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GCN Circular 2390

Subject
GRB030913: AAVSO optical observations
Date
2003-09-19T19:09:12Z (21 years ago)
From
Arto Oksanen at Nyrola Obs., Finland <oksanen@nyrola.jklsirius.fi>
Arto Oksanen, Arne Henden, Cristovao Jacques, Andrea Tasselli, 
Odd Trondal, Michel Bonnardeau and Bruce Gary report on 
behalf of the AAVSO International High Energy Network:

We have observed the GRB030913 (=H2849) error circle starting 
September 13, 2003 18:56 UT, less than 2 hours from the burst. 
The revised error circle (Donaghy et al., GCN 2388), was covered 
completly by several observers.  

The earlier larger error circle (M. Suzuki et al., GCN 2383) was 
covered by 90 percent in 7.9 hours.
 
All images vere visually checked and most images were also checked 
by software against USNOA2.0 and USNOB1.0 catalogs to detect any 
optical transients. 

No new objects were found to the image limits. At 2.85 hrs after 
the burst, no afterglow was detected to R=18 (defined by images 
marked with stars on the following summary).

Summary of all observations:

                    total    image center   limiting  from
    mid UT        exposure  RA (J200.0) DEC  mag (R) burst(h) obs
-----------------------------------------------------------------
2003-09-13T18:56    20x10s  20 58 11 -02 17    15.5   1.83    OT 
2003-09-13T19:13     6x60s  20 58 38 -01 57    18.0   2.10    AO *
2003-09-13T19:21     6x60s  20 57 15 -02 00    18.0   2.23    AO *
2003-09-13T19:29     6x60s  20 58 44 -02 12    18.0   2.37    AO *
2003-09-13T19:37     6x60s  20 57 23 -02 14    18.0   2.50    AO *
2003-09-13T19:49     6x60s  20 59 01 -02 20    18.0   2.70    AO *
2003-09-13T19:58     6x60s  20 57 39 -02 22    18.0   2.85    AO *
2003-09-13T20:53     6x60s  20 58 49 -01 53    17.5   3.77    AO
2003-09-13T21:05     6x60s  20 57 11 -02 00    17.5   3.97    AO
2003-09-13T21:15     6x60s  20 58 45 -02 12    17.5   4.13    AO
2003-09-13T21:23     6x60s  20 57 21 -02 14    17.0   4.27    AO
2003-09-13T21:30    42x60s  20 57 49 -02 22    18.0   4.39    AT 
2003-09-13T21:31     6x60s  20 58 51 -02 26    17.5   4.40    AO
2003-09-13T21:39     6x60s  20 57 26 -02 29    17.5   4.53    AO
2003-09-13T22:26    10x45s  20 57 50 -02 14    18.0   5.32    CJ 
2003-09-13T22:38    10x45s  20 57 49 -01 59    18.0   5.52    CJ
2003-09-13T22:50    10x45s  20 57 55 -02 32    18.0   5.72    CJ
2003-09-13T23:38     6x45s  20 56 32 -02 17    17.5   6.52    CJ
2003-09-13T23:50     4x45s  20 56 29 -02 01    17.5   6.43    CJ
2003-09-14T00:24     4x45s  20 59 14 -02 14    17.5   7.28    CJ
2003-09-16T02:40    18x60s  20 58 02 -02 12    20.3  57.53    BG
2003-09-17T03:55    8x900s  20 58 06 -02 35    22.7  82.82    AH
-----------------------------------------------------------------

Observer details:

AO: Arto Oksanen, Finland
    FOV: 24 x 16 arc min 
    Equipment: 0.40m SCT f/5.0, ST8XE CCD, Rc-filter

OT: Odd Trondal, Norway
    FOV: 20 x 15 arc min
    Equipment: 0.25 m f5.75, MX916 CCD, R-filter

CJ: Cristovao Jacques, Brazil
    FOV: 25 x 17 arc min 
    Equipment: 0.30m SCT f/3.0 , ST7E CCD, unfiltered

BG: Bruce Gary, Arizona, U.S.A.
    FOV: 23 x 15 arc min
    Equipment: 0.35 m SCT, AO-7 stabilizer, ST-8XE CCD, unfiltered 

AT: Andrea Tasselli, UK
    FOV: 16 x 22 arc min
    Equipment: 0.15 m Maksutov Cassegrain f/7, MX716 CCD

AH: Arne Henden, Arizona, U.S.A.
    FOV: 11 x 11 arcmin
    Equipment: 1.0m, CCD, R-filter


The AAVSO International High Energy network is grateful for a 
generous grant from the Curry Foundation and to NASA for the 
financial support for the High Energy Workshops for Amateur 
Astronomers.
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