GRB 060102

A. Retter (PSU), S. Barthelmy (GSFC), D. Burrows (PSU), M. Chester (PSU),
N. Gehrels (GSFC), S. Immler (GSFC), F. Marshall (GSFC), T. Sakamoto (GSFC)
on behalf of the Swift team:

At 21:17:28 UT, Swift-BAT triggered and located GRB 060102 (trigger=175603).
The spacecraft did not slew to this burst because of the Moon observing
constraint.  The BAT on-board calculated location is RA,Dec 328.852d,-1.846d
{21h 55m 25s,-01d 50' 44"} (J2000), with an uncertainty of 3 arcmin
(radius, 90% containment, stat+sys).  The BAT light curve shows a multi-peak
structure with a total duration of ~20 sec.  The peak count rate was
~1500 counts/sec (15-350 keV), at ~1 seconds after the trigger.

[GCN OPS NOTE(03jan06): The time is wrong (as noted in Circ 4424).  The 02:45:43
value was changed to 21:17:28 UT.  All the other values are correct.]
[GCN OPS NOTE(03feb06): per author's request, "E.Retter" was changed to "A.Retter".]

S. Barthelmy (GSFC), D. Burrows (PSU), M. Chester (PSU),
N. Gehrels (GSFC), S. Immler (GSFC), A. Retter (PSU), T. Sakamoto (GSFC)
on behalf of the Swift team:

We correct the trigger time for GRB 060102 (trigger=175603)
in GCN Circular #4423
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 .  A data corruption problem caused 
the conversion from spacecraft time to Universal Time to be off 
by 16 million seconds.  The correct trigger time for GRB 060102 
is 21:17:28 UT (+/- ~2 sec for the unknown correction factor).

[GCN OPS NOTE(03feb06): per author's request, "E.Retter" was changed to "A.Retter".]

H. Krimm (GSFC/USRA), L. Barbier (GSFC), S. Barthelmy (GSFC), 
M. Chester (PSU), J. Cummings (GSFC/NRC), E. Fenimore (LANL), 
N. Gehrels (GSFC), D. Hullinger (UMD), C. Markwardt (GSFC/UMD), 
F. Marshall (GSFC), D. Palmer (LANL), A. Parsons (GSFC), 
T. Sakamoto (GSFC/NRC), G. Sato (ISAS), J. Tueller (GSFC), 
on behalf of the Swift-BAT team:

Using the data set from T-119.9 to T+248.2 sec from the recent 
telemetry downlink, we report further analysis of BAT GRB 060102 
(trigger #175603)  (Retter, et al., GCN 4423
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 ).  
The BAT ground-calculated  position is 
(RA,Dec) = 328.834, -1.838 {21h 55m 20.3s, -1d 50' 17.8"} [deg; J2000] 
+- 2.8 arcmin, (radius, sys+stat, 90% containment).  
The partial coding was 89 %.  

The BAT light curve shows a single peak of about three seconds followed 
by the small bump at T+16 sec.  T90 (15-350 keV) is (21 +- 2) sec 
(estimated error including systematics).  
 
The power law index of the time-averaged spectrum is 1.19 +- 0.38. 
The fluence in the 15-150 keV band is (2.4 +- 0.5) x 10^-07 erg/cm2. 
The 1-sec peak photon flux measured from T+0.72 sec in the 15-150 keV 
band is (0.4 +- 0.1) ph/cm2/sec.  All the quoted errors are at the 90% 
confidence level.  

A data glitch caused the original GCN Notices to go out with 
the wrong burst trigger time (02:45:43 instead of 21:17:28 UT). 
This was not realized during the first circular (#4423), 
but was corrected in circular 4424.

E. Armstrong (UCSD), J. P. Halpern, S. Tyagi, &  N. Zimmerman (Columbia U.)
report on behalf of the MDM Observatory GRB follow-up team:

"We observed the position of GRB 060102 in the R band using the MDM 1.3m.
The sum of three 5-minute exposures beginning on Jan. 3 02:28 UT, or
5.2 hours after the burst, shows no new object within the revised BAT
error circle (Krimm et al., GCN 4425
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 ) to a 5-sigma limit of R > 20.5
(statistical + systematic) in comparison with the Digitized Sky Survey."

A. Retter, J. Kennea, D. Burrows, D. Grupe, J. Nousek (PSU);
N. Gehrels (GSFC)

GRB 060102 (trigger #175603; Retter et al. GCN 4423
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 ) was observed with
the XRT for 2 ksec about 47 hours after the BAT trigger. No afterglow
candidate was found. The 3-sigma upper limit is 0.003 counts/s (1.5e-13
ergs/s/cm^2). Earlier observations were prohibited by sun and moon
constraints. No further observations are planned.