GRB 000508B: Optical Observations 

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  670
SUBJECT: GRB 000508B: Optical Observations
DATE:    00/05/16 21:54:56 GMT

B. L. Jensen, H. Pedersen, J. Hjorth (U. of Copenhagen),

J. P. U. Fynbo (U. of Aarhus/ESO),
J. Gorosabel, N. Lund (DSRI,Copenhagen),
H. Kjeldsen, F. Grundahl (U. of Aarhus),
C. Zurita, J. Casares (IAC,Tenerife),
C. Sanchez-Fernandez and A.J. Castro-Tirado (LAEFF, Madrid)
report on behalf of a larger European GRB collaboration:

"We have obtained images of the RXTE/IPN-errorbox reported by Smith et al. (#665) with the 2.56-m Nordic Optical Telescope (NOT+ALFOSC) on La Palma, and the 1.54-m Danish Telescope (DK-1.54m+DFOSC) at La Silla, as follows: 


Telescope      Date               Filter   Exp time   FWHM
NOT       2000 May 10.14 UT (t+32h); I:5x300s; FWHM=0.8"
DK-1.54m  2000 May 10.17 UT (t+33h); R:3x420s; FWHM=1.5"
DK-1.54m  2000 May 10.38 UT (t+38h); R:3x420s; FWHM=1.5"
DK-1.54m  2000 May 12.25 UT (t+83h); R:4x420s; FWHM=1.3"

We have visually compared the combined May 10 2520s R-band image with red POSS-II exposure. The three sets of May 10 images have been compared internally, both visually and using automated routines based on DAOPHOT II/ALLSTAR PSF-photometry. Additionally, we have compared the combined May 10 and May 12 R-band images, visually and through automated routines. We do not, in any of the comparisons, find any significantly variable objects down to a 3-sigma mag limit of R~22.5. We do not find significant variability in the objects noted by Stanek et al. (GCN #668). An image of the error-box is posted at http://www.astro.ku.dk/~brian_j/grb/grb000508B "

 

(click for larger image)

 

Last updated on March 28 2000, by Brian Lindgren Jensen