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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"

19666 results found.

  1. GRB 120404A: Swift-BAT refined analysis
  2. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  3. GRB 120404A: Enhanced Swift-XRT position
  4. GRB 120403B: TAROT La Silla observatory optical observations
  5. GRB 120403B: Fermi GBM Observation
  6. GRB 120404A: MASTER early OT limit
  7. GRB 120404A: Faulkes Telescope North afterglow confirmation
  8. GRB 120404A: Swift detection of a burst with an optical counterpart
  9. GRB 120403B: Swift-BAT refined analysis
  10. GRB 120403B: Swift/UVOT Upper Limits
  11. GRB 120403B: Enhanced Swift-XRT position
  12. GRB 120403A: Swift/BAT spectral lag analysis
  13. GRB 120403B: Swift detection of a burst
  14. BAT trigger 519207 was a burst from Cyg X-1, was not GRB 120402A
  15. GRB 120402A: optical upper limit
  16. GRB 120320A: optical upper limit in Mondy observatory
  17. GRB 120320A: early optical upper limit
  18. GRB 120403A: MASTER follow up observations
  19. GRB 120402A: MASTER follow up observations
  20. GRB 120403A, Swift-BAT refined analysis
  21. GRB 120326A: Bassano Bresciano Observatory - correction for GCN Cir 13178
  22. GRB 120403A: Swift detection of a burst
  23. GRB 120402A: Swift detection of a possible burst or noise
  24. GRB 120326A: Cima Rest and Bassano Brescia
  25. GRB 120401A: Swift-XRT refined Analysis
  26. GRB 120401A: Swift-BAT refined analysis
  27. GRB 120401A: Enhanced Swift-XRT position
  28. GRB 120401A: Prompt enhanced Swift-XRT position
  29. GRB 120401A: Swift detection of a burst
  30. GRB 120326A: EVLA Observations
  31. GRB 120324A: CrAO optical upper limit
  32. GRB 120326A: Bassano Bresciano Observatory lightcurve analisis
  33. GRB 120326A : Suzaku WAM observation of the prompt emission
  34. Swift trigger 518853 is most likely GX 301-2
  35. GRB 120326A: Bassano Bresciano Observatory optical observations
  36. Swift trigger 518853: MASTER-ICATE possible OT
  37. The Swift-XRT source associated with trigger 518853 is a cosmic ray
  38. Trigger 518853: Swift detection of a probable Galactic transient
  39. GRB 120327A: Zadko optical observations
  40. GRB 120328A: Swift/UVOT Upper Limits
  41. GRB 120328A: Swift-XRT refined Analysis
  42. IPN Triangulation of GRB 120328B (long/intense)
  43. GRB 120328A: Swift-BAT refined analysis
  44. GRB 120328A: Enhanced Swift-XRT position
  45. GRB 120328A: TAROT La Silla observatory optical observations
  46. Skynet/PROMPT observations of GRB120328A
  47. GRB 120328A: Swift detection of a burst
  48. GRB 120326A: Fermi GBM Observation
  49. GRB 120327A afterglow detection
  50. GRB 120326A: PAIRITEL NIR Observations
  51. GRB 120326A: Bassano Bresciano Observatory optical observations
  52. GRB 120327A: Swift-XRT refined Analysis
  53. GRB 120327A: Swift/UVOT further analysis
  54. GRB 120327A: Swift-BAT refined analysis
  55. GRB 120327A: Enhanced Swift-XRT position
  56. GRB 120327A: X-shooter redshift
  57. GROND observations of GRB 120327A
  58. GRB 120327A: Liverpool Telescope Observations
  59. GRB 120327A: TAROT La Silla observatory optical detection
  60. GRB 120327A: Swift detection of a burst with an optical counterpart
  61. GRB 120326A: Swift-BAT refined analysis
  62. GRB 120326A: Swift-XRT refined Analysis
  63. GRB 120326A: Swift/UVOT Detection
  64. GRB 120326A: Optical observations at Crni Vrh
  65. GRB120326A: IAC80 observations
  66. GRB 120326A: Liverpool Telescope observations
  67. GRB 120326A: Enhanced Swift-XRT position
  68. Skynet/Dolomiti Observations of GRB120326A
  69. GRB 120326A: TAROT Calern observatory afterglow optical detection
  70. GRB 120326A: ROTSE-III Optical Limits
  71. GRB 120326A: Swift detection of a burst
  72. IPN Triangulation of GRB 120323A (short/very intense)
  73. GRB 120324A: Swift-XRT refined Analysis
  74. Konus-Wind observation of GRB 120324A
  75. GRB 120324A: GROND observations
  76. GRB 120324A: Swift-BAT refined analysis
  77. GRB 120324A: Swift/UVOT Upper Limits
  78. GRB 120324A: TAROT La Silla observatory optical observations
  79. GRB 120324A: Enhanced Swift-XRT position
  80. GRB 120324A: Liverpool Telescope optical candidate
  81. GRB 120324A: UVOT Finding Chart Observation
  82. GRB 120324A: Swift detection of a burst
  83. Simultaneous optical images of Swift pointing are available by GRT
  84. GRB 120320A: Zadko optical observations
  85. GRB 120320A: Swift/UVOT Upper Limits
  86. GRB 120320A: BOOTES-4 optical upper limit
  87. GRB 120320A: Swift-XRT refined Analysis
  88. GRB 120320A, Swift-BAT refined analysis
  89. GRB 120320A: Enhanced Swift-XRT position
  90. IPN Triangulation of GRB 120316A
  91. GRB 120320A: MASTER optical observations
  92. GRB 120320A: Swift detection of a burst
  93. Trigger 517876 is a Swift detection of GX 5-1
  94. GRB 120302A: Swift XRT refined analysis
  95. GRB 120312A: CrAO optical upper limit
  96. GRB 120311A: Optical follow-up
  97. GRB 120311A: C88 optical limits
  98. GRB 120312A: Swift/UVOT Upper Limits
  99. GRB 120312A: MASTER-NET optical observations
  100. GRB 120312A: NOT observations

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