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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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').

2982 results found.

  1. Fermi trigger No 685452089: Global MASTER-Net observations report
  2. Fermi trigger No 684716840: Global MASTER-Net observations report
  3. Fermi GRB 220912A: Global MASTER-Net observations report
  4. IPN triangulation of GRB 220905A
  5. IceCube Alert 220907.28: Global MASTER-Net observations report
  6. GRB 220905A: BALROG localization (Fermi Trigger 684070128 / GRB 220905478)
  7. GRB 220905A: Fermi GBM Final Real-time Localization
  8. Fermi trigger No 683646997: Global MASTER-Net observations report
  9. Fermi trigger No 683537972: Global MASTER-Net observations report
  10. Fermi trigger No 683202084: Global MASTER-Net observations report
  11. Fermi trigger No 683183601: Global MASTER-Net observations report
  12. GRB 220823A: Fermi GBM detection
  13. Fermi trigger No 682918137: Global MASTER-Net observations report
  14. GRB 220823A: Swift/BAT-GUANO detection of a short burst
  15. IceCube Alert 220822.85: Global MASTER-Net observations report
  16. Fermi GRB 220810A: Global MASTER-Net observations report
  17. Fermi trigger No 681212354: Global MASTER-Net observations report
  18. Fermi trigger No 680782656: Global MASTER-Net observations report
  19. Fermi GRB 220728A: Global MASTER-Net observations report
  20. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220728A
  21. GRB 220728A: Fermi GBM Final Real-time Localization
  22. Fermi GRB 220724A: Global MASTER-Net observations report
  23. GRB 220715B: Fermi GBM detection
  24. GRB 220714B: Fermi GBM observation
  25. Fermi GRB 220711B: Global MASTER-Net observations report
  26. GRB 220711B: NOT optical observations
  27. GRB 220711B: Swift detection of a burst
  28. GRB 220711B: Fermi GBM Final Real-time Localization
  29. GRB 220708A: Swift detection of a burst
  30. GRB 220706A: Swift detection of a burst
  31. IceCube-220629A: Upper limits from a search for additional neutrino events in IceCube
  32. IceCube-220629A: No significant detection in HAWC
  33. IceCube-220627A: No significant detection in HAWC
  34. IceCube-220627A: Upper limits from a search for additional neutrino events in IceCube
  35. Swift XRT observations of WISEA J145820.77+412101.9 / IceCube 220624A
  36. GRB 220627A: MeerLICHT candidate optical afterglow
  37. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  38. Fermi trigger No 678058621: Global MASTER-Net observations report
  39. Fermi GRB 220623B: Global MASTER-Net observations report
  40. Swift Detection of MAXI J0655-013
  41. Fermi trigger No 677377371: Global MASTER-Net observations report
  42. Fermi GRB 220620A: Global MASTER-Net observations report
  43. GRB 220617A: Swift-XRT observations
  44. IPN triangulation of GRB 220606C
  45. Fermi trigger No 676909037: Global MASTER-Net observations report
  46. Fermi trigger No 676537486: Global MASTER-Net observations report
  47. Fermi GRB 220608A: Global MASTER-Net observations report
  48. Konus-Wind detection of GRB 220601A
  49. GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  50. GRB 220606B: Fermi GBM Final Real-time Localization
  51. Fermi trigger No 675992935: Global MASTER-Net observations report
  52. GRB 220527A: MITSuME Akeno continued optical observation
  53. GRB 220527A: Lick 3m Optical Observations
  54. GRB 220528A: Fermi GBM Observation
  55. Fermi GRB 220530A: Global MASTER-Net observations report
  56. GRB 220528A: Fermi GBM Final Localization
  57. GRB 220527A: REM optical/NIR observations
  58. GRB 220527A: VLT/X-shooter spectroscopic redshift
  59. Fermi trigger No 675411172: Global MASTER-Net observations report
  60. GRB 220527A: NOT optical photometry and spectroscopic redshift
  61. IPN triangulation of GRB 220522B
  62. GRB 220521A: ISON-Castelgrande observatory optical observations
  63. IPN triangulation of GRB 220519A
  64. Konus-Wind detection of GRB 220506A
  65. GRB 220514B: MAXI/GSC detection
  66. IceCube-220513A: No Candidate Counterparts from the Zwicky Transient Facility
  67. IceCube Alert 220513.97: Global MASTER-Net observations report
  68. Fermi GRB 220513A: Global MASTER-Net observations report
  69. GRB 220506A: MITSuME Akeno optical upper limits
  70. IceCube Alert 220509.76: Global MASTER-Net observations report
  71. GRB 220506A/MAXI J1558-266: MAXI/GSC detection
  72. IceCube-220421A: Upper limits from a search for additional neutrino events in IceCube
  73. GRB 220423A: Detection by VZLUSAT-2
  74. Fermi GRB 220426B: Global MASTER-Net observations report
  75. Fermi trigger No 672374264: Global MASTER-Net observations report
  76. Fermi trigger No 671729344: Global MASTER-Net observations report
  77. Konus-Wind detection of GRB 220412B
  78. GRB 220408B: Fermi GBM observation
  79. Konus-Wind detection of GRB 220408B
  80. GRB 220412A: Continued RATIR Observations and Steepening of the Light Curve
  81. GRB 220408B: Fermi-LAT detection
  82. GRB 220412B: MITSuME Akeno optical upper limits
  83. IPN triangulation of GRB 220408B
  84. Fermi GRB 220411A: Global MASTER-Net observations report
  85. GRB 220408B: AstroSat CZTI detection
  86. GRB 220408A: BOOTES-5/JGT optical afterglow detection
  87. Fermi GRB 220408B: Global MASTER-Net observations report
  88. GRB 220408B: Fermi GBM Final Localization
  89. IceCube Alert 220405.93: Global MASTER-Net observations report
  90. IceCube Alert 220405.21: Global MASTER-Net observations report
  91. GRB 220403B: Fermi GBM detection
  92. GRB 220404A: Swift detection of a burst
  93. Swift GRB 220403B: Global MASTER-Net observations report
  94. Fermi GRB 220403A: Global MASTER-Net observations report
  95. Fermi GRB 220401B: Global MASTER-Net observations report
  96. Fermi trigger No 670501065: Global MASTER-Net observations report
  97. GRB 220330A: Fermi GBM Final Real-time Localization
  98. ZTF22aaajecp/AT2022cmc: 1.3m DFOT Optical observations
  99. GRB 220324A: AstroSat CZTI detection
  100. IPN triangulation of GRB 220310A

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