1999ApJ...511..298V

Query : 1999ApJ...511..298V

1999ApJ...511..298V - Astrophys. J., 511, 298-303 (1999/January-3)

The optical contents of the IPN1 localization of GRB 790325b: the discovery of a probable QSO association.

VRBA F.J., LUGINBUHL C.B., JENNINGS M.C. and HARTMANN D.H.

Abstract (from CDS):

We report the results of the deepest imaging survey yet carried out of the IPN1 localization of gamma-ray burst (GRB) 790325b. While this is one of the smallest of the IPN1 GRB localizations, it has been previously surveyed only to shallow limits because of the nearby bright (V=4.97) star 104 Herculis. We have used a camera with a 9 mag neutral density region in front of a Tek 20482 CCD to apodize the light of 104 Her and allow deep UBVI imaging of the localization. The observations, obtained at the US Naval Observatory 1.55 m telescope to a detection limit of V~22.9, reveal 20 objects clearly within or at the edge of the localization. Near the center of the localization is a QSO candidate that is unlikely (~97% confidence) to be a random occurrence based on known QSO statistics. Combining these new statistics with earlier summed statistics linking QSOs/blue galaxies with IPN1 localizations yields a marginal (~96% confidence) overall correlation. We also compare our observational results for this field with another recent imaging survey of GRB 790325b based on HST data and discuss the differences in the results.

Abstract Copyright: ∼

Journal keyword(s): Gamma Rays: Bursts - Gamma Rays: Observations

Nomenclature: Table 1: [VLJ99] NNN N=20 among (Nos 58-143).

CDS comments: Table 1: cross-id. (A) = [SCH97c] GRB 790325 A

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 GRB 970228 gB 05 01 46.7 +11 46 53           ~ 650 1
2 GRB 970508 gB 06 53 49.2 +79 16 19           ~ 883 1
3 GRB 980326 gB 08 36 34.3 -18 51 24           ~ 268 0
4 GRB 971214 gB 11 56 26.4 +65 12 01           ~ 445 1
5 GRB 790325 gB 18 11 +31.4           ~ 39 1
6 * 104 Her V* 18 11 54.1566238248 +31 24 19.256317416 8.56 6.62 4.97     M3III 127 0
7 [SCH97c] GRB 790325 I Q? ~ ~   21.17       ~ 3 0
8 [SCH97c] GRB 790325 J ? ~ ~   20.67       ~ 3 0
9 [VLJ99] 62 ? ~ ~   22.61 21.26     ~ 1 0
10 [VLJ99] 78 ? ~ ~     21.86     ~ 1 0
11 [VLJ99] 88 ? ~ ~   22.87 21.33     ~ 1 0
12 [VLJ99] 103 ? ~ ~     21.92     ~ 1 0
13 [VLJ99] 104 ? ~ ~   22.39 21.11     ~ 1 0
14 [SCH97c] GRB 790325 A * ~ ~   13.75 13.11     G 3 0
15 [VLJ99] 114 ? ~ ~   21.67 20.61     ~ 1 0
16 [VLJ99] 118 ? ~ ~   22.69 21.19     ~ 1 0
17 [VLJ99] 133 ? ~ ~   22.00 20.56     ~ 1 0
18 [VLJ99] 135 ? ~ ~     21.41     ~ 1 0
19 [VLJ99] 139 ? ~ ~   22.23 21.34     ~ 1 0
20 [VLJ99] 143 ? ~ ~   22.36 20.82     ~ 1 0
21 [VLJ99] 106 ? ~ ~   16.98 16.10     ~ 1 0
22 [SCH97c] GRB 790325 B ? ~ ~   19.42       ~ 3 0
23 [SCH97c] GRB 790325 C ? ~ ~   21.16       ~ 3 0
24 [SCH97c] GRB 790325 D G ~ ~   22.52       ~ 3 0
25 [SCH97c] GRB 790325 E ? ~ ~   18.92       ~ 3 0
26 [SCH97c] GRB 790325 F ? ~ ~   20.83       ~ 3 0

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