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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"

22109 results found.

  1. Fermi GRB 220617A: Global MASTER-Net observations report
  2. GRB 220611A: Gemini Ks counterpart detection
  3. Fermi trigger No 677174940: Global MASTER-Net observations report
  4. Konus-Wind detection of GRB 220613A
  5. GRB 220611A: Gemini South Infrared Detection
  6. GRB 220611A: Swift/UVOT Upper Limits
  7. Fermi trigger No 676909037: Global MASTER-Net observations report
  8. GRB 220612A: Swift/BAT-GUANO detection
  9. Swift GRB 220611A: Global MASTER-Net observations report
  10. Fermi GRB 220610A: Global MASTER-Net observations report
  11. Fermi trigger No 676537486: Global MASTER-Net observations report
  12. Fermi trigger No 676366592: Global MASTER-Net observations report
  13. Fermi GRB 220608A: Global MASTER-Net observations report
  14. GRB 220606B: Gemini South Optical Observations
  15. MAXI GRB220607.31: Global MASTER-Net observations report
  16. MAXI GRB220607.41: Global MASTER-Net observations report
  17. GRB 220606B: Swift follow-up observations
  18. Konus-Wind detection of GRB 220601A
  19. GRB 220606A: Swift/BAT-GUANO detection
  20. GRB 220527A: A BdHN I with a clear UPE phase
  21. GRB 220606B: Swift ToO observations
  22. GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  23. Fermi GRB 220606B: Global MASTER-Net observations report
  24. Fermi trigger No 675992935: Global MASTER-Net observations report
  25. GRB 220603A: Swift/BAT-GUANO detection outside the coded FOV
  26. GRB 220527A: Lick 3m Optical Observations
  27. Fermi GRB 220530A: Global MASTER-Net observations report
  28. Konus-Wind observation of GRB 220527A
  29. GRB 220528B: Swift/BAT-GUANO detection outside the coded FOV
  30. GRB 220527A: REM optical/NIR observations
  31. GRB 220527A: VLT/X-shooter spectroscopic redshift
  32. GRB 220527A: MeerLICHT afterglow observations
  33. Fermi trigger No 675411172: Global MASTER-Net observations report
  34. LAT GRB220527.39: Global MASTER-Net observations report
  35. GRB 220527A: Swift/UVOT detection
  36. GRB 220527A: Swift-XRT afterglow detection
  37. GRB 220527A: Swift ToO observations
  38. Swift GRB220526.48: Global MASTER-Net observations report
  39. Fermi GRB 220525A: Global MASTER-Net observations report
  40. Fermi-LAT Gamma-ray Observations of IceCube-220524A
  41. GRB 220521A: ATCA detection
  42. GRB 220521A: ALMA detection
  43. Konus-Wind detection of GRB 220522B
  44. Konus-Wind detection of GRB 220521B
  45. GRB 220521A: ISON-Castelgrande observatory optical observations
  46. Fermi GRB 220523B: Global MASTER-Net observations report
  47. GRB 220521A: Gemini Observations
  48. GRB 220521A: MMT Afterglow Imaging
  49. GRB 220521A: REM optical/NIR upper limits
  50. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  51. VLA observations of GW170817 at ~4.8 years after the merger
  52. Fermi GRB 220523A: Global MASTER-Net observations report
  53. GRB 220521A: RATIR Optical and NIR Observations
  54. GRB 220521A: Swift/UVOT Upper Limits
  55. Fermi GRB 220522A: Global MASTER-Net observations report
  56. Fermi trigger No 674868783: Global MASTER-Net observations report
  57. GRB 220521A: SAO RAS optical observations
  58. Swift GRB220521.97: Global MASTER-Net observations report
  59. Swift GRB220519.84: Global MASTER-Net observations report
  60. Fermi GRB 220518B: Global MASTER-Net observations report
  61. Continued Chandra monitoring of GW170817 at ~4.8 yr post-merger
  62. GRB 220518A: Swift/UVOT Detection
  63. Swift GRB 220518A: Global MASTER-Net observations report
  64. GRB 220514A: GRANDMA Optical Afterglow Observations
  65. Fermi trigger No 674397342: Global MASTER-Net observations report
  66. GRB 220514B: Swift-XRT observations
  67. GRB 220511A: Swift-XRT afterglow detection
  68. GRB 220514A: KAIT Optical Afterglow Confirmation
  69. Fermi-LAT Gamma-ray Observations of IceCube-220513A
  70. GRB 220514B: Tiled Swift observations
  71. MAXI GRB220514.98: Global MASTER-Net observations report
  72. Integral GRB220514.52: Global MASTER-Net observations report
  73. Fermi GRB 220514A: Global MASTER-Net observations report
  74. IceCube-220513A: No Candidate Counterparts from the Zwicky Transient Facility
  75. IceCube Alert 220513.97: Global MASTER-Net observations report
  76. Fermi GRB 220513A: Global MASTER-Net observations report
  77. GRB 220427A: MeerLICHT afterglow observations
  78. GRB 220511A: Swift-XRT observations
  79. Fermi GRB 220512A: Global MASTER-Net observations report
  80. GRB 220511A: Swift ToO observations
  81. GRB 220511A: Swift/BAT-GUANO arcminute localization
  82. Fermi GRB 220511A: Global MASTER-Net observations report
  83. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  84. Fermi trigger No 673846271: Global MASTER-Net observations report
  85. IceCube Alert 220509.76: Global MASTER-Net observations report
  86. Fermi trigger No 673610950: Global MASTER-Net observations report
  87. GRB 220506A: Swift-XRT afterglow detection
  88. GRB 220506A: Tiled Swift observations
  89. IceCube-220405B - ZTF19aavnpjv unrelated
  90. Swift-BAT triggers 1105560-1 are not GRBs
  91. Swift GRB220506.51: Global MASTER-Net observations report
  92. MAXI GRB220506.27: Global MASTER-Net observations report
  93. GRB 220430A: Nanshan/NEXT optical upper limit
  94. GRB 220430A: Nanshan/HMT optical upper limit
  95. GRB 220427A: LCO Optical Observations
  96. Fermi-LAT Gamma-ray Observations of IceCube-220501A
  97. GRB 220427A: GRANDMA Early Optical Afterglow Detection
  98. IceCube-220501A: No Candidate Counterparts from the Zwicky Transient Facility
  99. IceCube Alert 220501.95: Global MASTER-Net observations report
  100. GRB 220501A: GRANDMA/TJML Optical Observations

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