GRB 040730
GCN Circular 2634
Subject
GRB 040730: a long GRB detected with INTEGRAL
Date
2004-07-30T03:17:04Z (21 years ago)
From
Diego Gotz at IASF-CNR <diego@mi.iasf.cnr.it>
D. Gotz, S. Mereghetti (IASF, Milano), N. Mowlavi, M. Beck, J.Borkowski
(ISDC) on behalf of the IBAS Localization Team report:
A 50 s long GRB has been detected with the INTEGRAL Burst Alert System
(IBAS) on July 30 at 02:11:55 UT. The GRB has been detected with
IBIS/ISGRI in the 15-200 keV band (IBAS Alert # 1888)
Its coordinates (J2000) are:
R.A. 15h 53m 16s
Dec. -56deg 27' 03''
with an uncertainty of 2 arcmin (90% c.l. radius)
The preliminary peak flux in the 20-200 keV range is about 0.4
photons/cmsq/s (4E-8 erg/cmsq/s) (1 s integration time).
This message can be cited.
GCN Circular 2635
Subject
GRB 040730: Optical observations
Date
2004-07-31T00:54:27Z (21 years ago)
Edited On
2024-11-18T09:49:31Z (6 months ago)
From
Javier Gorosabel at IAA-CSIC <jgu@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>
J. Gorosabel (IAA-CSIC), S. Eguchi (Univ. of Nagoya),
A.J. Castro-Tirado (IAA-CSIC), A. de Ugarte Postigo (IAA-CSIC),
P. Kilmartin (Univ. of Canterbury), P. Yock (Univ. of Auckland),
M. Jelínek (IAA-CSIC) and J.M. Castro Cerón (STScI) report:
"We have acquired two set of images of the GRB 040730 error box, provided
by INTEGRAL (Gotz et al. GCN 2634), with the 0.6 m telescope (+MOA camera)
at the Mt. John Observatory. The observations were performed with the MOA
broad R band filter (similar to Ic); individual exposure times were 300 s.
The two sets are composed of three images each (Texp = 3 x 300 s), the
first one taken on July 30.2992-30.3126 UT (t-to ~ 5.2 hr) and the second
one 30.5215-30.5349 UT (t-to ~ 10.7 hr). Visual comparison of the two
epochs did not reveal variable sources brighter than Ic ~ 20. We note
the severe Galactic extinction in the GRB line of sight (A_I ~ 2.3 mag)."
This message may be cited.
GCN Circular 2636
Subject
GRB 040730, infrared observations
Date
2004-08-02T16:12:03Z (21 years ago)
From
David Bersier at STScI <bersier@stsci.edu>
D. Bersier, J. Rhoads, A. Fruchter (STScI), A. Levan (U. of
Leicester), M. Albrecht (Bochum) and B. Reipurth (Hawaii) report on
behalf of a larger collaboration:
We have observed the field of GRB 040730 (Gotz et al., GCN 2634) with
the Infrared Side Port Imager (ISPI) on the CTIO Blanco-4m telescope,
starting 0.11d after the burst. We obtained several images on Jul 30
and Jul 31 UT in the J, H, and Ks bands. The 10' field of view was
centered on the GRB position and covering the whole error box (2').
We used an image subtraction technique to search for any variable object
in the Ks-band data. In this passband the foreground extinction is
approximately 0.4 magnitude. We find no variable object in our first
night data. Similarly, the comparison of the first and second night data
reveal no transient, to a limiting magnitude of approximately Ks=17.6 (5
sigma).