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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"

19710 results found.

  1. GRB 120521B: Swift/UVOT Upper Limits
  2. GRB 120521B: GROND Upper limits
  3. GRB 120521C: PAIRITEL NIR Upper Limits
  4. GRB 120521C: Enhanced Swift-XRT position
  5. GRB 120521C - NOT optical limits
  6. GRB 120521C: TAROT Calern observatory optical observations
  7. GRB 120521C: Swift detection of a burst
  8. IPN Triangulation of GRB 120519A (short/hard)
  9. GRB 120521A: Swift/UVOT Upper Limits
  10. GRB 120521B: Enhanced Swift-XRT position
  11. GRB 120521A: Swift-BAT refined analysis
  12. GRB 120521B: TAROT La Silla observatory optical observations
  13. GRB 120521B: Swift detection of a burst
  14. GRB 120521A: Enhanced Swift-XRT position
  15. GRB 120521A: TAROT La Silla observatory optical observations
  16. GRB 120521A: Swift detection of a short burst
  17. Swift Trigger 522245 is a noise fluctuation near IGR J17091-3624
  18. GRB 120514A: GROND upper limits
  19. GRB 120514A: Swift/UVOT Upper Limits
  20. GRB 120514A: UKIRT IR observations
  21. GRB 120514A: APEX observations of the submm counterpart
  22. GRB 120514A: Enhanced Swift-XRT position
  23. GRB 120514A: TAROT Calern observatory optical observations
  24. GRB 120514A: Swift detection of a burst
  25. GRB 120422A: Konkoly optical observations
  26. Fermi Trigger 358364818: BOOTES-4 observations
  27. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
  28. GRB 120510A: Swift XRT and UVOT observations
  29. GRB 120422A: P200 NIR detection
  30. GRB 120422A: optical observations
  31. Swift detection of 4U 1630-47
  32. Konus-Wind observation of GRB 120426A
  33. IPN Triangulation of bright GRB 120426A
  34. GRB 120422A: MITSuME Ishigakijima upper limit
  35. Swift Trigger 520928 is probably not a burst
  36. GRB 120422A: 272 GHz observations from SMA
  37. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  38. GRB 120422A GROND observations
  39. GRB 120422A: Super-LOTIS early observations
  40. GRB 120422A: NOT optical observations
  41. GRB 120422A: Zadko observatory - Gingin optical observations
  42. GRB 120422A: A Swift/UVOT Detection
  43. GRB 120422A: Enhanced Swift-XRT position
  44. GRB 120422A: Gemini observations
  45. GRB 120422A: Faulkes Telescope North observations
  46. GRB 120422A: Swift detection of a burst
  47. GRB 120419A: Swift-XRT and UVOT observations
  48. Swift Trigger 519874 is probably a noise event
  49. Trigger 519868: Swift detection of SGR1806-20
  50. GRB 120404A: optical observations in Mondy observatory
  51. GRB 120404A: optical observations
  52. GRB 120404A, Optical Observations
  53. GRB120404A: GROND observations show steeply decaying afterglow
  54. GRB 120404A: Swift/UVOT Detection
  55. GRB 120404A: MITSuME Ishigakijima Optical Observation
  56. GRB 120404A: MITSuME Okayama Optical Observation
  57. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  58. GRB 120404A: Enhanced Swift-XRT position
  59. GRB 120402B: MASTER early OT limit
  60. GRB 120403B: TAROT La Silla observatory optical observations
  61. GRB 120404A: Gemini-N Redshift
  62. GRB 120403B: AAT nIR observations
  63. GRB 120404A: Faulkes Telescope North afterglow confirmation
  64. GRB 120404A: Swift detection of a burst with an optical counterpart
  65. GRB 120403B: Swift/UVOT Upper Limits
  66. GRB 120403B: Enhanced Swift-XRT position
  67. GRB 120403B: Swift detection of a burst
  68. GRB 120402A: optical upper limit
  69. GRB 120320A: optical upper limit in Mondy observatory
  70. GRB 120320A: early optical upper limit
  71. GRB 120328B: Pi of the Sky simultaneous upper limits
  72. GRB 120326A: Bassano Bresciano Observatory - correction for GCN Cir 13178
  73. GRB 120402A: Swift detection of a possible burst or noise
  74. GRB 120326A: Cima Rest and Bassano Brescia
  75. GRB 120327A: SMARTS optical/IR afterglow observations
  76. GRB 120401A: Enhanced Swift-XRT position
  77. GRB 120401A: Swift detection of a burst
  78. GRB 120324A: CrAO optical upper limit
  79. GRB 120326A: Bassano Bresciano Observatory lightcurve analisis
  80. GRB 120326A: MITSuME Ishigakijima Optical Observation at 3 days afterthe burst
  81. GRB 120326A: Bassano Bresciano Observatory optical observations
  82. GRB 120328A: MITSuME Ishigakijima Optical Upper Limits
  83. GRB 120326A: MITSuME Ishigakijima Optical Observation at 2 days afterthe burst
  84. GRB 120327A: MITSuME Ishigakijima Optical Upper Limits at 1 day afterthe burst
  85. Swift trigger 518853: MASTER-ICATE possible OT
  86. Trigger 518853: Swift detection of a probable Galactic transient
  87. GRB 120328B: Fermi-LAT Observations
  88. GRB 120327A: Zadko optical observations
  89. GRB 120328A: Swift/UVOT Upper Limits
  90. Konus-Wind observation of GRB 120328B
  91. IPN Triangulation of GRB 120328B (long/intense)
  92. GRB 120327A: MITSuME Ishigakijima Optical Observation
  93. GRB 120326A: MITSuME Ishigakijima Optical Observation
  94. GRB 120328A: Swift-BAT refined analysis
  95. GRB 120328A: Enhanced Swift-XRT position
  96. GRB 120328A: TAROT La Silla observatory optical observations
  97. Skynet/PROMPT observations of GRB120328A
  98. GRB 120328A: Swift detection of a burst
  99. GRB 120327A afterglow detection
  100. GRB 120326A: PAIRITEL NIR Observations

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