Наблюдаем гамма-всплески

[Сергей Шмальц]

TITLE:   GCN CIRCULAR
NUMBER:  17649
SUBJECT: GRB 150323B: Khureltogot optical observations
DATE:    15/03/27 19:01:34 GMT
FROM:    Alexei Pozanenko at IKI, Moscow

E. Mazaeva (IKI), S. Schmalz (AIP), N. Tungalag (Research Center of
Astronomy and Geophysics MAS),  A. Volnova (IKI), I.Molotov (KIAM), A.
Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:

We observed the field of GRB 150323B  (Cummings  et al., GCN 17619) with
ORI-40 telescope of Khureltogot observatory  starting on   Mar., 23 (UT)
16:06:11. We obtained 60 unfiltered images of 60 s exposure. Following
detection of XRT sources (D'Avanzo et al., GCN 17634) we do not detect
any source within XRT error circle of the source #1 up to a limiting
magnitude 21.2. In particular we do detect the optical source found by
Kelemen et al. (GCN 17643).  At the position of XRT source #2 we found
optical source which coincides with USNO star mentioned by Xin et al.
(GCN 17638) and the star of SDSS DR9 catalog J172150.45+381700.1.

Photometry of the sources is following

Source#  Date       UT start  t-T0    Filter  Exp.   mag.    UL(3sigma)
                              (mid, days)      (s)

1       2015-03-23  16:06:11  0.29859  none   60*60  n/d          21.2
2       2015-03-23  16:06:11  0.29859  none   60*60  20.7+/-0.25  21.2

The photometry is based on R magnitudes of nearby SDSS DR9 stars

SDSS9_id               R(Lupton)
J172146.77+381659.6    15.65
J172126.47+382201.1    18.14
J172127.98+382239.0    15.39

[krypton]

TITLE:   GCN CIRCULAR
NUMBER:  17671
SUBJECT: GRB 150323C: CrAO optical observations
DATE:    15/04/04 11:23:31 GMT
FROM:    Alexei Pozanenko at IKI, Moscow
V. Rumyantsev (CrAO), K. Antoniuk  (CrAO), E. Mazaeva (IKI),  A. Pozanenko
(IKI) report on  behalf of larger GRB follow-up collaboration:
We observed the field of the GRB 150323C (Amaral-Rogers  et al., GCN 17621)
with AZT-11 telescope of CrAO observatory starting on Mar. 23 (UT) 20:09:58.
We obtained ages in R-filter of 180 s exposure under non-optimal weather
conditions and mean FWHM of about 4.7 arcsec. In the enhanced XRT  position
(Osborne et al., GCN 17633)  we do not detect  any object. In particular we
do no detect optical afterglow (Xu et al. GCN 17625, Xin et al. GCN 17631;
Watson et al. GCN 17632). An upper limit is following
Date              UT start,    t-t0          Filter   Exp.     OT   UL (3
sigma)
                                        (mid, days)         (s)
2015-03-23 20:09:58   0.14949  R        20*180  n/d  21.0
The photometry is based on nearby USNO-B1.0  stars.

[krypton]

TITLE:   GCN CIRCULAR
NUMBER:  17669
SUBJECT: GRB 150323C: Khureltogot optical observations
DATE:    15/04/04 11:07:51 GMT
FROM:    Alexei Pozanenko at IKI, Moscow
E. Mazaeva (IKI), S. Schmalz (AIP), N. Tungalag (Research Center of
Astronomy and Geophysics MAS),  A. Volnova (IKI), I.Molotov (KIAM), A.
Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the GRB 150323C (Amaral-Rogers  et al., GCN 17621)
with ORI-40 telescope of Khureltogot observatory starting on Mar., 23 (UT)
17:20:51, i.e. ~15 minutes after burst trigger. We obtained 180 unfiltered
images of 60 s exposure. Within  enhanced Swift-XRT error circle (Osborne et
al., GCN 17633)  we detect optical afterglow (Xu et al. GCN 17625, Xin et
al. GCN 17631; Watson et al. GCN 17632). Preliminary photometry of the
afterglow in combined images is following
Date        UT start  t-T0                  Filter      Exp.   OT  OT_err
                       (mid, days)                              (s)
2015-01-23  17:20:51  0.01449   none    10*60  21.1 0.3
2015-01-23  17:31:40  0.02199   none    10*60  20.5 0.25
2015-01-23  17:42:28  0.02950   none    10*60  20.8 0.25
2015-01-23  17:53:17  0.03700   none    10*60  20.2 0.2
2015-01-23  18:04:04  0.04451   none    10*60  20.0 0.2
2015-01-23  18:14:54  0.06199   none    35*60  21.3 0.3
2015-01-23  18:54:26  0.09409   none    39*60  21.0 0.3
2015-01-23  19:57:04  0.13649   none    40*60  21.5 0.4
Photometry is based on SDSS DR9 stars:
SDSS9_id                        R(Lupton)
J125026.13+501147.9  16.16
J125023.08+501048.2  16.84
Our photometry confirms  non-monotonic behaiviour of a lighr curve of the
afterglow mentioned by Xin et al. (GCN 17631).
The light curve of GRB 150323C afterglow can be found in
http://grb.rssi.ru/GRB150323C/GRB150323C_ORI40_lc.png

[krypton]

TITLE:   GCN CIRCULAR
NUMBER:  17692
SUBJECT: GRB 150413A: Khureltogot optical observations
DATE:    15/04/13 15:55:04 GMT
FROM:    Alexei Pozanenko at IKI, Moscow,
S. Schmalz (AIP), A. Pozanenko (IKI),  N. Tungalag (Research Center of
Astronomy and Geophysics MAS),   E. Mazaeva (IKI), A. Volnova (IKI),
I.Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB
follow-up collaboration:
We observed the field of the GRB 150413A (Markwardt  et al., GCN 17688;
Serino et al., GCN 17691) with ORI-40 telescope of Khureltogot
observatory starting on Apr., 13 (UT) 14:08:52, i.e. ~10 minutes after
burst trigger.   Within   BAT/Swift  error circle  we clearly detect
fading optical source  (Ivanov et al. GCN 17689, Tyurina et al. GCN
17690). Preliminary photometry of the source in single images is following
Date        UT start   t-T0  Filter    Exp.   OT  OT_err
                       (mid, days)      (s)
2015-04-13  14:08:52   0.0069 none     60  14.7 0.1
2015-04-13  14:39:52   0.0318 none     60  15.6 0.1
2015-04-13  15:11:54   0.0541 none     60  16.3 0.1
Photometry is based on nearby USNO-B1.0 stars, R2 mags.
Observation is continuing.

[Сергей Шмальц]

Получена кривая блеска покрывающая примерно пять с половиной часов наблюдения GRB150413A в Монголии.

[krypton]

TITLE:   GCN CIRCULAR
NUMBER:  17718
SUBJECT: GRB 150413A: ISON-Ussuriysk optical observations
DATE:    15/04/17 21:33:14 GMT
FROM:    Alexei Pozanenko at IKI, Moscow
E. Mazaeva (IKI),  A. Stepura (UAFO, ISON),  A. Matkin (UAFO, ISON), A.
Volnova (IKI), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of
larger GRB follow-up collaboration:
We observed the field of the GRB 150413A (Markwardt  et al., GCN 17688)
with SANTEL-650 (0.65m)  telescope of UAFO/ISON-Ussuriysk observatory
sstarting on Apr., 14 (UT) 11:48:05.   The afterglow   (Ivanov et al., GCN
17689) is clearly detected in a combined image. Preliminary photometry the
unfiltered combined image  is following
Date            UT start   t-T0        Filter     Exp.     OT      OT_err
                                 (mid, days)          (s)
2015-04-14  11:48:05  0.95859   none     117*60  20.35   0.15
The photometry is based on nearby USNO-B1.0  stars

[krypton]

TITLE:   GCN CIRCULAR
NUMBER:  17750
SUBJECT: GRB 150423A: TSHAO optical observations
DATE:    15/04/24 14:37:06 GMT
FROM:    Alexei Pozanenko at IKI, Moscow
E. Mazaeva (IKI), A. Volnova (IKI), A. Kusakin (Fesenkov Astrophysical
Institute),  A. Pozanenko  (IKI) report on behalf of larger GRB follow-up
collaboration:
We observed the field of GRB 150423A (Pagani et al., GCNC 17728) with
Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical Observatory
starting on Apr. 23 (UT) 17:43:02.  We obtained several  images in R-filter.
In a combined image we marginally detect the source S2 and do not detect the
afterglow (Varela et al., GCN 17729). Coordinates of the S2  (J2000) 14 46
18.94  +12 17 04.4  with an uncertainty of  0.4" is marginally coincide with
coordinates reported by Varela et al.  (GCN 17729).
A preliminary photometry is following
date              UT start    t-T0         Filter  Exp.        S1       S2
S2_err
                                      (mid, days)        (s)
2015-04-23 17:43:02  0.57561  R       25*600  >22.7   22.7   0.3

and based on nearby SDSS DR9 stars:
 SDSS9_id R(Lupton)
 J144606.22+121513.3 15.42
 J144647.40+121502.9 17.54
 J144648.52+121523.3 15.15

[krypton]

TITLE:   GCN CIRCULAR
NUMBER:  17784
SUBJECT: GRB 150413A: CrAO optical observations
DATE:    15/04/28 19:47:55 GMT
FROM:    Alexei Pozanenko at IKI, Moscow
V. Rumyantsev (CrAO), K. Antoniuk  (CrAO), E. Mazaeva (IKI),  A.
Pozanenko (IKI) report on  behalf of larger GRB follow-up collaboration:
We observed the field of the GRB 150413A (Markwardt  et al., GCN 17688)
  with AZT-11 telescope of CrAO observatory starting on Apr. 13 (UT)
17:39:02. Several images were take in R-filter. The afterglow   (Ivanov
et al., GCN 17689) is clearly detected in all single images of 180 s
exposure. Preliminary photometry is following
Date,       UT start,    OT,    OT_err
2015-04-13  17 40 32.11  16.56  0.12
2015-04-13  17 43 36.17  16.97  0.30
2015-04-13  17 46 40.21  16.48  0.07
2015-04-13  17 49 44.26  16.73  0.11
2015-04-13  17 52 48.30  16.48  0.15
2015-04-13  17 55 52.37  16.62  0.13
2015-04-13  17 58 56.41  16.74  0.09
2015-04-13  18 02 00.58  16.63  0.13
2015-04-13  18 05 04.68  16.78  0.10
2015-04-13  18 08 08.76  16.77  0.09
2015-04-13  18 11 12.83  16.63  0.07
2015-04-13  18 14 16.87  16.74  0.06
2015-04-13  18 17 20.95  16.74  0.04
2015-04-13  18 20 25.30  16.76  0.06
2015-04-13  18 23 29.10  16.77  0.10
2015-04-13  18 26 33.15  16.90  0.08
2015-04-13  18 29 37.20  16.74  0.07
2015-04-13  18 32 41.25  16.71  0.05
2015-04-13  18 35 45.30  16.78  0.04
2015-04-13  18 38 49.36  16.77  0.03
2015-04-13  18 44 31.44  16.88  0.03
2015-04-13  18 47 35.48  16.81  0.03
2015-04-13  18 50 39.57  16.87  0.03
2015-04-13  18 53 43.66  16.92  0.03
2015-04-13  18 56 47.73  16.98  0.03
2015-04-13  18 59 51.90  17.02  0.03
2015-04-13  19 02 55.98  16.95  0.04
2015-04-13  19 06 00.64  16.94  0.04
2015-04-13  19 09 04.22  17.08  0.07
2015-04-13  19 12 08.35  17.05  0.06
The photometry is based on nearby USNO-B1.0  1618-0098185 (Xu et al.,
GCN 17693) assuming R=15.59.

[krypton]

TITLE:   GCN CIRCULAR
NUMBER:  17815
SUBJECT: GRB 150512A: CrAO optical observations
DATE:    15/05/14 19:30:18 GMT
FROM:    Alexei Pozanenko at IKI, Moscow
E. Mazaeva (IKI), V. Rumyantsev (CrAO),  A. Pozanenko (IKI) report on
behalf of larger GRB follow-up collaboration:
We observed the two OT candidates (Singer et al., GCN 17809)  of the
Fermi GRB  150512A (Zhang et al., GCN 17811) with ZTSh telescope of CrAO
observatory starting on May. 13 (UT) 21:04:53. Both candidats are
clearly visible in our images. Photometry of the candidates is following
iPTF15asn:
Date       UT start   t-T0     Filter   Exp.    Source    Err.
                       (mid, days)       (s)
2015-05-13 21:04:53   1.45795  R        16*120  19.20     0.03

iPTF15asm:
Date       UT start   t-T0     Filter   Exp.    Source    Err.
                       (mid, days)       (s)
2015-05-13 21:46:49   1.48417  R        12*120  19.40     0.02
Photometry of iPTF15asm might be biased by nearby galaxy SDSS
J134044.09+631954.4. However both sources do not fade in comparison with
early observations (Singer et al., GCN 17809) and most probably cannot
be considered as afterglow.
Photometry is in Vega, and based on following SDSS stars
SDSS9_id               R_Lupton
J135741.63+650759.8    16.82
J135738.44+650852.4    18.03
J135752.58+650922.2    18.14

[krypton]

TITLE:   GCN CIRCULAR
NUMBER:  17903
SUBJECT: GRB 150518A: possible SN observations
DATE:    15/06/06 15:19:15 GMT
FROM:    Alexei Pozanenko at IKI, Moscow
A. Pozanenko (IKI), E. Mazaeva (IKI),  A. Sergeev (IRA NASU, IAKhNU), I.
Reva (Fesenkov Astrophysical Institute), A. Volnova (IKI),  E. Klunko
(ISTP), I. Korobtsev (ISTP), report on behalf of larger GRB follow-up
collaboration:
We observed the field of the MAXI/GSC GRB 150518A (Kawamuro, et al., GCN
17825) with AZT-33IK telescope of Sayan observatory (Mondy), Zeiss-1000
(East) 1-m telescope of Tien Shan Astronomical
Observatory and AZT-22 telescope of Maidanak observatory.
Observations are continuing in R-filter. The SDSS J153648.25+161946.9
galaxy which coincides with the optical afterglow (Xu et al., GCN 17829)
is  detected in all observations. The light curve of the host
galaxy+afterglow are suggesting re-brightening with a possible maximum
brightness on June 2-5.  We suggest that this re-brightening can be
attributed to Supernova associated with GRB 150518A.  Preliminary light
curve of the possible SN+host can be found in
http://grb.rssi.ru/GRB150518A/GRB150518A_lc.png
Photometry of the host galaxy+SN at the possible maximum brightness  are
following
Date       UT start   t-T0     Filter     OT    Err.  Observatory
                       (mid, days)
2015-06-02 17:43:30   14.8605  R          20.89 0.13  TSHAO
2015-06-03 20:33:20   15.8862  R          20.82 0.10  Maidanak
2015-06-05 18:11:19   17.8535  R          20.90 0.07  Maidanak
Photometry is based on SDSS DR9 stars:
SDSS9_id            R(Lupton)
J153646.11+161904.1    17.65
J153638.21+162002.8    18.41
J153637.55+162040.3    17.10
J153645.59+162055.5    16.35
The maximum brightness of a the possible Supernova is an agreement with
the brightness predicted for the SN at redshift z = 0.256 (Xu et al.,
GCN 17832).

[krypton]

TITLE:   GCN CIRCULAR
NUMBER:  17915
SUBJECT: GRB150607A: AAO and CrAO optical observations
DATE:    15/06/08 17:49:29 GMT
FROM:    Alexei Pozanenko at IKI, Moscow
E. Mazaeva (IKI), R. Inasaridze (AAO), S. Nazarov (CrAO), Sh.
Makandarashvili (AAO), A. Volnova (IKI), I. Molotov (KIAM), A. Pozanenko
(IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 150607A (Swift trigger 642620, D'Elia et
al., GCN 17904) with the AS-32 (0.7m) telescope of Abastumani
Observatory (AAO) starting on June, 07 17:54:22, and with AZT-8
telescope of CrAO starting on June, 07 19:43:21.  The afterglow of GRB
150607A (Kruehler et al., GCN 17908; Hagen et al., GCN 17909) is clearly
detected in early observation in AAO. Preliminary photometry is following.
telescope  UT start   t-T0     Filter   Exp.     OT    Err.
                       (mid, days)       (s)
AS-32      17:54:22   0.45669  None     44*120   21.20 0.1
AZT-8      19:43:21   0.49864  R         6*180  >19.4 (3sigma)
Photometry is based on nearby USNO-B1.0 stars.

[Сергей Шмальц]

TITLE:   GCN CIRCULAR
NUMBER:  17940
SUBJECT: V404 Cyg outburst (Swift trigger 643949 ): TSHAO optical observations
DATE:    15/06/17 14:52:17 GMT
FROM:    Alexei Pozanenko at IKI, Moscow

E. Mazaeva (IKI), I. Reva (Fesenkov Astrophysical Institute), A. Volnova
(IKI),  A. Pozanenko  (IKI) report on behalf of larger GRB follow-up
collaboration:

We observed the  V404 Cyg outburst  detected by BAT/Swift (Barthelmy et
al., GCN 17929), GBM/Fermi (Younes, GCN 17932; Jenke GCN 17935),  and
Konus-Wind (Golenetskiiet al., GCN 17938) with Zeiss-1000 (East) 1-m
telescope of Tien Shan Astronomical Observatory. Observations started on
June, 15 (UT) 18:50:44 and continued on June 16.  We obtained several
images in R-filter. The V404 Cyg optical outburst reported early (Gazeas
  et al, GCN 17931; Oates GCN 17933) is clearly visible.  The V404 Cyg
is overexposed in our initial images but can be recovered with more
detailed analysis.

Preliminary light curve of the V404 Cyg can be found in

http://grb.rssi.ru/V404_Cyg/v404_20150615_lc.png

Photometry is based on following USNO-B1.0 stars

ID              R2
1238-0434779    13.52
1238-0434864    14.12

[krypton]

TITLE:   GCN CIRCULAR
NUMBER:  18035
SUBJECT: GRB 150711A: Burakan-ISON optical observations
DATE:    15/07/18 22:00:01 GMT
FROM:    Alexei Pozanenko at IKI, Moscow

E. Mazaeva (IKI), V. Nevskiy (ISON) I. Molotov (KIAM), A. Pozanenko
(IKI) report on behalf of larger GRB follow-up collaboration:

We observed the field of GRB 150711A (Bernardini et al. GCN 18011) with
the 40 cm telescope of Burakan-ISON observatory starting on Jul., 11
(UT) 18:36:16, i.e. ~13 min after burst trigger. We obtained several
unfiltered images. In a combined image we  do not detect any source
within the XRT error box (Osborne et al. GCN 18012) down to a limiting
magnitude of R = 16.9

Date       UT start  t-T0      Filter   Exp.  OT    UL(3 sigma)
                     (mid, days)         (s)

2015-07-11 18:36:16  0.01250   none     9*60  n/d   16.9

The photometry is based on nearby USNO-B1.0  stars.

[krypton]

TITLE:   GCN CIRCULAR
NUMBER:  18094
SUBJECT: GRB 150728A: AAO optical observations
DATE:    15/07/29 18:30:31 GMT
FROM:    Alexei Pozanenko at IKI, Moscow

E. Mazaeva (IKI), R. Inasaridze (AAO), Sh. Makandarashvili (AAO),   A.
Volnova (IKI), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:

We observed the field of the Swift GRB 150728A (Krimm et al. GCN 18087)
  with AS-32 (0.7m) telescope of Abastumani Observatory starting on Jul.
28 (UT) 19:32:14.  Within the enhanced XRT error circle (Beardmore et al. GCN 18088) we detected the object coinciding with the object found by FTN (Dichiara et al. GCN 18090).  A photometry of the object is following

Date       UT start    t-T0     Filter  Exp.     OT
                        (mid, days)      (s)

2015-07-28 19:32:14    0.30491  None    28*120   20.6+/-0.25

The photometry is based on nearby USNO-B1.0 stars USNO-B.1_id  R2
1239-0338943 17.06
1239-0338998 16.69

The photometry could be biased by nearby star. Presently we cannot say nothing about variability of the object and more observation is necessary to confirm/reject the object as afterglow of GRB 150728A.

[krypton]

TITLE:   GCN CIRCULAR
NUMBER:  18097
SUBJECT: GRB 150728A: TSHAO optical observations
DATE:    15/07/30 18:41:10 GMT
FROM:    Alexei Pozanenko at IKI, Moscow

E. Mazaeva (IKI), I. Reva (Fesenkov Astrophysical Institute),   A.
Volnova (IKI), A. Pozanenko  (IKI) report on behalf of larger GRB
follow-up collaboration:

We observed the field of the Swift GRB 150728A (Krimm et al. GCN 18087)
   with Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical
Observatory starting on Jul. 29 (UT) 18:34:50.  We obtained several
images in R-filter.  In a combined image we do not detect the FTN object
(Dichiara et al. GCN 18090) also visible in AAO observations (Mazaeva et
al., GCN 18094) and source A in RATIR observations (Watson  et al., GCN
18096).
A photometry of the field is following

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

2015-07-29 18:34:50    1.26425  R       15*300   21.2

The photometry is based on nearby USNO-B1.0 stars
USNO-B.1_id  R2
1239-0338943 17.06
1239-0338998 16.69

Also we marginally detect object B of the  RATIR observations (Watson
et al., GCN 18096) in our current and previous observation of the field
(Mazaeva et al., GCN 18094).

The finding chart can be found in
http://grb.rssi.ru/GRB150728A/GRB150728A_AAO_left_TSHAO_right.png

Would the source A be a  non-variable point like object with magnitudes
of  r=21.37+/-0.04 and   i=20.89+/-0.04 (Watson  et al., GCN 18096) in
our observation the object A might be detected  as the object with a
magnitude less than R=21.3 (3 sigma). So we tentatively suggest the
object A as an afterglow candidate.