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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"

18336 results found.

  1. GRB 070621: Swift detection of a burst
  2. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  3. Swift/UVOT detection of GRB070616 optical afterglow.
  4. GRB070616: Optical Observation by MITSuME Okayama
  5. GRB 070616: TLS observation
  6. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  7. GRB 070616: Swift detection of a burst
  8. GRB 070612B: optical observations
  9. UVOT Observations of INTEGRAL burst GRB070615
  10. VLA upper limit on GRB 070610
  11. GRB 070615
  12. SWIFT J195509.6+261406 (GRB 070610): further observations
  13. GRB 070612A: Super-LOTIS observations
  14. GRB 070612A: Rapid Decay
  15. GRB070612A: MITSuME Okayama Observation
  16. GRB 070612A: continued SARA observations
  17. GRB 070611: Watcher Observations
  18. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  19. GRB 070612B: SARA upper limit
  20. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  21. GRB 070612B: Swift/UVOT upper limits
  22. GRB 070612B: FRAM limit
  23. GRB070612B: P60 Observations
  24. GRB 070612A: SARA detection of possible OT
  25. GRB 070610: TAROT Calern observatory optical observations
  26. GRB 070610: MITSuME OAO optical upper limit
  27. GRB070612 - SDSS Pre-Burst Observations
  28. GRB 070610: SARA upper limit
  29. GRB 070610: Swift-XRT refined analysis
  30. GRB 070611: Swift/UVOT Observations
  31. GRB 070610: Optical observations from OSN
  32. GRB 070610: Watcher Observations
  33. GRB 070611: ROTSE-III Optical Limits
  34. GRB 070610: Swift-UVOT Upper Limits
  35. GRB 070412: TAROT Calern observatory optical observations
  36. GRB 070411: TAROT Calern observatory optical observations
  37. GRB 070531: NOT nIR observations
  38. GRB 070531: I-band observations from IAC80
  39. GRB 070531: Liverpool Telescope Optical Observations
  40. GRB 070529: SARA upper limit
  41. Swift/UVOT refined analysis of GRB070529
  42. GRB 070529: Optical aterglow from MIRO
  43. GRB 070529: Xinglong TNT Optical Upper Limit
  44. GRB 070529: Swift detection of a burst with an optical aterglow
  45. GRB 070412: Deep Keck imaging
  46. Swift trigger 280447 is probably a Galactic transient
  47. GRB070521: Second Epoch Gemini Imaging
  48. GRB 070521: Swift/UVOT Upper Limits
  49. GRB 070521, optical observation
  50. GRB 070521: Swift-XRT refined analysis
  51. GRB 070521: Keck imaging
  52. GRB070521: Gemini Observations
  53. GROND upper limits of GRB 070521
  54. GRB 070520B: SARA upper limit
  55. GRB 070520A: SARA upper limit
  56. GRB 070521: SARA upper limit
  57. GRB 070521: Subaru observations and possible host detection
  58. GRB 070520B: Swift/UVOT Upper Limits
  59. GRB 070520A: Subaru Observations
  60. GRB 070520A: Swift UVOT Upper Limits
  61. GRB 070520B: Swift-XRT refined analysis
  62. GRB 070521: TAROT La Silla observatory optical observations
  63. GRB070521 - SDSS Pre-Burst Observations
  64. GRB 070521: Swift detection of a burst
  65. GRB 070520A: MITSuME Akeno optical upper limits
  66. GRB 070520A: Swift-XRT refined analysis
  67. GRB 070518: TNG observations
  68. GRB 070520B: Swift detection of a burst
  69. GRB 070520: Xinglong EST optical Upper Limit
  70. GRB 070520: Swift detection of a burst
  71. VLA observation of GRB 070518
  72. GRB070518: UVOT refined analysis
  73. GRB 070518: OT confirmed form Xinglong TNT observation
  74. GRB 070518: Swift detection of a burst with optical afterglow
  75. GRB 070517: Swift detection of a burst
  76. GRB 070509: objects inside XRT error circle
  77. GRB 070512: IPN localization and Konus spectrum of a bright burst
  78. GRB 070509: Swift/UVOT Upper Limits
  79. GRB 070509: REM observations
  80. GRB 070508: REM observations
  81. GRB 070508: TAROT La Silla observatory optical observations
  82. GRB 070508: Swift detection of an intense burst with an optical counterpart
  83. GRB070412: MAGIC telescope GeV observation
  84. GRB070506: Swift/UVOT Observations
  85. GRB 070506: Swift detection of a burst with optical afterglow
  86. GRB070429B: VLT observations
  87. GRB070429B: position correction
  88. GRB 070309: Swift-XRT afterglow confirmation
  89. VLA observation of GRB 070429B
  90. Swift/UVOT observations of GRB070429B
  91. Swift/UVOT observations of GRB070429A
  92. GRB 070429A: optical and NIR observations
  93. GRB 070429B: ROTSE-III Optical Limits
  94. GRB 070429: ROTSE-III Optical Limits
  95. GRB 070429: Swift detection of a burst
  96. LT monitoring of GRB070412
  97. GRB 070411: Late-time Keck imaging
  98. GRB070420: Swift UVOT continuing observations
  99. GRB 070420: Faulkes Telescope South Observations
  100. GBR 070419A: Swift/XRT refined analysis

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