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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"

28057 results found.

  1. GRB 070724B: P60 Observations
  2. GRB 070724B: Swift/UVOT Upper limits
  3. GRB 070724B: Swift-XRT afterglow likely candidate
  4. GRB 070721A: optical observations
  5. GRB 070724A: further VLT observations
  6. GRB 070724B: Suzaku WAM observation of the prompt emission
  7. GRB 070724B: Swift-XRT afterglow candidates
  8. Four radio sources in Swift-XRT error box of GRB 070724
  9. GRB 070724: P60 and Gemini Observations
  10. GRB 060814 - Keck host detection and redshift
  11. Swift/UVOT refined analysis of GRB070724
  12. GRB 070724: Swift-XRT Team refined analysis
  13. GRB 070724, Swift-BAT refined analysis of a short burst
  14. GRB 070721B: further observations and analysis
  15. GRB 070724: Swift detection of a burst
  16. GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
  17. GRB 070714B: Keck observations
  18. GRB 070721B: optical observations and proposed redshift
  19. GRB 070721B, Further Swift-BAT refined analysis
  20. Swift/UVOT Observations of GRB070721A
  21. GRB 070721B : Faulkes Telescope South observations
  22. GRB 070721B: Swift-XRT refined analysis
  23. GRB 070721A : Faulkes Telescope South optical limit
  24. GRB 070721A: Swift/XRT refined analysis
  25. GRB 070721B, Swift-BAT refined analysis
  26. GRB 070721A, Swift-BAT refined analysis
  27. GRB070721B: A bright UVOT candidate
  28. GRB 070714B: Swift/BAT and Suzaku/WAM joint spectral analysis
  29. GRB 070714B : Suzaku WAM observation of the prompt emission
  30. GRB070714B: TNG NIR observations
  31. Erratum : Suzaku WAM observation of GRB 070704
  32. GRB 070714A: Swift/UVOT Upper limits
  33. GRB 070714B: Swift/UVOT Upper Limits
  34. GRB 070714B: confirmation of optical afterglow
  35. GRB 070616: No Evidence for I Band Afterglow
  36. GRB 070714A: Swift XRT refined analysis
  37. GRB070714B: Swift-XRT refined analysis
  38. GRB 070707: Swift-XRT follow-up observations
  39. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  40. GRB 070714A, Swift-BAT refined analysis
  41. GRB 070714 : Liverpool Telescope optical counterpart ?
  42. GRB 070714: Swift detection of a bright burst, possibly short
  43. SN 2007bg - off-axis GRB?
  44. GRB 070704: RTT150 optical observations
  45. GRB 070704: Suzaku/WAM observation of the prompt emission
  46. Konus-Wind observation of GRB 070707
  47. GRB 070707: optical afterglow
  48. Swift/UVOT Observations of GRB070707
  49. Swift XRT observation of GRB 070707
  50. GRB 070707: VLT observations
  51. GRB070704: FAVOR optical observations
  52. GRB 070704 : Liverpool Telescope Observations
  53. GRB 070611: VLT observations
  54. VLA detection of GRB 070612A in C Band
  55. GRB 070704: Swift-XRT refined analysis
  56. Swift/UVOT Observations of GRB070704
  57. GRB 070704, Swift-BAT refined analysis
  58. GRB 070704: Correction to GCN Circ 6594
  59. GRB 070704: Swift detection of a burst
  60. GRB 070626: Suzaku/WAM observation of the prompt emission
  61. GRB 070628 Swift-UVOT Refined Analysis
  62. GRB 070628: NIR detection of afterglow
  63. GRB 070628, Swift-BAT refined analysis
  64. GRB 070628: TAROT La Silla observatory optical observations
  65. Swift UVOT Observations of GRB 070628
  66. OT20050728 was not an optical GRB afterglow
  67. GRB 070616 : WIDGET simultaneous optical observations
  68. GRB 070616: Suzaku/WAM observation of the prompt emission
  69. GRB070621: RTT150 optical observations
  70. GRB 070621: VLT optical observations
  71. GRB 070621: Swift/UVOT Upper Limits
  72. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  73. GRB 070621: Swift-BAT refined analysis
  74. GRB070621: Swift XRT refined analysis
  75. GRB 070621: Gemini South optical imaging
  76. GRB 070621: UVOT-enhanced XRT position
  77. Observations of GRB070612A at Calar Alto
  78. GRB 070621: NOT observations
  79. GRB070621: OPTIMA-Burst optical upper limit
  80. GRB 070621: TAROT Calern observatory optical observations
  81. GRB 070621: Watcher Observations
  82. GRB 070621: Swift detection of a burst
  83. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  84. Swift/UVOT detection of GRB070616 optical afterglow.
  85. GRB 070612A: NOT observations
  86. GRB070616: Optical Observation by MITSuME Okayama
  87. GRB 070616, Swift-BAT further refined analysis
  88. GRB 070616: BTA optical observations
  89. GRB 070616: TLS observation
  90. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  91. GRB 070616: Swift detection of a burst
  92. GRB 070612B: optical observations
  93. UVOT Observations of INTEGRAL burst GRB070615
  94. VLA upper limit on GRB 070610
  95. GRB 070615
  96. SWIFT J195509.6+261406 (GRB 070610): further observations
  97. GRB 070612A: Super-LOTIS observations
  98. GRB 070612A: Rapid Decay
  99. GRB 070612A: Suzaku/WAM observation of the prompt emission
  100. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations

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