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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"

19670 results found.

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

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