GCN Circular 1416
Subject
GRB020531 Optical Observations
Event
Date
2002-06-07T01:16:18Z (24 years ago)
From
Don Lamb at U.Chicago <lamb@oddjob.uchicago.edu>
A. Miceli, D. Q. Lamb, D. Zucker, K. Covey, J. Dembicky, and N. C.
Hastings report:
We have observed the field of GRB020531 (=H2042) (Ricker et al., GCN
1399) using the SPIcam (4.78' x 4.78' field of view) on the ARC
3.5-meter telescope at APO under clear skies and a bright moon on UTC
2002 June 1 from 07:27:53 to 07:43:05 UTC (beginning 1.3 days after the
burst), and under mostly clear skies but poor seeing on UTC 2002 June 6
from 04:38:33 to 04:54:22 UTC (beginning 7.2 days after the burst).
On both nights we took three 400-second r'-band exposures that cover
the entire refined hexagonal IPN error region for GRB020531 (Hurley et
al., GCN 1407). We have examined these images in the vicinity of the
ten X-ray sources seen in the first Chandra follow-up observation that
lie inside the refined IPN error region and the three bright X-ray
sources that lie just outside the refined IPN error region (Ricker et
al., GCN 1415). The table below lists the approximate r* magnitude or
the approximate limiting r* magnitude of any object that lies at the
location of these thirteen X-ray sources, based on a preliminary
analysis of a single r'-band image taken on each night. SPIcam RMS
astrometric errors are 0.2 arcsec or less.
---------------------------------------------------------------------------
Nearest
X-ray Optical RA Dec r* mag r* mag Comment
Source Source (deg) (deg) (June 1) (June 6)
---------------------------------------------------------------------------
cxo00 arc00 228.8139 -19.4194 --- 20.6 Outside June 1 FOV
cxo05 mag05 ----- ----- > 22.5 > 22.0 Magellan R ~ 23.6
cxo15 arc15 228.7431 -19.3892 20.7 20.7
cxo28 --- ----- ----- > 22.5 > 22.0
cxo36 --- ----- ----- > 22.5 > 22.0
cxo41 --- ----- ----- > 22.5 > 22.0
cxo47 --- ----- ----- > 22.5 > 22.0
cxo48 --- ----- ----- > 22.5 > 22.0
cxo51 --- ----- ----- > 22.5 > 22.0
cxo52 --- ----- ----- > 22.5 > 22.0
cxo55 arc55 228.7374 -19.4107 22.3 --- Outside June 6 FOV
cxo56 arc56 228.8091 -19.4073 20.5 20.5
cxo58 --- ----- ----- > 22.5 > 22.0
---------------------------------------------------------------------------
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