Gamma-ray Burst 190415

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 15 Apr 19 04:10:15 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      49
TRIGGER_NUM:     576994194
GRB_RA:           26.883d {+01h 47m 32s} (J2000),
                  27.142d {+01h 48m 34s} (current),
                  26.212d {+01h 44m 51s} (1950)
GRB_DEC:         +13.883d {+13d 52' 60"} (J2000),
                 +13.979d {+13d 58' 44"} (current),
                 +13.634d {+13d 38' 03"} (1950)
GRB_ERROR:       6.60 [deg radius, statistical plus systematic]
GRB_INTEN:       957 [cnts/sec]
DATA_SIGNIF:     37.40 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        18588 TJD;   105 DOY;   19/04/15
GRB_TIME:        14989.96 SOD {04:09:49.96} UT
GRB_PHI:         355.00 [deg]
GRB_THETA:        80.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.40
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      94%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 1,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:        23.09d {+01h 32m 21s}   +9.65d {+09d 38' 49"}
SUN_DIST:          5.87 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      149.77d {+09h 59m 05s}  +15.47d {+15d 28' 01"}
MOON_DIST:       116.10 [deg]
MOON_ILLUM:      76 [%]
GAL_COORDS:      143.03,-46.79 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       29.91,  2.61 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190415173/quicklook/glg_lc_medres34_bn190415173.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 157.45,-25.28 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 15 Apr 19 04:10:26 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      60
TRIGGER_NUM:     576994194
GRB_RA:          318.383d {+21h 13m 32s} (J2000),
                 318.413d {+21h 13m 39s} (current),
                 318.302d {+21h 13m 12s} (1950)
GRB_DEC:         +71.783d {+71d 46' 60"} (J2000),
                 +71.864d {+71d 51' 49"} (current),
                 +71.575d {+71d 34' 31"} (1950)
GRB_ERROR:       3.70 [deg radius, statistical plus systematic]
GRB_INTEN:       2287 [cnts/sec]
DATA_SIGNIF:     87.80 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18588 TJD;   105 DOY;   19/04/15
GRB_TIME:        14989.96 SOD {04:09:49.96} UT
GRB_PHI:         350.00 [deg]
GRB_THETA:       150.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.00
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:     100%  Below horizon
2nd_MOST_LIKELY:   0%  n/a
DETECTORS:       0,0,0, 1,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:        23.09d {+01h 32m 21s}   +9.65d {+09d 38' 50"}
SUN_DIST:         73.11 [deg]   Sun_angle= 4.3 [hr] (West of Sun)
MOON_POSTN:      149.77d {+09h 59m 06s}  +15.47d {+15d 27' 59"}
MOON_DIST:        92.33 [deg]
MOON_ILLUM:      76 [%]
GAL_COORDS:      107.60, 15.75 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       38.72, 72.57 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190415173/quicklook/glg_lc_medres34_bn190415173.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 157.45,-25.28 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN Circular #24122
V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory
K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk Irkutsk State University
V. Yurkov, A. Gabovich, Yu. Sergienko Blagoveschensk Educational State University, Blagoveschensk
R. Podesta, Carlos Lopez and F. Podesta Observatorio Astronomico Felix Aguilar (OAFA)
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias
D. Buckley, S. Potter, A. Kniazev, M. Kotze South African Astronomical Observatory
MASTER-IAC robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Spain (IAC Teide Observatory) was pointed to the Fermi GRB190415.17 ( 21h 13m 31.99s , +71d 46m 59.88s, R=3.7) 61 sec after trigger time at 2019-04-15 04:10:51 UT, with upper limit up to 17.2 mag. The observations began at zenit distance = 57 deg. The sun altitude is -31.1 deg.
The galactic latitude b = -60 deg., longitude l = 98 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=999257
We obtain a following upper limits.

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)         |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|___________________________________|_____|_______|_______|________

      67 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 12m 18.38s , +71d 47m 07.16s) |  P- |    10 | 15.5 |        
      97 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 12m 18.40s , +71d 47m 07.18s) |  P- |    70 | 16.6 |  Coadd 
      67 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 14m 50.78s , +71d 44m 35.57s) |  P| |    10 | 15.6 |        
      97 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 14m 50.79s , +71d 44m 35.58s) |  P| |    70 | 16.8 |  Coadd 
     123 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 12m 18.90s , +71d 47m 06.96s) |  P- |    20 | 16.1 |        
     123 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 14m 51.38s , +71d 44m 35.78s) |  P| |    20 | 16.2 |        
     197 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 14m 51.70s , +71d 44m 36.31s) |  P| |    40 | 16.2 |        
     197 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 12m 19.26s , +71d 47m 06.90s) |  P- |    40 | 16.1 |        
     285 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 12m 19.57s , +71d 47m 06.89s) |  P- |    50 | 15.9 |        
     288 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 14m 51.87s , +71d 44m 36.65s) |  P| |    50 | 15.9 |        
     381 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 12m 19.70s , +71d 47m 06.81s) |  P- |    70 | 16.1 |        
     381 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 14m 51.95s , +71d 44m 36.87s) |  P| |    70 | 16.2 |        
    1090 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 20h 50m 47.19s , +69d 59m 58.53s) |   C |    60 | 17.2 |        
    1090 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 14m 41.45s , +69d 55m 43.47s) |   C |    60 | 17.1 |        
    1504 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 14m 41.16s , +69d 55m 43.01s) |   C |    60 | 16.7 |        
    1504 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 20h 50m 46.50s , +70d  0m 00.80s) |   C |    60 | 17.2 |        
    5462 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h  2m 05.56s , +73d 59m 24.36s) |   C |    60 | 14.6 |        
    5462 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 31m 32.07s , +73d 54m 50.58s) |   C |    60 | 14.5 |        
    5565 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 22h  1m 11.43s , +69d 55m 11.50s) |   C |    60 | 14.6 |        
    5565 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 37m 26.32s , +69d 59m 27.86s) |   C |    60 | 15.1 |        
    5667 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 31m 37.37s , +67d 55m 46.96s) |   C |    60 | 16.0 |        
    5805 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h  9m 55.23s , +67d 59m 40.96s) |   C |    60 | 16.2 |        
    5805 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 31m 37.52s , +67d 55m 26.22s) |   C |    60 | 15.7 |        
    5906 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h  2m 07.12s , +73d 59m 22.27s) |   C |    60 | 15.7 |        
    5906 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 31m 34.30s , +73d 54m 45.03s) |   C |    60 | 15.6 |        
    6031 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 22h  1m 12.40s , +69d 55m 09.83s) |   C |    60 | 14.9 |        
    6172 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 37m 26.38s , +69d 59m 25.91s) |   C |    60 | 15.6 |        
    6172 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 22h  1m 11.32s , +69d 55m 09.10s) |   C |    60 | 15.5 |        
    6279 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h  9m 56.03s , +67d 59m 40.54s) |   C |    60 | 15.7 |        
    6279 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 21h 31m 37.61s , +67d 55m 26.25s) |   C |    60 | 15.8 |        
    6385 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 20h  4m 13.68s , +74d  0m 30.87s) |   C |    60 | 15.4 |        
    6385 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 20h 33m 41.53s , +73d 55m 47.01s) |   C |    60 | 15.4 |        
    6489 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 20h 27m 19.45s , +68d  0m 51.65s) |   C |    60 | 15.9 |        
    6489 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 20h 49m 01.81s , +67d 56m 32.15s) |   C |    60 | 16.0 |        
    6597 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 20h 27m 51.21s , +69d 56m 46.05s) |   C |    60 | 15.9 |        
    6711 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 20h  4m 12.05s , +74d  0m 31.90s) |   C |    60 | 14.7 |        
    6852 | 2019-04-15 04:10:51 |          MASTER-IAC | ( 20h 27m 19.35s , +68d  0m 31.75s) |   C |    60 | 14.1 |

Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.

GCN Circular #24123
F. Kunzweiler, B. Biltzinger, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 576994194 at 04:09:49 on 15 April 2019 were automatically fitted for spectrum and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427; Berlato et al. 2019, ApJ 873, 60).
The best-fit position (1 sigma statistical errors) is:
```
RA(2000.0) = 24.9+/-0.7 deg
Decl.(2000.0) = 17.2+/-0.6 deg
```
We estimate an additional systematic error of 1 deg.
Further details are available at: https://grb.mpe.mpg.de/grb/GRB190415173/
The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB190415173/healpix
The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB190415173/json

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 15 Apr 19 11:52:45 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     576994194
GRB_RA:           27.710d {+01h 50m 50s} (J2000),
                  27.973d {+01h 51m 53s} (current),
                  27.030d {+01h 48m 07s} (1950)
GRB_DEC:         +17.430d {+17d 25' 48"} (J2000),
                 +17.525d {+17d 31' 30"} (current),
                 +17.183d {+17d 10' 58"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
GRB_DATE:        18588 TJD;   105 DOY;   19/04/15
GRB_TIME:        14989.96 SOD {04:09:49.96} UT
GRB_PHI:         353.03 [deg]
GRB_THETA:        83.07 [deg]
E_RANGE:         50.000 - 300.000 [keV]
LOC_ALGORITHM:   415 (Gnd S/W Version number)
SUN_POSTN:        23.38d {+01h 33m 32s}   +9.76d {+09d 45' 43"}
SUN_DIST:          8.95 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      154.40d {+10h 17m 37s}  +14.12d {+14d 07' 27"}
MOON_DIST:       118.40 [deg]
MOON_ILLUM:      79 [%]
GAL_COORDS:      142.52,-43.17 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       31.92,  5.64 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190415173/quicklook/glg_lc_medres34_bn190415173.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190415173/quicklook/glg_locplot_all_bn190415173.png
COMMENTS:        Fermi-GBM Final Position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file should be available by the time this FINAL notice is produced.  
COMMENTS:        This notice has human-in-the-loop processing.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=8255).

GCN Circular #24125
Q. Luo, C. Cai, S. Xiao, Q. B. Yi, C. K. Li, X. B. Li, G. Li, J. Y. Liao, S. L. Xiong, C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, X. F. Lu, A. M. Zhang, Y. F. Zhang, C. L. Zou (IHEP), Y. J. Jin, Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song, M. Wu, Y. P. Xu, S. N. Zhang (IHEP), report on behalf of the Insight-HXMT team:
At 2019-04-15T04:09:49.900 (T0), the Insight-HXMT/HE detected GRB 190415A(trigger ID: HEB190415173) in a routine search of the data, which was also triggered by Fermi/GBM(F. Kunzweiler et al. ,GCN 24123) and INTEGRAL.
The Insight-HXMT/HE light curve mainly consists of multiple pulses with a duration (T90) of 24.74 s measured from T0+0.89 s. The 1-ms peak rate, measured from T0+4.001 s, is 17011 cnts/sec. The total counts from this burst is 100520 counts. URL_LC: http://www.hxmt.org/images/GRB/HEB190415173_lc.jpg
All measurements above are made with the CsI detectors operating in the regular mode with the energy range of about 80-800 keV (record energy). Only gamma-rays with energy greater than about 200 keV can penetrate the spacecraft and leave signals in the CsI detectors installed inside of the telescope.
Insight-HXMT is the first Chinese space X-ray telescope, which was fundedjointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information about it could be found at: http://www.hxmt.org.
GCN Circular #24128
D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Kozlova, and T. Cline on behalf of the Konus-Wind team,
K. Hurley, on behalf of the IPN,
A. Goldstein, M. S. Briggs, and C. Wilson-Hodge on behalf of the Fermi GBM team,
A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
and
S. Barthelmy, J. Cummings, H. Krimm, and D. Palmer, on behalf of the Swift-BAT team, report:
The long-duration GRB 190415A (Insight-HXMT/HE detection: Luo et al., GCN Circ. 24125) was detected by Fermi (GBM trigger 576994194), INTEGRAL (SPI-ACS), Konus-Wind, Swift (BAT), and Insight (HXMT/HE) at about 14990 s UT (04:09:50). The burst was outside the coded field of view of the BAT.
We have triangulated it to a preliminary, 3 sigma error box whose coordinates are:
```
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
    28.053 (01h 52m 13s) +20.221 (+20d 13' 16")
  Corners:
    26.606 (01h 46m 25s) +21.774 (+21d 46' 27")
    27.221 (01h 48m 53s) +22.093 (+22d 05' 34")
    29.374 (01h 57m 30s) +18.606 (+18d 36' 22")
    28.770 (01h 55m 05s) +18.296 (+18d 17' 44")
  ---------------------------------------------
```
The error box area is about 2.6 sq. deg, and its maximum dimension is 4.1 deg (the minimum one is 39 arcmin). The Sun distance was about 10 deg.
This box may be improved.
The box lies outside the 1 sigma of the alternative localization of the Fermi-GBM detection BALROG (Kunzweiler et al., GCN Circ. 24123; ~0.6 deg stat. + 1 deg sys.), while being consistent with 1 sigma contours of the Fermi-GBM final position.
A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB190415_T14986/IPN
The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.
GCN Circular #24138
D. Frederiks, S. Golenetskii, R.Aptekar, A. Kozlova, A.Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report:
The long GRB 190415A (Insight-HXMT/HE detection: Luo et al., GCN 24125; IPN triangulation: Svinkin et al., GCN 24128) triggered Konus-Wind (KW) at T0=14986.024 s UT (04:09:46.024).
The light curve of the burst shows a bright, hard-spectrum, multi-peaked pulse, which started at ~T0 s and had a duration of ~ 19s. This pulse was followed by a weaker and softer emission tail of the emission detectable until ~T0+57 s. The emission is seen up to ~2 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB190415_T14986/
As observed by Konus-Wind, the burst had a fluence of (8.8 � 0.8)x10^-5 erg/cm2 and a 64-ms peak energy flux, measured from T0+5.824, of (2.33 � 0.14)x10^-5 erg/cm2 (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum (measured from T0 to T0+56.512 s) is best fit in the 20 keV - 15 MeV range by a cutoff power-law (CPL) function with the following model parameters: the photon index alpha = -0.65(-0.10,+0.11), and the peak energy Ep = 892(-99,+120) keV, chi2 = 94/98 dof. Fitting this spectrum with the GRB (Band) function yields the same alpha and Ep, and an upper limit on beta (-3.1).
The spectrum near the peak count rate (measured from T0 to T0+7.360) is best fit in the 20 keV - 15 MeV range by the CPL function with the following model parameters: the photon index alpha = -0.17(-0.09,+0.10), and the peak energy Ep = 994(-62,+67) keV, chi2 = 89/98 dof. Fitting this spectrum with the GRB (Band) function yields the same alpha and Ep, and an upper limit on beta (-3.8).
All the quoted errors are estimated at the 90% confidence level. All the presented results are preliminary.

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Jochen Greiner, last update: 15-Apr-2019 [Disclaimer]