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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"

3031 results found.

  1. Konus-Wind observation of GRB 110618A
  2. IPN triangulation of GRB110618A (long duration, extremely intense)
  3. GRB 110610A: Suzaku WAM observation of the prompt emission
  4. GRB 110521A: Swift detection of a burst
  5. GRB 110422A: Update of Herschel FIR observation schedule
  6. GRB 110428A : Swift-XRT observations
  7. GRB 110428A: Fermi-LAT Detection
  8. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  9. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  10. GRB 110328A / Swift J164449.3+573451: X-ray analysis and a mini-blazar analogy
  11. GRB 110328A / Swift J164449.3+573451: NOT optical observations.
  12. GRB 110319A: Swift-XRT refined Analysis
  13. GRB 110305A: Swift detection of a burst
  14. GRB 110223A: Liverpool Telescope observations
  15. OT 110215: possible GRB from 2MASS J00264184+8324093
  16. GRB 110213B: Possible Host Galaxy in SDSS Stripe 82 Imaging
  17. GRB 110213B: P60 Optical Afterglow Candidate
  18. GRB 110212A: Swift XRT and UVOT observations
  19. GRB 110213B: Swift XRT observation
  20. GRB 110213B: MAXI/GSC refined analysis
  21. GRB 110213B: MAXI/GSC detection of a probable GRB
  22. GRB 110210A: Swift detection of a burst
  23. GRB 110207A: Swift-BAT refined analysis
  24. GRB 110205A: Possible Lick/Kast redshift
  25. GRB 110128A: Swift detection of a burst
  26. GRB 101225A: CQUEAN optical observation
  27. GRB 110107A: Swift-XRT afterglow confirmation
  28. Short GRB 110106A: MASTER OT observations
  29. GRB 110106B: Gemini-North / WHT detection of a fading afterglow
  30. GRB 110106B: WHT candidate afterglow
  31. GRB101224A: MITSuME Okayama optical upper limits
  32. IPN triangulation of bright GRB 101123A
  33. GGRB 101023A: GROND detection of the optical-NIR afterglow
  34. GRB 101017A: Swift detection of a burst with optical counterpart
  35. Konus-Wind observation of GRB 101014A
  36. GRB 101014A: Fermi GBM detection
  37. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  38. GRB 100915A: TAROT Calern observatory optical observations
  39. GRB 100901A: TLS observations, SDSS calibration, decay slope
  40. Konus-Wind observation of GRB 100829A
  41. GRB 100901A: optical observation at Mt.Terskol
  42. GRB 100901A: optical observation at Mt.Terskol
  43. GRB 100901A: MASTER Optical Early Limits
  44. GRB 100823A: optical observations
  45. GRB 100807A: P200 Infrared Observations
  46. GRB 100807A: P60 Optical Afterglow Discovery
  47. GRB 100805A: Swift detection of a burst with an optical counterpart
  48. GRB 100802A: NOT optical observation
  49. GRB 100802A: ROTSE-III Optical Limits
  50. GRB 100802A: Possible Swift/UVOT Detection of Optical Afterglow
  51. GRB 100727A: Swift/UVOT Upper Limits
  52. GRB 100718A: MASTER-Net optical prompt and alert observations
  53. GRB 100702A: Swift detection of a short burst
  54. Swift-BAT trigger 426048 is not a burst
  55. GRB 100513A: CrAO optical observations
  56. GRB 100526A: NOT optical upper limit
  57. GRB 100510A: MAXI/GSC detection
  58. GRB 100418A: Terskol optical observations
  59. GRB 100425A: Swift detection of a burst
  60. Swift Trigger 420256: ROTSE-III Optical Limits
  61. GRB 100420A: Swift detection of a burst
  62. GRB 100316C: BOOTES-3 observations
  63. GRB 100316D: Swift detection of a burst
  64. GRB 100316A: Enhanced Swift-XRT position
  65. GRB 100316B: Swift detection of a burst with optical counterpart
  66. GRB 100316A: Swift-XRT detection
  67. GRB100219A Akeno and Okayama MITSuME Optical Observation
  68. GRB 100203A Detected in Ground Analysis of BAT Data
  69. GRB 100122A: Fermi GBM detection
  70. Konus-Wind observation of GRB 091208A
  71. GRB 091208B, RIMOTS optical upper limits
  72. Short X-ray Transient Detection by MAXI/GSC
  73. GRB 091130: MASTER observations
  74. GRB 091120: MAXI GSC detection
  75. GRB 091117A: Swift/UVOT followup observations
  76. GRB 091024: optical observations
  77. GRB 091018: GROND observations
  78. GRB 091010 optical upper limits
  79. GRB090829: Fermi GBM Detection
  80. GRB 090817: aphotometry of USNO-B1.0 341-0096763
  81. GRB 090813: P60 Optical Afterglow Confirmation
  82. Swift trigger 358760 is probably a noise event
  83. GRB 090728: Swift detection of a burst
  84. IPN Triangulation of bright GRB 090720B
  85. GRB 090715B: VLA radio detection
  86. GRB 090717: Fermi GBM detection
  87. GRB090709A : WSRT Radio observation
  88. GRB 090704: Fermi GBM observation
  89. GRB 090704: a long GRB found in INTEGRAL off-line analysis
  90. GRB 090706: Fermi GBM detection
  91. GRB 090621B: GRT Optical Observation
  92. GRB 090618 : WSRT radio detection
  93. VLA radio detection of GRB 090618
  94. GRB 090424: WSRT Radio Observations
  95. GRB 090607: Swift detection of a burst
  96. GRB 090529C: Fermi GBM detection
  97. GRB 090529: MITSuME optical observation
  98. GRB 090531B: ROTSE-III Optical Limits
  99. GRB 090531: GROND upper limits
  100. GRB 090531: P60 Observations

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