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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"

28295 results found.

  1. GRB 120514A: GROND upper limits
  2. GRB 120514A: Swift/UVOT Upper Limits
  3. GRB 120514A: UKIRT IR observations
  4. Konus-Wind observation of GRB 120510A
  5. GRB 120514A: Swift-XRT refined Analysis
  6. GRB 120514A: APEX observations of the submm counterpart
  7. GRB 120514A: Enhanced Swift-XRT position
  8. GRB 120514A: Swift-BAT refined analysis
  9. GRB 120514A: TAROT Calern observatory optical observations
  10. GRB 120514A: Swift detection of a burst
  11. GRB 120422A: Konkoly optical observations
  12. Fermi Trigger 358364818: BOOTES-4 observations
  13. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
  14. GRB 120510A: Swift XRT and UVOT observations
  15. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  16. GRB 120422A: P200 NIR detection
  17. GRB 120422A: Gemini-N detection of a supernova
  18. GRB 120422A: optical observations
  19. Konus-Wind observation of GRB 120427A
  20. Swift detection of 4U 1630-47
  21. GRB 120422A, the review of the sky area in plate archives
  22. Konus-Wind observation of GRB 120426A
  23. GRB 120422A: Additional Gemini observations and Keck/LRIS spectroscopy
  24. IPN Triangulation of bright GRB 120426A
  25. GRB 120422A: MITSuME Ishigakijima upper limit
  26. Swift Trigger 520928 is probably not a burst
  27. GRB 120422A: 272 GHz observations from SMA
  28. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  29. GRB 120422A GROND observations
  30. GRB 120422A: Super-LOTIS early observations
  31. GRB 120422A: NOT optical observations
  32. GRB 120422A: Zadko observatory - Gingin optical observations
  33. GRB 120422A: Swift-XRT refined Analysis
  34. GRB 120422A: A Swift/UVOT Detection
  35. GRB 120422A: Enhanced Swift-XRT position
  36. GRB 120422A: Swift-BAT refined analysis
  37. GRB 120422A: Gemini observations
  38. GRB 120422A: Faulkes Telescope North observations
  39. GRB 120422A: Swift detection of a burst
  40. GRB 120419A: Swift-XRT and UVOT observations
  41. GRB 120419A: A long GRB detected by INTEGRAL
  42. SGR1806-20, Swift-BAT refined analysis (Trigger 519868)
  43. Swift Trigger 519874 is probably a noise event
  44. Trigger 519868: Swift detection of SGR1806-20
  45. GRB 120404A: optical observations in Mondy observatory
  46. GRB 120404A: optical observations
  47. GRB 120404A, Optical Observations
  48. GRB 120404A: MASTER OT observations
  49. GRB120404A: GROND observations show steeply decaying afterglow
  50. GRB120404A: MOA optical observations of the initial rise afterglow
  51. GRB 120404A: VLT/X-shooter redshift confirmation
  52. GRB 120404A: Swift/UVOT Detection
  53. GRB 120404A: MITSuME Ishigakijima Optical Observation
  54. GRB 120404A: MITSuME Okayama Optical Observation
  55. GRB 120403B: Swift-XRT refined Analysis
  56. GRB 120404A: Swift-XRT refined Analysis
  57. GRB 120404A: Swift-BAT refined analysis
  58. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  59. GRB 120404A: Enhanced Swift-XRT position
  60. GRB 120402B: MASTER early OT limit
  61. GRB 120403B: TAROT La Silla observatory optical observations
  62. GRB 120403B: Fermi GBM Observation
  63. GRB 120404A: Gemini-N Redshift
  64. GRB 120403B: AAT nIR observations
  65. GRB 120404A: Faulkes Telescope North afterglow confirmation
  66. GRB 120404A: Swift detection of a burst with an optical counterpart
  67. GRB 120403B: Swift-BAT refined analysis
  68. GRB 120403B: Swift/UVOT Upper Limits
  69. GRB 120403B: Enhanced Swift-XRT position
  70. GRB 120403A: Swift/BAT spectral lag analysis
  71. GRB 120403B: Swift detection of a burst
  72. BAT trigger 519207 was a burst from Cyg X-1, was not GRB 120402A
  73. GRB 120326A, the review of the sky area in plate archives
  74. GRB 120402A: optical upper limit
  75. GRB 120320A: optical upper limit in Mondy observatory
  76. GRB 120320A: early optical upper limit
  77. GRB 120403A, Swift-BAT refined analysis
  78. GRB 120402B: Fermi GBM detection
  79. GRB 120328B: Pi of the Sky simultaneous upper limits
  80. GRB 120326A: Bassano Bresciano Observatory - correction for GCN Cir 13178
  81. GRB 120402A: Swift detection of a possible burst or noise
  82. GRB 120326A: Cima Rest and Bassano Brescia
  83. GRB 120327A: SMARTS optical/IR afterglow observations
  84. GRB 120401A: Swift-XRT refined Analysis
  85. GRB 120401A: Swift-BAT refined analysis
  86. GRB 120401A: Enhanced Swift-XRT position
  87. GRB 120401A: Swift detection of a burst
  88. GRB 120324A: CrAO optical upper limit
  89. GRB 120326A: Bassano Bresciano Observatory lightcurve analisis
  90. GRB 120326A: MITSuME Ishigakijima Optical Observation at 3 days afterthe burst
  91. GRB 120326A : Suzaku WAM observation of the prompt emission
  92. GRB 120324A, the review of the sky area in plate archives
  93. GRB 120326A: Bassano Bresciano Observatory optical observations
  94. GRB 120328A: MITSuME Ishigakijima Optical Upper Limits
  95. GRB 120326A: MITSuME Ishigakijima Optical Observation at 2 days afterthe burst
  96. GRB 120327A: MITSuME Ishigakijima Optical Upper Limits at 1 day afterthe burst
  97. Swift trigger 518853: MASTER-ICATE possible OT
  98. The Swift-XRT source associated with trigger 518853 is a cosmic ray
  99. Trigger 518853: Swift detection of a probable Galactic transient
  100. GRB 120328B: Fermi-LAT Observations

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