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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"

21263 results found.

  1. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  2. GRB 070612B: Swift/UVOT upper limits
  3. GRB 070612B: FRAM limit
  4. GRB070612B: P60 Observations
  5. GRB 070612A: SARA detection of possible OT
  6. GRB 070610: TAROT Calern observatory optical observations
  7. GRB 070610: MITSuME OAO optical upper limit
  8. GRB070612 - SDSS Pre-Burst Observations
  9. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  10. GRB 070610: SARA upper limit
  11. GRB 070610: Swift-XRT refined analysis
  12. GRB 070611: Swift/UVOT Observations
  13. GRB 070611: Swift-XRT refined analysis
  14. GRB 070610: Optical observations from OSN
  15. GRB 070610: Watcher Observations
  16. GRB 070611: ROTSE-III Optical Limits
  17. GRB 070610: Swift-UVOT Upper Limits
  18. GRB 070412: TAROT Calern observatory optical observations
  19. GRB 070411: TAROT Calern observatory optical observations
  20. GRB 070531: NOT nIR observations
  21. GRB 070531: I-band observations from IAC80
  22. GRB 070531: Liverpool Telescope Optical Observations
  23. GRB 070529: SARA upper limit
  24. Swift/UVOT refined analysis of GRB070529
  25. GRB 070529: Optical aterglow from MIRO
  26. GRB 070529: Xinglong TNT Optical Upper Limit
  27. GRB 070529: Swift detection of a burst with an optical aterglow
  28. GRB 070412: Deep Keck imaging
  29. Swift trigger 280447 is probably a Galactic transient
  30. GRB 070518: MARGE Observations
  31. Konus-Wind observation of GRB 070521
  32. GRB070521: Second Epoch Gemini Imaging
  33. GRB 070521: Swift/UVOT Upper Limits
  34. GRB 070521, optical observation
  35. GRB 070521: Swift-XRT refined analysis
  36. GRB 070521: Keck imaging
  37. GRB070521: Gemini Observations
  38. GROND upper limits of GRB 070521
  39. GRB 070520B: SARA upper limit
  40. GRB 070520A: SARA upper limit
  41. GRB 070521: SARA upper limit
  42. GRB 070521: Subaru observations and possible host detection
  43. GRB 070520B: Swift/UVOT Upper Limits
  44. GRB 070520A: Subaru Observations
  45. GRB 070520A: Swift UVOT Upper Limits
  46. GRB 070521: TAROT La Silla observatory optical observations
  47. GRB070521 - SDSS Pre-Burst Observations
  48. GRB 070521: Swift detection of a burst
  49. GRB 070520A: MITSuME Akeno optical upper limits
  50. GRB 070518: TNG observations
  51. GRB 070520B: Swift detection of a burst
  52. GRB 070520: Xinglong EST optical Upper Limit
  53. GRB 070520: Swift detection of a burst
  54. VLA observation of GRB 070518
  55. GRB070518: UVOT refined analysis
  56. GRB 070518, Swift-BAT refined analysis
  57. GRB 070518: OT confirmed form Xinglong TNT observation
  58. GRB 070518: Swift detection of a burst with optical afterglow
  59. GRB 070517: Optical search
  60. GRB 070517: Swift detection of a burst
  61. GRB 070509: objects inside XRT error circle
  62. GRB 070512: IPN localization and Konus spectrum of a bright burst
  63. GRB 070509: Swift/UVOT Upper Limits
  64. Konus-Wind and Konus-A observation of GRB 070508
  65. RHESSI Spectrum of GRB070508
  66. GRB 070508: Suzaku/WAM observation of the prompt emission
  67. GRB 070509: REM observations
  68. GRB 070509: ROTSE-III Optical Limits
  69. GRB070508: Swift/UVOT Observations
  70. GRB 070508, Swift-BAT refined analysis
  71. GRB 070508: REM observations
  72. GRB 070508: TAROT La Silla observatory optical observations
  73. GRB 070508: Swift detection of an intense burst with an optical counterpart
  74. GRB070506: Swift/UVOT Observations
  75. GRB 070506: Swift detection of a burst with optical afterglow
  76. GRB070429B: VLT observations
  77. GRB070429B: position correction
  78. GRB 070309: Swift-XRT afterglow confirmation
  79. VLA observation of GRB 070429B
  80. Swift/UVOT observations of GRB070429B
  81. Swift/UVOT observations of GRB070429A
  82. GRB 070429A: optical and NIR observations
  83. GRB 070429B: ROTSE-III Optical Limits
  84. GRB 070429: ROTSE-III Optical Limits
  85. GRB 070429: Swift detection of a burst
  86. LT monitoring of GRB070412
  87. GRB 070427: Swift detection of a burst
  88. GRB 070411: Late-time Keck imaging
  89. GRB070419B: Suzaku WAM observation of the prompt emission
  90. Konus-Wind observation of GRB 070420
  91. GRB 070420 Swift-BAT Refined Analysis
  92. GRB070420: Swift UVOT continuing observations
  93. GRB 070420: Faulkes Telescope South Observations
  94. GBR 070419A: Swift/XRT refined analysis
  95. GRB 070420: TAROT La Silla observatory optical observations
  96. GRB 070420: NIR and optical afterglow confirmed
  97. GRB 070420: Swift detection of a burst with optical afterglow
  98. GRB 070419A: MITSuME Okayama Observations
  99. GRB 070419A: Early Super-LOTIS Observations
  100. GRB070419 - SDSS Pre-Burst Observations

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