TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1098 SUBJECT: GRB 010921 DPOSS Images Available DATE: 01/09/22 03:00:24 GMT FROM: Derek Fox at CIT A. Mahabal, S. G. Djorgovski, and R. Brunner of the Caltech DPOSS group, with D. W. Fox and P. A. Price of the Caltech-NRAO-CARA GRB collaboration, report: "We have made Digital Palomar Observatory Sky Survey (DPOSS) images of the GRB 010921 error box (GCN #1097) publicly available through the React Group webpages at: http://www.srl.caltech.edu/~react/GRB010921.html The images may also be accessed directly as: http://www.srl.caltech.edu/~react/fits/GRB010921j.fits http://www.srl.caltech.edu/~react/fits/GRB010921f.fits http://www.srl.caltech.edu/~react/fits/GRB010921n.fits The images are 1801x1801 pixels, centered at (J2000) RA 22:55:34.86, Dec +40:56:32.1, and covering 30'x30'. The images are from the second Palomar Sky Survey and were digitized at STScI; they have subsequently been corrected for vignetting effects and have corrected astrometric coefficients in the image headers. Note that the image bandpasses are green (j), red (f), and near-infrared (n), corresponding, respectively, to the IIIa-J, IIIa-F, and IV-N emulsions used in the survey. Going forward, we hope to make DPOSS images of GRB fields in the northern hemisphere available on a regular basis. Please contact Ashish Mahabal or one of the other authors of the Circular if you have any questions."