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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"

19530 results found.

  1. GRB 080702A, Swift-BAT refined analysis
  2. GRB 080702A: Swift-XRT Team refined analysis
  3. GRB 080702B : Burst detected in BAT during Swift slew
  4. GRB 080702A: Enhanced Swift-XRT position
  5. Swift Trigger 315630: TLS R-band observation
  6. Swift Trigger 315630: Probably not a GRB
  7. GRB 080702: Swift detection of a short burst
  8. GRB 080701: Swift-XRT refined analysis
  9. TLS I-Band Observation of GRB 080701A
  10. GRB 080701A: Swift/UVOT Upper Limits
  11. GRB 080701: Enhanced Swift-XRT position
  12. GRB 080701A, Swift-BAT refined analysis
  13. Trigger 315630: Swift detection of a possible burst
  14. GRB 080701: Swift-XRT Prompt Analysis
  15. GRB 080701: Swift detection of a burst
  16. GRB 080623: Suzaku WAM observation of the prompt emission
  17. GRB 080625: Swift/UVOT Follow-Up Observations
  18. GRB 080625:Swift-XRT detection of the afterglow
  19. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  20. GRB 080623: GROND upper limits
  21. GRB080623: Swift UVOT followup observations
  22. GRB 080623: Swift-XRT refined analysis
  23. GRB 080623, Swift-BAT refined analysis
  24. GRB 080623: Enhanced Swift-XRT position
  25. GRB 080623: TAROT La Silla observatory optical observations
  26. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  27. GRB 080623: Swift XRT prompt analysis
  28. GRB 080623: Swift detection of a burst
  29. Swift trigger 314975 is not a GRB
  30. Swift-BAT trigger 314975 possible burst
  31. GRB080607: optical observation
  32. GRB 080603b: optical observation
  33. GRB 070809: Putative host galaxy and redshift
  34. Konus-Wind observation of GRB 080613B
  35. GRB 080613A: Swift-XRT detection of the afterglow
  36. GRB080613A: Swift/UVOT Upper Limits
  37. GRB 080613B: GROND Upper Limits
  38. GRB080613B: Swift/UVOT Upper Limits
  39. GRB 080613B, Swift-BAT refined analysis
  40. GRB 080613B: Swift-XRT refined analysis
  41. GRB 080613B: Swift detection of a burst
  42. GRB 080603b: optical observation
  43. Swift observations of BAT Slew Survey event (Trigger=010)
  44. GRB 080603A: final Swift-XRT observations.
  45. GRB 080607: AGILE-MCAL observation of the prompt emission
  46. GRB 080603B - TLS 2nd Epoch: Another Break
  47. GRB 080605: TLS 3rd Epoch - Source Confusion
  48. Konus-Wind observation of GRB 080607
  49. GRB080607: RTT150 optical observations
  50. GRB 080607: Swift-XRT refined analysis
  51. Swift/UVOT Observations of GRB080607
  52. GRB 080605: optical observations
  53. GRB 080607 KAIT observations
  54. Konus-Wind observation of GRB 080605
  55. GRB 080607: Enhanced Swift-XRT position
  56. GRB 080607, Swift-BAT refined analysis
  57. GRB 080605: GROND 2nd epoch observations
  58. GRB 080607: Swift detection of a burst with optical afterglow
  59. GRB 080607: ROTSE-III Detection of Optical Counterpart
  60. GRB 080605: Swift-UVOT refined analysis
  61. GRB 080604: VLA radio upper limit
  62. GRB 080605, Swift-BAT refined analysis
  63. GRB 080603B: VLA radio upper limit
  64. GRB 080605, Swift-BAT refined analysis
  65. GRB 080605: Swift-XRT refined analysis
  66. GRB 080605: MASTER VWF 46 s AT observation
  67. GRB 080605: Enhanced Swift-XRT position
  68. GRB 080605: GROND detection of the optical afterglow candidate
  69. GRB080605: optical observations
  70. GRB 080605: Liverpool Telescope optical afterglow candidate
  71. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  72. GRB 080605: TLS RRM Afterglow
  73. GRB 080605: Swift detection of a burst with an optical afterglow
  74. GRB 080603B: TLS Afterglow Observation
  75. Swift/UVOT observations of GRB080604
  76. GRB 080604, Swift-BAT refined analysis
  77. GRB 080604: Swift-XRT refined analysis
  78. GRB 080603B : Liverpool Telescope Observations
  79. Konus-Wind observation of GRB 080603B
  80. GRB 080603B: Swift-XRT refined analysis
  81. GRB 080603A: Swift-XRT detection of the afterglow
  82. GRB 080603B: Swift/UVOT detection of the afterglow
  83. GRB 080604: Enhanced Swift-XRT position
  84. GRB 080603B, Swift-BAT refined analysis
  85. GRB 080603A: Swift/UVOT detection of the afterglow
  86. GRB080603B: RTT150 optical observations, break in light curves
  87. GRB 080604: Early Super-LOTIS Observations
  88. GRB 080604: Swift detection of a burst with an optical afterglow
  89. GRB 080516: TAROT La Silla observatory optical observations
  90. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  91. GRB 080603B: Swift detection of a burst with optical afterglow
  92. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  93. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  94. GRB 080602, Swift-BAT refined analysis
  95. GRB 080602: Swift-XRT refined analysis
  96. Konus-Wind observation of GRB 080602
  97. GRB 080602: Enhanced Swift-XRT position
  98. GRB 080602: Swift detection of a burst
  99. Swift analysis of BAT Slew Survey event (Trigger=009)
  100. Konus-Wind observation of reactivation of SGR 1627-41

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