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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"

22194 results found.

  1. MAXI GRB220607.41: Global MASTER-Net observations report
  2. GRB 220606B: Swift follow-up observations
  3. Konus-Wind detection of GRB 220601A
  4. GRB 220606A: Swift/BAT-GUANO detection
  5. GRB 220527A: A BdHN I with a clear UPE phase
  6. GRB 220606B: Swift ToO observations
  7. GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  8. Fermi GRB 220606B: Global MASTER-Net observations report
  9. Fermi trigger No 675992935: Global MASTER-Net observations report
  10. GRB 220603A: Swift/BAT-GUANO detection outside the coded FOV
  11. GRB 220527A: Lick 3m Optical Observations
  12. Fermi GRB 220530A: Global MASTER-Net observations report
  13. Konus-Wind observation of GRB 220527A
  14. GRB 220528B: Swift/BAT-GUANO detection outside the coded FOV
  15. GRB 220527A: REM optical/NIR observations
  16. GRB 220527A: VLT/X-shooter spectroscopic redshift
  17. GRB 220527A: MeerLICHT afterglow observations
  18. Fermi trigger No 675411172: Global MASTER-Net observations report
  19. LAT GRB220527.39: Global MASTER-Net observations report
  20. GRB 220527A: Swift/UVOT detection
  21. GRB 220527A: Swift-XRT afterglow detection
  22. GRB 220527A: Swift ToO observations
  23. Swift GRB220526.48: Global MASTER-Net observations report
  24. Fermi GRB 220525A: Global MASTER-Net observations report
  25. Fermi-LAT Gamma-ray Observations of IceCube-220524A
  26. GRB 220521A: ATCA detection
  27. GRB 220521A: ALMA detection
  28. Konus-Wind detection of GRB 220522B
  29. Konus-Wind detection of GRB 220521B
  30. GRB 220521A: ISON-Castelgrande observatory optical observations
  31. Fermi GRB 220523B: Global MASTER-Net observations report
  32. GRB 220521A: Gemini Observations
  33. GRB 220521A: MMT Afterglow Imaging
  34. GRB 220521A: REM optical/NIR upper limits
  35. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  36. VLA observations of GW170817 at ~4.8 years after the merger
  37. Fermi GRB 220523A: Global MASTER-Net observations report
  38. GRB 220521A: RATIR Optical and NIR Observations
  39. GRB 220521A: Swift/UVOT Upper Limits
  40. Fermi GRB 220522A: Global MASTER-Net observations report
  41. Fermi trigger No 674868783: Global MASTER-Net observations report
  42. GRB 220521A: SAO RAS optical observations
  43. Swift GRB220521.97: Global MASTER-Net observations report
  44. Swift GRB220519.84: Global MASTER-Net observations report
  45. Fermi GRB 220518B: Global MASTER-Net observations report
  46. Continued Chandra monitoring of GW170817 at ~4.8 yr post-merger
  47. GRB 220518A: Swift/UVOT Detection
  48. Swift GRB 220518A: Global MASTER-Net observations report
  49. GRB 220514A: GRANDMA Optical Afterglow Observations
  50. Fermi trigger No 674397342: Global MASTER-Net observations report
  51. GRB 220514B: Swift-XRT observations
  52. GRB 220511A: Swift-XRT afterglow detection
  53. GRB 220514A: KAIT Optical Afterglow Confirmation
  54. Fermi-LAT Gamma-ray Observations of IceCube-220513A
  55. GRB 220514B: Tiled Swift observations
  56. MAXI GRB220514.98: Global MASTER-Net observations report
  57. Integral GRB220514.52: Global MASTER-Net observations report
  58. Fermi GRB 220514A: Global MASTER-Net observations report
  59. IceCube-220513A: No Candidate Counterparts from the Zwicky Transient Facility
  60. IceCube Alert 220513.97: Global MASTER-Net observations report
  61. Fermi GRB 220513A: Global MASTER-Net observations report
  62. GRB 220427A: MeerLICHT afterglow observations
  63. GRB 220511A: Swift-XRT observations
  64. Fermi GRB 220512A: Global MASTER-Net observations report
  65. GRB 220511A: Swift ToO observations
  66. GRB 220511A: Swift/BAT-GUANO arcminute localization
  67. Fermi GRB 220511A: Global MASTER-Net observations report
  68. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  69. Fermi trigger No 673846271: Global MASTER-Net observations report
  70. IceCube Alert 220509.76: Global MASTER-Net observations report
  71. Fermi trigger No 673610950: Global MASTER-Net observations report
  72. GRB 220506A: Swift-XRT afterglow detection
  73. GRB 220506A: Tiled Swift observations
  74. IceCube-220405B - ZTF19aavnpjv unrelated
  75. Swift-BAT triggers 1105560-1 are not GRBs
  76. Swift GRB220506.51: Global MASTER-Net observations report
  77. MAXI GRB220506.27: Global MASTER-Net observations report
  78. GRB 220430A: Nanshan/NEXT optical upper limit
  79. GRB 220430A: Nanshan/HMT optical upper limit
  80. GRB 220427A: LCO Optical Observations
  81. Fermi-LAT Gamma-ray Observations of IceCube-220501A
  82. GRB 220427A: GRANDMA Early Optical Afterglow Detection
  83. IceCube-220501A: No Candidate Counterparts from the Zwicky Transient Facility
  84. IceCube Alert 220501.95: Global MASTER-Net observations report
  85. GRB 220501A: GRANDMA/TJML Optical Observations
  86. Swift GRB 220430A: Global MASTER-Net observations report
  87. GRB 220430A: GRANDMA observations
  88. GRB 220430A: Mondy and AbAO optical upper limits
  89. GRB 220430A: MeerLICHT optical upper limits
  90. GRB 220430A: Swift detection of a burst or Swift J0630.4+0932
  91. GRB 220426A: Swift-XRT and UVOT observations
  92. GRB 220426A: Tiled Swift observations
  93. Konus-Wind detection of GRB 220426A
  94. GRB 220426C: Swift/BAT-GUANO detection outside the coded FOV (short)
  95. Fermi GRB 220426A: Global MASTER-Net observations report
  96. GRB 220426A: Swift/BAT-GUANO detection outside the coded FOV
  97. Fermi-LAT Gamma-ray Observations of IceCube-220425A
  98. Fermi GRB 220426B: Global MASTER-Net observations report
  99. IceCube-220425A: MASTER: flaring blazar TXS 1742-078 as the possible neutrino source candidate
  100. Fermi-LAT Gamma-ray Observations of IceCube-220424A

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