GRB 041015

S. Mereghetti, D. Gotz (IASF, Milano), M.Beck, S.Shaw, N.Mowlavi (ISDC),
J.Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report

A faint, 30 s long GRB has been detected with the INTEGRAL Burst Alert System
(IBAS) on October 15  at 11:11:30 UT. The GRB has been detected with
IBIS/ISGRI in the 15-200 keV band but with a significance below the
threshold for automatic delivery of the IBAS Alert Packets.

Its coordinates (J2000)  are:

R.A. =   0h   18m 37s
Dec. = +66d   51' 37''

with an uncertainty of 3 arcmin  (90% c.l. radius)

The preliminary analysis indicates a peak flux of 0.2 photons/cm2/s
(3.6e-8 erg/cm2/s) in the 20-200 keV range (1 sec integration)

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T. Mizuno, Y. Arai, F. Sato (Tokyo Gakugei Univ), 
M. Isogai and Y. Urata on behalf on Kiso GRB team report:

" We have observed the entire INTEGRAL error circle of GRB041015
(S. Mereghetti et al., GCN 2805
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 ) with the Kiso observatory 1.05
Schmidt telescope started at 13:40 UT (0.10255 days after the burst).
We obtained six R-band images with 300 sec exposure. The upper limit
is about R~21 mag. estimated from several USNO-B1.0
catalogue. Comparison with DSS II red image, we can not find new
objects brighter than the limit of DSS image."

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K. Torii and Yuuichi Fukazawa (Osaka University)
report:

 The entire error region of GRB 041015 (Mereghetti, et al., GCN 2805
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 )
was observed with the 14-inch Automated Response Telescope at Osaka
University. The observation started at 2004 October 15 13:08:48
UT (59-s after the IBAS packet time) and 60-s integration was repeated.

 We stacked 20 unfiltered images obtained between 13:10 and 13:31 UT
and compared it with the USNO-A2.0(R) catalog. No new source brighter
than R~17.7 mag was identified.

===

E.Sonoda,S.Maeno,Y.Matsuo,M.Yamauchi
(University of Miyazaki)

"We have observed the field covering the error box of GRB041015
(INTEGRAL trigger 2019) with the unfiltered CCD camera on the 
30-cm telescope at University of Miyazaki.The observation was 
started 16:14:19 UT on Oct.15.
 Observed field of view is 43 arcmin centered on R.A.=00h 19m 30.97s
Dec.=+66d 40' 32.1".
 We have compared our images with the USNO A2.0 catalog.Preliminary
analysis shows there is no new source brighter than 17.3mag. in the
GRB error box reported by S.Mereghetti et al.(GCN2805
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 )."

V. Lipunov, A.Krylov, V.Kornilov, G.Borisov, D.Kuvshinov, A.Belinski,
M.Kuznetsov,  S.Potanin, G.Antipov, E.Gorbovskoy, N.Tyurina
Sternberg Astronomical Institute, Alexandr Krylov Observatory, Moscow

At 4h 15m  after  INTEGRAL GRB trigger time (alert 2019)   MASTER robotic
telescope (http://observ.pereplet.ru) had imaging  the corresponding area
of the sky under the nice weather conditions.
The first image was started at 15h23m UT.

We have 20 unfiltered images of the error box (30s exposition, 2.4 x 2.4
degrees, 355 mm telescope, Alta U16 CCD camera).
We can not find new stars with respect to DSS2 red images (R<21m).



Sum FITS image  are available at

http://observ.pereplet.ru/images/GRB041015/

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Kuntal Misra and S. B. Pandey (ARIES NainiTal), on behalf of                                
larger Indian GRB collaboration                              

We observed the GRB 041015 field (INTEGRAL trigger 2019) with 1.04m 
reflector at ARIES NainiTal, starting at Oct 15.6424 UT. Co-added 
R_c frame (2 x 900 sec) did not reveal any new source within 
error-box upto ~ 20 mag, in comparison with nearby USNO-A2.0 stars.  
 
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Takuya Murata (Rikubetsu Astronomical Observatory) 
and K. Torii (Osaka U.)
report:

 The entire error region of GRB 041015 (Mereghetti, et al., GCN 2805
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 )
was observed with the 1.15-m Rikuri telescope of the 
Rikubetsu Astronomical Observatory, Hokkaido, Japan.

 7 x 60-s and 1 x 300-s unfiltered frames were obtained between 2004
Oct. 15, 14:37 UT and 16:39 UT. Comparison of the first 60-s frame
with the DSS2 red frame does not reveal a new source brighter than
about 20.0 mag (USNO-A2.0 R).

===

M. Isogai(Tokyo Univ.), T. Mizuno, Y. Arai, F. Sato(Tokyo Gakugei Unive.),
Y. Urata, T. Tamagawa(RIKEN), K.Y Huang(NCU), 
on behalf of an east Asian collaboration report:
 
" We have carried out R-band imaging observation for the entire
INTEGRAL error region (S. Mereghetti et al., GCN 2805
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 ) at Kiso
observatory. We have obtained totally 9 R-band images with 300 sec
exposures started at 15.558 UT (0.103 days after the burst, Mizuno et
al., GCN2806
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 ) and 15.782 UT (0.327 days after the burst). Comparing
with two epoch our data, there is no variable source down to R~
21.9. The upper limit is estimated from several USNO-B1.0 catalogue
stars."

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V.Rumyantsev (CrAO), V.Biryukov (SAI, MSU),  A.Pozanenko (IKI) report:

We have observed the error box of GRB041015 (INTEGRAL trigger 2019) with
2.6m telescope of Crimean Astrophysical Observatory. Six  R-band images with
120 sec exposure were taken between (UT) Oct.16 21:25 - 21:38 under moderate
weather conditions. The observed fields was 2.4x1.6  arcminutes centered at
the error box. The upper limit of combined image is R~22.0 mag. as estimated
from several stars  USNO-A2.0 catalog. Comparison with DSS2  red plate does
not reveal any new objects brighter than ~20 mag.

The combined image is available at http://grb.rssi.ru/GRB041015/

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K. Kinugasa and E. Nishihara (Gunma Astronomical Observatory) report:

 The entire INTEGRAL error circle of GRB041015 (S. Mereghetti et al., 
GCN 2805
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 ) was observed in J-, H-, and Ks-band with the 1.5-m telescope 
and the IR Camera at Gunma Astronomical Observatory, Gunma, Japan.
The observation started at 13:53:15 UT (162 min after the burst) 
on the night of 2004 October 15.

 We stacked 20 x 10-s J-band, 50 x 5-s H-band, and 50 x 5-s Ks-band 
frames and compared them with 2MASS JHKs images. We found no new source 
brighter than J=16.6, H=16.0, and Ks=15.6, which are near the limits of 
2MASS catalog. 

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