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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"

32706 results found.

  1. IceCube-220624A: No significant detection in HAWC
  2. GRB 220623A: GIT optical upper limits.
  3. GRB 220624A: CALET Gamma-Ray Burst Monitor detection
  4. GRB 220623A: T193-OHP optical upper limit
  5. IceCube-220624A: No Candidate Counterparts from the Zwicky Transient Facility
  6. GRB 220624A: Fermi GBM Detection
  7. Fermi GRB 220623B: Global MASTER-Net observations report
  8. Fermi GRB 220624A: Global MASTER-Net observations report
  9. IPN triangulation of GRB 220624A
  10. GRB 220623A: Swift-BAT refined analysis
  11. GRB 220624A: Swift/BAT-GUANO detection outside the coded FOV
  12. GRB 220611A: X-ray afterglow Chandra sub-arcsecond localization
  13. GRB 220624A: AGILE/GRID analysis
  14. GRB 220624A: AGILE detection
  15. Konus-Wind detection of GRB 220623A
  16. GRB 220623A: AbAO optical upper limit
  17. GRB 220623A: Swift-XRT refined Analysis
  18. GRB 220623A: NOT optical observations
  19. GRB 220623A: Swift/UVOT Upper Limits
  20. Konus-Wind detection of GRB 220609B
  21. GRB 220623A: AGILE detection
  22. GRB 220623A: AstroSat CZTI detection
  23. GRB 220623A: iTelescope optical upper limit
  24. GRB 220618A: Fermi GBM detection
  25. Swift Detection of MAXI J0655-013
  26. GRB 220618A: Swift-BAT refined analysis
  27. GRB 220618A: iTelescope T-19 upper limit
  28. Konus-Wind detection of GRB 220617A
  29. Fermi GRB 220620B: Global MASTER-Net observations report
  30. Fermi GRB 220620A: Global MASTER-Net observations report
  31. GRB 220611A: Continued Gemini Infrared Observations
  32. GRB 220617A: TNG optical observations
  33. GRB 220617A: Fermi GBM observation
  34. GRB 220611A optical counterpart
  35. GRB 220618A: Swift-XRT refined Analysis
  36. IPN triangulation of GRB 220617A (short)
  37. GRB 220618A: Swift/UVOT Upper Limits
  38. GRB220611A: Gemini Optical Afterglow Confirmation
  39. GRB 220617A: Swift-XRT observations
  40. GRB 220617A: Fermi-LAT detection
  41. GRB 220617B: Swift ToO observations
  42. Fermi GRB 220617A: Global MASTER-Net observations report
  43. GRB 220611A: Gemini Ks counterpart detection
  44. Konus-Wind detection of GRB 220613A
  45. IPN triangulation of GRB 220613A
  46. GRB 220611A: Gemini South Infrared Detection
  47. IPN triangulation of GRB 220606C
  48. GRB 220611A: Swift/UVOT Upper Limits
  49. GRB 220612A: CALET Gamma-Ray Burst Monitor detection
  50. GRB 220611A: Swift-BAT refined analysis
  51. Swift GRB 220611A: Global MASTER-Net observations report
  52. GRB 220611A: Swift-XRT refined Analysis
  53. IPN triangulation of GRB 220609B
  54. Fermi GRB 220610A: Global MASTER-Net observations report
  55. GRB 220609B: AstroSat CZTI detection
  56. GRB 220608A: AstroSat CZTI detection
  57. GRB 220606A: Fermi GBM observation
  58. Fermi GRB 220608A: Global MASTER-Net observations report
  59. GRB 220606B: Gemini South Optical Observations
  60. GRB 220606B: Fermi GBM Observation
  61. GRB 220606B: Swift follow-up observations
  62. Konus-Wind detection of GRB 220601A
  63. GRB 220606A: Swift/BAT-GUANO detection
  64. GRB 220606B: GUANO coordinate correction to GCN 32167
  65. GRB 220527A: A BdHN I with a clear UPE phase
  66. GRB 220606B: Swift ToO observations
  67. GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  68. Fermi GRB 220606B: Global MASTER-Net observations report
  69. IPN triangulation of GRB 220601A (long)
  70. Fermi-GBM will trial new SAA regions from Tuesday June 7th
  71. GRB 220527A: MITSuME Akeno continued optical observation
  72. GRB 220527A: Lick 3m Optical Observations
  73. Konus-Wind detection of GRB 220528A
  74. IPN triangulation of GRB 220528A (short)
  75. GRB 220528A: Fermi GBM Observation
  76. Fermi GRB 220530A: Global MASTER-Net observations report
  77. Konus-Wind observation of GRB 220527A
  78. Correction to GCN 32148: Should be GRB 220528A
  79. GRB 220528B: Swift/BAT-GUANO detection outside the coded FOV
  80. GRB 220527A: AST3-3 Yaoan Optical Observation
  81. GRB 220527A: REM optical/NIR observations
  82. GRB 220527A: VLT/X-shooter spectroscopic redshift
  83. GRB 220527A: MeerLICHT afterglow observations
  84. GRB 220527A: NOT optical photometry and spectroscopic redshift
  85. GRB 220527A: AstroSat CZTI detection
  86. GRB 220527A: CALET Gamma-Ray Burst Monitor detection
  87. GRB 220527A: MITSuME Akeno optical observation
  88. GRB 220527A: Swift/UVOT detection
  89. GRB 220527A: Swift-XRT afterglow detection
  90. GRB 220527A: Fermi GBM Observation
  91. GRB 220527A: Swift ToO observations
  92. GRB 220527A: Fermi-LAT detection
  93. GRB 220521B: CALET Gamma-Ray Burst Monitor detection
  94. GRB 220525A: Fermi GBM Detection
  95. GRB 220525A: CALET Gamma-Ray Burst Monitor detection
  96. GRB 220523B: CALET Gamma-Ray Burst Monitor detection
  97. Konus-Wind detection of GRB 220524B
  98. Konus-Wind detection of GRB 220525A
  99. Konus-Wind detection of GRB 220524A
  100. Fermi GRB 220525A: Global MASTER-Net observations report

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