GRB 080701A

E. Fenimore (LANL), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC),
J. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. Krimm (GSFC/USRA),
C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), D. Palmer (LANL),
T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU),
M. C. Stroh (PSU), J. Tueller (GSFC), T. Ukwatta (GWU)
(i.e. the Swift-BAT team):
 
Using the data set from T-120 to T+285 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 080701A (trigger #315615)
(Stroh, et al., GCN Circ. 7910
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 ).  The BAT ground-calculated position is
RA, Dec = 45.944, 75.481 deg which is 
   RA(J2000)  =  03h 03m 46.5s 
   Dec(J2000) = +75d 28' 50.7" 
with an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 55%.
 
The mask-weighted light curve shows a single FRED-like peak starting
at ~T-2 sec, peaking at ~T+0 sec, and ending at ~T+20 sec.
T90 (15-350 keV) is 18 +- 9 sec (estimated error including systematics).
 
The time-averaged spectrum from T-2.7 to T+24.6 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
2.24 +- 0.17.  The fluence in the 15-150 keV band is 7.1 +- 0.7 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T-0.08 sec in the 15-150 keV band
is 2.2 +- 0.2 ph/cm2/sec.  All the quoted errors are at the 90% confidence
level. 
 
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/315615/BA/

P.A. Milne (U Arizona) reports on behalf of the Super-LOTIS team:

The robotic 0.6m Super-LOTIS telescope began R-band observations of the error
region of GRB 080701A at 10:14:25 UT, 49 seconds after the trigger.
Initial 10 and 20 second exposures reveal no sources other than those
present in the relevant DSS image. A stack of 30x60sec images
reveals no source at the location of the XRT source (Stroh et al.,
GCN 7911
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 ), down to a 3-sigma limiting magnitude of R~19.5. Comparisons of
initial and final images reveals no brightening or fading sources.

We used the USNO-B star at RA=03:02:55.5, Dec=+75:28:42 to derive the
R2 magnitude upper-limit.

This message can be cited.

F.E. Marshall (NASA/GSFC) and M.C. Stroh (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT observed the field of GRB 080701A starting 2983 s after
the BAT trigger (Stroh et al., GCN Circ. 7910
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 ).  We do not find a source
in any of the UVOT observations inside the enhanced XRT error circle
(Evans et al., GCN Circ. 7914
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 ). The 3-sigma upper limits for detecting
a source in the first finding chart (FC) exposure and co-added frames are:

Filter            T_start(s)   T_stop(s)     Exp(s)     Mag (3-sigma UL)

white (FC)        2983         3082           98        >19.7
white             2983         9403          736        >21.0
v                 3914         4113          197        >19.1
b                 3298         4934          393        >20.2
u                 3093         4728          393        >19.9
uvw1              4324         4523          197        >20.0
uvm2              4119         4318          197        >19.6
uvw2              3709         3908          197        >20.2

The values quoted above are not corrected for the expected Galactic
extinction corresponding to a reddening of E(B-V) = 0.54 mag in
the direction of the burst (Schlegel et al. 1998).

Rossi, A. (TLS Tautenburg), Gonsalves, E. (U. Dartmouth), Schulze, S. (TLS  
Tautenburg), Klose, S. (TLS  Tautenburg), Filgas, R. (TLS  Tautenburg), 
and Ludwig, F. (TLS  Tautenburg) 
report on behalf of a larger collaboration:

We observed the X-ray error circle of the Swift GRB 080701A (Evans, P. A. 
et al., GCN 7914
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 ; Stroh, M. C. et al., GCN 7910
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 ) with the TLS 1.34m Schmidt 
telescope under good  observing conditions (seeing is about 1-2 arcsec and 
very good visibility). We obtained in total 10 x 150 sec images starting at 
21:02 UT and 5 x 300 sec images starting at 21:40 UT in the I band. We did 
not find any new source in the stacked image down to the 3-sigma limiting 
magnitude of 21.7 mag calibrated on USNO-B1 field.

This message can be cited.

C. Peters (Goshen College) and P. Garnavich (Notre Dame) report:

We observed the field of GRB 080701A with the Vatican Advanced Technology
Telescope (VATT) beginning July 1.46 (UT) or 45 minutes after
the bursts (Stroh et al. GCN 7910
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 ). Four exposures totaling 190 sec
in the R-band were obtained. The combined image was calibrated assuming
the
brightness of the USNO-B1 star at RA=3:03:21.50 DEC=75:28:15.48
is R=16.52.

No source is detected down to R=22.0 at the improved XRT
position (Evans et al. GCN 7914
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 ).

J. Wren, W.T. Vestrand, P.R. Wozniak, H. Davis, B. Norman
of Los Alamos National Laboratory report:

The RAPTOR telescope system responded to Swift trigger
315615 (Stroh et al., GCN 7910
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 ) under good observing conditions.
Our narrow-field instruments began observing the location at
10:14:06.47 UTC, 28.8 s after the Swift trigger.  We detect no
counterpart at the improved XRT position (Evans et al., GCN 7914
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 ).
The limiting magnitudes of our unfiltered observations when
calibrated to the USNO-B1 R-band are given in the following table.
The GRB location was also within the field of view of our
continuous all-sky monitoring system.  We can place 3 sigma limits
at or below magnitude 9.4 during the time period within 2
minutes both before and after the trigger.  

t-mid(s)    exp(s)     mag     mag-err
--------------------------------------------
-11.68      10.0       9.7     3 sigma limit
11.57       10.0      10.0     3 sigma limit
34.80       10.0       9.9     3 sigma limit
71.45       45.0      19.3     3 sigma limit
173.93     100.0      19.8     3 sigma limit
300.65     100.0      19.9     3 sigma limit
561.10     270.0      20.5     3 sigma limit