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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"

42904 results found.

  1. GRB 130513A: GROND observations
  2. GRB 130514B: a long GRB detected by INTEGRAL
  3. GRB 130514A: Enhanced Swift-XRT position
  4. GRB 130514A: Swift-BAT refined analysis
  5. GRB 130513A: Swift-XRT detection of the afterglow.
  6. GRB 130514A: GROND optical-NIR afterglow discovery and photo-z
  7. GRB 130514A: P60 Observations
  8. GRB 130514A: Swift detection of a burst
  9. GRB 130427A: Tautenburg 2nd epoch: No break, no clear SN
  10. GRB 130513A: a long GRB detected by INTEGRAL
  11. GRB130508A: MASTER-Net optical observations
  12. GRB130511A: SOAO Optical Observation
  13. GRB 130511A: Swift-XRT refined Analysis
  14. GRB 130511A: Kanata/HOWPol optical observation
  15. GRB 130511A, Swift-BAT refined analysis
  16. GRB 130511A: Upper limit by Xinglong TNT optical observation
  17. GRB 130511A: Enhanced Swift-XRT position
  18. GRB 130511A: Gemini-North Redshift
  19. GRB 130511A: Swift detection of a burst with an optical counterpart
  20. GRB 130427A: host galaxy observations
  21. GRB 130508A: RATIR Optical and NIR Observations
  22. GRB 130427A: Keck/LRIS Observations
  23. GRB 130508A: Refined Swift-XRT analysis: Correction to GCN 14612
  24. GRB 130508A, Swift-BAT refined analysis
  25. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  26. GRB130508A: BOOTES-3 optical limit
  27. GRB 130427A: Ten nights of Skynet/PROMPT/GORT observations
  28. GRB 130508A: Swift detection of a probable burst
  29. GRB 130427A: Continued RATIR Optical and NIR Observations
  30. GRB 130427A, LBT optical spectrum
  31. GRB 130505B: Further Swift observations
  32. GRB 130504C: Swift-XRT afterglow confirmation
  33. GRB 130504C: Suzaku WAM observation of the prompt emission
  34. GRB 130504B: Suzaku WAM observation of the prompt emission
  35. GRB 130505A: Suzaku WAM observation of the prompt emission
  36. GRB 130427A, Watcher afterglow detection
  37. GRB 130427A: Excess optical emission consistent with an emerging supernova
  38. GRB 130427A: Amateur observations from Sweden
  39. GRB 130505A: RATIR Optical and NIR Observations
  40. GRB 130505B: Swift Candidate Afterglow
  41. GRB 130505A: Tautenburg afterglow observations
  42. GRB 130427A: Tautenburg afterglow observations
  43. Refined IPN Triangulation of GRB 130502B
  44. GRB 130427A: RHESSI observations
  45. GRB 130505A, Swift-BAT refined analysis
  46. GRB 130504C: further Swift-XRT observations
  47. Konus-Wind observation of GRB 130504C
  48. GRB 130505B: MAXI/GSC detection
  49. GRB 130505A: optical observations
  50. GRB 130504C: Swift-XRT observations
  51. GRB 130504C: Fermi GBM detection
  52. GRB 130427A: optical observations in CrAO
  53. GRB 130502A: optical upper limit
  54. GRB 130505A: E_iso record retraction
  55. GRB 130427A: correction to GCN 14487
  56. GRB 130505A: correction to GCN 14575
  57. GRB 130505A: Swift-XRT refined Analysis
  58. GRB 130505A: Largest E_iso ever measured
  59. Konus-Wind observation of GRB 130505A
  60. GRB 130504C: Fermi-LAT detection of a burst
  61. Swift/UVOT observations of GRB130505A
  62. GRB 130505A: Xinglong TNT optical observations
  63. GRB 130505A; Weihai optical observations
  64. GRB 130505A: Enhanced Swift-XRT position
  65. GRB 130505A - Gemini-N/GMOS redshift determination
  66. GRB 130505A: MAXI/GSC detection
  67. Konus-Wind observation of GRB 130504B
  68. GRB 130504A: IAC80 optical candidate
  69. GRB 130505A: Swift detection of a burst with optical afterglow
  70. IPN Triangulation of GRB 130504B
  71. GRB 130504B: Fermi GBM detection
  72. GRB 130504A: Bassano Bresciano Observatory optical upper limit
  73. GRB 130504A: Enhanced XRT position
  74. GRB 130502B: Suzaku WAM observation of the prompt emission
  75. GRB 130504A: Swift/UVOT Upper Limits
  76. GRB 130502B: Swift-XRT refined Analysis
  77. GRB 130504A, Swift-BAT refined analysis
  78. Swift-XRT X-ray afterglow candidate for GRB 130504A (BAT trigger 555096)
  79. GRB 130502B: possible TNG counterpart
  80. Trigger 555096: Swift detection of a possible burst
  81. GRB 130502A: Swift-BAT refined analysis
  82. GRB 130427A: Non-observation of VHE emission with HAWC
  83. GRB130502A: MASTER-Net optical observations
  84. GRB 130502A: Swift-XRT refined Analysis
  85. IPN Triangulation of GRB 130502B
  86. GRB 130502A: Fermi GBM detection
  87. GRB 130502B: Swift/UVOT Upper Limits
  88. GRB 130502A: Swift/UVOT Upper Limits
  89. Konus-Wind observation of GRB 130502B
  90. GRB 130502B: P60 Observations
  91. GRB 130502B Swift-XRT observations
  92. GRB 130502A: RATIR Optical and NIR Observations
  93. GRB 130427A: Pan-STARRS 1 optical observations
  94. GRB 130418A: TNG NIR observations
  95. GRB 130502A: Enhanced Swift-XRT position
  96. GRB 130502A: OSN and IAC80 I-band observations
  97. GRB 130502A: z-band observations from GTC
  98. GRB 130502B: Fermi LAT Detection
  99. GRB 130502A: TNG candidate counterpart
  100. GRB 130502B: Fermi GBM detection of a burst

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