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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"

37518 results found.

  1. GRB 070518: OT confirmed form Xinglong TNT observation
  2. GRB 070518: Swift detection of a burst with optical afterglow
  3. GRB 070517, Swift-BAT refined analysis
  4. GRB 070517: Optical search
  5. GRB 070517: Swift detection of a burst
  6. GRB 070509: objects inside XRT error circle
  7. GRB 070512: pseudo-z ~ 1.39 from prompt emission spectrum
  8. GRB 070512: IPN localization and Konus spectrum of a bright burst
  9. GRB070419A: optical observations
  10. GRB 070419A, Deep LBT photometry
  11. GRB 070508: pseudo-z from 4 different spectral analyses
  12. GRB 070509: Swift/UVOT Upper Limits
  13. Konus-Wind and Konus-A observation of GRB 070508
  14. Swift-BAT trigger 278987 is not a GRB
  15. GRB 070510: Swift detection of a possible burst
  16. GRB070509: Swift-XRT Refined Analysis
  17. GRB 070508: OA fading and tentative redshift
  18. GRB 070509, Swift-BAT refined analysis
  19. GRB 070508: Suzaku/WAM observation of the prompt emission
  20. GRB 070509: REM observations
  21. GRB 070509: Swift detection of a burst
  22. GRB 070509: ROTSE-III Optical Limits
  23. GRB070508: Swift/UVOT Observations
  24. GRB 070508, SMARTS optical afterglow observation
  25. GRB 070508, Swift-BAT refined analysis
  26. GRB 070508: Multicolor optical observations and possible redshift limit
  27. GRB 070508: Swift-XRT refined analysis
  28. GRB 070508: Optical observation limiting magnitude
  29. GRB 070508: Optical afterglow detection
  30. GRB 070508: REM observations
  31. GRB 070508: TAROT La Silla observatory optical observations
  32. GRB 070508: Swift detection of an intense burst with an optical counterpart
  33. Swift-BAT trigger 278809 is not a GRB
  34. GRB 070507: Swift detection of a possible cosmic ray shower event or a possible burst
  35. GRB 070506: VLT redshift
  36. GRB070506: Swift XRT refined analysis
  37. GRB 070506, Swift-BAT Refined Analysis
  38. GRB 070506: Swift detection of a burst with optical afterglow
  39. GRB 070412, deep LBT imaging
  40. GRB 070429A: Swift XRT further analysis
  41. GRB070429B: VLT observations
  42. GRB 070429A: optical observations
  43. GRB 070309: Swift-XRT afterglow confirmation
  44. GRB070429B: possible host galaxy detection
  45. VLA observation of GRB 070429B
  46. Swift/UVOT observations of GRB070429B
  47. GRB 070429B, Swift-BAT refined analysis
  48. Swift/UVOT observations of GRB070429A
  49. GRB 070429A: Swift XRT refined analysis
  50. GRB 070429A, Swift-BAT refined analysis
  51. GRB 070429A: optical and NIR observations
  52. GRB 070429B: Swift XRT refined analysis
  53. GRB 070429B: ROTSE-III Optical Limits
  54. GRB 070429B: Swift detection of a short burst
  55. GRB 070429: What's the temperature?
  56. GRB 070429: ROTSE-III Optical Limits
  57. GRB 070429: Swift detection of a burst
  58. GRB 070427, Swift-BAT Refined Analysis
  59. LT monitoring of GRB070412
  60. GRB 070427: Swift detection of a burst
  61. GRB 070411, further deep LBT photometry
  62. GRB 070411: Late-time Keck imaging
  63. GRB 070411 : Planned XMM-Newton observation
  64. GRB070419B: Suzaku WAM observation of the prompt emission
  65. GRB 070420, SMARTS optical/IR afterglow observations
  66. GRB 070411, deep LBT photometry
  67. GRB 070420: pseudo-z~1.56 from spectral parameters of the prompt
  68. Konus-Wind observation of GRB 070420
  69. GRB 070411: break in the optical light curve
  70. GRB 070420 Swift-BAT Refined Analysis
  71. GRB070419a: Swift UVOT observations
  72. GRB 070419A: MARGE Observations
  73. GRB 070420: optical rebrightening observed at Mt. John
  74. GRB 070420: Swift XRT refined analysis
  75. GRB 070411: BART early limit
  76. GRB 070420: Faulkes Telescope South Observations
  77. GBR 070419A: Swift/XRT refined analysis
  78. GRB 070420: TAROT La Silla observatory optical observations
  79. GRB 070420: NIR and optical afterglow confirmed
  80. GRB 070420: Swift detection of a burst with optical afterglow
  81. GRB 070419A: MITSuME Okayama Observations
  82. GRB 070419A: Early Super-LOTIS Observations
  83. GRB 070419B, Swift-BAT refined analysis
  84. GRB 070419A Swift-BAT Refined Analysis
  85. GRB 070419A: RAPTOR Detection of Early Emission
  86. GRB 070419B: Swift XRT refined analysis
  87. GRB 070419: Keck/LRIS Absorption Redshift
  88. GRB 070419B: optical afterglow confirmation
  89. GRB 070419A, Optical observations
  90. GRB 070411: Deep VLT detection
  91. GRB070419 - SDSS Pre-Burst Observations
  92. GRB 070419A: SARA observations
  93. GRB 070419A: NAYUTA Optical Observation
  94. GRB 070419A: Faulkes Telescope North Optical Observations
  95. GRB 070419B optical afterglow candidate
  96. GRB 070419A: Optical and IR observations with KANATA
  97. GRB 070419B: optical afterglow candidate
  98. GRB 070419A: Lulin Optical observation
  99. Infrared detection of GRB070419A with UKIRT
  100. GRB 070419A: Kiso Optical observation

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