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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"

19662 results found.

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

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