1999ApJ...524L.103S

Query : 1999ApJ...524L.103S

1999ApJ...524L.103S - Astrophys. J., 524, L103-L106 (1999/October-3)

Discovery of the optical transient of GRB 990308.

SCHAEFER B.E., SNYDER J.A., HERNANDEZ J., ROSCHERR B., DENG M., ELLMAN N., BAILYN C., RENGSTORF A., SMITH D., LEVINE A., BARTHELMY S., BUTTERWORTH P., HURLEY K., CLINE T., MEEGAN C., KOUVELIOTOU C., KIPPEN R.M., PARK H.-S., WILLIAMS G.G., PORRATA R., BIONTA R., HARTMANN D., BAND D., FRAIL D., KULKARNI S., BLOOM J., DJORGOVSKI S., SADAVA D., CHAFFEE F., HARRIS F., ABAD C., ADAMS B., ANDREWS P., BALTAY C., BONGIOVANNI A., BRICENO C., BRUZUAL G., COPPI P., DELLA PRUGNA F., DUBUC A., EMMET W., FERRIN I., FUENMAYOR F., GEBHARD M., HERRERA D., HONEYCUTT K., MAGRIS G., MATEU J., MUFFSON S., MUSSER J., NARANJO O., OEMLER A., PACHECO R., PAREDES G., RENGEL M., ROMERO L., ROSENZWEIG P., SABBEY C., SANCHEZ G., SANCHEZ G., SCHENNER H., SHIN J., SINNOTT J., SOFIA S., STOCK J., SUAREZ J., TELLERIA D., VICENTE B., VIEIRA K. and VIVAS K.

Abstract (from CDS):

The optical transient of the faint gamma-ray burst GRB 990308 was detected by the QUEST camera on the Venezuelan 1 m Schmidt telescope starting 3.28 hr after the burst. Our photometry gives V=18.32±0.07, R=18.14±0.06, B=18.65±0.23, and R=18.22±0.05 for times ranging from 3.28 to 3.47 hr after the burst. The colors correspond to a spectral slope of close to fν∝ν1/3. Within the standard synchrotron fireball model, this requires that the external medium be less dense than 104 cm–3, the electrons contain more than 20% of the shock energy, and the magnetic field energy be less than 24% of the energy in the electrons for normal interstellar or circumstellar densities. We also report upper limits of V>12.0 at 132 s (with LOTIS), V>13.4 from 132 to 1029 s (with LOTIS), V>15.3 at 28.2 minutes (with Super-LOTIS), and a 8.5 GHz flux of less than 114 µJy at 110 days (with the Very Large Array). Wisconsin-Indiana-Yale-NOAO 3.5 m and Keck 10 m telescopes reveal this location to be empty of any host galaxy to R>25.7 and K>23.3. The lack of a host galaxy likely implies that it is either substantially subluminous or more distant than a redshift of ∼1.2.

Abstract Copyright: ∼

Journal keyword(s): Gamma Rays: Bursts

Nomenclature: Fig.1: [SSH99] Star N (Nos 1, 6).

Simbad objects: 11

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Number of rows : 11
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 980613 gB 10 17 57.8 +71 27 26           ~ 204 1
4 GRB 971214 gB 11 56 26.4 +65 12 01           ~ 445 1
5 USNO-A2.0 0900-07139047 * 12 23 10.8026543592 +06 43 20.204979708   18.40 17.63     ~ 1 0
6 2MASS J12231118+0645384 * 12 23 11.1936580008 +06 45 38.246450832   14.75 13.94     ~ 3 0
7 GRB 990308 gB 12 23 11.44 +06 44 05.1           ~ 44 1
8 OT 19990308 ? 12 23 11.44 +06 44 05.1           ~ 1 0
9 GRB 990510 gB 13 38 07.64 -80 29 48.8           ~ 499 1
10 GRB 990123 gB 15 25 29 +44 45.0     8.95     ~ 1012 1
11 GRB 980703 gB 23 59 06.7 +08 35 07           ~ 453 1

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