Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 32

GRB980326 optical observations
1998-03-28T17:56:00Z (26 years ago)
Paul Groot at U. of Amsterdam <>
P.J. Groot, P.M. Vreeswijk, T.J. Galama (University of Amsterdam); 
E. Pian, F. Frontera, E. Palazzi (CNR, Bologna); M. Feroci (CNR, Roma);
C. Kouveliotou and C. Robinson (USRA at NASA/MSFC) on behalf of the 
CTIO GRB collaboration; J. van Paradijs (U of Amsterdam and
U of Alabama in Huntsville); C. Tinney, Phillips, Driver, Smith,
Jones, Windridge (AAO); M. Keane, P. Hall, M. Smith (NOAO at CTIO);
J.F. Gonzalez, C. Lidman (ESO) report:
"Comparison of optical R-band observations of the error box of 
GRB980326 (IAUC 6851) taken at the AAT at Mar 27.42 UT (480s), 
the CTIO 4m-telescope at Mar 28.04 UT (600s) and the 
ESO 3.5m NTT at Mar 28.01 UT (ESO1, 600s) and Mar 28.17 UT 
(ESO2, 600s) shows a clearly variable object located at RA 08:36:34.28, 
Decl -18:51:23.9 (J2000).  Differential photometry with respect
to three local stars shows a decrease between the AAT and ESO1 
of 1.2(1) mag, AAT and CTIO of 1.6(1) mag and AAT and ESO2 of 1.7(1) mag. 
The three local standards have coordinate end-figures: 1) 36:35.41, 51:41.6; 
2) 36:31.00, 51:17.3; 3) 36:34.03, 50:53.2.  Their R-band magnitudes are: 
1) 18.4(1); 2) 21.7(1); 3) 20.3(1), as determined with respect to 
Landolt SA 98, no. 626, 624, 634, 590.  At the time of the AAT observation 
(Mar. 27.42 UT) the R-band magnitude of the variable was R=21.7, 
equal to that of comparison star 2. 
A finding chart of the variable can be found at:

This message is citeable."
Looking for U.S. government information and services? Visit