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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"

19662 results found.

  1. Swift detection of Ginga 0834-430
  2. GRB 120624B: NOT optical upper limit
  3. Swift detection of IGR J17062-6143
  4. GRB 120624B: optical observations
  5. GRB 120624B, Swift-BAT refined analysis
  6. GRB 120624B: Swift detection of a burst
  7. GRB 120624B: Fermi-LAT Detection
  8. IPN Triangulation of GRB 120624A (short/intense)
  9. Swift Trigger 524949: Noise fluctuation near a galaxy
  10. Swift trigger 524642 / SwJ1910.2-0546
  11. GRB 120602A: Suzaku WAM observation of the prompt emission
  12. Swift Trigger 524642 is Swift J1910.2-0546
  13. Trigger 524584: Swift detection of Algol
  14. Swift triggers (#524542) on a Galactic source
  15. IPN Triangulation of GRB 120602A (long/very bright)
  16. GRB 120612A: Swift/UVOT observations
  17. GRB 120612A: Swift-XRT refined Analysis
  18. GRB 120612A: Swift-BAT refined analysis
  19. GRB 120612A: Enhanced Swift-XRT position
  20. GRB 120612A: BOOTES-3 optical upper limit
  21. GRB 120612A: Swift detection of a burst
  22. GRB 120603A: Suzaku WAM observation of the prompt emission
  23. GRB 120519A: Suzaku WAM observation of the prompt emission
  24. GRB 120512A: Suzaku WAM observation of the prompt emission
  25. GRB 120521C: EVLA Localization of Afterglow
  26. GRB 120521C: EVLA 22 GHz Detection
  27. GRB 120521B: Fermi GBM observation
  28. GRB 120521C: Early Tautenburg limits
  29. GRB 120521C: EVLA 22 GHz Upper Limit
  30. GRB 120521A: GROND Upper limits
  31. GRB 120521C: Swift-XRT refined Analysis
  32. GRB 120521C: Swift-BAT refined analysis
  33. GRB 120521C: Swift/UVOT Upper Limits
  34. GRB 120521B: Swift/UVOT Upper Limits
  35. GRB 120521C: MASTER optical limit
  36. GRB 120521B: GROND Upper limits
  37. GRB 120521A: XRT light curve (Correction to GCN 13326)
  38. GRB 120521A: Swift-XRT refined Analysis
  39. GRB 120521C: PAIRITEL NIR Upper Limits
  40. GRB 120521C: Enhanced Swift-XRT position
  41. GRB120521C: Liverpool Telescope observations
  42. GRB 120521C: TAROT Calern observatory optical observations
  43. GRB 120521C: Swift detection of a burst
  44. GRB 120521B: Swift-BAT refined analysis
  45. GRB 120521B: Swift-XRT refined Analysis
  46. Swift starts a new program to find fainter transients
  47. IPN Triangulation of GRB 120519A (short/hard)
  48. GRB 120521A: Swift/UVOT Upper Limits
  49. GRB 120521B: Enhanced Swift-XRT position
  50. GRB 120521A: Swift-BAT refined analysis
  51. GRB 120521B/Fermi Trigger 359284074: early MASTER-ICATE optical limit
  52. GRB120521B: Faulkes Telescope South observations
  53. GRB 120521B: TAROT La Silla observatory optical observations
  54. GRB 120521B: Swift detection of a burst
  55. GRB 120521A: Enhanced Swift-XRT position
  56. GRB 120521A: TAROT La Silla observatory optical observations
  57. GRB 120521A: Swift detection of a short burst
  58. GRB 120514A : Suzaku WAM observation of the prompt emission
  59. Swift Trigger 522245 is a noise fluctuation near IGR J17091-3624
  60. GRB 120514A: Swift/UVOT Upper Limits
  61. GRB 120514A: Swift-XRT refined Analysis
  62. GRB 120514A: Enhanced Swift-XRT position
  63. GRB 120514A: Swift-BAT refined analysis
  64. GRB 120514A: TAROT Calern observatory optical observations
  65. GRB 120514A: Swift detection of a burst
  66. GRB 120510A: Swift XRT and UVOT observations
  67. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  68. Swift detection of 4U 1630-47
  69. IPN Triangulation of bright GRB 120426A
  70. Swift Trigger 520928 is a noise event
  71. Swift Trigger 520928 is probably not a burst
  72. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  73. GRB 120422A GROND observations
  74. GRB 120422A: EVLA Detection
  75. GRB 120422A: Gemini redshift of candidate host
  76. GRB 120422A: Zadko observatory - Gingin optical observations
  77. GRB 120422A: Swift-XRT refined Analysis
  78. GRB 120422A: A Swift/UVOT Detection
  79. GRB 120422A: Enhanced Swift-XRT position
  80. GRB 120422A: Swift-BAT refined analysis
  81. GRB 120422A: Swift detection of a burst
  82. GRB 120419A: Swift-XRT and UVOT observations
  83. Swift Trigger 519874 is a noise event
  84. SGR1806-20, Swift-BAT refined analysis (Trigger 519868)
  85. Swift Trigger 519874 is probably a noise event
  86. Trigger 519868: Swift detection of SGR1806-20
  87. GRB 120404A: optical observations in Mondy observatory
  88. GRB 120404A: optical observations
  89. GRB 120404A, Optical Observations
  90. GRB 120404A: EVLA Detection
  91. GRB120404A: GROND observations show steeply decaying afterglow
  92. GRB120404A: MOA optical observations of the initial rise afterglow
  93. GRB 120404A: VLT/X-shooter redshift confirmation
  94. GRB 120404A: Swift/UVOT Detection
  95. GRB 120403B: Swift-XRT refined Analysis
  96. GRB 120404A: Swift-XRT refined Analysis
  97. GRB 120404A: Swift-BAT refined analysis
  98. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  99. GRB 120404A: Enhanced Swift-XRT position
  100. GRB 120403B: TAROT La Silla observatory optical observations

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