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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

45716 results found.

  1. GRB 110422A: Swift detection of a burst
  2. GRB 110328A/Swift J164449.3+573451: Maidanak Optical Observation
  3. GRB 110420B: Swift/UVOT Upper Limits
  4. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  5. GRB 110420B: Swift-XRT afterglow candidate retraction
  6. GRB 110420B: Fermi GBM observation
  7. Konus-Wind observation of GRB 110420A
  8. GRB 110420B: Spectral lag indicates short hard burst
  9. GRB 110420B, GROND observations
  10. GRB 110420A Swift/UVOT Observations
  11. GRB 110420B: Swift-XRT afterglow candidate
  12. GRB 110420B: Swift-BAT refined analysis
  13. GRB 110420A: Swift-BAT refined analysis
  14. GRB 110420B: Swift detection of a short hard burst
  15. GRB 110420A: Swift-XRT refined Analysis
  16. GRB 110420A: Enhanced Swift-XRT position
  17. GRB 110420A: Swift detection of a burst with optical counterpart
  18. GRB110414A: MITSuME Ishigakijima Optical upper limits
  19. GRB 110414A: GROND upper limits
  20. GRB110414A: MITSuME Okayama Optical upper limits
  21. GRB 110414A: Swift-BAT Refined Analysis
  22. GRB 110414A: Swift/UVOT Upper limits
  23. GRB 110414A: Swift-XRT refined Analysis
  24. GRB 110414A: Enhanced Swift-XRT position
  25. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  26. GRB 110414A : Faulkes Telescope North observations
  27. GRB 110414A: Swift detection of a burst
  28. GRB 110411A: PAIRITEL NIR Upper Limits
  29. GRB 110412A: Swift-BAT refined analysis
  30. GRB 110411A: optical limits from OSN
  31. GRB 110411A: Swift-XRT refined Analysis
  32. GRB 110412A: Fermi GBM observation
  33. GRB 110411A: Swift/UVOT Upper Limits
  34. GRB 110411A: MASTER prompt and follow-up optical limits
  35. GRB 110411A : Xinglong TNT OT candidate
  36. GRB 110412A: Swift detection of a burst
  37. GRB 110411A, Swift-BAT refined analysis
  38. GRB 110411A: Enhanced Swift-XRT position
  39. GRB 110411A: MASTER optical observations
  40. GRB 110411A: Swift detection of a burst
  41. GRB 110328A / Swift J164449.3+573451: R-band Monitoring
  42. GRB 110407A: Swift-XRT refined Analysis
  43. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  44. GRB 110407A:VLF observations on 20.27kHz
  45. GRB 110328A / Swift J164449.3+573451: optical observations
  46. GRB 110407A: SMARTS optical limit
  47. GRB 110328A / Swift J164449.3+573451: VLBA Observations
  48. GRB 110328A/Swift J164449.3+573451 UVOT Upper Limits
  49. GRB 110406A: Positional coincidence with NGC 404
  50. GRB 110407A: MASTER optical observations
  51. GRB110407A: UVOT Upper Limits
  52. GRB 110407A: GROND Detection of the Optical Afterglow
  53. GRB 110407A: MITSuME Okayama and Ishigakijima Optical upper limits
  54. GRB 110407A: NOT optical observations
  55. GRB 110407A: Enhanced Swift-XRT position
  56. GRB 110407A: Swift-BAT refined analysis
  57. GRB 100407A : Errata of afterglow position in GCN 11899
  58. IPN triangulation of the bright GRB110406A
  59. GRB 110407A : Lulin optical afterglow detection
  60. GRB 110407A : Xinglong TNT upper limit
  61. GRB 110407A: MASTER early optical observations
  62. GRB 110407A: Prompt enhanced Swift-XRT position
  63. GRB 110407A: Swift detection of a burst
  64. Konus-Wind observation of GRB 110406A
  65. Redshift of GRB 110402A theoretically estimated (revised)
  66. GRB 110328A/Swift J164449.3+573451: BAT recent rate increase and pre-outburst,light curve
  67. GRB 110406A: An exceptionally bright burst detected by INTEGRAL SPI-ACS
  68. GRB 110402A: fading optical afterglow
  69. Redshift of GRB 110402A theoretically estimated
  70. GRB 110402A: Suzaku WAM observation of the prompt emission
  71. GRB 110328/Swift J164449.3+573451: Chandra observations
  72. GRB 110402A: LOAO Optical Observation
  73. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  74. Comparison of ICSP VLF observation of GRB 090424 with satellite observations
  75. GRB 110328A / Swift J164449.3+573451: Keck LRIS R-band photometry
  76. GRB 110328A / Swift J164449.3+573451, HST Observations
  77. GRB 110328A / Swift J164449.3+573451: millimeter detection at PdBI
  78. GRB 110402A: Konus-Wind spectral lags and detailed energetics
  79. GRB 110401A: Fermi GBM detection
  80. GRB 110402A: Fermi GBM detection
  81. GRB 110402A: optical observations in Mondy
  82. GRB 110402A afterglow observation
  83. GRB 110328A / Swift J164449.3+573451: Keck/DEIMOS Optical Spectroscopy
  84. GRB 110402A: MITSuME Okayama and Ishigakijima Optical upper limits
  85. GRB 110328A/Swift J164449.3+573451: SARA-N detection
  86. GRB 110402A: Swift/UVOT detection of afterglow candidate
  87. GRB 110402A: Spectral lag indicates short hard burst
  88. Konus-Wind observation of GRB 110402A
  89. GRB 110402A: Konkoly observations
  90. GRB 110328A: Konkoly observations.
  91. GRB 110402A: Swift-BAT refined analysis
  92. GRB 110402A: Swift-XRT refined Analysis
  93. GRB 110402A: early optical limit by "Pi of the Sky"
  94. GRB 110402A: further NOT observations
  95. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  96. GRB 110402A: PAIRITEL NIR Upper Limits
  97. GRB 110402A: Enhanced Swift-XRT position
  98. GRB 110402A: NOT afterglow confirmation
  99. GRB 110402A: Liverpool Telescope Observations
  100. GRB 110402A: Swift detection of a burst

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