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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

21770 results found.

  1. GRB 120821A: GROND upper limits
  2. GRB 120817B - PTF Observations
  3. GRB 120817A: RAPTOR Limits During Gamma-Ray Emitting Interval
  4. GRB 120811C: optical observations
  5. GRB 120817B: BAT location in ground analysis and refined analysis
  6. GRB 120819A: Bassano Bresciano Observatory optical observations
  7. GRB 120819A: GROND afterglow confirmation
  8. GRB 120819A: MITSuME Ishigakijima upper limits
  9. GRB 120819A: MITSuME Okayama Optical upper limits
  10. GRB 120819A: Enhanced Swift-XRT position
  11. GRB 120819A: afterglow candidate from NOT
  12. GRB 120819A: MASTER optical observations
  13. GRB 120819A: Swift detection of a burst
  14. GRB 120811C: optical observations
  15. GRB 120816A: Swift/UVOT Detection of the Optical Afterglow
  16. GRB 120815A: MASTER-ICATE observations
  17. Konus-Wind observation of GRB 120816B
  18. IPN Triangulation of GRB 120816B (short/exceptionally intense)
  19. GRB 120817B: LCO Optical Observations
  20. GRB 120816A: optical upper limit
  21. GRB 120817A: Enhanced Swift-XRT position
  22. GRB 120815A: Swift/UVOT Detection of the Optical Afterglow
  23. GRB 120816A: Bassano Bresciano Observatory optical observations
  24. GRB 120817A: Swift-XRT observations
  25. GRB 120816A: Enhanced Swift-XRT position
  26. GRB 120816A: BOOTES-2 observations
  27. GRB120816A: OPTIMA discovery of optical counterpart
  28. GRB 120816A: TAROT Calern observatory optical observations
  29. GRB 120816A: ROTSE-III Optical Limits
  30. GRB 120816A: Swift detection of a burst
  31. GRB 120815A: Enhanced Swift-XRT position
  32. GRB 120815A: VLT/X-shooter redshift
  33. GRB 120815A: GROND afterglow candidate
  34. GRB 120815A: Swift-XRT observations
  35. GRB 120815A: TAROT La Silla observatory optical observations
  36. GRB 120804A: Possible temporal break in the X-ray light-curve
  37. GRB 120811A: Swift/XRT-UVOT Obseravations
  38. GRB120804A: Chandra observations and afterglow detection
  39. GRB 120805A: optical afterglow confirmation from the NOT
  40. GRB 120805A: Enhanced Swift-XRT position
  41. GRB 120811C: RTT150 optical observations
  42. GRB 120811C: Bassano Bresciano Observatory optical observations
  43. GRB 120811C: Swift/UVOT Detection
  44. GRB 120811C: RTT150 optical observations
  45. GRB 120811C: Enhanced Swift-XRT position
  46. GRB 120811C: TAROT Calern observatory optical observations
  47. GRB 120811C: Swift detection of a burst with an optical counterpart
  48. Konus-Wind observation of GRB 120811B
  49. Trigger 530588: Swift detection of XMM J174457-2850.3
  50. GRB 120803A: optical upper limit
  51. GRB 120807A: Swift/UVOT Upper Limits
  52. GRB 120802A: optical observations
  53. GRB 120807A: RAPTOR Limits During Gamma-Ray Emitting Interval
  54. GRB 120807A: TAROT La Silla observatory optical observations
  55. GRB 120807A: Swift-BAT refined analysis
  56. GRB 120807A: Enhanced Swift-XRT position
  57. GRB 120807A: Swift detection of a burst
  58. GRB 120805A: Swift/UVOT Upper Limits
  59. Swift trigger 530214: uncertain if real or not
  60. GRB 120802A: Swift/UVOT Upper Limits
  61. GRB 120805A: TAROT Calern observatory optical observations
  62. GRB 120805A: Swift detection of a burst
  63. GRB 120804A: Swift-BAT Spectral lag analysis
  64. GRB 120804A: MITSuME Okayama Optical upper limits
  65. GRB 120804A: Swift/UVOT Upper Limits
  66. GRB 120804A: GROND upper limits
  67. GRB 120804A: Enhanced Swift-XRT position
  68. GRB 120803B: MITSuME Okayama Optical upper limits
  69. GRB 120803A: MITSuME Okayama Optical upper limits
  70. GRB 120804A: Swift detection of a short burst
  71. GRB 120803B: Swift-BAT refined analysis
  72. GRB 120803B: Enhanced Swift-XRT position
  73. GRB 120803B: Swift detection of a burst
  74. GRB 120803A: Swift detection of a possible burst
  75. GRB 120802A: GRT Optical Observation
  76. GRB 120802A Gemini-N redshift
  77. GRB 120802A: APEX/LABOCA submm observations
  78. GRB 120802A: Enhanced Swift-XRT position
  79. GRB 120802A: MASTER optical observations
  80. GRB 120802A: optical uper limit in ISON-NM observatory
  81. GRB 120802A: Swift detection of a burst
  82. Konus-Wind observation of GRB 120728B
  83. GRB 120729A: RTT150 optical observations
  84. Virtual Telescope observations of GRB 120729A
  85. GRB 120729A: Early RAPTOR Observations
  86. T100 observations of GRB 120729A
  87. GRB 120728A: GROND Afterglow discovery
  88. GRB 120729A: Swift/UVOT Detection
  89. GRB 120729A: Enhanced Swift-XRT position
  90. GRB 120728A: Swift/UVOT Upper Limits
  91. GRB 120729A: Swift detection of a burst with an optical afterglow
  92. GRB 120728A: Enhanced Swift-XRT position
  93. Trigger 529076: Swift possible detection of SwJ1910.2-0546
  94. GRB 120728A: GROND observations
  95. GRB 120728A: Swift detection of a burst
  96. GRB 120727A/Galactic source: Fermi-LAT detection of a transient source
  97. Swift Trigger 528925 is probably a noise fluctuation
  98. GRB 120722A: optical upper limit
  99. GRB 120724A: optical observation in Maidanak observatory
  100. GRB 120724A: Swift/UVOT Detection of the Optical Afterglow

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