GRB 041016

K. Torii (Osaka University) reports:

 A part of the error region of GRB 041016 (HETE trigger 3578) was
observed with a remote telescope (0.30-m Cassegrain equipped with
FLI-IMG1024S CCD camera and clear filter) in the New Mexico Skies
observatory.  The observation started at 2004 October 16, 07:14 UT and
300-s integration was repeated. The observed field was 24x24
arcminutes centered at (R.A., Dec.) = (01 44 53, -04 17 14) (J2000).

 Preliminary comparison of the first 5 frames with the USNO-A2.0(R)
catalog does not show a new object brighter than ~16 mag.

===

S.Bodrov, A.Sankovich, 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 12h 22m  after  HETE GRB trigger time (alert 2019)   MASTER robotic
telescope (http://observ.pereplet.ru) had imaging  the corresponding area
of the sky under the good weather conditions.
The first image was started at 17h02m UT.
We did not find new stars up to 17m.

We have 20 unfiltered images of the error box (45s exposition, 2.4 x 2.4
degrees, 355 mm telescope, Alta U16 CCD camera).



Sum FITS image  are available at

http://observ.pereplet.ru/images/GRB041016/

This message may be cited.

J. Wren, W.T. Vestrand, P. Wozniak, R. White, report on behalf of the 
RAPTOR team.

Stereoscopic observations collected by the RAPTOR wide-field sky monitoring 
systems allow us to place optical limits on a prompt optical flash from GRB 
041016 (HETE trigger 3578).  The earliest images were 10 second exposures 
obtained starting at 04:40:13.3 UT (35 seconds after the GRB trigger) with 
a limiting magnitude of R ~ 13.1 mag.  When compared to our later follow-up 
images and sky patrol images taken earlier in the evening, no new or 
variable objects were detected (other than known 
asteroids).  Straightforward extrapolation of the light curve for prompt 
optical emission measured from GRB 021211, an event with approximately half 
the 25-300 keV fluence of GRB 041016, predicts an optical flux that exceeds 
these early flux limits.

D. Kuroda (Sokendai), K. Yanagisawa (OAO-NAOJ), and N. Kawai (Tokyo Tech)
report on behalf of a larger collaboration:

The entire error circle of GRB 041016 (=H3578) was observed with the
Tokyo Tech-OAO 50cm telescope equipped with the tricolor camera.  100
frames of 30 s exposure were taken simultaneously in V, R, and I bands
from 13:25 to 14:18 UT.  Visual comparison of the stacked image with
USNO-A2.0 (R) catalog reveals no new source with following upper
limits:

  V: 17.4
  R: 18.5
  I: 18.0.

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

 We have further analyzed the data reported in GCN #2813
Loading...
 
  and derived
the following limits on the optical afterglow of GRB 041016 (HETE
Trigger #3578). We made two pointings
and obtained 12 x 300-s frames for each pointing. The 12 frames from
each pointing was stacked to yield a single frame and compared with
the USNO-A2.0 (R) catalog. We found no new source brighter than the
limiting magnitude of each frame as given below.

 The first pointing (07:14 UT - 08:26 UT) 
was 24x24 arcmin field centered at 
(RA, Dec.) = (01 44 53, -04 17 12) (J2000). The limiting magnitude
of the stacked frame was 18.4.

 The second pointing (08:36 UT - 09:48 UT)
was 24x24 arcmin field centered at 
(RA, Dec.) = (01 44 48, -04 24 21) (J2000). 
The limiting magnitude of the stacked frame was 18.7.

 Starting at 11:54 UT on 2004 October 16, a part of the GRB 041016
error region was also observed at Osaka University with the 14-inch
telescope and unfiltered CCD. We stacked the first 60 frames of 60-s
exposure and compared it with the USNO-A2.0 (R) catalog. No new source
brighter than 18.2 mag was found in the 25x25 arcmin field centered at
(RA, Dec.) = (01 44 39, -04 12 13) (J2000).

===

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

"We have observed the field covering the error box of GRB041016
(HETE trigger 3578) with the unfiltered CCD camera on the 30-cm
telescope at University of Miyazaki.The ovservation was started
12:34:30 (UT) on Oct.16.Observed field of view is 43 arcmin centered on
R.A.=01h 45m 24.12s
Dec.=-04d 39' 29.3".
 After co-adding a set of 8 images of 30 sec exposures,we have
compared our images with the USNO A2.0 catalog.Preliminary analysis
shows there is no new source brighter than 18.1mag. in the WXM
error box reported by HETE ."

M. Jelínek, A. J. Castro-Tirado, A. de Ugarte Postigo,
(IAA-CSIC Granada), S. Vitek (Czech Technical University, 
Prague), P. Kubanek  (Astronomical Institute of the Academy 
of Sciences, Ondrejov), T. J. Mateo Sanguino (University of 
Huelva),T. Soria (EELM-CSIC, Málaga) and J. Fabregat
(University of Valencia)

report:
 
The BOOTES-2 very wide field camera located at the Estación
Experimental de La Mayora (EELM-CSIC) in Málaga observed 
the region of the sky containing the WXM error box for GRB 
041016 (HETE trigger 3578) as part of the routinary observing 
schedule. The field was not observed at optimum conditions
(air airmass, cirruses). A 30s exposure started at 4:40:00 
UT (20.5s after beginning of the 33s long burst), i.e. covering 
the last 12.5s of the burst's gamma ray activity. This image, 
sets a R = 7.0 upper limit to the promt optical flash for GRB
041016.

This message can be quoted.