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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"

22202 results found.

  1. GRB 220612A: Swift/BAT-GUANO detection
  2. Swift GRB 220611A: Global MASTER-Net observations report
  3. Fermi GRB 220610A: Global MASTER-Net observations report
  4. Fermi trigger No 676537486: Global MASTER-Net observations report
  5. Fermi trigger No 676366592: Global MASTER-Net observations report
  6. Fermi GRB 220608A: Global MASTER-Net observations report
  7. GRB 220606B: Gemini South Optical Observations
  8. MAXI GRB220607.31: Global MASTER-Net observations report
  9. MAXI GRB220607.41: Global MASTER-Net observations report
  10. GRB 220606B: Swift follow-up observations
  11. Konus-Wind detection of GRB 220601A
  12. GRB 220606A: Swift/BAT-GUANO detection
  13. GRB 220527A: A BdHN I with a clear UPE phase
  14. GRB 220606B: Swift ToO observations
  15. GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  16. Fermi GRB 220606B: Global MASTER-Net observations report
  17. Fermi trigger No 675992935: Global MASTER-Net observations report
  18. GRB 220603A: Swift/BAT-GUANO detection outside the coded FOV
  19. GRB 220527A: Lick 3m Optical Observations
  20. Fermi GRB 220530A: Global MASTER-Net observations report
  21. Konus-Wind observation of GRB 220527A
  22. GRB 220528B: Swift/BAT-GUANO detection outside the coded FOV
  23. GRB 220527A: REM optical/NIR observations
  24. GRB 220527A: VLT/X-shooter spectroscopic redshift
  25. GRB 220527A: MeerLICHT afterglow observations
  26. Fermi trigger No 675411172: Global MASTER-Net observations report
  27. LAT GRB220527.39: Global MASTER-Net observations report
  28. GRB 220527A: Swift/UVOT detection
  29. GRB 220527A: Swift-XRT afterglow detection
  30. GRB 220527A: Swift ToO observations
  31. Swift GRB220526.48: Global MASTER-Net observations report
  32. Fermi GRB 220525A: Global MASTER-Net observations report
  33. Fermi-LAT Gamma-ray Observations of IceCube-220524A
  34. GRB 220521A: ATCA detection
  35. GRB 220521A: ALMA detection
  36. Konus-Wind detection of GRB 220522B
  37. Konus-Wind detection of GRB 220521B
  38. GRB 220521A: ISON-Castelgrande observatory optical observations
  39. Fermi GRB 220523B: Global MASTER-Net observations report
  40. GRB 220521A: Gemini Observations
  41. GRB 220521A: MMT Afterglow Imaging
  42. GRB 220521A: REM optical/NIR upper limits
  43. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  44. VLA observations of GW170817 at ~4.8 years after the merger
  45. Fermi GRB 220523A: Global MASTER-Net observations report
  46. GRB 220521A: RATIR Optical and NIR Observations
  47. GRB 220521A: Swift/UVOT Upper Limits
  48. Fermi GRB 220522A: Global MASTER-Net observations report
  49. Fermi trigger No 674868783: Global MASTER-Net observations report
  50. GRB 220521A: SAO RAS optical observations
  51. Swift GRB220521.97: Global MASTER-Net observations report
  52. Swift GRB220519.84: Global MASTER-Net observations report
  53. Fermi GRB 220518B: Global MASTER-Net observations report
  54. Continued Chandra monitoring of GW170817 at ~4.8 yr post-merger
  55. GRB 220518A: Swift/UVOT Detection
  56. Swift GRB 220518A: Global MASTER-Net observations report
  57. GRB 220514A: GRANDMA Optical Afterglow Observations
  58. Fermi trigger No 674397342: Global MASTER-Net observations report
  59. GRB 220514B: Swift-XRT observations
  60. GRB 220511A: Swift-XRT afterglow detection
  61. GRB 220514A: KAIT Optical Afterglow Confirmation
  62. Fermi-LAT Gamma-ray Observations of IceCube-220513A
  63. GRB 220514B: Tiled Swift observations
  64. MAXI GRB220514.98: Global MASTER-Net observations report
  65. Integral GRB220514.52: Global MASTER-Net observations report
  66. Fermi GRB 220514A: Global MASTER-Net observations report
  67. IceCube-220513A: No Candidate Counterparts from the Zwicky Transient Facility
  68. IceCube Alert 220513.97: Global MASTER-Net observations report
  69. Fermi GRB 220513A: Global MASTER-Net observations report
  70. GRB 220427A: MeerLICHT afterglow observations
  71. GRB 220511A: Swift-XRT observations
  72. Fermi GRB 220512A: Global MASTER-Net observations report
  73. GRB 220511A: Swift ToO observations
  74. GRB 220511A: Swift/BAT-GUANO arcminute localization
  75. Fermi GRB 220511A: Global MASTER-Net observations report
  76. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  77. Fermi trigger No 673846271: Global MASTER-Net observations report
  78. IceCube Alert 220509.76: Global MASTER-Net observations report
  79. Fermi trigger No 673610950: Global MASTER-Net observations report
  80. GRB 220506A: Swift-XRT afterglow detection
  81. GRB 220506A: Tiled Swift observations
  82. IceCube-220405B - ZTF19aavnpjv unrelated
  83. Swift-BAT triggers 1105560-1 are not GRBs
  84. Swift GRB220506.51: Global MASTER-Net observations report
  85. MAXI GRB220506.27: Global MASTER-Net observations report
  86. GRB 220430A: Nanshan/NEXT optical upper limit
  87. GRB 220430A: Nanshan/HMT optical upper limit
  88. GRB 220427A: LCO Optical Observations
  89. Fermi-LAT Gamma-ray Observations of IceCube-220501A
  90. GRB 220427A: GRANDMA Early Optical Afterglow Detection
  91. IceCube-220501A: No Candidate Counterparts from the Zwicky Transient Facility
  92. IceCube Alert 220501.95: Global MASTER-Net observations report
  93. GRB 220501A: GRANDMA/TJML Optical Observations
  94. Swift GRB 220430A: Global MASTER-Net observations report
  95. GRB 220430A: GRANDMA observations
  96. GRB 220430A: Mondy and AbAO optical upper limits
  97. GRB 220430A: MeerLICHT optical upper limits
  98. GRB 220430A: Swift detection of a burst or Swift J0630.4+0932
  99. GRB 220426A: Swift-XRT and UVOT observations
  100. GRB 220426A: Tiled Swift observations

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