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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"

28270 results found.

  1. Swift Trigger 520928 is probably not a burst
  2. GRB 120422A: 272 GHz observations from SMA
  3. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  4. GRB 120422A GROND observations
  5. GRB 120422A: Super-LOTIS early observations
  6. GRB 120422A: NOT optical observations
  7. GRB 120422A: Zadko observatory - Gingin optical observations
  8. GRB 120422A: Swift-XRT refined Analysis
  9. GRB 120422A: A Swift/UVOT Detection
  10. GRB 120422A: Enhanced Swift-XRT position
  11. GRB 120422A: Swift-BAT refined analysis
  12. GRB 120422A: Gemini observations
  13. GRB 120422A: Faulkes Telescope North observations
  14. GRB 120422A: Swift detection of a burst
  15. GRB 120419A: Swift-XRT and UVOT observations
  16. GRB 120419A: A long GRB detected by INTEGRAL
  17. SGR1806-20, Swift-BAT refined analysis (Trigger 519868)
  18. Swift Trigger 519874 is probably a noise event
  19. Trigger 519868: Swift detection of SGR1806-20
  20. GRB 120404A: optical observations in Mondy observatory
  21. GRB 120404A: optical observations
  22. GRB 120404A, Optical Observations
  23. GRB 120404A: MASTER OT observations
  24. GRB120404A: GROND observations show steeply decaying afterglow
  25. GRB120404A: MOA optical observations of the initial rise afterglow
  26. GRB 120404A: VLT/X-shooter redshift confirmation
  27. GRB 120404A: Swift/UVOT Detection
  28. GRB 120404A: MITSuME Ishigakijima Optical Observation
  29. GRB 120404A: MITSuME Okayama Optical Observation
  30. GRB 120403B: Swift-XRT refined Analysis
  31. GRB 120404A: Swift-XRT refined Analysis
  32. GRB 120404A: Swift-BAT refined analysis
  33. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  34. GRB 120404A: Enhanced Swift-XRT position
  35. GRB 120402B: MASTER early OT limit
  36. GRB 120403B: TAROT La Silla observatory optical observations
  37. GRB 120403B: Fermi GBM Observation
  38. GRB 120404A: Gemini-N Redshift
  39. GRB 120403B: AAT nIR observations
  40. GRB 120404A: Faulkes Telescope North afterglow confirmation
  41. GRB 120404A: Swift detection of a burst with an optical counterpart
  42. GRB 120403B: Swift-BAT refined analysis
  43. GRB 120403B: Swift/UVOT Upper Limits
  44. GRB 120403B: Enhanced Swift-XRT position
  45. GRB 120403A: Swift/BAT spectral lag analysis
  46. GRB 120403B: Swift detection of a burst
  47. BAT trigger 519207 was a burst from Cyg X-1, was not GRB 120402A
  48. GRB 120326A, the review of the sky area in plate archives
  49. GRB 120402A: optical upper limit
  50. GRB 120320A: optical upper limit in Mondy observatory
  51. GRB 120320A: early optical upper limit
  52. GRB 120403A, Swift-BAT refined analysis
  53. GRB 120402B: Fermi GBM detection
  54. GRB 120328B: Pi of the Sky simultaneous upper limits
  55. GRB 120326A: Bassano Bresciano Observatory - correction for GCN Cir 13178
  56. GRB 120402A: Swift detection of a possible burst or noise
  57. GRB 120326A: Cima Rest and Bassano Brescia
  58. GRB 120327A: SMARTS optical/IR afterglow observations
  59. GRB 120401A: Swift-XRT refined Analysis
  60. GRB 120401A: Swift-BAT refined analysis
  61. GRB 120401A: Enhanced Swift-XRT position
  62. GRB 120401A: Swift detection of a burst
  63. GRB 120324A: CrAO optical upper limit
  64. GRB 120326A: Bassano Bresciano Observatory lightcurve analisis
  65. GRB 120326A: MITSuME Ishigakijima Optical Observation at 3 days afterthe burst
  66. GRB 120326A : Suzaku WAM observation of the prompt emission
  67. GRB 120324A, the review of the sky area in plate archives
  68. GRB 120326A: Bassano Bresciano Observatory optical observations
  69. GRB 120328A: MITSuME Ishigakijima Optical Upper Limits
  70. GRB 120326A: MITSuME Ishigakijima Optical Observation at 2 days afterthe burst
  71. GRB 120327A: MITSuME Ishigakijima Optical Upper Limits at 1 day afterthe burst
  72. Swift trigger 518853: MASTER-ICATE possible OT
  73. The Swift-XRT source associated with trigger 518853 is a cosmic ray
  74. Trigger 518853: Swift detection of a probable Galactic transient
  75. GRB 120328B: Fermi-LAT Observations
  76. GRB 120327A: Zadko optical observations
  77. GRB 120328B: Fermi GBM detection
  78. GRB 120328A: Swift/UVOT Upper Limits
  79. GRB 120328A: Swift-XRT refined Analysis
  80. IPN Triangulation of GRB 120328B (long/intense)
  81. GRB 120327A: MITSuME Ishigakijima Optical Observation
  82. GRB 120326A: MITSuME Ishigakijima Optical Observation
  83. GRB 120328A: Swift-BAT refined analysis
  84. GRB 120328A: Enhanced Swift-XRT position
  85. GRB 120327A: NOT optical observations
  86. GRB 120328A: TAROT La Silla observatory optical observations
  87. Skynet/PROMPT observations of GRB120328A
  88. GRB 120328A: Swift detection of a burst
  89. GRB 120326A: Fermi GBM Observation
  90. GRB 120327A afterglow detection
  91. GRB 120326A: PAIRITEL NIR Observations
  92. GRB 120326A: Bassano Bresciano Observatory optical observations
  93. GRB 120327A: Swift-XRT refined Analysis
  94. GRB 120326A: LOAO R-band Observations
  95. GRB 120327A: Swift/UVOT further analysis
  96. GRB 120327A: Swift-BAT refined analysis
  97. GRB 120326A : SMA submm observation
  98. GRB 120327A: Enhanced Swift-XRT position
  99. GRB 120327A: X-shooter redshift
  100. GROND observations of GRB 120327A

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