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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

20498 results found.

  1. GRB 070531: Liverpool Telescope Optical Observations
  2. GRB 070529: SARA upper limit
  3. Swift/UVOT refined analysis of GRB070529
  4. GRB 070529: Optical aterglow from MIRO
  5. GRB 070529, Swift-BAT refined analysis
  6. GRB 070529: Xinglong TNT Optical Upper Limit
  7. GRB 070529: Swift detection of a burst with an optical aterglow
  8. GRB 070412: Deep Keck imaging
  9. Swift trigger 280447 is probably a Galactic transient
  10. GRB070521: Second Epoch Gemini Imaging
  11. GRB 070521: Swift/UVOT Upper Limits
  12. GRB 070521, optical observation
  13. GRB 070521: Swift-XRT refined analysis
  14. GRB 070521: Keck imaging
  15. GRB070521: Gemini Observations
  16. GROND upper limits of GRB 070521
  17. GRB 070520B: SARA upper limit
  18. GRB 070520A: SARA upper limit
  19. GRB 070521: SARA upper limit
  20. GRB 070521: Subaru observations and possible host detection
  21. GRB 070520B: Swift/UVOT Upper Limits
  22. GRB 070520A: Subaru Observations
  23. GRB 070520A: Swift UVOT Upper Limits
  24. GRB 070521: TAROT La Silla observatory optical observations
  25. GRB070521 - SDSS Pre-Burst Observations
  26. GRB 070521: Swift detection of a burst
  27. GRB 070520A: MITSuME Akeno optical upper limits
  28. GRB 070520B, Swift-BAT refined analysis
  29. GRB 070520A: Swift-XRT refined analysis
  30. GRB 070518: TNG observations
  31. GRB 070520B: Swift detection of a burst
  32. GRB 070520: Xinglong EST optical Upper Limit
  33. GRB 070520: Swift detection of a burst
  34. VLA observation of GRB 070518
  35. GRB 070518: Swift-XRT refined analysis
  36. GRB070518: UVOT refined analysis
  37. GRB 070518: OT confirmed form Xinglong TNT observation
  38. GRB 070518: Swift detection of a burst with optical afterglow
  39. GRB 070517: Swift detection of a burst
  40. GRB 070509: objects inside XRT error circle
  41. GRB 070512: IPN localization and Konus spectrum of a bright burst
  42. GRB 070419A, Deep LBT photometry
  43. GRB 070508: pseudo-z from 4 different spectral analyses
  44. GRB 070509: Swift/UVOT Upper Limits
  45. GRB070509: Swift-XRT Refined Analysis
  46. GRB 070508: Suzaku/WAM observation of the prompt emission
  47. GRB 070509: REM observations
  48. GRB 070508: REM observations
  49. GRB 070508: TAROT La Silla observatory optical observations
  50. GRB 070508: Swift detection of an intense burst with an optical counterpart
  51. GRB070412: MAGIC telescope GeV observation
  52. GRB070506: Swift/UVOT Observations
  53. GRB 070506: Swift detection of a burst with optical afterglow
  54. GRB070429B: VLT observations
  55. GRB070429B: position correction
  56. GRB 070309: Swift-XRT afterglow confirmation
  57. GRB070429B: possible host galaxy detection
  58. VLA observation of GRB 070429B
  59. Swift/UVOT observations of GRB070429B
  60. GRB 070429B, Swift-BAT refined analysis
  61. Swift/UVOT observations of GRB070429A
  62. GRB 070429A: optical and NIR observations
  63. GRB 070429B: Swift XRT refined analysis
  64. GRB 070429B: ROTSE-III Optical Limits
  65. GRB 070429: ROTSE-III Optical Limits
  66. GRB 070429: Swift detection of a burst
  67. LT monitoring of GRB070412
  68. GRB 070411: Late-time Keck imaging
  69. GRB 070411, deep LBT photometry
  70. GRB 070420 Swift-BAT Refined Analysis
  71. GRB 070420: optical rebrightening observed at Mt. John
  72. GRB070420: Swift UVOT continuing observations
  73. GRB 070420: Faulkes Telescope South Observations
  74. GBR 070419A: Swift/XRT refined analysis
  75. GRB 070420: TAROT La Silla observatory optical observations
  76. GRB 070420: NIR and optical afterglow confirmed
  77. GRB 070420: Swift detection of a burst with optical afterglow
  78. GRB 070419A: MITSuME Okayama Observations
  79. GRB 070419B, Swift-BAT refined analysis
  80. GRB 070419A, Optical observations
  81. GRB070419 - SDSS Pre-Burst Observations
  82. GRB 070419A: SARA observations
  83. GRB 070419A: NAYUTA Optical Observation
  84. GRB 070419A: Optical and IR observations with KANATA
  85. GRB070419A, optical observation
  86. Infrared detection of GRB070419A with UKIRT
  87. GRB 070419A: Kiso Optical observation
  88. GRB 070419: P60 Confirmation of Optical Afterglow
  89. GRB 070419B: Swift detection of a burst
  90. GRB 070419A: ROTSE-III Optical Limits
  91. GRB 070419: Swift detection of a burst
  92. GRB 070418: Optical and IR observations with KANATA
  93. Trigger 276045: Swift detection of a possible burst
  94. GRB 070406: Swift XRT refined analysis
  95. GRB070412: UKIRT-WFCAM JHK upper limits
  96. GRB070412: Swift UVOT observations
  97. GRB 070411: Swift/UVOT observations
  98. GRB 070412, Swift-BAT refined analysis
  99. GRB 070412 Liverpool Telescope optical limit
  100. GRB 070412: Swift-XRT refined analysis

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