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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"

5859 results found.

  1. GRB 230908A: Swift/BAT-GUANO detection of a long burst outside the coded FOV
  2. GRB 230911D: BALROG localization (Fermi Trigger 716111594/ GRB 230911329)
  3. Fermi GRB 230911B: Global MASTER-Net observations report
  4. GRB 230911A: Fermi GBM Final Real-time Localization
  5. GRB 230906A: AstroSat CZTI detection
  6. GRB 230908A: GRBAlpha detection
  7. LIGO/Virgo/KAGRA S230908b: one counterpart neutrino candidate from IceCube neutrino searches
  8. GRB 230908A: AstroSat CZTI detection
  9. Glowbug gamma-ray detection GRB 230905B
  10. GRB 230905B: AstroSat CZTI detection
  11. Fermi GRB 230906A: Global MASTER-Net observations report
  12. GRB 230905B: GECAM-C detection of a long burst
  13. Fermi trigger No 715552087: Global MASTER-Net observations report
  14. Fermi trigger No 715429986: Global MASTER-Net observations report
  15. Fermi GRB 230903A: Global MASTER-Net observations report
  16. LIGO/Virgo/KAGRA S230904n: 1 counterpart neutrino candidate from IceCube neutrino searches
  17. Fermi GRB 230904A: Global MASTER-Net observations report
  18. LIGO/Virgo/KAGRA S230904n: Identification of a GW compact binary merger candidate
  19. Swift GRB230903.72: Global MASTER-Net observations report
  20. Integral GRB230902.00: Global MASTER-Net observations report
  21. GRB 230827A: VZLUSAT-2 detection
  22. Fermi GRB 230827A: Global MASTER-Net observations report
  23. Swift J1727.8-1613 (GRB 230824A): Skynet Optical Observations
  24. Trigger 1187142: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  25. LIGO/Virgo/KAGRA S230825k: Identification of a GW compact binary merger candidate
  26. Trigger 1186982: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  27. GRB 230824A: Swift detection of a burst
  28. GRB 230812B: SAO RAS RC-500 and Zeiss-1000 observations
  29. Swift GRB230820.81: Global MASTER-Net observations report
  30. Swift Triggers 1186280 and 1186291 are not GRBs
  31. LIGO/Virgo/KAGRA S230819ax: Identification of a GW compact binary merger candidate
  32. Fermi GRB 230818A: Global MASTER-Net observations report
  33. GRB 230815A: Swift detection of a burst
  34. LIGO/Virgo/KAGRA S230814ah: Identification of a GW compact binary merger candidate
  35. Fermi trigger No 713525317: Global MASTER-Net observations report
  36. GRB 230812A: Fermi GBM Final Real-time Localization
  37. LIGO/Virgo/KAGRA S230806ak: Identification of a GW compact binary merger candidate
  38. LIGO/Virgo/KAGRA S230805x: Identification of a GW compact binary merger candidate
  39. Fermi trigger No 712713532: Global MASTER-Net observations report
  40. GRB 230802A: Swift detection of a burst
  41. IceCube-230727A: No candidates from the Zwicky Transient Facility
  42. LIGO/Virgo/KAGRA S230729z: Identification of a GW compact binary merger candidate
  43. GRB 230728A: Swift detection of a burst
  44. IceCube Alert 230724.08: Global MASTER-Net observations report
  45. Fermi trigger No 711805358: Global MASTER-Net observations report
  46. GRB 230709C: GRBAlpha detection
  47. GRB 230709B: GRBAlpha detection
  48. GRB 230709C: Fermi GBM Detection
  49. GRB 230709C: Fermi GBM Final Localization
  50. GRB 230709C: AstroSat CZTI detection
  51. GRB 230709C: BALROG localization (Fermi Trigger 710617111 / GRB 230709735)
  52. GRB 230709B: BALROG localization (Fermi Trigger 710614579 / GRB 230709706)
  53. IceCube-230708A: Upper limits from a search for additional neutrino events in IceCube
  54. LIGO/Virgo/KAGRA S230709bi: Identification of a GW compact binary merger candidate
  55. LIGO/Virgo/KAGRA S230708cf: Identification of a GW compact binary merger candidate
  56. LIGO/Virgo/KAGRA S230704f: Identification of a GW compact binary merger candidate
  57. LIGO/Virgo/KAGRA S230630bq: Identification of a GW compact binary merger candidate
  58. LIGO/Virgo/Kagra S230627c: NED Galaxies in the Localization Volume
  59. IceCube-Cascade 230622A: Upper limits from a search for additional neutrino events in IceCube
  60. MAXI GRB 230623A: MASTER optical observations
  61. GRB 230623A: MAXI/GSC detection
  62. LIGO/Virgo S230622e: Global MASTER-Net observations report
  63. LIGO/Virgo S230621bq: Global MASTER-Net observations report
  64. LIGO/Virgo S230621ad: Global MASTER-Net observations report
  65. ZTF23aaoohpy/AT2023lcr: Montarrenti Observatory optical observations
  66. ZTF23aaoohpy/AT2023lc: Mondy optical observations
  67. ZTF23aaoohpy/AT2023lcr: Zwicky Transient Facility discovery of a fast fading red transient
  68. LIGO/Virgo S230619i: Global MASTER-Net observations report
  69. LIGO/Virgo S230618s: Global MASTER-Net observations report
  70. LIGO/Virgo S230618r: Global MASTER-Net observations report
  71. LIGO/Virgo S230616aa: Global MASTER-Net observations report
  72. LIGO/Virgo S230615ak: Global MASTER-Net observations report
  73. LIGO/Virgo S230618k: Global MASTER-Net observations report
  74. LIGO/Virgo S230618d: Global MASTER-Net observations report
  75. LIGO/Virgo S230617bc: Global MASTER-Net observations report
  76. LIGO/Virgo S230617aq: Global MASTER-Net observations report
  77. LIGO/Virgo S230617ab: Global MASTER-Net observations report
  78. LIGO/Virgo S230617aj: Global MASTER-Net observations report
  79. LIGO/Virgo/KAGRA S230615az: GOTO candidate counterparts
  80. GRB 230614B: Fermi GBM Observation
  81. Fermi trigger No 708426906: Global MASTER-Net observations report
  82. GRB 230614B: Fermi GBM Final Real-time Localization
  83. IceCube-Cascade 230610A: Upper limits from a search for additional neutrino events in IceCube
  84. LIGO/Virgo S230609u: Global MASTER-Net observations report
  85. LIGO/Virgo S230608aw: Global MASTER-Net observations report
  86. LIGO/Virgo/KAGRA S230609u: Identification of a GW compact binary merger candidate
  87. LIGO/Virgo S230608as: Global MASTER-Net observations report
  88. LIGO/Virgo S230609a: Global MASTER-Net observations report
  89. LIGO/Virgo S230608ah: Global MASTER-Net observations report
  90. LIGO/Virgo S230608q: Global MASTER-Net observations report
  91. Fermi trigger No 707039690: Global MASTER-Net observations report
  92. GRB 230606A: BOOTES-5/JGT optical upper limit
  93. IceCube-230603A: Upper limits from a search for additional neutrino events in IceCube
  94. LIGO/Virgo/KAGRA S230605o: Identification of a GW compact binary merger candidate
  95. LIGO/Virgo S230604z: Global MASTER-Net observations report
  96. LIGO/Virgo S230601bf: Global MASTER-Net observations report
  97. LIGO/Virgo S230529ay: Global MASTER-Net observations report
  98. LIGO/Virgo S230525a: Global MASTER-Net observations report
  99. Fermi-LAT gamma-ray observations of IceCube-230524A
  100. IceCube-230524A: Upper limits from a search for additional neutrino events in IceCube

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