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 3535

GRB 050607: PROMPT VRcIc Observations
2005-06-08T00:25:17Z (19 years ago)
Melissa Nysewander at UNC,Chapel Hill <>
M. Nysewander, D. Reichart, J. A. Crain, A. Foster, M. Bayliss report on
behalf of the UNC team of the FUN GRB Collaboration:

We observed the BAT localization of GRB 050607 (Retter et al., GCN 3525)
with PROMPT beginning 13m 30s after the burst.

We do not detect a source within the refined XRT localization (Pagani et
al., GCN 3528) nor the source identified by Rhoads (GCN 3527).

3-sigma limiting magnitudes are based on 10 USNO-B1.0 stars for Rc and Ic
observations and 10 NOMAD stars for V observations.  Initial limiting
magnitudes are poor due to a camera cooling error:

Mean Time	Integration 	Filter	Limiting	Telescope
Since GRB	Time			Magnitude

14m 08s		1 x 77.5s	Ic	17.5		PROMPT-5
17m 43s		2 x 77.5s	V	18.4		PROMPT-5
21m 16m		1 x 77.5s	Rc	19.7		PROMPT-5
24m 06s		1 x 77.5s	Ic	19.2		PROMPT-5
26m 21s		2 x 77.5s	V	19.5		PROMPT-5
29m 51s		3 x 76.25s	Rc	20.5		PROMPT-5
36m 17s		4 x 76.25s	Ic	20.2		PROMPT-5
41m 48s		3 x 76.25s	V	19.4		PROMPT-5
47m 17s		2 x 76.25s	Rc	20.3		PROMPT-5
51m 25s		1 x 76.25s	Ic	19.4		PROMPT-5

Stacking all images yields 3-sigma limiting magnitudes of Ic > 20.5, Rc >
21.2, and V > 19.8.

PROMPT is still being built and commissioned.
Looking for U.S. government information and services? Visit