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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"

27398 results found.

  1. GRB 070520A: SARA upper limit
  2. GRB 070521: SARA upper limit
  3. GRB 070521: Subaru observations and possible host detection
  4. GRB 070520B: Swift/UVOT Upper Limits
  5. GRB 070520A: Subaru Observations
  6. GRB 070521, Swift-BAT refined analysis
  7. GRB 070520A: Swift UVOT Upper Limits
  8. GRB 070520B: Swift-XRT refined analysis
  9. GRB 070521: TAROT La Silla observatory optical observations
  10. GRB070521 - SDSS Pre-Burst Observations
  11. GRB 070521: Swift detection of a burst
  12. GRB 070520A: MITSuME Akeno optical upper limits
  13. GRB 070520B, Swift-BAT refined analysis
  14. GRB 070520A, Swift-BAT refined analysis
  15. GRB 070520A: Swift-XRT refined analysis
  16. GRB 070518: TNG observations
  17. GRB 070520B: Swift detection of a burst
  18. GRB 070520: Xinglong EST optical Upper Limit
  19. GRB 070520: Swift detection of a burst
  20. VLA observation of GRB 070518
  21. GRB 070518: Swift-XRT refined analysis
  22. GRB070518: UVOT refined analysis
  23. GRB 070518, Swift-BAT refined analysis
  24. GRB 070518: OT confirmed form Xinglong TNT observation
  25. GRB 070518: Swift detection of a burst with optical afterglow
  26. GRB070517: Swift-XRT Refined Analysis
  27. GRB 070517, Swift-BAT refined analysis
  28. GRB 070517: Optical search
  29. GRB 070517: Swift detection of a burst
  30. GRB 070509: objects inside XRT error circle
  31. GRB 070512: IPN localization and Konus spectrum of a bright burst
  32. GRB070419A: optical observations
  33. GRB 070509: Swift/UVOT Upper Limits
  34. Konus-Wind and Konus-A observation of GRB 070508
  35. GRB 070510: Swift detection of a possible burst
  36. GRB070509: Swift-XRT Refined Analysis
  37. GRB 070509, Swift-BAT refined analysis
  38. GRB 070508: Suzaku/WAM observation of the prompt emission
  39. GRB 070509: REM observations
  40. GRB070508: Swift/UVOT Observations
  41. GRB 070508, Swift-BAT refined analysis
  42. GRB 070508: REM observations
  43. GRB 070508: TAROT La Silla observatory optical observations
  44. GRB 070508: Swift detection of an intense burst with an optical counterpart
  45. GRB070506: Swift/UVOT Observations
  46. GRB070506: Swift XRT refined analysis
  47. GRB 070506, Swift-BAT Refined Analysis
  48. GRB 070506: Swift detection of a burst with optical afterglow
  49. GRB070429B: VLT observations
  50. GRB070429B: position correction
  51. GRB 070309: Swift-XRT afterglow confirmation
  52. VLA observation of GRB 070429B
  53. Swift/UVOT observations of GRB070429B
  54. GRB 070429B, Swift-BAT refined analysis
  55. Swift/UVOT observations of GRB070429A
  56. GRB 070429A, Swift-BAT refined analysis
  57. GRB 070429A: optical and NIR observations
  58. GRB 070429B: Swift XRT refined analysis
  59. GRB 070429B: ROTSE-III Optical Limits
  60. GRB 070429: ROTSE-III Optical Limits
  61. GRB 070429: Swift detection of a burst
  62. GRB 070427, Swift-BAT Refined Analysis
  63. LT monitoring of GRB070412
  64. GRB 070411: Late-time Keck imaging
  65. GRB070419B: Suzaku WAM observation of the prompt emission
  66. GRB 070420, SMARTS optical/IR afterglow observations
  67. GRB 070411, deep LBT photometry
  68. Konus-Wind observation of GRB 070420
  69. GRB 070411: break in the optical light curve
  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. GRB 070420: TAROT La Silla observatory optical observations
  75. GRB 070420: NIR and optical afterglow confirmed
  76. GRB 070420: Swift detection of a burst with optical afterglow
  77. GRB 070419A: MITSuME Okayama Observations
  78. GRB 070419A: Early Super-LOTIS Observations
  79. GRB 070419B, Swift-BAT refined analysis
  80. GRB 070419A Swift-BAT Refined Analysis
  81. GRB 070419A, Optical observations
  82. GRB070419 - SDSS Pre-Burst Observations
  83. GRB 070419A: SARA observations
  84. GRB 070419A: NAYUTA Optical Observation
  85. GRB 070419B optical afterglow candidate
  86. GRB 070419A: Optical and IR observations with KANATA
  87. GRB 070419B: optical afterglow candidate
  88. GRB070419A, optical observation
  89. Infrared detection of GRB070419A with UKIRT
  90. GRB 070419A: Kiso Optical observation
  91. GRB 070419: P60 Confirmation of Optical Afterglow
  92. GRB 070419B: Swift detection of a burst
  93. GRB 070419A: ROTSE-III Optical Limits
  94. GRB 070419: Swift detection of a burst
  95. GRB 070418: Optical and IR observations with KANATA
  96. Trigger 276045: Swift detection of a possible burst
  97. GRB 070406: Swift XRT refined analysis
  98. GRB070412: UKIRT-WFCAM JHK upper limits
  99. GRB070412: Swift UVOT observations
  100. GRB 070411: Swift/UVOT observations

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