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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"

27616 results found.

  1. GRB 120521C: PAIRITEL NIR Upper Limits
  2. GRB 120521C: WHT optical observations
  3. GRB 120521C - NOT optical limits
  4. GRB120521C: Liverpool Telescope observations
  5. GRB 120521C: TAROT Calern observatory optical observations
  6. GRB 120521C: Swift detection of a burst
  7. GRB 120521B: Swift-BAT refined analysis
  8. GRB 120521B: Swift-XRT refined Analysis
  9. Swift starts a new program to find fainter transients
  10. IPN Triangulation of GRB 120519A (short/hard)
  11. GRB 120521A: Swift/UVOT Upper Limits
  12. GRB 120521A: Swift-BAT refined analysis
  13. GRB 120521B/Fermi Trigger 359284074: early MASTER-ICATE optical limit
  14. GRB120521B: Faulkes Telescope South observations
  15. GRB 120521B: TAROT La Silla observatory optical observations
  16. GRB 120521B: Swift detection of a burst
  17. GRB 120521A: TAROT La Silla observatory optical observations
  18. GRB 120521A: Swift detection of a short burst
  19. GRB 120514A : Suzaku WAM observation of the prompt emission
  20. Swift Trigger 522245 is a noise fluctuation near IGR J17091-3624
  21. GRB 120514A: GROND upper limits
  22. GRB 120514A: Swift/UVOT Upper Limits
  23. GRB 120514A: Swift-XRT refined Analysis
  24. GRB 120514A: Swift-BAT refined analysis
  25. GRB 120514A: TAROT Calern observatory optical observations
  26. GRB 120514A: Swift detection of a burst
  27. Fermi GBM Trigger 358364818 is not a GRB
  28. Fermi Trigger 358364818: BOOTES-4 observations
  29. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
  30. GRB 120510A: Swift XRT and UVOT observations
  31. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  32. GRB 120422A: CARMA 3mm observations
  33. IPN Triangulation of GRB 120427A
  34. Swift detection of 4U 1630-47
  35. IPN Triangulation of bright GRB 120426A
  36. Swift Trigger 520928 is a noise event
  37. Swift Trigger 520928 is probably not a burst
  38. GRB 120422A: JCMT SCUBA-2 sub-mm observation
  39. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  40. GRB 120422A GROND observations
  41. GRB 120422A: Super-LOTIS early observations
  42. GRB 120422A: Zadko observatory - Gingin optical observations
  43. GRB 120422A: Swift-XRT refined Analysis
  44. GRB 120422A: A Swift/UVOT Detection
  45. GRB 120422A: Swift-BAT refined analysis
  46. GRB 120422A: Gemini observations
  47. GRB 120422A: Faulkes Telescope North observations
  48. GRB 120422A: Swift detection of a burst
  49. GRB 120419A: Swift-XRT and UVOT observations
  50. Swift Trigger 519874 is a noise event
  51. SGR1806-20, Swift-BAT refined analysis (Trigger 519868)
  52. Swift Trigger 519874 is probably a noise event
  53. Trigger 519868: Swift detection of SGR1806-20
  54. GRB 120404A: optical observations
  55. GRB 120404A, Optical Observations
  56. GRB 120404A: JCMT SCUBA-2 sub-mm observation
  57. GRB 120404A: MASTER OT observations
  58. GRB120404A: GROND observations show steeply decaying afterglow
  59. GRB120404A: MOA optical observations of the initial rise afterglow
  60. GRB 120404A: VLT/X-shooter redshift confirmation
  61. GRB 120404A: Swift/UVOT Detection
  62. GRB 120403B: Swift-XRT refined Analysis
  63. GRB 120404A: Swift-XRT refined Analysis
  64. GRB 120404A: Swift-BAT refined analysis
  65. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  66. GRB 120403B: TAROT La Silla observatory optical observations
  67. GRB 120403B: Fermi GBM Observation
  68. GRB 120404A: Gemini-N Redshift
  69. GRB 120403B: AAT nIR observations
  70. GRB 120404A: MITSuME Akeno Optical upper limits
  71. GRB 120404A: Faulkes Telescope North afterglow confirmation
  72. GRB 120404A: Swift detection of a burst with an optical counterpart
  73. GRB 120403B: Swift-BAT refined analysis
  74. GRB 120403B: Swift/UVOT Upper Limits
  75. GRB 120403A: Swift/BAT spectral lag analysis
  76. GRB 120403B: Swift detection of a burst
  77. BAT trigger 519207 was a burst from Cyg X-1, was not GRB 120402A
  78. GRB 120402A: optical upper limit
  79. GRB 120320A: early optical upper limit
  80. GRB 120403A, Swift-BAT refined analysis
  81. GRB 120402B: Fermi GBM detection
  82. GRB 120326A: Bassano Bresciano Observatory - correction for GCN Cir 13178
  83. GRB 120403A: Swift detection of a burst
  84. GRB 120402A: Swift detection of a possible burst or noise
  85. GRB 120326A: Cima Rest and Bassano Brescia
  86. GRB 120401A: Swift-XRT refined Analysis
  87. GRB 120401A: Swift-BAT refined analysis
  88. GRB 120401A: Swift detection of a burst
  89. GRB 120326A: Bassano Bresciano Observatory lightcurve analisis
  90. GRB 120326A : Suzaku WAM observation of the prompt emission
  91. GRB 120326A: CARMA 3mm detection
  92. Swift trigger 518853 is most likely GX 301-2
  93. GRB 120326A: Bassano Bresciano Observatory optical observations
  94. Swift trigger 518853: MASTER-ICATE possible OT
  95. The Swift-XRT source associated with trigger 518853 is a cosmic ray
  96. Trigger 518853: Swift detection of a probable Galactic transient
  97. GRB 120328B: Fermi-LAT Observations
  98. GRB 120327A: Zadko optical observations
  99. GRB 120328B: Fermi GBM detection
  100. GRB 120328A: Swift/UVOT Upper Limits

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