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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"

27921 results found.

  1. GRB 120514A: TAROT Calern observatory optical observations
  2. GRB 120514A: Swift detection of a burst
  3. Fermi Trigger 358364818: BOOTES-4 observations
  4. GRB 120510A: Swift XRT and UVOT observations
  5. GRB 120510A: MAXI/GSC detection of a burst
  6. GRB 120422A: SN identification from GTC
  7. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  8. GRB 120422A: P200 NIR detection
  9. GRB 120422A: Gemini-N detection of a supernova
  10. GRB 120422A: i-band re-brightening and possible SN detection
  11. Swift detection of 4U 1630-47
  12. IPN Triangulation of bright GRB 120426A
  13. Swift Trigger 520928 is a noise event
  14. Swift Trigger 520928 is probably not a burst
  15. GRB 120424A: MAXI/GSC detection of a burst
  16. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  17. GRB 120422A: VLT/X-shooter spectroscopy of the GRB counterpart
  18. GRB 120422A GROND observations
  19. GRB 120422A: EVLA Detection
  20. GRB 120422A: Gemini redshift of candidate host
  21. GRB 120422A: Zadko observatory - Gingin optical observations
  22. GRB 120422A: Swift-XRT refined Analysis
  23. GRB 120422A: A Swift/UVOT Detection
  24. GRB 120422A: Enhanced Swift-XRT position
  25. GRB 120422A: Swift-BAT refined analysis
  26. GRB 120422A: Swift detection of a burst
  27. GRB 120419A: Swift-XRT and UVOT observations
  28. Swift Trigger 519874 is a noise event
  29. SGR1806-20, Swift-BAT refined analysis (Trigger 519868)
  30. Swift Trigger 519874 is probably a noise event
  31. Trigger 519868: Swift detection of SGR1806-20
  32. GRB 120404A: optical observations in Mondy observatory
  33. GRB 120404A: optical observations
  34. GRB 120404A, Optical Observations
  35. GRB 120404A: EVLA Detection
  36. GRB120404A: GROND observations show steeply decaying afterglow
  37. GRB120404A: MOA optical observations of the initial rise afterglow
  38. GRB 120404A: VLT/X-shooter redshift confirmation
  39. GRB 120404A: Swift/UVOT Detection
  40. GRB 120403B: Swift-XRT refined Analysis
  41. GRB 120404A: Swift-XRT refined Analysis
  42. GRB 120404A: Swift-BAT refined analysis
  43. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  44. GRB 120404A: Enhanced Swift-XRT position
  45. GRB 120403B: TAROT La Silla observatory optical observations
  46. GRB 120403B: Fermi GBM Observation
  47. GRB 120404A: MASTER early OT limit
  48. GRB 120404A: Faulkes Telescope North afterglow confirmation
  49. GRB 120404A: Swift detection of a burst with an optical counterpart
  50. GRB 120403B: Swift-BAT refined analysis
  51. GRB 120403B: Swift/UVOT Upper Limits
  52. GRB 120403B: Enhanced Swift-XRT position
  53. GRB 120403A: Swift/BAT spectral lag analysis
  54. GRB 120403B: Swift detection of a burst
  55. BAT trigger 519207 was a burst from Cyg X-1, was not GRB 120402A
  56. GRB 120402A: optical upper limit
  57. GRB 120320A: optical upper limit in Mondy observatory
  58. GRB 120320A: early optical upper limit
  59. GRB 120403A: MASTER follow up observations
  60. GRB 120402A: MASTER follow up observations
  61. GRB 120403A, Swift-BAT refined analysis
  62. GRB 120402B: Fermi GBM detection
  63. GRB 120328B: Pi of the Sky simultaneous upper limits
  64. GRB 120326A: Bassano Bresciano Observatory - correction for GCN Cir 13178
  65. GRB 120403A: Swift detection of a burst
  66. GRB 120402A: Swift detection of a possible burst or noise
  67. GRB 120326A: Cima Rest and Bassano Brescia
  68. GRB 120401A: Swift-XRT refined Analysis
  69. GRB 120401A: Swift-BAT refined analysis
  70. GRB 120401A: Enhanced Swift-XRT position
  71. GRB 120401A: Prompt enhanced Swift-XRT position
  72. GRB 120401A: Swift detection of a burst
  73. GRB 120326A: EVLA Observations
  74. GRB120327A - ATCA radio afterglow detection at 34GHz
  75. GRB 120324A: CrAO optical upper limit
  76. GRB 120326A: Bassano Bresciano Observatory lightcurve analisis
  77. GRB 120326A : Suzaku WAM observation of the prompt emission
  78. GRB 120326A: CARMA 3mm detection
  79. Swift trigger 518853 is most likely GX 301-2
  80. GRB 120326A: Bassano Bresciano Observatory optical observations
  81. Swift trigger 518853: MASTER-ICATE possible OT
  82. The Swift-XRT source associated with trigger 518853 is a cosmic ray
  83. Trigger 518853: Swift detection of a probable Galactic transient
  84. GRB 120327A: Zadko optical observations
  85. GRB 120328B: Fermi GBM detection
  86. long/intense GRB 120328B: MASTER follow up observations
  87. GRB 120328A: Swift/UVOT Upper Limits
  88. GRB 120328A: Swift-XRT refined Analysis
  89. IPN Triangulation of GRB 120328B (long/intense)
  90. GRB 120328A: Swift-BAT refined analysis
  91. GRB 120328A: Enhanced Swift-XRT position
  92. GRB 120328A: TAROT La Silla observatory optical observations
  93. Skynet/PROMPT observations of GRB120328A
  94. GRB 120328A: Swift detection of a burst
  95. GRB 120327A: GTC redshift confirmation
  96. GRB 120326A: Fermi GBM Observation
  97. GRB 120327A afterglow detection
  98. GRB 120326A: PAIRITEL NIR Observations
  99. GRB 120326A: Bassano Bresciano Observatory optical observations
  100. GRB 120327A: Swift-XRT refined Analysis

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