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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

5164 results found.

  1. LIGO/Virgo S200219ac : No significant candidates in TAROT - FRAM - GRANDMA observations.
  2. LIGO/Virgo S200219ac: No counterpart candidates in KAIT observations
  3. GRB 200219C: Fermi GBM Final Real-time Localization
  4. GRB 200219A: Swift-XRT refined Analysis correction
  5. GRB 200216B: Swift-XRT refined Analysis
  6. LIGO/Virgo S200213t : No significant candidates in FRAM - OAJ - TAROT - GRANDMA observations
  7. GRB 200216A: Swift/BAT detection and arcminute localization from GUANO
  8. GRB 200215A: Swift-XRT refined Analysis
  9. GRB 200215A: Fermi GBM detection
  10. LIGO/Virgo S200213t: No neutrino candidates at Pierre Auger Observatory
  11. LIGO/Virgo S200213t: No counterpart candidates in KAIT observations
  12. LIGO/Virgo S200213t: No Counterparts in DDOTI/OAN Optical Observations
  13. LIGO/Virgo S200208q : No significant candidates in TAROT - FRAM - GRANDMA observations
  14. LIGO/Virgo trigger S200213t: Possible host galaxies
  15. LIGO/Virgo S200208q: No counterpart candidates in KAIT observations
  16. Fermi trigger No 602817262: Global MASTER-Net observations report
  17. GRB 200205B: Swift-XRT refined Analysis
  18. GRB 200205A: MAXI/GSC detection
  19. MAXI GRB200205.29: Global MASTER-Net observations report
  20. Swift GRB 200205A: Global MASTER-Net observations report
  21. Fermi trigger No 602455182: Global MASTER-Net observations report
  22. ZTF Discovery of ZTF20aajnksq: a Rapidly Fading Luminous Transient in the GRB 200128A Localiziation Region
  23. LIGO/Virgo S200128d: no counterpart candidate in SVOM/GWAC observations
  24. LIGO/Virgo S200128d : No significant candidates in FRAM - TAROT - GRANDMA observations
  25. LIGO/Virgo S200128d: No counterpart candidates in KAIT observations
  26. GRB 200127A: Swift-XRT refined Analysis
  27. Fermi trigger No 601841483: Global MASTER-Net observations report
  28. Fermi trigger No 601729856: Global MASTER-Net observations report
  29. Fermi trigger No 601677816: Global MASTER-Net observations report
  30. Correction to GRB 200125A: Swift-XRT refined analysis
  31. LIGO/Virgo S200114f : No significant candidates in TAROT - FRAM - GRANDMA observations
  32. Fermi trigger No 601363105: Global MASTER-Net observations report
  33. LIGO/Virgo S200115j: Further Swift-XRT sources
  34. GRB 200122A: Swift-XRT refined Analysis
  35. Fermi trigger No 601254300: Global MASTER-Net observations report
  36. LIGO/Virgo S200105ae: Upper limits from Konus-Wind observations
  37. LIGO/Virgo S200115j: No counterpart detection within possible host galaxies observed by the GRAWITA-Savelli telescope
  38. LIGO/Virgo S200115j : No significant candidates in TAROT - FRAM - GRANDMA observations
  39. GRB 200115A: AROMA-N Optical Observation
  40. GRB 200117A: Fermi GBM Final Real-time Localization
  41. IceCube Alert 200117.46: Global MASTER-Net observations report
  42. LIGO/Virgo S200115j: Swift-XRT sources
  43. LIGO/Virgo S200112r : No significant candidates in TAROT - FRAM - GRANDMA observations.
  44. LIGO/Virgo S200115j: No neutrino candidates at Pierre Auger Observatory
  45. LIGO/Virgo S200114f: Swift-XRT sources and observations
  46. LIGO/Virgo S200115j: no counterpart candidate in SVOM/GWAC observations
  47. Baksan Neutrino Observatory Alert 200116.22: Global MASTER-Net observations report
  48. LIGO/Virgo S200115j: INTEGRAL was inactive at the time of the event
  49. LIGO/Virgo trigger S200115j: Possible host galaxies
  50. LIGO/Virgo S200114f: SAGUARO previous detection of ZTF candidate ZTF20aafeaqk (AT2020vx)
  51. IceCube-200109A: Candidate Counterparts from the Zwicky Transient Facility
  52. LIGO/Virgo S200114f: Candidates from the Zwicky Transient Facility
  53. Fermi trigger No 600666048: Global MASTER-Net observations report
  54. GRB 200112A: Fermi GBM Final Real-time Localization
  55. LIGO/Virgo S200105ae : No significant candidates in TAROT - FRAM - GRANDMA observations.
  56. Fermi-LAT ANTARES coincidence /ANTARES alert 200108.39: MASTER alert and inspect observation
  57. GRB 200109A: Swift-XRT refined Analysis
  58. IceCube-200107A: No significant detection in HAWC
  59. IceCube-200107A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  60. LIGO/Virgo S200105ae: Upper limits from CALET observations.
  61. GRB 200107B: Swift detection of a burst
  62. LIGO/Virgo S200105ae: Further study ongoing for GW compact binary merger candidate
  63. LIGO/Virgo 200105ae: No counterpart candidates in Fermi-LAT observations
  64. LIGO/Virgo S200105ae: AstroSat CZTI upper limits
  65. LIGO/Virgo S200105ae: Coverage and upper limits from MAXI/GSC observations
  66. LIGO/Virgo S200105ae: no counterpart candidates in the Swift/BAT observations
  67. LIGO/Virgo S200105ae: not observable by AGILE-MCAL
  68. LIGO/Virgo S200105ae: Global MASTER-Net observations report
  69. LIGO/Virgo S200105ae: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  70. LIGO/Virgo S200105ae : no neutrino counterpart candidate in ANTARES search
  71. LIGO/Virgo S200105ae: A subthreshold GW compact binary merger candidate
  72. Fermi trigger No 599954133: Global MASTER-Net observations report
  73. IceCube Alert 200101.46: Global MASTER-Net observations report
  74. GRB 191228A: Swift-XRT refined Analysis
  75. GRB 191227A: Fermi GBM Final Real-time Localization
  76. LIGO/Virgo S191213g: AT2019wxt 10.4m GTC further spectroscopy
  77. LIGO/Virgo S191205ah: MASTER OT detection
  78. LIGO/Virgo S191222n : No significant candidates in FRAM-TAROT-GRANDMA observations
  79. LIGO/Virgo S191222n: no counterpart candidate in SVOM/GWAC observations
  80. LIGO/Virgo S191216ap: No significant candidates found in Pan-STARRS observations
  81. GRB 191221B: Swift-XRT refined Analysis
  82. LIGO/Virgo S191213g : No significant candidates found in GRANDMA citizen science observations
  83. LIGO/Virgo S191222n: Coverage and upper limits from MAXI/GSC observations
  84. LIGO/Virgo S191222n: Global MASTER-Net observations report
  85. Baksan Neutrino Observatory Alert 191222.09: Global MASTER-Net observations report
  86. Swift GRB 191221B: Global MASTER-Net observations report
  87. Fermi trigger No 598648473: Global MASTER-Net observations report
  88. LIGO/Virgo S191216ap : No significant candidates in FRAM-TAROT-GRANDMA observations
  89. GRB 191220A: Swift-XRT refined Analysis
  90. LIGO/Virgo S191220af: Global MASTER-Net observations report
  91. Konus-Wind observation of GRB 191218A
  92. LIGO/Virgo S191216ap, Swift XRT observations: 16 X-ray sources in the HAWC error region search
  93. LIGO/Virgo S191213g: No counterpart candidate in the NOWT observations
  94. LIGO/Virgo S191216ap: No candidates found in CHES observations of HAWC error region
  95. LIGO/Virgo S191216ap: No significant counterpart candidates in SAGUARO observations
  96. LIGO/Virgo S191215w : No significant candidates in TAROT - FRAM - GRANDMA observations.
  97. LIGO/Virgo S191213g: LCOGT photometry of ZTF19acymaru/AT2019wnh
  98. LIGO/Virgo S191213g: Lulin Follow-up Observations of ZTF19acykzsk/AT2019wqj
  99. LIGO/Virgo S191213g: Candidates from the Zwicky Transient Facility
  100. LIGO/Virgo S191213g: No neutrino candidates at Pierre Auger Observatory

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