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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"

19548 results found.

  1. GRB 070704: Swift detection of a burst
  2. GRB 070628 Swift-UVOT Refined Analysis
  3. GRB 070628: NIR detection of afterglow
  4. GRB 070628: TAROT La Silla observatory optical observations
  5. GRB 070612A: Allen Telescope Array Observations
  6. GRB 070616 : WIDGET simultaneous optical observations
  7. GRB070621: RTT150 optical observations
  8. GRB 070621: VLT optical observations
  9. GRB 070621: Swift/UVOT Upper Limits
  10. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  11. GRB 070621: Gemini South optical imaging
  12. GRB 070621: UVOT-enhanced XRT position
  13. Observations of GRB070612A at Calar Alto
  14. GRB 070621: NOT observations
  15. GRB 070621: TAROT Calern observatory optical observations
  16. GRB 070621: Watcher Observations
  17. GRB 070621: Swift detection of a burst
  18. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  19. Swift/UVOT detection of GRB070616 optical afterglow.
  20. GRB070616: Optical Observation by MITSuME Okayama
  21. GRB 070616: TLS observation
  22. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  23. GRB 070616: Swift detection of a burst
  24. GRB 070612B: optical observations
  25. UVOT Observations of INTEGRAL burst GRB070615
  26. VLA upper limit on GRB 070610
  27. GRB 070615
  28. SWIFT J195509.6+261406 (GRB 070610): further observations
  29. GRB 070612A: Super-LOTIS observations
  30. GRB 070612A: Rapid Decay
  31. GRB070612A: MITSuME Okayama Observation
  32. GRB 070612A: continued SARA observations
  33. GRB 070611: Watcher Observations
  34. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  35. GRB 070612B: SARA upper limit
  36. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  37. GRB 070612B: Swift/UVOT upper limits
  38. GRB 070612B: FRAM limit
  39. GRB070612B: P60 Observations
  40. GRB 070612A: SARA detection of possible OT
  41. GRB 070610: TAROT Calern observatory optical observations
  42. GRB 070610: MITSuME OAO optical upper limit
  43. GRB070612 - SDSS Pre-Burst Observations
  44. GRB 070610: SARA upper limit
  45. GRB 070610: Swift-XRT refined analysis
  46. GRB 070611: Swift/UVOT Observations
  47. GRB 070610: Optical observations from OSN
  48. GRB 070610: Watcher Observations
  49. GRB 070611: ROTSE-III Optical Limits
  50. GRB 070610: Swift-UVOT Upper Limits
  51. GRB 070412: TAROT Calern observatory optical observations
  52. GRB 070411: TAROT Calern observatory optical observations
  53. GRB 070531: NOT nIR observations
  54. GRB 070531: I-band observations from IAC80
  55. GRB 070531: Liverpool Telescope Optical Observations
  56. GRB 070531: Swift detection of a burst
  57. GRB 070529: SARA upper limit
  58. Swift/UVOT refined analysis of GRB070529
  59. GRB 070529: Optical aterglow from MIRO
  60. GRB 070529: Xinglong TNT Optical Upper Limit
  61. GRB 070529: Swift detection of a burst with an optical aterglow
  62. GRB 070412: Deep Keck imaging
  63. Swift trigger 280447 is probably a Galactic transient
  64. GRB070521: Second Epoch Gemini Imaging
  65. GRB 070521: Swift/UVOT Upper Limits
  66. GRB 070521, optical observation
  67. GRB 070521: Swift-XRT refined analysis
  68. GRB 070521: Keck imaging
  69. GRB070521: Gemini Observations
  70. GROND upper limits of GRB 070521
  71. GRB 070520B: SARA upper limit
  72. GRB 070520A: SARA upper limit
  73. GRB 070521: SARA upper limit
  74. GRB 070521: Subaru observations and possible host detection
  75. GRB 070520B: Swift/UVOT Upper Limits
  76. GRB 070520A: Subaru Observations
  77. GRB 070520A: Swift UVOT Upper Limits
  78. GRB 070521: TAROT La Silla observatory optical observations
  79. GRB070521 - SDSS Pre-Burst Observations
  80. GRB 070521: Swift detection of a burst
  81. GRB 070520A: MITSuME Akeno optical upper limits
  82. GRB 070518: TNG observations
  83. GRB 070520B: Swift detection of a burst
  84. GRB 070520: Xinglong EST optical Upper Limit
  85. GRB 070520: Swift detection of a burst
  86. VLA observation of GRB 070518
  87. GRB070518: UVOT refined analysis
  88. GRB 070518: OT confirmed form Xinglong TNT observation
  89. GRB 070518: Swift detection of a burst with optical afterglow
  90. GRB 070517: Swift detection of a burst
  91. GRB 070509: objects inside XRT error circle
  92. GRB 070512: IPN localization and Konus spectrum of a bright burst
  93. GRB 070509: Swift/UVOT Upper Limits
  94. Konus-Wind and Konus-A observation of GRB 070508
  95. GRB 070509: REM observations
  96. GRB 070509: Swift detection of a burst
  97. GRB 070508: Multicolor optical observations and possible redshift limit
  98. GRB 070508: Optical observation limiting magnitude
  99. GRB 070508: REM observations
  100. GRB 070508: TAROT La Silla observatory optical observations

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