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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"

42627 results found.

  1. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  2. GRB 110426A: MAXI/GSC detection of a GRB
  3. GRB 110422A: optical observations in CrAO, second epoch
  4. GRB 110422A: Redshift confirmation from GTC
  5. GRB 110422A: tentative redshift from TNG
  6. GRB 110422A: Suzaku WAM observation of the prompt emission
  7. GRB 110422A: Herschel observation scheduled
  8. GRB110422A: NOT optical follow-ups
  9. GRB 110422A: optical observations in CrAO
  10. Konus-Wind observation of GRB 110422A
  11. GRB 110422A: Further NOT observation
  12. GRB 110422A: Swift/UVOT Detection of optical afterglow
  13. GRB 110422A: Swift-XRT refined Analysis
  14. GRB 110422A: CQUEAN griz Observation
  15. GRB 110422A: THO optical observations
  16. GRB 110422A: Enhanced Swift-XRT position
  17. GRB 110422A: correction to the GCN circ. 11958
  18. GRB 110422A: TNG optical observations
  19. GRB 110422A: SAO RAS optical observations
  20. GRB 110422A: NOT optical observation
  21. GRB 110422A: MASTER earlier OT polarization observations
  22. GRB 110422A: Swift-BAT refined analysis
  23. GRB 110422A: Mondy optical observations
  24. GRB 110422A: Swift detection of a burst
  25. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  26. GRB 110420B: Fermi GBM observation
  27. Konus-Wind observation of GRB 110420A
  28. GRB 110420B: Spectral lag indicates short hard burst
  29. GRB 110420B, GROND observations
  30. GRB 110420A Swift/UVOT Observations
  31. GRB 110420B: Swift-XRT afterglow candidate
  32. GRB 110420B: Swift-BAT refined analysis
  33. GRB 110420A: Swift-BAT refined analysis
  34. GRB 110420B: Swift detection of a short hard burst
  35. GRB 110420A: Swift-XRT refined Analysis
  36. GRB 110420A: Enhanced Swift-XRT position
  37. GRB 110420A: Swift detection of a burst with optical counterpart
  38. GRB 110414A: GROND upper limits
  39. GRB 110414A: Swift-BAT Refined Analysis
  40. GRB 110414A: Swift-XRT refined Analysis
  41. GRB 110414A: Enhanced Swift-XRT position
  42. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  43. GRB 110414A : Faulkes Telescope North observations
  44. GRB 110414A: Swift detection of a burst
  45. GRB 110411A: PAIRITEL NIR Upper Limits
  46. GRB 110412A: Swift-BAT refined analysis
  47. GRB 110411A: optical limits from OSN
  48. GRB 110411A: Swift-XRT refined Analysis
  49. GRB 110412A: Fermi GBM observation
  50. GRB 110411A: MASTER prompt and follow-up optical limits
  51. GRB 110411A : Xinglong TNT OT candidate
  52. GRB 110412A: Swift detection of a burst
  53. GRB 110411A, Swift-BAT refined analysis
  54. GRB 110411A: Enhanced Swift-XRT position
  55. GRB 110411A: MASTER optical observations
  56. GRB 110411A: Swift detection of a burst
  57. GRB 110407A: Swift-XRT refined Analysis
  58. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  59. GRB 110407A:VLF observations on 20.27kHz
  60. GRB 110328A / Swift J164449.3+573451: optical observations
  61. GRB 110407A: SMARTS optical limit
  62. GRB 110328A / Swift J164449.3+573451: VLBA Observations
  63. GRB 110328A/Swift J164449.3+573451 UVOT Upper Limits
  64. GRB 110406A: Positional coincidence with NGC 404
  65. GRB 110407A: MASTER optical observations
  66. GRB110407A: UVOT Upper Limits
  67. GRB 110407A: GROND Detection of the Optical Afterglow
  68. GRB 110407A: NOT optical observations
  69. GRB 110407A: Enhanced Swift-XRT position
  70. GRB 110407A: Swift-BAT refined analysis
  71. GRB 100407A : Errata of afterglow position in GCN 11899
  72. IPN triangulation of the bright GRB110406A
  73. GRB 110407A : Lulin optical afterglow detection
  74. GRB 110407A : Xinglong TNT upper limit
  75. GRB 110407A: MASTER early optical observations
  76. GRB 110407A: Prompt enhanced Swift-XRT position
  77. GRB 110407A: Swift detection of a burst
  78. Konus-Wind observation of GRB 110406A
  79. Redshift of GRB 110402A theoretically estimated (revised)
  80. GRB 110328A/Swift J164449.3+573451: BAT recent rate increase and pre-outburst,light curve
  81. GRB 110406A: An exceptionally bright burst detected by INTEGRAL SPI-ACS
  82. GRB 110402A: fading optical afterglow
  83. Redshift of GRB 110402A theoretically estimated
  84. GRB 110402A: Suzaku WAM observation of the prompt emission
  85. GRB 110328/Swift J164449.3+573451: Chandra observations
  86. GRB 110402A: LOAO Optical Observation
  87. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  88. GRB 110328A / Swift J164449.3+573451, HST Observations
  89. GRB 110328A / Swift J164449.3+573451: millimeter detection at PdBI
  90. GRB 110401A: Fermi GBM detection
  91. GRB 110402A: Fermi GBM detection
  92. GRB 110402A: optical observations in Mondy
  93. GRB 110402A afterglow observation
  94. GRB 110328A / Swift J164449.3+573451: Keck/DEIMOS Optical Spectroscopy
  95. GRB 110328A/Swift J164449.3+573451: SARA-N detection
  96. GRB 110402A: Swift/UVOT detection of afterglow candidate
  97. GRB 110402A: Spectral lag indicates short hard burst
  98. Konus-Wind observation of GRB 110402A
  99. GRB 110402A: Konkoly observations
  100. GRB 110328A: Konkoly observations.

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