SUMMARY OF PROPOSAL 72192
CALTECH
MC 220-47
PASADENA
CA USA 91125
Tel: (626) 395-6601 Fax: (626) 449-8676
Medium: CD ROM
Subject: COSMIC X-RAY BACKGROUND AND DEEP SURVEYS AND OTHER
GRB980425: ASSOCIATED WITH THE UNUSUAL TYPE IB/IC SUPERNOVA 1998BW?
ABSTRACT
While the cosmological distance and extreme energy of the majority of gamma-ray bursts is established, a possible second class of GRBs has emerged in the spatial and temporal coincidence of GRB980425 with a peculiar and luminous supernova, SN 1998bw in a nearby galaxy. The one remaining cause of doubt about this identification was the simultaneous presence of a faint, variable SAX X-ray source in the GRB error circle, but not coincident with the SN. It is therefore important to reobserve this field with the higher sensitivity of ASCA to test for persistence. If recurring, it will be ruled out as the GRB afterglow, leaving SN1998bw as the only plausible identification. If not detected, it remains a possible GRB afterglow, and further investigations could strengthen it credentials.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| SHRINIVAS KULKARNI | CALTECH | USA |
| JULES HALPERN | COLUMBIA UNIVERSITY | USA |
| TOSHIO MURAKAMI | ISAS | JAPAN |
| STEPHEN THORSETT | PRINCETON | USA |
| DALE FRAIL | NRAO | USA |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)1SAXJ1935.3-5252 | A | 293.8375 | 52.8719 | 80 ks | Y | N | P | 0.01000 | 3 |
TARGET 1
MONITORED OBSERVATION:
Min. Interval: 600.000ksecMax. Interval: 10000.000 ksec