 6x300s in
I-band, 2x300s in R-band and 2x300s in V-band (5.07, 6.17 and 5.31h after
the burst trigger respectively). We do not detect any new optical source
within the Swift/XRT error box (Page et al. GCN 8319) down to 3-sigma
limiting magnitudes of I > 22.0 and R > 22.5. We note, however that there
could be a marginal object (with low S/N significance in the I-band frame)
at coordinates (J2000): R.A.: 17:29:33.85, Dec.: +16:34:14.1 (+/-0.7"),
consistent with the XRT error box. Deeper observations would be needed in
order to confirm the reality of this source."
GCN Circular 8319
Subject
GRB 081003A: Swift-XRT Team position and analysis
Date
2008-10-03T23:31:33Z (18 years ago)
From
Kim Page at U.of Leicester <kpa@star.le.ac.uk>
K.L. Page, A.P. Beardmore (U. Leicester) and H.A. Krimm (CRESST/GSFC/USRA)
report on behalf of the Swift-XRT team:
Swift began observing the field of the INTEGRAL GRB 081003A (Mereghetti et
al., GCN Circ. 8314) 7.6 ks after the trigger. In 1.8 ks of Photon
Counting mode data, we detect a single source within the INTEGRAL error
circle at a position of RA, Dec = 262.39082, 16.57103, which is equivalent
to
RA(J2000): 17 29 33.80
Dec(J2000): +16 34 15.70
with an uncertainty of 3.9 arcsec (radius, 90% containment). The source
has a count rate of ~0.026 during this observation.
The spectrum of the source can be fitted by an absorbed power-law, with
Gamma = 3.6 +1.6/-1.2 and NH = (7 +6/-4)x10^21 cm^-2, compared to the
Galctic value of 6.67x10^20 cm^-2. It is not possible to determine whether
this source is fading given the current statistics.
This circular is an official product of the Swift-XRT team.
GCN Circular 8314
Subject
GRB 081003: A long GRB discovered by INTEGRAL
Date
2008-10-03T14:53:11Z (18 years ago)
From
Sandro Mereghetti at IASF/CNR <sandro@iasf-milano.inaf.it>
S.Mereghetti, A.Paizis (IASF-Milano), D.Gotz (CEA-Saclay), F. Fontani,
V.Beckmann, M. Beck (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
13:46:12 UT of October 3. The coordinates (J2000) are:
RA = 262.3758 [degrees]
DEC= 16.566 [degrees]
with an uncertainty of 2 arcmin (90% c.l.).
A preliminary analysis gives a peak flux in the 20-200 keV range of about
0.3 ph/cmq/s (1-s integration time) and a fluence over the same energy
range of about 4x10e-7 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.