GRB 040825A

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, Alexsandr Krylov Observatory, Moscow

At 16.8h after  HETE alert 11553  MASTER robotic telescope
(http://observ.pereplet.ru) had imaging  the corresponding area of the sky.

We have 60 unfiltered images of the error box (60s exposition, 40 x 50
arcmin, 200 mm camera).

The unfiltered optical limit on sum is about 20m.

The visual comparison between these images with the DSS plate does not
reveal any new source.


Sum FITS image  are available at
http://observ.pereplet.ru/images/GRB040825a/

This message may be cited.

P. Tristram (Univ. of Canterbury, New Zealand), 
A. de Ugarte Postigo, J. Gorosabel, A.J. Castro-Tirado, 
M. Jelinek (IAA-CSIC, Granada, Spain),
J.M. Castro Cerón (STScI, Baltimore, USA)
Ph. Yock (Univ. of Auckland, New Zealand),
report:

 "We have imaged the entire GRB 040825A error box 
 provided by HETE-2 (trigger # 11553) with the 0.6-m  
 telescope (+MOA camera) at Mt.John Observatory as 
 follows:
  

  Date of Aug.    Exp.Time   Error box     Lim. Mag.
   2004 UT          (s)      coverage (%)  (3 sigma)
 ---------------------------------------------------
  25.4028-25.4346  4x300     ~75(North)     R~21.1
  25.5292-25.5426  2x300     ~25(South)     R~20.7
 ---------------------------------------------------

 Observations were performed with the MOA broad R-band 
 filter (similar to Ic). Apart from several slow moving 
 sources, visual comparison of the stacked image with 
 the DSS-2 plates revealed no variable source."

This message may be cited.

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A. Piccioni, C. Bartolini, A. Guarnieri, G. Greco (Bologna University),
P. Ferrero (IASF-CNR, Bologna; Osservatorio e Universita' di Teramo),
G. Pizzichini (IASF-CNR, Sezione di Bologna), F. Giovannelli(IASF-CNR,
Sezione di Roma) and R. Gualandi (Osservatorio di Bologna) report:

We observed the error box of GRB040825A (HETE Ground Analysis, trigger
11553) with the 152 cm Loiano Telescope and the BFOSC camera system in
non optimal sky conditions (seeing approximately 3.5 arcsec).
We obtained 10X300s images with a filter Rc at UT mean = 26.03516.
The magnitude limit, estimated by comparison with USNO A2 catalog, is
approximately 19.5.
By comparison of the coadded images with the corresponding DSS plate
we did not find any obvious OT source, but in our field we detected
2 moving objects.
The coadded images and the observation log will be posted in our
public directory from where it will be possible to retrieve by sftp
using hostname: ermione.bo.astro.it, username: publicGRB, password:
GRB_bo, directory: GRB040825A.

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


We have observed the WXM error box of
GRB040825A(HETE trigger 11553)
with the  unfiltered CCD camera on the 30-cm telescope at University of
Miyazaki.
Observed field of view is 43 arcmin centerd on (22h 59m 23s -11d 07' 44").
We have compared our images with the USNO A2.0 catalog.
There is no new source brighter than 16.8 mag.in our observed field
at 12:45:08 UT.

A. Henden (USRA/USNO) reports on behalf of the USNO GRB team:

We have acquired BVRcIc all-sky photometry for
a 11x11 arcmin field centered on the HETE coordinates
(trigger 11553) for GRB040825A
with the USNOFS 1.0-m telescope on one photometric night.
Stars brighter than V=13.5 are saturated and
should be used with care.  We have placed the photometric data
on our anonymous ftp site:
ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb040825a.dat
The astrometry in this file is based on linear plate solutions
with respect to UCAC2.  The external errors are less than 100mas.
The estimated external photometric error is about 0.03mag
and will be improved with additional calibration nights
if an afterglow is discovered.

As always, you should check the dates on the .dat file prior to
final publication to get the latest photometry.  There is
a README file on the ftp directory to give you information
about the procedures used to calibrate these fields.

M.Cwiok, L.Mankiewicz, K.Nawrocki, B.Pilecki, L.W.Piotrowski,
G.Pojmanski, R.Salanski, M.Sokolowski, D.Szczygiel, G.Wrochna,
on behalf of "Pi of the Sky / ASAS" collaboration

The central part of HETE FOV containing GRB040825A error box
was observed by "Pi of the Sky" apparatus (http://grb.fuw.edu.pl)
at Las Campanas Observatory for the night of 2004.08.25
from 2:24 UT (1 h 6 min before the GRB)
till 9:35 UT (6 h 4 min after the GRB).

10s exposures were taken continuously with 4s intervals
by two CCD cameras. The single frame limiting magnitude
was strongly varying, due to thin clouds covering the sky.
No OT and no unknown objects have been observed within
the GRB040825A error box.

Preliminary limits for frames PRECEDING, CONTAINING and following
the GRB are 10m, 10m, and 9.5m respectively.

We are working on better limits for integrated frames.
More details can be found at
http://grb.fuw.edu.pl/pi/ot/grb040825a/
-- 
  _____________________________________________________
|                                                     |
| dr hab. Grzegorz Wrochna     http://cern.ch/wrochna |
| Soltan Institute for Nuclear Studies                |
| Hoza 69                  e-mail: wrochna@fuw.edu.pl |
| PL 00-681 Warsaw              tel: +48 22 628 18 93 |
| Poland                        fax: +48 22 621 28 04 |
|_____________________________________________________|

Brian L. Jensen (U. Copenhagen), Arnaud Cassan (IAP, Paris), Dijana
Dominis (U. Potsdam), Jens Hjorth, Johan Fynbo (U. Copenhagen), Michael
I. Andersen (AIP, Potsdam), Javier Gorosabel (IAA-CSIC, Granada) report:

"We report optical observations, covering ~90% of the refined 7'
error-circle (HETE#11553-2) of GRB040825A, taken with the Danish 1.54m
telescope at La Silla (FoV=13.7'), as follows:

Date midobs (UT) | t_b+  | filter:expt | seeing | 3sig limit
------------------------------------------------------------
Aug. 26.30, 2004   27.7h    R:14x600s     ~1.1"     R~23.5
Aug. 26.31, 2004   27.9h    V:12x600s     ~1.4"     V~23.3
Aug. 27.31, 2004   51.9h    R:18x600s     ~1.5"     R~23.0
Aug. 28.28, 2004   75.2h    I:13x300s     ~2.1"     I~21.0

Photometric calibration is based on Henden et al. (GCN#2668
Loading...
 
 ).

Visual comparison of the three main epochs reveals no candidate optical
afterglow down to R~23.0"

[GCN OPS NOTE (02Sep04 11:15 UT): The second column (t_b+) of the table
had a wrong offset in the original posting (should have been 12.8h larger).
This archived copy of the circular has the corrected t_b+ values.]

Brian L. Jensen (U. Copenhagen), Arnaud Cassan (IAP, Paris), Dijana
Dominis (U. Potsdam), Jens Hjorth, Johan Fynbo (U. Copenhagen), Michael
I. Andersen (AIP, Potsdam), Javier Gorosabel (IAA-CSIC, Granada) report:

"We report optical observations, covering ~90% of the refined 7'
error-circle (HETE#11553-2) of GRB040825A, taken with the Danish 1.54m
telescope at La Silla (FoV=13.7'), as follows:

Date midobs (UT) | t_b+  | filter:expt | seeing | 3sig limit
------------------------------------------------------------
Aug. 26.30, 2004   14.9h    R:14x600s     ~1.1"     R~23.5
Aug. 26.31, 2004   15.1h    V:12x600s     ~1.4"     V~23.3
Aug. 27.31, 2004   39.1h    R:18x600s     ~1.5"     R~23.0
Aug. 28.28, 2004   62.4h    I:13x300s     ~2.1"     I~21.0

Photometric calibration is based on Henden et al. (GCN#2668
Loading...
 
 ).

Visual comparison of the three main epochs reveals no candidate optical
afterglow down to R~23.0"