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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"

28236 results found.

  1. GRB 120422A: Swift-XRT refined Analysis
  2. GRB 120422A: A Swift/UVOT Detection
  3. GRB 120422A: Enhanced Swift-XRT position
  4. GRB 120422A: Gemini observations
  5. GRB 120422A: Faulkes Telescope North observations
  6. GRB 120422A: Swift detection of a burst
  7. GRB 120419A: Swift-XRT and UVOT observations
  8. Swift Trigger 519874 is probably a noise event
  9. Trigger 519868: Swift detection of SGR1806-20
  10. GRB 120404A: optical observations in Mondy observatory
  11. GRB 120404A: optical observations
  12. GRB 120404A, Optical Observations
  13. GRB 120404A: SMARTS optical/IR observations
  14. GRB 120404A: EVLA Detection
  15. GRB120404A: GROND observations show steeply decaying afterglow
  16. GRB120404A: MOA optical observations of the initial rise afterglow
  17. GRB 120404A: VLT/X-shooter redshift confirmation
  18. GRB 120404A: Swift/UVOT Detection
  19. GRB 120404A: MITSuME Ishigakijima Optical Observation
  20. GRB 120404A: MITSuME Okayama Optical Observation
  21. GRB 120403B: Swift-XRT refined Analysis
  22. GRB 120404A: Swift-XRT refined Analysis
  23. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  24. GRB 120404A: Enhanced Swift-XRT position
  25. GRB 120403B: TAROT La Silla observatory optical observations
  26. GRB 120404A: Gemini-N Redshift
  27. GRB 120403B: AAT nIR observations
  28. GRB 120404A: MITSuME Akeno Optical upper limits
  29. GRB 120404A: Faulkes Telescope North afterglow confirmation
  30. GRB 120404A: Swift detection of a burst with an optical counterpart
  31. GRB 120403B: Swift/UVOT Upper Limits
  32. GRB 120403B: Enhanced Swift-XRT position
  33. GRB 120403B: Swift detection of a burst
  34. GRB 120320A: optical upper limit in Mondy observatory
  35. GRB 120320A: early optical upper limit
  36. GRB 120402B: Fermi GBM detection
  37. GRB 120328B: Pi of the Sky simultaneous upper limits
  38. GRB 120403A: Swift detection of a burst
  39. GRB 120402A: Swift detection of a possible burst or noise
  40. GRB 120327A: SMARTS optical/IR afterglow observations
  41. GRB 120401A: Swift-XRT refined Analysis
  42. GRB 120326A: HCT optical observations
  43. GRB 120401A: Enhanced Swift-XRT position
  44. GRB 120401A: Prompt enhanced Swift-XRT position
  45. GRB 120401A: Swift detection of a burst
  46. GRB 120326A: EVLA Observations
  47. GRB120327A - ATCA radio afterglow detection at 34GHz
  48. GRB 120324A: CrAO optical upper limit
  49. GRB 120326A: MITSuME Ishigakijima Optical Observation at 3 days afterthe burst
  50. GRB 120326A: CARMA 3mm detection
  51. GRB 120328A: MITSuME Ishigakijima Optical Upper Limits
  52. GRB 120326A: MITSuME Ishigakijima Optical Observation at 2 days afterthe burst
  53. GRB 120327A: MITSuME Ishigakijima Optical Upper Limits at 1 day afterthe burst
  54. Swift trigger 518853: MASTER-ICATE possible OT
  55. The Swift-XRT source associated with trigger 518853 is a cosmic ray
  56. Trigger 518853: Swift detection of a probable Galactic transient
  57. GRB 120328B: Fermi GBM detection
  58. long/intense GRB 120328B: MASTER follow up observations
  59. GRB 120328A: Swift/UVOT Upper Limits
  60. GRB 120326A: Bassano Bresciano Observatory further optical observations
  61. GRB 120328A: Swift-XRT refined Analysis
  62. GRB 120327A: MITSuME Ishigakijima Optical Observation
  63. GRB 120326A: MITSuME Ishigakijima Optical Observation
  64. GRB 120328A: Enhanced Swift-XRT position
  65. GRB 120327A: NOT optical observations
  66. GRB 120328A: Swift detection of a burst
  67. GRB 120327A: GTC redshift confirmation
  68. GRB 120327A afterglow detection
  69. GRB 120326A: PAIRITEL NIR Observations
  70. GRB 120327A: Swift-XRT refined Analysis
  71. GRB 120327A: CQUEAN grizY Observation
  72. GRB 120326A: LOAO R-band Observations
  73. GRB 120327A: Swift/UVOT further analysis
  74. GRB 120326A : SMA submm observation
  75. GRB 120327A: Enhanced Swift-XRT position
  76. GRB 120327A: X-shooter redshift
  77. GRB 120327A: Gemini-South redshift
  78. GROND observations of GRB 120327A
  79. Skynet/PROMPT observations of GRB120327A
  80. GRB 120326A: Maisoncelles Observatory optical observations
  81. GRB 120327A: Liverpool Telescope Observations
  82. GRB 120327A: TAROT La Silla observatory optical detection
  83. GRB 120327A: Swift detection of a burst with an optical counterpart
  84. GRB 120326A: optical observation of GMG
  85. GRB 120326A : LOT optical observation
  86. GRB 120326A: T17 optical observations
  87. GRB 120326A: GTC redshift
  88. GRB 120326A: CQUEAN grizY Observation
  89. GRB 120326A: Swift-XRT refined Analysis
  90. GRB 120326A: Swift/UVOT Detection
  91. GRB 120326A: Optical observations at Crni Vrh
  92. GRB120326A: IAC80 observations
  93. GRB 120326A: Liverpool Telescope observations
  94. GRB 120326A: Enhanced Swift-XRT position
  95. Skynet/Dolomiti Observations of GRB120326A
  96. GRB 120326A: TAROT Calern observatory afterglow optical decay
  97. GRB 120326A: TAROT Calern observatory afterglow optical detection
  98. GRB 120326A: ROTSE-III Optical Limits
  99. GRB 120326A: Swift detection of a burst
  100. Konus-Wind observation of GRB 120323A

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