GRB 060607B
GCN Circular 5244
Subject
GRB 060607B: Swift detection of a burst
Date
2006-06-07T23:47:08Z (19 years ago)
From
Hans Krimm at NASA-GSFC <krimm@milkyway.gsfc.nasa.gov>
H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC),
N. Gehrels (NASA/GSFC), C. Gronwall (PSU), J. A. Kennea (PSU),
V. Mangano (INAF-IASFPA), K. M. McLean (LANL/UTD) and
M. Stamatikos (NASA/ORAU) report on behalf of the Swift Team:
At 23:32:44 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 060607B (trigger=213934). The BAT on-board calculated
location is RA,Dec 42.033, +14.736 {02h 48m 08s, +14d 44' 09"}
(J2000) with an uncertainty of 3 arcmin (radius, 90% containment,
including systematic uncertainty). The BAT light curve showed a
double-peaked structure with a duration of about 25 sec. The peak
count rate was ~1000 counts/sec (15-350 keV), at ~0 sec after the
trigger. Swift did not slew to this burst due to the Sun constraint.
Since this burst is only 33 degrees from the Sun, it will not be
observable by the Swift narrow field instruments until June 24.
GCN Circular 5246
Subject
GRB 060607B: Swift-BAT Refined Analysis
Date
2006-06-08T21:12:40Z (19 years ago)
From
Hans Krimm at NASA-GSFC <krimm@milkyway.gsfc.nasa.gov>
L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/ORAU),
E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho),
M. Koss (GSFC/UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD),
D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU),
G. Sato (GSFC/JSPS/USRA), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC),
on behalf of the Swift-BAT team:
Using the data set from T-239.4 to T+250 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 060607
(trigger #213934) (Krimm, et al., GCN 5244). The BAT
ground-calculated position
is (RA,Dec) = 42.048, 14.749 deg {2h 48m 11.6s, 14d 44' 57.1"} (J2000)
+- 1.2 arcmin, (radius, sys+stat, 90% containment). The partial
coding was 35%.
The mask-weighted light curve shows a double-peaked structure with peaks at
T+1 sec and T+9 sec. There is low-level emission out to T+30 sec.
T90 (15-350 keV) is 31 +- 5 sec (estimated error including systematics).
The time-averaged spectrum from T-0.8 to T+37.1 is best fit by
a simple power-law model. The power law index of the time-averaged
spectrum is 1.63 +- 0.12. The fluence in the 15-150 keV band is
1.7 +- 0.1 x 10^-06 erg/cm2. The 1-sec peak photon flux measured
from T+8.64 sec in the 15-150 keV band is 1.5 +- 0.3 ph/cm2/sec.
All the quoted errors are at the 90% confidence level.