Gamma-ray Burst 140320C

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Thu 20 Mar 14 13:17:46 UT 
NOTICE_TYPE:    INTEGRAL Wakeup
TRIGGER_NUM:    6554,   Sub_Num: 0
GRB_RA:         134.3813d {+08h 57m 32s} (J2000),
                134.7288d {+08h 58m 55s} (current),
                133.1468d {+08h 52m 35s} (1950)
GRB_DEC:        +71.2024d {+71d 12' 09"} (J2000),
                +71.1469d {+71d 08' 49"} (current),
                +71.3950d {+71d 23' 42"} (1950)
GRB_ERROR:      3.17 [arcmin, radius, statistical only]
GRB_INTEN:      8.83 [sigma]
GRB_TIME:       47860.33 SOD {13:17:40.33} UT
GRB_DATE:       16736 TJD;    79 DOY;   14/03/20  
SC_RA:          149.05 [deg] (J2000)
SC_DEC:          75.17 [deg] (J2000)  
SUN_POSTN:      359.87d {+23h 59m 28s}   -0.06d{-00d 03' 30"}
SUN_DIST:       103.23 [deg]   Sun_angle= -9.0 [hr] (East of Sun)
MOON_POSTN:     223.25d{+14h 52m 59s}-14.98d{-14d 58' 50"}
MOON_DIST:      103.68 [deg]
GAL_COORDS:     142.67, 35.56 [deg] galactic lon,lat ofthe burst
ECL_COORDS:     110.98, 50.98 [deg] ecliptic lon,lat ofthe burst
COMMENTS:       INTEGRAL GRB Coordinates.
COMMENTS:       Time_Scale=20.0000 and Time_Error=20.0000.
COMMENTS:       Possibly real GRB event

GCN NOTICE

 
TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Thu 20 Mar 14 14:42:34 UT 
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    6554,   Sub_Num: 1
GRB_RA:         134.4174d {+08h 57m 40s} (J2000),
                134.7648d {+08h 59m 04s} (current),
                133.1834d {+08h 52m 44s} (1950)
GRB_DEC:        +71.2001d {+71d 12' 00"} (J2000),
                +71.1445d {+71d 08' 40"} (current),
                +71.3928d {+71d 23' 34"} (1950)
GRB_ERROR:      3.00 [arcmin, radius, statistical only]
GRB_INTEN:      8.83 [sigma]   
GRB_TIME:       47860.33 SOD {13:17:40.33} UT
GRB_DATE:       16736 TJD;    79 DOY;   14/03/20  
SC_RA:          149.05 [deg] (J2000)
SC_DEC:          75.17 [deg] (J2000)  
SUN_POSTN:      359.92d {+23h 59m 40s}   -0.04d{-00d 02' 06"}
SUN_DIST:       103.21 [deg]   Sun_angle= -9.0 [hr] (East of Sun)
MOON_POSTN:     224.04d{+14h 56m 09s}-15.14d{-15d 08' 15"}
MOON_DIST:      104.07 [deg]
GAL_COORDS:     142.66, 35.57 [deg] galactic lon,lat ofthe burst
ECL_COORDS:     110.99, 50.98 [deg] ecliptic lon,lat ofthe burst
COMMENTS:       INTEGRAL GRB Coordinates.
COMMENTS:       Time_Scale=20.0000 and Time_Error=20.0000.
COMMENTS:       refined_coordinates_after_offline_analysis

GCN Circular #16007
S.Mereghetti (IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo, E.Filippova (ISDC, Versoix), and J.Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
a gamma ray burst lasting about 30 s has been detected by IBAS in the IBIS/ISGRI data at 13:17:20 UT of March 20, 2014.
The refined coordinates (J2000) are:
```
R.A.=  134.4175 deg
DEC.=  +71.2002  deg
```
with an uncertainty of 3 arcmin (90% c.l.).
A preliminary analysis gives a peak flux of about 0.15 counts/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 2e-7 erg/cmq.
A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html
GCN Circular #16008
A. Melandri (INAF-OAB), C. Guidorzi (U. Ferrara), A. Gomboc (U. Ljubljana) and C. G. Mundell (LJMU) on behalf of a larger collaboration report:
The 2-m Faulkes Telescope North automatically began observing INTEGRAL GRB 140320C (Mereghetti et al. GCN 16007) on March 20 at 13:21:39.3 UT (~4.3 min after the burst trigger).
We do not find any fading candidate in our first 10s image within the entire INTEGRAL error circle down to a limiting magnitude or R>19.5 (5 sigma upper limit).
GCN Circular #16009
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk
E. Gorbovskoy, V. Lipunov, M. Pruzhinskaya, D.Denisenko, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D.Kuvshinov Lomonosov Moscow State University, Sternberg Astronomical Institute
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA)
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB140320C (Mereghetti et. al GCN 16007) 25 sec after notice time and 33 sec after trigger time at 2014-03-20 13:18:13 UT in two polarizations. We haven`t found optical transient within INTEGRAL error-box on single and coadd images. The 5-sigma upper limit has been about 16.8 mag on first single 10 sec image. On coadd of 11 first images with different exposures and total exosure time 610 sec the 5-sigma upper limit has been about 20.0 mag in bosh polarization.
The message may be cited.
GCN Circular #16012
A.Volnova (IKI), E. Klunko (ISTP), I. Korobtsev (ISTP), M. Eselevich (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 140320C (Mereghetti et al., GCN 16007) with AZT-33IK telescope of Mondy observatory starting on Mar. 20 (UT) 15:12:44. We obtained several images of 120 s exposure in R-filter. Within entire INTEGRAL error circle we identified sources which are not presented in the DSS2(R) image:
```
N  RA(J2000)    Dec. (J2000)

1. 08 57 55.04 +71 13 36.5
2. 08 57 16.68 +71 10 10.6
3. 08 57 34.11 +71 11 55.0
```
(Uncertainty of all coordinates are 1 arcsec.)
However, our images are more deep than DSS2(R), down to a limiting magnitude R~21, and at present time we cannot determine whether the sources are fading.
GCN Circular #16015
C. Pagani and K.L. Page (U. Leicester) report on behalf of the Swift-XRT = team:
We have analysed 4 ks of XRT data for the INTEGRAL detected GRB 140320C (Mereghetti et al. GCN Circ. 16007), from 19.5 s to 37.2 ks after the trigger. The data are entirely in Photon Counting (PC) mode. We detect an uncatalogued X-ray source. Using 1552 s of XRT Photon Counting mode data astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 134.39401, 71.19829, which is equivalent to:
```
RA(J2000) =3D=A0  08 57 34.56
Dec(J2000) =3D  71 11 53.9
```
with an uncertainty of 2.6 arcsec (radius, 90% confidence). This is 28 arcsec from the initial INTEGRAL position, within the INTEGRAL error circle. This is consistent with the optical source N3 from Volnova et al. (GCN 16012).
The source has faded from a count rate of 0.013 (+/- 0.003) at 20.5 ks after the INTEGRAL trigger to 0.003 (+0.002,-0.001) by 33.9 ks, so we confirm it as the X-ray afterglow.
This circular is an official product of the Swift-XRT team.
GCN Circular #16017
C. Pagani, K.L. Page and P.A. Evans report on behalf of the Swift-XRT team:
We have analysed 4.0 ks of XRT data for the INTEGRAL-detected burst: GRB 140320C, from 19.5 ks to 37.3 ks after the INTEGRAL trigger. The data are entirely in Photon Counting (PC) mode. An X-ray source is detected within the INTEGRAL error circle. Using 1552 s of PC mode data and 1 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 134.39421, +71.19839 which is equivalent to:
```
RA (J2000): 08h 57m 34.61s
Dec(J2000): +71d 11' 54.2"
```
with an uncertainty of 2.6 arcsec (radius, 90% confidence). This position is 27 arcsec from the INTEGRAL position.
The light curve can be modelled with a power-law decay with a decay index of alpha=2.8 (+1.0, -1.7).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.3 (+0.9, -0.3) and an absorption column consistent with the Galactic value of 3.6 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 5 x 10^-11 (5 x 10^-11) erg cm^-2 count^-1.
If the light curve continues to decay with a power-law decay index of 2.8, the count rate at T+24 hours will be 2.4 x 10^-4 count s^-1
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020371.
This circular is an official product of the Swift-XRT team.
GCN Circular #16021
S. R. Oates (UCL-MSSL) and J. K. Cannizzo (NASA/UMBC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 140320C 19435 s after the INTEGRAL trigger (Mereghetti et al., GCN Circ. 16007). No optical afterglow consistent with the XRT position (Pagani et al., GCN Circ. 16015; 16017) 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 initial exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white            20211        32984         1056         >22.1
v                20986        33302         1087         >20.5
u                19435        37277         1741         >21.4
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.07 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #16022
J. Y. Wei, L. P. Xin, Y. L. Qiu, J. S. Deng, J. Wang, X. H. Han, C. Wu, H. L. Huang, X. M. Meng, Y. F. Xuan and Y. Xu on behalf of EAFON report:
Mini-GWAC system is located at Xinglong observatory, National Astronomical Observatories, China, including 6 mounts and 12 Canon 85/f1.2 cameras. Each mount is equipped with 2 cameras. For each camera, the Apogee U9000X CCD was used, which gives about 400 square degree of FOV. The total field of view of this system is about 5000 sq.deg.
The field of INTERGRAL GRB 140320C (Mereghetti et al. GCN 16007) was monitored by Mini-GWAC system continuously during about 2 hrs before and 4 hrs after the burst. The exposure time for each frame is 10 sec.
No any new optical counterpart in single frame was detected down to the 5 sigma upper limit of 13.1 mag calibrated by nearby USNO B1.0 R2 mag, at the epoch of prompt emission phase. Combining 5 frames after the burst trigger initially with total exposure time of 50 sec gives a 5 sigma upper limit of 13.7 mag.
This message may be cited.
GCN Circular #16036
A.Volnova (IKI), E. Klunko (ISTP), I. Korobtsev (ISTP), M. Eselevich (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 140320C (Mereghetti et al., GCN 16007) with AZT-33IK telescope of Mondy observatory starting on Mar. 20 (UT) 15:12:44 and Mar. 23 (UT) 15:37:46. Several images of 120 s exposure in R-filter ere obtained in both epochs. After receiving all data sets we refined our measurements of the optical source N3 reported early as one of a possible afterglow candidate (Volnova et al., GCN 16012). Enhanced position of the source is (J2000) 08 57 34.40 +71 11 54.7 (uncertainty of 0.35" is each coordinate) is within XRT error circle and apart 1.1" of the center of XRT localization (Pagani et al., GCN 16017). A photometry of the source:
```
date       UT start   t-T0      Exp.  Filter  OT     err
                      (mid, days) (s)
2014-03-20 15:12:44  0.08918    1560  R       22.63  0.24
2014-03-20 15:38:46  0.12147    3840  R       23.14  0.28
2014-03-23 15:37:46  3.13782    6960  R       23.5   (3 sigma upper limit)
```
is based on two USNO-B1.0 stars (R2 mags)
```
N       Id                      RA               Dec.           R
1       1612-0081687            08:57:32.78     +71:12:43.9     18.9
3       1611-0081293            08:57:55.56     +71:10:05.6     18.8
```
Based on our photometry we confirm the source N3 (Volnova et al., GCN 16012) is the afterglow of GRB 140320C.
Finding chart can be found at http://grb.rssi.ru/GRB140320C/140320C_AZT33IK_fc.png

Back to JG's homepage

Jochen Greiner, last update: 25-Mar-2014 [Disclaimer]