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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"

19361 results found.

  1. GRB 080710: Enhanced Swift-XRT position
  2. UVOT white band observations of GRB080710
  3. GRB 080710: KAIT OA candidate
  4. GRB 080710: Swift XRT position
  5. GRB 080710: Swift detection of a burst
  6. GRB 080707: possible break in the X-rays
  7. New Swift-XRT GRB products available online.
  8. GRB 080707: GROND Confirmation of the Optical Afterglow
  9. UVOT observations of GRB080707
  10. GRB 080707, Swift-BAT refined analysis
  11. GRB 080707: Swift XRT refined analysis
  12. GRB 080707: Enhanced Swift-XRT position
  13. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  14. GRB 080707: Swift detection of a burst
  15. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  16. Trigger 316063: Swift detection of a transient
  17. GRB 080703: GROND Upper Limits
  18. GRB 080702B: GROND Upper Limits
  19. GRB 080703: Swift-XRT refined analysis
  20. GRB 080703: UVOT Follow-Up Observation
  21. GRB 080703: Enhanced Swift-XRT position
  22. GRB 080703, Swift-BAT refined analysis
  23. GRB 080702B Swift-BAT refined analysis
  24. GRB 080703: Swift detection of a burst with optical afterglow
  25. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  26. Swift/UVOT observation of GRB080702A
  27. GRB 080702B: Swift XRT and UVOT observations
  28. GRB 080701A: Early RAPTOR optical limits
  29. Swift Trigger 315630: Swift/UVOT Upper Limits
  30. GRB 080702A, Swift-BAT refined analysis
  31. GRB 080702A: Swift-XRT Team refined analysis
  32. GRB 080702B : Burst detected in BAT during Swift slew
  33. GRB 080702A: Enhanced Swift-XRT position
  34. Swift Trigger 315630: TLS R-band observation
  35. Swift Trigger 315630: Probably not a GRB
  36. GRB 080702: Swift detection of a short burst
  37. GRB 080701: Swift-XRT refined analysis
  38. TLS I-Band Observation of GRB 080701A
  39. GRB 080701A: Swift/UVOT Upper Limits
  40. GRB 080701: Enhanced Swift-XRT position
  41. GRB 080701A, Swift-BAT refined analysis
  42. Trigger 315630: Swift detection of a possible burst
  43. GRB 080701: Swift-XRT Prompt Analysis
  44. GRB 080701: Swift detection of a burst
  45. GRB 080623: Suzaku WAM observation of the prompt emission
  46. GRB 080625: Swift/UVOT Follow-Up Observations
  47. GRB 080625:Swift-XRT detection of the afterglow
  48. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  49. GRB 080623: GROND upper limits
  50. GRB080623: Swift UVOT followup observations
  51. GRB 080623: Swift-XRT refined analysis
  52. GRB 080623, Swift-BAT refined analysis
  53. GRB 080623: Enhanced Swift-XRT position
  54. GRB 080623: TAROT La Silla observatory optical observations
  55. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  56. GRB 080623: Swift XRT prompt analysis
  57. GRB 080623: Swift detection of a burst
  58. Swift trigger 314975 is not a GRB
  59. Swift-BAT trigger 314975 possible burst
  60. GRB080607: optical observation
  61. GRB 080603b: optical observation
  62. GRB 070809: Putative host galaxy and redshift
  63. Konus-Wind observation of GRB 080613B
  64. GRB 080613A: Swift-XRT detection of the afterglow
  65. GRB080613A: Swift/UVOT Upper Limits
  66. GRB 080613B: GROND Upper Limits
  67. GRB080613B: Swift/UVOT Upper Limits
  68. GRB 080613B, Swift-BAT refined analysis
  69. GRB 080613B: Swift-XRT refined analysis
  70. GRB 080613B: Swift detection of a burst
  71. GRB 080603b: optical observation
  72. Swift observations of BAT Slew Survey event (Trigger=010)
  73. GRB 080603A: final Swift-XRT observations.
  74. GRB 080607: AGILE-MCAL observation of the prompt emission
  75. GRB 080603B - TLS 2nd Epoch: Another Break
  76. GRB 080605: TLS 3rd Epoch - Source Confusion
  77. Konus-Wind observation of GRB 080607
  78. GRB080607: RTT150 optical observations
  79. GRB 080607: Swift-XRT refined analysis
  80. Swift/UVOT Observations of GRB080607
  81. GRB 080605: optical observations
  82. GRB 080607 KAIT observations
  83. Konus-Wind observation of GRB 080605
  84. GRB 080607: Enhanced Swift-XRT position
  85. GRB 080607, Swift-BAT refined analysis
  86. GRB 080605: GROND 2nd epoch observations
  87. GRB 080607: Swift detection of a burst with optical afterglow
  88. GRB 080607: ROTSE-III Detection of Optical Counterpart
  89. GRB 080605: Swift-UVOT refined analysis
  90. GRB 080604: VLA radio upper limit
  91. GRB 080605, Swift-BAT refined analysis
  92. GRB 080603B: VLA radio upper limit
  93. GRB 080605, Swift-BAT refined analysis
  94. GRB 080605: Swift-XRT refined analysis
  95. GRB 080605: MASTER VWF 46 s AT observation
  96. GRB 080605: Enhanced Swift-XRT position
  97. GRB 080605: GROND detection of the optical afterglow candidate
  98. GRB080605: optical observations
  99. GRB 080605: Liverpool Telescope optical afterglow candidate
  100. GRB 080605: Swift/UVOT Position of the Optical Afterglow

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