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Päiväysnäkymä Ketjunäkymä Aihenäkymä Kirjoittajanäkymä

Kirjoittajan mukaan: Arto Oksanen (arto.oksanen_at_hidden_email_address.net)
Päiväyksen mukaan: 02.05.2008


Alla NASAn gammapurkausverkoston kautta lähetetty raportti suomalaisharrastajien tekemistä havainnoista.

arto

 The following is a GCN Circular circulated via the AAVSO network.  For an archive and more information on circulars visit:  http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

 TITLE: GCN CIRCULAR
 NUMBER: 7657
 SUBJECT: GRB 080430 optical observations  DATE: 08/05/01 16:35:47 GMT
 FROM: AAVSO GRB Network at AAVSO <matthewt_at_aavso.org>

 Arto Oksanen (Muurame, Finland) and Veli-Pekka Hentunen (Varkaus, Finland)  report to the AAVSO High Energy Network the following optical observations  of GRB 080430 (Guidorzi et al., GCN Circular #7647):

 Arto Oksanen (Hankasalmi Obs., Hankasalmi, Finland) reports the detection  of the optical counterpart of GRB 080430. Unfiltered observations were  made using a 0.4-meter RC telescope with an SBIG STL-1001E CCD. The  initial Swift XRT position was observed unfiltered with an initial set of  10 60-second exposures having a mid-point time of 2008 April 30, 20:08:54  UT; the afterglow was detected with a magnitude of 18.1 +/- 0.05  calibrated relative to GSC 3450-0639. Astrometry of the initial frames  yields a position of RA 11:01:14.76 , Dec +51:41:08.9 (USNOA2.0 ref, +/-  0.4 arcseconds), which is within the stated uncertainties of the UVOT  position (GCNCirc #7647).

 Images taken between April 30.839 and April 30.969 UT were reanalyzed and  calibrated relative to two USNO-B1.0 stars of magnitude ~16.5. Photometry  of combined frames yields a smoothly decaying light curve during the span  of observations: 

    obs midpoint          CR    error
 2008 April 30.839       17.798  0.088
 2008 April 30.849       18.329  0.120
 2008 April 30.860       18.484  0.087
 2008 April 30.875       18.751  0.076
 2008 April 30.893       18.868  0.055
 2008 April 30.911       18.956  0.052
 2008 April 30.929       19.044  0.067
 2008 April 30.949       19.012  0.064
 2008 April 30.969       19.156  0.076

 A detailed report of the initial observations is available at the following URL:
 ftp://ftp.aavso.org/grb/A.Oksanen_GRB080430_2454587.38588_.txt

 A FITS image of this observation is available at the following URL:  ftp://ftp.aavso.org/grb/A.Oksanen_GRB080430_2454587.38588_.fits

 Markku Nissinen and Veli-Pekka Hentunen (Taurus Hill Observatory, Varkaus,  Finland) also report the detection of the optical afterglow of GRB 080430.  Observations were made using a Meade LX-200 0.3-meter telescope with an  SBIG ST8-XME CCD; observations were made using both clear and R filters.  A total of six 600-second exposures were obtained having an average  midpoint time of 2008 April 30.943. Photometry of the combined clear and  Rc frames yields magnitudes of CR=19.2+/-0.3 and R=19.5+/-0.5 calibrated  relative to the GSC2.3 star N7JI005540. The observers noted the sky was  not completely dark due to their high latitude and time of year.

 The AAVSO thanks the Curry Foundation for their continued support of the  AAVSO International High Energy Network.

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Päiväysnäkymä Ketjunäkymä Aihenäkymä Kirjoittajanäkymä