Gamma-ray Burst 140521A

(All information courtesy of the instrument teams.)

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 21 May 14 17:34:33 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     599546,   Seg_Num: 0
GRB_RA:          320.013d {+21h 20m 03s} (J2000),
                 320.072d {+21h 20m 17s} (current),
                 319.805d {+21h 19m 13s} (1950)
GRB_DEC:         +67.602d {+67d 36' 06"} (J2000),
                 +67.663d {+67d 39' 47"} (current),
                 +67.389d {+67d 23' 19"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       1932 [cnts]    Image_Peak=110 [image_cnts]
TRIGGER_DUR:     0.512 [sec] 
TRIGGER_INDEX:   127     E_range: 50-350 keV
BKG_INTEN:       18525 [cnts]
BKG_TIME:        63243.96 SOD {17:34:03.96} UT
BKG_DUR:         8 [sec]
GRB_DATE:        16798 TJD;   141 DOY;   14/05/21
GRB_TIME:        63258.48 SOD {17:34:18.48} UT
GRB_PHI:         -123.69 [deg]
GRB_THETA:        30.23 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     21.00 [sigma]
IMAGE_SIGNIF:    7.49 [sigma]
MERIT_PARAMS:     +1  +0  +0  -1  +3  -2  +0  +0 -26  +0 
SUN_POSTN:        58.43d {+03h 53m 44s}  +20.27d {+20d 16' 19"}
SUN_DIST:         74.42 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      333.37d {+22h 13m 28s}   -6.38d {-06d 22' 51"}
MOON_DIST:        74.65 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      104.81, 12.52 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       26.11, 71.03 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 80.63,-1.03 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=422386461).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 21 May 14 17:34:55 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      46
TRIGGER_NUM:     422386461
GRB_RA:          318.850d {+21h 15m 24s} (J2000),
                 318.928d {+21h 15m 43s} (current),
                 318.579d {+21h 14m 19s} (1950)
GRB_DEC:         +63.667d {+63d 40' 00"} (J2000),
                 +63.727d {+63d 43' 37"} (current),
                 +63.457d {+63d 27' 27"} (1950)
GRB_ERROR:       7.20 [deg radius, statistical plus systematic]
GRB_INTEN:       278 [cnts/sec]
DATA_SIGNIF:     14.60 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        16798 TJD;   141 DOY;   14/05/21
GRB_TIME:        63258.73 SOD {17:34:18.73} UT
GRB_PHI:         252.00 [deg]
GRB_THETA:        45.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.45
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      87%  GRB
2nd_MOST_LIKELY:   8%  Cyg X-1
DETECTORS:       0,0,0, 0,0,0, 1,1,0, 0,0,0, 0,0,
SUN_POSTN:        58.43d {+03h 53m 44s}  +20.27d {+20d 16' 19"}
SUN_DIST:         75.99 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      333.37d {+22h 13m 28s}   -6.38d {-06d 22' 47"}
MOON_DIST:        70.95 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      101.55, 10.18 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       14.87, 69.78 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140521732/quicklook/glg_lc_medres34_bn140521732.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 344.85,21.60 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=599546).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 21 May 14 17:35:12 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     422386461
GRB_RA:          302.170d {+20h 08m 41s} (J2000),
                 302.252d {+20h 09m 00s} (current),
                 301.886d {+20h 07m 33s} (1950)
GRB_DEC:         +56.550d {+56d 32' 60"} (J2000),
                 +56.593d {+56d 35' 34"} (current),
                 +56.402d {+56d 24' 08"} (1950)
GRB_ERROR:       5.03 [deg radius, statistical only]
DATA_SIGNIF:     17.70 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16798 TJD;   141 DOY;   14/05/21
GRB_TIME:        63258.73 SOD {17:34:18.73} UT
GRB_PHI:         244.00 [deg]
GRB_THETA:        54.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:        58.43d {+03h 53m 44s}  +20.27d {+20d 16' 19"}
SUN_DIST:         86.48 [deg]   Sun_angle= 7.7 [hr] (West of Sun)
MOON_POSTN:      333.37d {+22h 13m 29s}   -6.38d {-06d 22' 44"}
MOON_DIST:        67.93 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:       90.72, 12.61 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      341.85, 72.01 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140521732/quicklook/glg_lc_medres34_bn140521732.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=599546).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 21 May 14 17:37:56 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     599546,   Seg_Num: 0
GRB_RA:          320.013d {+21h 20m 03s} (J2000),
                 320.072d {+21h 20m 17s} (current),
                 319.805d {+21h 19m 13s} (1950)
GRB_DEC:         +67.602d {+67d 36' 06"} (J2000),
                 +67.663d {+67d 39' 47"} (current),
                 +67.389d {+67d 23' 19"} (1950)
GRB_DATE:        16798 TJD;   141 DOY;   14/05/21
GRB_TIME:        63258.48 SOD {17:34:18.48} UT
TRIGGER_INDEX:   127
GRB_PHI:         -123.69 [deg]
GRB_THETA:        30.23 [deg]
DELTA_TIME:      -11.00 [sec]
TRIGGER_DUR:     0.512 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     21.00 [sigma]
IMAGE_SIGNIF:    7.49 [sigma]
LC_URL:          sw00599546000msb.lc
SUN_POSTN:        58.43d {+03h 53m 44s}  +20.27d {+20d 16' 20"}
SUN_DIST:         74.42 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      333.40d {+22h 13m 35s}   -6.37d {-06d 22' 15"}
MOON_DIST:        74.64 [deg]
MOON_ILLUM:      48 [%]
GAL_COORDS:      104.81, 12.52 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       26.11, 71.03 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 80.63,-1.03 [deg].

GCN Circular #16311
E. Troja (NASA/GSFC/UMCP), S. B. Cenko (GSFC), J. R. Cummings (NASA/UMBC), V. D'Elia (ASDC), L. M. Z. Hagen (PSU), L. Izzo (URoma/ICRA), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), V. Mangano (PSU), A. Melandri (INAF-OAB), P. T. O'Brien (U Leicester), K. L. Page (U Leicester), B. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU) and T. N. Ukwatta (MSU) report on behalf of the Swift Team:
At 17:34:18 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 140521A (trigger=599546). Swift did not slew to the burst due to an observing constraint. The BAT on-board calculated location is RA, Dec 320.013, +67.602 which is
```
   RA(J2000) = 21h 20m 03s
   Dec(J2000) = +67d 36' 06"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 12 sec. The peak count rate was ~3000 counts/sec (15-350 keV), at ~0.1 sec after the trigger.
Due to an observing constraint, Swift will not slew until 00:39UT on May 22. There will be no XRT or UVOT data until this time.
Burst Advocate for this burst is E. Troja (eleonora.troja AT nasa.gov). 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.)
GCN Circular #16312
V. Vladimirov, P.Balanutsa, E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, N.Shatskiy, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, D.Denisenko, A.Sankovich, A. Krylov, M.Pruzhinskaya Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University
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 Vostryakovo (Alexander Krylov Observatory) was pointed to the GRB140521A 4553 sec after trigger time at 2014-05-21 18:50:11 directly after sunset. We haven`t found optical transient within SWIFT error-box (Troja et. al GCN 16311) on single and coadd images. In table 1 the images upper limits are provided.
```
Table 1.
-------
T_start 	     Exptime   T-T_mead  T-T_start  T-T_stop  Filter  mlimit  Coadd
2014-05-21 18:50:11     15       4561       4553      4568     C      14.5     1*
2014-05-21 19:10:18    600       6531       5760      7302     C      18.0     10
2014-05-21 19:10:18   1020       7210       5760      8659     C      18.8     17
2014-05-21 19:38:52    600       8067       7474      8659     C      18.7     10
2014-05-21 20:07:53   1200      10390       9215     11566     C      19.4     20
-----------------------------------------------------------------------------------
* First image with stars on bright evening sky.
C is  our white (clear) band which is well described by a parity 0.8R+0.2B (USNO B1).
T is a  GRB trigger time.
```
Another two MASTER II robotic telescope located in Kislovodsk and Blagoveschensk was pointed to the GRB140521A 21 sec after notice time and 36 sec after trigger time at 2014-05-21 17:34:54 UT. But observations were spoiled due to bad weather condition. We have a set of images from that observatories with different exposures from 10 to 180 and formal upper limit from 13 to 16 during first hour after the burst. However bad quality of images (due to wind and clouds) don't allow to carry out transient search.
The message may be cited.
GCN Circular #16314
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of MITSuME and OISTER collaboration:
We observed the field of GRB 140521A (Troja et al., GCNC 16311) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started on 2014-05-21 17:35:25 (~68 sec after the burst). We did not find any new point source within the BAT circle (Troja et al., GCNC 16311) in all the three bands.
Three sigma upper limits of the OT are listed below. We used GSC 2.3 catalog for flux calibration.
```
#T0+[day]  MID-UT    T-EXP[sec]   g'     Rc     Ic
-----------------------------------------------------
0.02943    18:16:40    4320.0   >19.5  >19.3  >18.5
-----------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #16315
D. Kawamura, T. Sakamoto, I. Takahashi, A. Yoshida (AGU)
We observed the field of GRB 140521A detected by Swift (trigger #599546; Troja et al., GCN Circ. 16311) with the 12-inch AGU Robotic Optical Monitor for Astrophysical object - Narrow (AROMA-N) located at the Sagamihara campus of Aoyama Gakuin University.
15 images of 60 sec exposures were taken in the R filter starting from May 21 17:36:17 (UT) about 119 sec after the trigger (104 sec after the BAT position notice) and stopped on May 21 18:03:04 (UT). We do not detect the optical afterglow both in the individual images and the stacked image inside the BAT flight position (Troja, et al., GCN #16311). The estimated five sigma upper limit of the combined image (total exposure of 900 sec) is ~17.2 mag using the USNO-B1 catalog.
GCN Circular #16316
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (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), E. Troja (NASA/GSFC/UMCP), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 140521A (trigger #599546) (Troja, et al., GCN Circ. 16311). The BAT ground-calculated position is RA, Dec = 320.177, 67.587 deg, which is
```
   RA(J2000)  =  21h 20m 42.6s 
   Dec(J2000) = +67d 35' 12.7" 
```
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 55%.
The mask-weighted light curve shows a single peak starting at ~T-2 sec, peaking at ~T+1 sec, and ending at ~T+11 sec with a tail out to ~T+50 sec. T90 (15-350 keV) is 9.88 +- 1.09 sec (estimated error including systematics).
The time-averaged spectrum from T+0.15 to T+11.44 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.42 +- 0.11. The fluence in the 15-150 keV band is 9.5 +- 0.6 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.64 sec in the 15-150 keV band is 1.9 +- 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/599546/BA/
GCN Circular #16317
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 140521A(Troja et al., GCN 16311) with AS-32 (0.7m) telescope of Abastumani Observatory starting on May, 21 (UT) 18:12:00. We obtained several unfiltered frames with exposure of 120 s. Within the BAT ground-calculated position (Barthelmy et al., GCN 16316) we do not detect evident variable source. Since our stacked image is somewhat deeper than USNO-B1.0 we need one more epoch of observation.
The details of the photometry are the following:
```
UT start             t-T0         Filter   Exp.    Uplim
                     (mid, days)   (s)              (3 sigma)
2014-05-21 18:12:00  0.05746      None    28*120   21.2
```
and based on USNO-B1.0 star 1575-0248114 (21:20:10.32 +67:35:37.5) assuming R=15.70.
GCN Circular #16319
Matthew Stanbro (UAH) reports on behalf of the Fermi GBM Team:
"At 17:34:18.73 UT on 21 May 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 140521A (trigger 422386461 / 140521732) which was also detected by Swift (E. Troja et al. 2014, GCN 16311). The GBM on-ground location, using the Fermi GBM trigger data, is consistent with the Swift/BAT location.
The GBM light curve consists of one main episode with a total duration (T90) of about 11.5 s (50-300keV). The time-averaged spectrum from T0-0.864 s to T0+10.400 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -1.04 +/- 0.08 and the cutoff energy, parameterized as Epeak, is 273 +/- 44 keV.
The event fluence (10-1000 keV) in this time interval is (2.99 +/- 0.21)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0-0.10 s in the 10-1000 keV band is 3.9 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #16320
L. P. Xin, X. F. Wang, J. Y. Wei, Y. L. Qiu, J. S. Deng, J. Wang, X. H. Han and C. Wu on behalf of EAFON report:
We began to observe GRB 140521A (Troja et al., GCN 16311) with Xinglong 0.8-m TNT telescope at 15:35:50 (UT) , 92 sec after the burst.
No any optical transient was detected in our single or stacked image. The 3-sigma upper limit magnitude is about 18.4 mag at the mean time of 7.3 min , calibrated by nearby USNO B1.0 R2 mag.
The message may be cited.
GCN Circular #16372
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 second epoch of the field of the Swift GRB 140521A (Troja et al., GCN 16311) with AS-32 (0.7m) telescope of Abastumani Observatory starting on May, 22 (UT) 21:34:30. We obtained several unfiltered frames with exposure of 120 s. In comparison with our first epoch observation (Volnova et al., GCN 16317) we do not detect any variable source within the BAT ground-calculated position (Barthelmy et al., GCN 16316).
A photometry is based on the same reference star used in first epoch (see GCN 16311):
```
UT start            t-T0         Filter   Exp.    Uplim
                     (mid, days)           (s)     (3 sigma)

2014-05-22 21:34:30 1.12809      None    38*120   21.5
```

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Jochen Greiner, last update: 09-Jun-2014 [Disclaimer]