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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"

28132 results found.

  1. Konus-Wind observation of GRB 120528B
  2. GRB 120519A: Suzaku WAM observation of the prompt emission
  3. GRB 120528B: MAXI/GSC detection
  4. GRB 120512A: Suzaku WAM observation of the prompt emission
  5. GRB120521B: SSO 2.3m upper limits
  6. GRB 120521B: Fermi GBM observation
  7. GRB 120521C: Early Tautenburg limits
  8. GRB 120521A: GROND Upper limits
  9. GRB 120521C: Swift-XRT refined Analysis
  10. GRB 120521C: Swift-BAT refined analysis
  11. GRB 120521C: Keck Observations
  12. GRB 120521C: Swift/UVOT Upper Limits
  13. GRB 120521B: Swift/UVOT Upper Limits
  14. GRB 120521B: GROND Upper limits
  15. GRB 120521A: Swift-XRT refined Analysis
  16. GRB 120521C: PAIRITEL NIR Upper Limits
  17. GRB 120521C: Enhanced Swift-XRT position
  18. GRB 120521C: BOOTES-1 optical observations
  19. GRB 120521C - NOT optical limits
  20. GRB 120521C: TAROT Calern observatory optical observations
  21. GRB 120521C: Swift detection of a burst
  22. GRB 120521B: Swift-BAT refined analysis
  23. GRB 120521B: Swift-XRT refined Analysis
  24. Swift starts a new program to find fainter transients
  25. IPN Triangulation of GRB 120519A (short/hard)
  26. GRB 120521A: Swift/UVOT Upper Limits
  27. GRB 120521B: Enhanced Swift-XRT position
  28. GRB 120521A: Swift-BAT refined analysis
  29. GRB 120521B/Fermi Trigger 359284074: early MASTER-ICATE optical limit
  30. GRB 120521B: TAROT La Silla observatory optical observations
  31. GRB 120521B: Swift detection of a burst
  32. GRB 120521A: Enhanced Swift-XRT position
  33. GRB 120521A: TAROT La Silla observatory optical observations
  34. GRB 120521A: Swift detection of a short burst
  35. GRB 120514A : Suzaku WAM observation of the prompt emission
  36. GRB 120512A: A long GRB detected by INTEGRAL
  37. Swift Trigger 522245 is a noise fluctuation near IGR J17091-3624
  38. GRB 120514A: GROND upper limits
  39. GRB 120514A: Swift/UVOT Upper Limits
  40. GRB 120514A: UKIRT IR observations
  41. Konus-Wind observation of GRB 120510A
  42. GRB 120514A: Swift-XRT refined Analysis
  43. GRB 120514A: APEX observations of the submm counterpart
  44. GRB 120514A: Enhanced Swift-XRT position
  45. GRB 120514A: Swift-BAT refined analysis
  46. GRB 120514A: TAROT Calern observatory optical observations
  47. GRB 120514A: Swift detection of a burst
  48. GRB 120422A: Konkoly optical observations
  49. Fermi Trigger 358364818: BOOTES-4 observations
  50. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
  51. GRB 120510A: Swift XRT and UVOT observations
  52. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  53. GRB 120422A: P200 NIR detection
  54. GRB 120422A: Gemini-N detection of a supernova
  55. GRB 120422A: optical observations
  56. Konus-Wind observation of GRB 120427A
  57. Swift detection of 4U 1630-47
  58. GRB 120422A, the review of the sky area in plate archives
  59. Konus-Wind observation of GRB 120426A
  60. GRB 120422A: Additional Gemini observations and Keck/LRIS spectroscopy
  61. IPN Triangulation of bright GRB 120426A
  62. GRB 120422A: MITSuME Ishigakijima upper limit
  63. Swift Trigger 520928 is probably not a burst
  64. GRB 120422A: 272 GHz observations from SMA
  65. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  66. GRB 120422A GROND observations
  67. GRB 120422A: Super-LOTIS early observations
  68. GRB 120422A: NOT optical observations
  69. GRB 120422A: Zadko observatory - Gingin optical observations
  70. GRB 120422A: Swift-XRT refined Analysis
  71. GRB 120422A: A Swift/UVOT Detection
  72. GRB 120422A: Enhanced Swift-XRT position
  73. GRB 120422A: Swift-BAT refined analysis
  74. GRB 120422A: Gemini observations
  75. GRB 120422A: Faulkes Telescope North observations
  76. GRB 120422A: Swift detection of a burst
  77. GRB 120419A: Swift-XRT and UVOT observations
  78. GRB 120419A: A long GRB detected by INTEGRAL
  79. SGR1806-20, Swift-BAT refined analysis (Trigger 519868)
  80. Swift Trigger 519874 is probably a noise event
  81. Trigger 519868: Swift detection of SGR1806-20
  82. GRB 120404A: optical observations in Mondy observatory
  83. GRB 120404A: optical observations
  84. GRB 120404A, Optical Observations
  85. GRB 120404A: MASTER OT observations
  86. GRB120404A: GROND observations show steeply decaying afterglow
  87. GRB120404A: MOA optical observations of the initial rise afterglow
  88. GRB 120404A: VLT/X-shooter redshift confirmation
  89. GRB 120404A: Swift/UVOT Detection
  90. GRB 120404A: MITSuME Ishigakijima Optical Observation
  91. GRB 120404A: MITSuME Okayama Optical Observation
  92. GRB 120403B: Swift-XRT refined Analysis
  93. GRB 120404A: Swift-XRT refined Analysis
  94. GRB 120404A: Swift-BAT refined analysis
  95. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  96. GRB 120404A: Enhanced Swift-XRT position
  97. GRB 120402B: MASTER early OT limit
  98. GRB 120403B: TAROT La Silla observatory optical observations
  99. GRB 120403B: Fermi GBM Observation
  100. GRB 120404A: Gemini-N Redshift

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