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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"

5862 results found.

  1. GRB 230911B: GRBAlpha and VZLUSAT-2 joint detection
  2. Fermi trigger No 716145795: Global MASTER-Net observations report
  3. GRB 230911C: GOTO optical upper limits
  4. GRB 230908A: Swift/BAT-GUANO detection of a long burst outside the coded FOV
  5. GRB 230911D: BALROG localization (Fermi Trigger 716111594/ GRB 230911329)
  6. Fermi GRB 230911B: Global MASTER-Net observations report
  7. GRB 230911A: Fermi GBM Final Real-time Localization
  8. GRB 230906A: AstroSat CZTI detection
  9. GRB 230908A: GRBAlpha detection
  10. LIGO/Virgo/KAGRA S230908b: one counterpart neutrino candidate from IceCube neutrino searches
  11. GRB 230908A: AstroSat CZTI detection
  12. Glowbug gamma-ray detection GRB 230905B
  13. GRB 230905B: AstroSat CZTI detection
  14. Fermi GRB 230906A: Global MASTER-Net observations report
  15. GRB 230905B: GECAM-C detection of a long burst
  16. Fermi trigger No 715552087: Global MASTER-Net observations report
  17. Fermi trigger No 715429986: Global MASTER-Net observations report
  18. Fermi GRB 230903A: Global MASTER-Net observations report
  19. LIGO/Virgo/KAGRA S230904n: 1 counterpart neutrino candidate from IceCube neutrino searches
  20. Fermi GRB 230904A: Global MASTER-Net observations report
  21. LIGO/Virgo/KAGRA S230904n: Identification of a GW compact binary merger candidate
  22. Swift GRB230903.72: Global MASTER-Net observations report
  23. Integral GRB230902.00: Global MASTER-Net observations report
  24. GRB 230827A: VZLUSAT-2 detection
  25. Fermi GRB 230827A: Global MASTER-Net observations report
  26. Swift J1727.8-1613 (GRB 230824A): Skynet Optical Observations
  27. Trigger 1187142: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  28. LIGO/Virgo/KAGRA S230825k: Identification of a GW compact binary merger candidate
  29. Trigger 1186982: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  30. GRB 230824A: Swift detection of a burst
  31. GRB 230812B: SAO RAS RC-500 and Zeiss-1000 observations
  32. Swift GRB230820.81: Global MASTER-Net observations report
  33. Swift Triggers 1186280 and 1186291 are not GRBs
  34. LIGO/Virgo/KAGRA S230819ax: Identification of a GW compact binary merger candidate
  35. Fermi GRB 230818A: Global MASTER-Net observations report
  36. GRB 230815A: Swift detection of a burst
  37. LIGO/Virgo/KAGRA S230814ah: Identification of a GW compact binary merger candidate
  38. Fermi trigger No 713525317: Global MASTER-Net observations report
  39. GRB 230812A: Fermi GBM Final Real-time Localization
  40. LIGO/Virgo/KAGRA S230806ak: Identification of a GW compact binary merger candidate
  41. LIGO/Virgo/KAGRA S230805x: Identification of a GW compact binary merger candidate
  42. Fermi trigger No 712713532: Global MASTER-Net observations report
  43. GRB 230802A: Swift detection of a burst
  44. IceCube-230727A: No candidates from the Zwicky Transient Facility
  45. LIGO/Virgo/KAGRA S230729z: Identification of a GW compact binary merger candidate
  46. GRB 230728A: Swift detection of a burst
  47. IceCube Alert 230724.08: Global MASTER-Net observations report
  48. Fermi trigger No 711805358: Global MASTER-Net observations report
  49. GRB 230709C: GRBAlpha detection
  50. GRB 230709B: GRBAlpha detection
  51. GRB 230709C: Fermi GBM Detection
  52. GRB 230709C: Fermi GBM Final Localization
  53. GRB 230709C: AstroSat CZTI detection
  54. GRB 230709C: BALROG localization (Fermi Trigger 710617111 / GRB 230709735)
  55. GRB 230709B: BALROG localization (Fermi Trigger 710614579 / GRB 230709706)
  56. IceCube-230708A: Upper limits from a search for additional neutrino events in IceCube
  57. LIGO/Virgo/KAGRA S230709bi: Identification of a GW compact binary merger candidate
  58. LIGO/Virgo/KAGRA S230708cf: Identification of a GW compact binary merger candidate
  59. LIGO/Virgo/KAGRA S230704f: Identification of a GW compact binary merger candidate
  60. LIGO/Virgo/KAGRA S230630bq: Identification of a GW compact binary merger candidate
  61. LIGO/Virgo/Kagra S230627c: NED Galaxies in the Localization Volume
  62. IceCube-Cascade 230622A: Upper limits from a search for additional neutrino events in IceCube
  63. MAXI GRB 230623A: MASTER optical observations
  64. GRB 230623A: MAXI/GSC detection
  65. LIGO/Virgo S230622e: Global MASTER-Net observations report
  66. LIGO/Virgo S230621bq: Global MASTER-Net observations report
  67. LIGO/Virgo S230621ad: Global MASTER-Net observations report
  68. ZTF23aaoohpy/AT2023lcr: Montarrenti Observatory optical observations
  69. ZTF23aaoohpy/AT2023lc: Mondy optical observations
  70. ZTF23aaoohpy/AT2023lcr: Zwicky Transient Facility discovery of a fast fading red transient
  71. LIGO/Virgo S230619i: Global MASTER-Net observations report
  72. LIGO/Virgo S230618s: Global MASTER-Net observations report
  73. LIGO/Virgo S230618r: Global MASTER-Net observations report
  74. LIGO/Virgo S230616aa: Global MASTER-Net observations report
  75. LIGO/Virgo S230615ak: Global MASTER-Net observations report
  76. LIGO/Virgo S230618k: Global MASTER-Net observations report
  77. LIGO/Virgo S230618d: Global MASTER-Net observations report
  78. LIGO/Virgo S230617bc: Global MASTER-Net observations report
  79. LIGO/Virgo S230617aq: Global MASTER-Net observations report
  80. LIGO/Virgo S230617ab: Global MASTER-Net observations report
  81. LIGO/Virgo S230617aj: Global MASTER-Net observations report
  82. LIGO/Virgo/KAGRA S230615az: GOTO candidate counterparts
  83. GRB 230614B: Fermi GBM Observation
  84. Fermi trigger No 708426906: Global MASTER-Net observations report
  85. GRB 230614B: Fermi GBM Final Real-time Localization
  86. IceCube-Cascade 230610A: Upper limits from a search for additional neutrino events in IceCube
  87. LIGO/Virgo S230609u: Global MASTER-Net observations report
  88. LIGO/Virgo S230608aw: Global MASTER-Net observations report
  89. LIGO/Virgo/KAGRA S230609u: Identification of a GW compact binary merger candidate
  90. LIGO/Virgo S230608as: Global MASTER-Net observations report
  91. LIGO/Virgo S230609a: Global MASTER-Net observations report
  92. LIGO/Virgo S230608ah: Global MASTER-Net observations report
  93. LIGO/Virgo S230608q: Global MASTER-Net observations report
  94. Fermi trigger No 707039690: Global MASTER-Net observations report
  95. GRB 230606A: BOOTES-5/JGT optical upper limit
  96. IceCube-230603A: Upper limits from a search for additional neutrino events in IceCube
  97. LIGO/Virgo/KAGRA S230605o: Identification of a GW compact binary merger candidate
  98. LIGO/Virgo S230604z: Global MASTER-Net observations report
  99. LIGO/Virgo S230601bf: Global MASTER-Net observations report
  100. LIGO/Virgo S230529ay: Global MASTER-Net observations report

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