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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"

27774 results found.

  1. GRB 100902A: Swift/UVOT Upper Limits
  2. GRB 100902A: optical observation at Mt.Terskol
  3. GRB 100901A: optical observation at Mt.Terskol
  4. GRB 100902A: Enhanced Swift-XRT position
  5. GRB 100901A: TLS Observations: Break?
  6. GRB 100902A: MASTER Prompt Optical Observations
  7. GRB 100901A: ISON-NM optical observations
  8. GRB 100902A: MASTER Optical Early Limit
  9. GRB 100902A: Swift detection of a burst
  10. GRB 100901A: 1.5m OSN BVRI-band observations.
  11. GRB 100901A: ROTSE-III Detection
  12. Swift/UVOT Observations of GRB100901A
  13. GRB 100901A: Swift-XRT Team refined analysis
  14. GRB 100901A: Swift-BAT refined analysis
  15. GRB 100901A: optical observation at Mt.Terskol
  16. GRB 100901A: Enhanced Swift-XRT position
  17. GRB 100901A: optical observation at Mt.Terskol
  18. GRB 100901A: MASTER power low decay
  19. GRB 100901A: MASTER: the OT brightenning
  20. GRB 100901A: confirmation of the afterglow
  21. GRB 100901A: MASTER Optical Early Limits
  22. GRB 100901A: Faulkes Telescope North afterglow candidate
  23. GRB 100901A: Swift detection of a burst with an optical afterglow
  24. GRB 100823A: optical upper limit
  25. GRB 100814A: Maidanak optical observations
  26. GRB 100823A: optical observations
  27. GRB 100823A: MAXI/GSC detection
  28. GRB 100725B: Mondy optical upper limit
  29. GRB 100725B: Maidanak optical upper limit
  30. GRB 100823A: Swift/UVOT Evidence for Fading Afterglow Emission
  31. GRB100807A: R band observations
  32. GRB100823A : MOA optical observation
  33. GRB 100823A: Swift XRT refined analysis
  34. GRB 100823A - second epoch WHT observations
  35. GRB 100823: 1.5m OSN I-band observations
  36. GRB 100823A: Swift/UVOT Upper Limits
  37. GRB 100823A: Swift-BAT refined analysis
  38. GRB 100823A: Enhanced Swift-XRT position
  39. GRB 100823A: Swift detection of a burst
  40. GRB 100814A: Suzaku WAM observation of the prompt emission
  41. GRB 100814A: ISON-NM optical observations
  42. EVLA radio afterglow detection of GRB 100814A
  43. GRB 100814B: Fermi GBM detection
  44. GRB 100814A: optical observations
  45. Konus-Wind observation of GRB 100816A
  46. GRB 100816A: Fermi GBM observation
  47. GRB 100814A : Liverpool Telescope Observations
  48. Konus-Wind observation of GRB 100814A
  49. GRB 100816A: Gemini-N spectroscopy
  50. GRB 100816A: Swift UVOT Observations
  51. GRB100816A Swift-XRT refined analysis
  52. GRB 100816A: Swift-BAT spectral lag results
  53. GRB 100816A: 1.23m CAHA optical observations
  54. GRB 100816A, Swift-BAT refined analysis
  55. GRB 100816A: Enhanced Swift-XRT position
  56. GRB 100816A: CQUEAN riz-band Detection, Host Galaxy?
  57. GRB100814A - interesting UVOT lightcurve.
  58. GRB 100816A: TAROT Calern observatory optical detection
  59. GRB100816A: TNG optical afterglow confirmation.
  60. GRB 100816A: ROTSE-III Optical Limits
  61. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  62. Swift-BAT trigger 431756 is not a burst
  63. Swift/UVOT observations of GRB100814A - title correction to GCN 11097
  64. GRB 100814A: Fermi GBM observation
  65. Swift/UVOT Observations of GRB100814A - a clearer table.
  66. GRB 100814A: Swift-XRT refined analysis
  67. Swift/UVOT observations of GRB100814A
  68. GRB 100814A, Swift-BAT refined analysis
  69. GRB 100814A: Enhanced Swift-XRT position
  70. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  71. GRB 100814A: IAC80 R-band observations
  72. GRB 100814A: Swift UVOT observations of the optical afterglow
  73. GRB 100814A: Swift detection of a burst with an optical afterglow
  74. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  75. Swift-BAT trigger 431582 likely is IGR J17464-2811
  76. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  77. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening
  78. GRB 100807A: P200 Infrared Observations
  79. GRB100807A: optical observation in CrAO
  80. GRB 100805A: optical observation in CrAO
  81. GRB 100807A: Swift XRT refined analysis
  82. GRB 100807A: P60 Optical Afterglow Discovery
  83. GRB 100807A: Swift/UVOT Upper Limits
  84. GRB 100807A: Enhanced Swift-XRT position
  85. GRB 100807A: Swift-BAT refined analysis
  86. GRB 100807A: ROTSE-III Optical Limits
  87. GRB 100807A: Swift detection of a burst
  88. GRB 100805A: Early RAPTOR Observations
  89. GRB 100805A: ROTSE-III Optical detection
  90. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  91. Swift-BAT trigger 430975 is not a burst
  92. GRB 100805A: Swift-BAT refined analysis
  93. GRB 100805A: Swift-XRT Refined Analysis
  94. Trigger 430975: Swift detection of a possible burst
  95. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  96. GRB 100805A: Enhanced Swift-XRT position
  97. GRB 100805A: Liverpool Telescope afterglow observations
  98. GRB 100805A: P60 Optical Afterglow Candidate
  99. GRB 100805A: Enhanced Swift-XRT position
  100. GRB 100805A: ROTSE-III Optical Limits

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