GRB 140606A

M. C. Stroh (PSU), A. P. Beardmore (U Leicester),
J. R. Cummings (NASA/UMBC), P. A. Evans (U Leicester),
N. Gehrels (NASA/GSFC), J. A. Kennea (PSU),
F. E. Marshall (NASA/GSFC), P. Romano (INAF-IASFPA) and
R. L. C. Starling (U Leicester) report on behalf of the Swift Team:

At 10:58:13 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 140606A (trigger=600951).  Swift slewed immediately to the burst. 
The BAT on-board calculated location is 
RA, Dec 201.808, +37.579 which is 
   RA(J2000) = 13h 27m 14s
   Dec(J2000) = +37d 34' 44"
with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty).  The BAT light curve showed a double peak
structure with a duration of about 1 sec.  The peak count rate
was ~3000 counts/sec (15-350 keV), at ~0 sec after the trigger. 

XRT is currently not collecting science data. There will be no XRT data
on this burst until the anomaly is resolved. Details are given in GCN
Circ. 16349
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 . 

UVOT took a finding chart exposure of 150 seconds with the White filter
starting 67 seconds after the BAT trigger. No credible afterglow candidate has
been found in the initial data products. The 2.7'x2.7' sub-image covers 25% of
the BAT error circle. The typical 3-sigma upper limit has been about 19.6 mag. 
The 8'x8' region for the list of sources generated on-board covers 100% of the
BAT error circle. The list of sources is typically complete to about 18 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.01. 

Burst Advocate for this burst is M. C. Stroh (stroh AT astroh.org). 
Please contact the BA by email if you require additional information
regarding Swift followup of this burst. In extremely urgent cases, after
trying the Burst Advocate, you can contact the Swift PI by phone (see
Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC),
C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU),
M. Stamatikos (OSU), M. C. Stroh (PSU), J. Tueller (GSFC), T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
 
Using the data set from T-240 to T+962 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 140606A (trigger #600951)
(Stroh, et al., GCN Circ. 16353
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 ).  The BAT ground-calculated position is
RA, Dec = 201.799, 37.599 deg, which is 
   RA(J2000)  =  13h 27m 11.7s 
   Dec(J2000) = +37d 35' 56.5" 
with an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 86%.
 
The mask-weighted light curve shows a single spike starting at ~T+0.0,
peaking at ~T+0.1, and ending at ~T+0.3 sec.  T90 (15-350 keV) is
0.34 +- 0.09 sec (estimated error including systematics).
 
The time-averaged spectrum from T-0.04 to T+0.35 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
0.53 +- 0.36.  The fluence in the 15-150 keV band is 5.1 +- 1.0 x 10^-8 erg/cm2.
The 1-sec peak photon flux measured from T-0.34 sec in the 15-150 keV band
is 0.5 +- 0.1 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/600951/BA/

M. C. Stroh, J. A. Kennea (PSU), N. Gehrels (GSFC) and D. Malesani (DARK/NBI) report on behalf of the Swift-XRT team:

The Swift-XRT began observing the field of GRB 140606A 4.6 ks after the event (Stroh et al., GCN Circ. 16353
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 ). In 2.4ks of Photon Counting (PC) mode data, no source was found in the revised BAT error circle (Cummings et al., GCN Circ. 16354
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 ). The three sigma upper limit (0.5-10 keV) is 7.4e-3 counts s^-1.

The delayed XRT response was due to the XRT anomaly (Burrows and Kennea, GCN Circ. 16356
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 ).

This circular is an official product of the Swift team.

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

The Swift/UVOT began settled observations of the field of GRB 140606A
68 s after the BAT trigger (Stroh et al., GCN Circ. 16353
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 ).
No optical afterglow consistent with the BAT position
(Cummings et al. GCN Circ. 16354
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 )
is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            68          218          147         >21.1
u_FC               280          530          246         >20.4
white               68         6243          746         >21.6
v                  609         6654          471         >20.2
b                  535         6039          269         >20.8
u                  280         5834          442         >20.8
w1                 833         7064          452         >20.8
m2                1063         6859          413         >20.6
w2                1188         6449          413         >20.8

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).

D. Xu (DARK/NBI), H.-B. Niu, T.-Z. Yang, A. Esamdin, L. Ma (XAO) report:

We observed the BAT field of GRB 140606A (Stroh et al., GCN 16353
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 )
using the 1m telescope located at Nanshan, Xinjiang, China.
Observations started at 15:49:48 UT on 2014/06/06 (4.86 hr after the
burst) and a series of 300s/500s R-band frames were obtained.

The optical afterglow of the burst is not detected within the BAT
error circle down to a limiting magnitude of R=20.8 mag, calibrated
with the nearby SDSS field.

M. Jelinek, R. Cunniffe, A. Gonz��lez-Rodr��guez, S. Jeong, O. Lara-Gil, S.
R. Oates, J. C. Tello (IAA-CSIC Granada), J. Gorosabel (IAA-CSIC, UPV-EHU)
and A. J. Castro-Tirado (IAA-CSIC, ISA-UMA), report:

"Following the detection of GRB 140606A by Swift (Stroh et al., GCNC
16353), the 0.6m TELMA robotic telescope at the BOOTES-2 astronomical
station Malaga (Spain), observed the GRB location under non optimal
weather conditions. A coadd of 105 images (60s each, i���-band filter) taken
starting at 20:46 UT and ending at 01:33 UT (i.e. 10 hr post burst)
reveals no optical afterglow down to 18.8 mag."

A. Volnova (IKI), R. Inasaridze (AAO), O. Kvaratskhelia (AAO), V.
Ayvazian (AAO), Yu. Krugly (IA KhNU), I. Molotov (KIAM), A. Pozanenko
(IKI) report on behalf of larger GRB follow-up collaboration:

We observed a field of the Swift GRB 140606A (Stroh et al., GCN 16353
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 ) 
with AS-32 (0.7m) telescope of Abastumani Observatory starting on June,
06 (UT) 18:16:50. We obtained several unfiltered frames with exposure of 
each frame of 120 s. Within the BAT ground-calculated position (Cummings 
et al., GCN 16354
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 ) we do not detect evident variable source.

The details of the photometry are the following:

date       UT start   t-T0       Filter  Exp.    Uplim
                      (mid, days)         (s)     (3 sigma)

2014-06-06 18:16:50   0.33147    None   30*120   21.7

and based on SDSS star, R (gri -> R transformations by Lupton 2005):
J132717.88+373507.2
R_Lupton = 16.45 �� 0.013

A. S. Moskvitin (SAO RAS), A. F. Valeev (SAO RAS, Kazan Federal U.),
V. N. Komarova (SAO RAS), V. V. Sokolov, T.N. Sokolova (SAO RAS),
J. Aceituno, S. R. Oates (IAA-CSIC), J. Gorosabel (IAA-CSIC, EPV-EHU) and
A. J. Castro-Tirado (IAA-CSIC, ISA-UMA) on behalf of larger collaboration
report:

We observed the field of the short GRB 140606A (Stroh et al., GCNC 16353)
11.3 h after with the 6-meter BTA (+Scorpio-I) at SAO-RAS (Zelenchuk,
Russia). Comparison images (R-band) were obtained with the 1.5m telescope
at Observatorio de Sierra Nevada (south Spain) 60 h post burst. Within the
refined BAT gamma-ray burst error circle (Cummings et al., GCNC 16354), we
identify no variable object down to R = 22, in agreement with the limit
reported by Volnova et al. (GCNC 16371).