2008A&A...483..847K


Query : 2008A&A...483..847K

2008A&A...483..847K - Astronomy and Astrophysics, volume 483, 847-855 (2008/6-1)

Early emission of rising optical afterglows: the case of GRB 060904B and GRB 070420.

KLOTZ A., GENDRE B., STRATTA G., GALLI A., CORSI A., PREGER B., CUTINI S., PELANGEON A., ATTEIA J.L., BOEER M. and PIRO L.

Abstract (from CDS):

We present the time-resolved optical emission of gamma-ray bursts GRB 060904B and GRB 070420 during their prompt and early afterglow phases. We used time resolved photometry from optical data taken by the TAROT telescope and time resolved spectroscopy at high energies from the Swift spacecraft instrument. The optical emissions of both GRBs are found to increase from the end of the prompt phase, passing to a maximum of brightness at tpeak=9.2min and 3.3min for GRB 060904B and GRB 070420 respectively and then decrease. GRB 060904B presents a large optical plateau and a very large X-ray flare. We argue that the very large X-flare occurring near tpeak is produced by an extended internal engine activity and is only a coincidence with the optical emission. GRB 070420 observations would support this idea because there was no X-flare during the optical peak. The nature of the optical plateau of GRB 060904B is less clear and might be related to the late energy injection.

Abstract Copyright:

Journal keyword(s): gamma ray : bursts

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 GRB 041219 gB 00 24 27.7 +62 50 34           ~ 226 1
2 GRB 050904 gB 00 54 50.794 +14 05 09.42           ~ 471 0
3 GRB 060904B gB 03 52 50.520 -00 43 30.61 18.27 19.14 18.37     ~ 193 0
4 USNO-B1.0 0892-00038669 * 03 52 55.8712839336 -00 45 19.514585556   13.5   12.6   ~ 1 0
5 USNO-B1.0 0444-00107203 * 08 04 54.3666733176 -45 33 29.311162020   16.6   15.6   ~ 1 0
6 GRB 070420 gB 08 04 55.170 -45 33 19.99 20.39 20.01 17.16     ~ 80 0
7 USNO-B1.0 0444-00107218 * 08 04 55.2896743488 -45 33 13.016238588   18.9   17.6   ~ 1 0
8 USNO-B1.0 0444-00107222 * 08 04 55.5474728184 -45 33 18.867376656   19.3   17.6   ~ 1 0
9 USNO-B1.0 0444-00107368 * 08 05 05.0485189536 -45 33 12.275811000   14.5   13.2   ~ 1 0
10 GRB 050502B gB 09 30 10.024 +16 59 48.07           ~ 161 0
11 GRB 060206 gB 13 31 43.420 +35 03 03.60   19.99 17.09     ~ 314 0
12 GRB 050801 gB 13 36 35.000 -21 55 41.00 15.03 15.82 15.46     ~ 156 0
13 GRB 990123 gB 15 25 29 +44 45.0     8.95     ~ 990 1
14 GRB 060418 gB 15 45 42.600 -03 38 20.00 15.73 16.19 14.98     ~ 361 0
15 GRB 050401 gB 16 31 28.84 +02 11 14.5           ~ 336 0
16 GRB 060111B gB 19 05 42.480 +70 22 33.60     17.55     ~ 85 1
17 GRB 060607 gB 21 58 50.400 -22 29 46.70 18.49 16.67 15.09     ~ 296 0
18 GRB 070704 gB 23 38 47.31 +66 15 12.7           ~ 56 0

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