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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"

11503 results found.

  1. GRB 110530A: MASTER OT observations
  2. GRB 110530A: Swift detection of a burst with an optical afterglow
  3. Konus-Wind observation of GRB 110529A
  4. Swift J1644+57/GRB 110328A, Additional HST Observations
  5. GRB 110521A: MASTER prompt optical limit
  6. GRB 110521A: Swift-XRT refined analysis
  7. GRB 110521A: Swift detection of a burst
  8. GRB 110520A: Swift-XRT refined Analysis
  9. GRB 110520A: WHT IR observations
  10. GRB 110520A - NOT optical observation
  11. GRB 110520A: MASTER-NET optical observations
  12. GRB 110520A: Swift detection of a burst
  13. Konus-Wind observation of GRB 110518A
  14. IPN localization of bright GRB 110518A
  15. GRB 110519A: Swift detection of a burst
  16. Konus-Wind observation of GRB 110503A
  17. GRB 110422A: MASTER first 30 min OT light curve
  18. GRB 110503A: SARA-N Observations and Photometric Calibration
  19. GRB 110503A: Swift/UVOT Observations
  20. GRB 110503A: Swift-XRT refined Analysis
  21. GRB 110503A: Swift-BAT refined analysis
  22. GRB 110428A: Suzaku WAM observation of the prompt emission
  23. GRB 110422A: optical observations in CrAO
  24. Konus-Wind observation of GRB 110428A
  25. GRB 110428A: Fermi-LAT Detection
  26. GRB 110426A: MAXI/GSC detection of a GRB
  27. GRB 110422A: optical observations in CrAO
  28. Konus-Wind observation of GRB 110422A
  29. GRB 110422A: Swift-XRT refined Analysis
  30. GRB 110422A: THO optical observations
  31. GRB 110420B: Fermi GBM observation
  32. Konus-Wind observation of GRB 110420A
  33. GRB 110420B, GROND observations
  34. GRB 110420B: Swift-XRT afterglow candidate
  35. GRB 110420A: Swift-XRT refined Analysis
  36. GRB 110420A: Swift detection of a burst with optical counterpart
  37. GRB 110414A: Swift-BAT Refined Analysis
  38. GRB 110412A: Swift-BAT refined analysis
  39. GRB 110411A: Swift-XRT refined Analysis
  40. GRB 110411A: MASTER prompt and follow-up optical limits
  41. GRB 110412A: Swift detection of a burst
  42. GRB 110411A: Swift detection of a burst
  43. GRB 110407A: Swift-XRT refined Analysis
  44. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  45. GRB 110406A: Positional coincidence with NGC 404
  46. GRB 110407A: Swift detection of a burst
  47. Konus-Wind observation of GRB 110406A
  48. GRB 110328A / Swift J164449.3+573451: millimeter detection at PdBI
  49. GRB 110402A: Konus-Wind spectral lags and detailed energetics
  50. GRB 110328A/Swift J164449.3+573451: SARA-N detection
  51. Konus-Wind observation of GRB 110402A
  52. GRB 110402A: Swift-XRT refined Analysis
  53. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  54. GRB 110402A: Swift detection of a burst
  55. GRB 110328A / Swift J164449.3+573451: KASINICS NIR Observation
  56. GRB 110328A / Swift J164449.3+573451: Radio-optical/NIR Astrometry
  57. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Detection in 2nd Epoch
  58. GRB 110328B: Fermi-LAT Detection
  59. GRB 110328A/ Swift J164449.3+573451 : Xinglong TNT Upper limit
  60. GRB 110328A: Swift detection of a burst
  61. GRB 110319B BAT refined analysis
  62. GRB 110319B: GROND upper limits
  63. GRB 110319B found in ground analysis of Swift-BAT data
  64. GRB 110319A: Swift-XRT refined Analysis
  65. GRB 110319A: Swift detection of a burst
  66. GRB 110318A: Swift detection of a burst
  67. GRB 110315A: Swift detection of a burst
  68. GRB 110312A: RTT150 optical observations
  69. GRB 110312A: Swift-XRT refined Analysis
  70. GRB 110312A: Swift detection of a burst
  71. GRB 110223A : early optical limit by "Pi of the Sky"
  72. GRB 110223A: Liverpool Telescope observations
  73. GRB 110223A: Swift-XRT refined Analysis
  74. GRB 110223B: Swift-BAT refined analysis
  75. GRB 110223A: Swift detection of a burst
  76. OT 110215: Further NIR observations from NOT of the GRB candidate
  77. Swift XRT and UVOT Observations of OT 110215
  78. OT 110215: NIR observations from NOT of GRB candidate
  79. GRB 110213A: optical observations in CrAO
  80. OT 110215: possible GRB from 2MASS J00264184+8324093
  81. GRB 110213B: Gemini South Redshift
  82. GRB 110213A: YNAO-GMG Observations
  83. Konus-Wind observation of GRB 110213A
  84. Konus-Wind observation of GRB 110213B
  85. GRB 110213B: MAXI/GSC refined analysis
  86. GRB 110213B: MAXI/GSC detection of a probable GRB
  87. GRB 110213A: GRAS011 optical observations
  88. GRB 110212A: GRT Optical Observation
  89. GRB 110212A: SARA-N Optical Limits
  90. GRB 110201A: Subaru/MOIRCS Ks-band photometry
  91. GRB 110210A: Swift-XRT refined Analysis
  92. GRB 110210A: Swift detection of a burst
  93. GRB 110208A: Potential afterglow from Magellan
  94. GRB 110208A: Swift-XRT refined Analysis
  95. GRB 110208A: Swift-BAT refined analysis
  96. GRB 110208A: Swift detection of a burst
  97. GRB 110205A: optical observations in Mondy observatory
  98. GRB 110205A : HCT optical observations
  99. GRB 110207A: Swift-BAT refined analysis
  100. Konus-Wind observation of GRB 110205A

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