GCN Circular 4837
Subject
GRB 060218/SN 2006aj, SMARTS optical/IR observations
Date
2006-02-26T18:43:22Z (19 years ago)
From
Bethany Cobb at Yale U <cobb@astro.yale.edu>
B. E. Cobb and C. D. Bailyn (Yale), part of the larger SMARTS
consortium, report:
Using the ANDICAM instrument on the 1.3m telescope at CTIO, we
obtained optical/IR imaging of the position of GRB 060218/SN 2006aj
(GCN 4775, Cusumano et al.) over 5 nights. Total summed exposure time
on each night amounted to 36 minutes in I and 30 minutes in J.
The object shows continued brightening over our images. The preliminary
I magnitude of the object on 2006-02-22 is calculated based
on contemporaneous observations of Landolt RU149. The preliminary J
magnitude on the same day is calculated in comparison to 2MASS
stars in the field.
Mid-Exposure
UT Date and Time
2006-02-22 00:35 I = 17.58 +/- 0.05 J = 17.31 +/- 0.05
I mag relative to 1st epoch J mag relative to 1st epoch
2006-02-23 00:27 -0.18 +/- 0.02 -0.11 +/- 0.05
2006-02-24 00:20 -0.29 +/- 0.02 -0.24 +/- 0.05
2006-02-25 00:16 -0.39 +/- 0.02 -0.28 +/- 0.05
2006-02-26 00:18 -0.46 +/- 0.02 -0.38 +/- 0.05