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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"

26675 results found.

  1. GRB 120514A: TAROT Calern observatory optical observations
  2. GRB 120514A: Swift detection of a burst
  3. GRB 120422A: Konkoly optical observations
  4. Fermi GBM Trigger 358364818 is not a GRB
  5. Fermi Trigger 358364818: BOOTES-4 observations
  6. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
  7. GRB 120510A: Swift XRT and UVOT observations
  8. GRB 120510A: MAXI/GSC detection of a burst
  9. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  10. GRB 120422A: P200 NIR detection
  11. GRB 120422A: optical observations
  12. Swift detection of 4U 1630-47
  13. IPN Triangulation of bright GRB 120426A
  14. GRB 120422A: MITSuME Ishigakijima upper limit
  15. Swift Trigger 520928 is probably not a burst
  16. GRB 120422A: 272 GHz observations from SMA
  17. GRB 120422A: JCMT SCUBA-2 sub-mm observation
  18. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  19. GRB 120422A GROND observations
  20. GRB 120422A: Super-LOTIS early observations
  21. GRB 120422A: NOT optical observations
  22. GRB 120422A: Zadko observatory - Gingin optical observations
  23. GRB 120422A: Swift-XRT refined Analysis
  24. GRB 120422A: A Swift/UVOT Detection
  25. GRB 120422A: Enhanced Swift-XRT position
  26. GRB 120422A: Gemini observations
  27. GRB 120422A: Faulkes Telescope North observations
  28. GRB 120422A: Swift detection of a burst
  29. GRB 120419A: Swift-XRT and UVOT observations
  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: JCMT SCUBA-2 sub-mm observation
  36. GRB120404A: GROND observations show steeply decaying afterglow
  37. GRB120404A: MOA optical observations of the initial rise afterglow
  38. GRB 120404A: Swift/UVOT Detection
  39. GRB 120404A: MITSuME Ishigakijima Optical Observation
  40. GRB 120404A: MITSuME Okayama Optical Observation
  41. GRB 120403B: Swift-XRT refined Analysis
  42. GRB 120404A: Swift-XRT refined Analysis
  43. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  44. GRB 120404A: Enhanced Swift-XRT position
  45. GRB 120402B: MASTER early OT limit
  46. GRB 120403B: TAROT La Silla observatory optical observations
  47. GRB 120403B: Fermi GBM Observation
  48. GRB 120404A: Gemini-N Redshift
  49. GRB 120403B: AAT nIR observations
  50. GRB 120404A: Faulkes Telescope North afterglow confirmation
  51. GRB 120404A: Swift detection of a burst with an optical counterpart
  52. GRB 120403B: Swift/UVOT Upper Limits
  53. GRB 120403B: Enhanced Swift-XRT position
  54. GRB 120403B: Swift detection of a burst
  55. GRB 120402A: optical upper limit
  56. GRB 120320A: optical upper limit in Mondy observatory
  57. GRB 120320A: early optical upper limit
  58. GRB 120402B: Fermi GBM detection
  59. GRB 120328B: Pi of the Sky simultaneous upper limits
  60. GRB 120326A: Bassano Bresciano Observatory - correction for GCN Cir 13178
  61. GRB 120403A: Swift detection of a burst
  62. GRB 120402A: Swift detection of a possible burst or noise
  63. GRB 120326A: Cima Rest and Bassano Brescia
  64. GRB 120327A: SMARTS optical/IR afterglow observations
  65. GRB 120401A: Swift-XRT refined Analysis
  66. GRB 120401A: Enhanced Swift-XRT position
  67. GRB 120401A: Swift detection of a burst
  68. GRB 120324A: CrAO optical upper limit
  69. GRB 120326A: Bassano Bresciano Observatory lightcurve analisis
  70. GRB 120326A: MITSuME Ishigakijima Optical Observation at 3 days afterthe burst
  71. GRB 120326A : Suzaku WAM observation of the prompt emission
  72. Swift trigger 518853 is most likely GX 301-2
  73. GRB 120326A: Bassano Bresciano Observatory optical observations
  74. GRB 120328A: MITSuME Ishigakijima Optical Upper Limits
  75. GRB 120326A: MITSuME Ishigakijima Optical Observation at 2 days afterthe burst
  76. GRB 120327A: MITSuME Ishigakijima Optical Upper Limits at 1 day afterthe burst
  77. Swift trigger 518853: MASTER-ICATE possible OT
  78. The Swift-XRT source associated with trigger 518853 is a cosmic ray
  79. Trigger 518853: Swift detection of a probable Galactic transient
  80. GRB 120328B: Fermi-LAT Observations
  81. GRB 120327A: Zadko optical observations
  82. GRB 120328B: Fermi GBM detection
  83. long/intense GRB 120328B: MASTER follow up observations
  84. GRB 120328A: Swift/UVOT Upper Limits
  85. GRB 120328A: Swift-XRT refined Analysis
  86. IPN Triangulation of GRB 120328B (long/intense)
  87. GRB 120327A: MITSuME Ishigakijima Optical Observation
  88. GRB 120326A: MITSuME Ishigakijima Optical Observation
  89. GRB 120328A: Enhanced Swift-XRT position
  90. GRB 120328A: TAROT La Silla observatory optical observations
  91. Skynet/PROMPT observations of GRB120328A
  92. GRB 120328A: Swift detection of a burst
  93. GRB 120326A: Fermi GBM Observation
  94. GRB 120327A afterglow detection
  95. GRB 120326A: PAIRITEL NIR Observations
  96. GRB 120326A: Bassano Bresciano Observatory optical observations
  97. GRB 120327A: Swift-XRT refined Analysis
  98. GRB 120327A: Swift/UVOT further analysis
  99. GRB 120327A: Swift-BAT refined analysis
  100. GRB 120326A : SMA submm observation

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