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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"
  1. GRB 120804A: ATCA 34GHz upper limit
  2. GRB 120807A: Swift-XRT refined Analysis
  3. GRB 120802A: optical observations
  4. GRB 120807A: Fermi/LAT upper limit
  5. GRB 120807A: RAPTOR Limits During Gamma-Ray Emitting Interval
  6. GRB 120804A: Gemini-North detection of an optical afterglow and putative host galaxy
  7. GRB 120807A: TAROT La Silla observatory optical observations
  8. GRB 120807A: Swift-BAT refined analysis
  9. GRB 120807A: Enhanced Swift-XRT position
  10. GRB 120807A: Swift detection of a burst
  11. GRB 120804A: ATCA 34GHz upper limit
  12. Fermi/GBM detection of an SGR-like burst
  13. Swift-BAT trigger 530214 is noise
  14. GRB 120805A: Swift/UVOT Upper Limits
  15. Swift trigger 530214: uncertain if real or not
  16. Swift-BAT trigger 529813 is due to noise while entering the SAA
  17. GRB 120728A: Fermi GBM observation
  18. GRB 120805A: Swift-BAT refined analysis
  19. GRB 120802A: Swift/UVOT Upper Limits
  20. GRB 120805A: Swift-XRT refined Analysis
  21. GRB 120805A: 1.23m CAHA observations
  22. GRB120805A: Liverpool Telescope observations
  23. GRB 120805A: TAROT Calern observatory optical observations
  24. GRB 120805A: Swift detection of a burst
  25. GRB 120804A: EVLA Detection
  26. GRB 120804A: Gemini-North observations
  27. GRB 120804A: Swift-BAT Spectral lag analysis
  28. GRB 120804A: MITSuME Okayama Optical upper limits
  29. GRB 120803B: Swift-XRT refined Analysis
  30. GRB 120804A: Swift/UVOT Upper Limits
  31. GRB 120804A: Swift-BAT refined analysis
  32. GRB 120804A: Swift-XRT refined Analysis
  33. GRB 120804A: GROND upper limits
  34. GRB 120802A: EVLA Observations
  35. GRB 120804A: Enhanced Swift-XRT position
  36. Erratum of subject line of GCN13570 (GRB 120803A => GRB 120803B)
  37. GRB 120803B: MITSuME Okayama Optical upper limits
  38. GRB 120803A: MITSuME Okayama Optical upper limits
  39. GRB 120804A: Swift detection of a short burst
  40. GRB 120803B: Swift-BAT refined analysis
  41. GRB 120803B: Enhanced Swift-XRT position
  42. GRB 120803B: MITSuME Akeno Optical upper limits
  43. GRB 120803A: Swift-XRT Observations
  44. GRB 120803A: Swift-BAT refined analysis
  45. GRB 120803B: FTN possible afterglow candidate
  46. GRB 120803B: Swift detection of a burst
  47. GRB 120803A: Swift detection of a possible burst
  48. GRB 120802A: GRT Optical Observation
  49. GRB 120802A: Swift-XRT refined Analysis
  50. GRB 120802A Gemini-N redshift
  51. GRB 120802A: APEX/LABOCA submm observations
  52. GRB 120729A: Fermi GBM observation
  53. GRB 120802A: Swift-BAT refined analysis
  54. GRB 120802A: Enhanced Swift-XRT position
  55. GRB 120802A: MASTER optical observations
  56. GRB 120802A: optical uper limit in ISON-NM observatory
  57. GRB 120802A: Swift detection of a burst
  58. GRB 120729A: JCMT SCUBA-2 sub-mm observation
  59. GRB 120728B: Fermi GBM detection
  60. Konus-Wind observation of GRB 120728B
  61. GRB 120729A: break in the optical light curve
  62. GRB 120729A: Optical observations from OSN, BOOTES1/2 and IAC80
  63. IPN Triangulation of GRB 120728B (long/intense)
  64. GRB 120729A: RTT150 optical observations
  65. GRB 120729A: EVLA Observations
  66. Virtual Telescope observations of GRB 120729A
  67. GRB 120729A: Early RAPTOR Observations
  68. GRB 120729A: UKIRT Observation
  69. T100 observations of GRB 120729A
  70. GRB 120728A: GROND Afterglow discovery
  71. GRB 120729A: Swift-XRT refined Analysis
  72. Correction to Swift GCN Circular 13538
  73. GRB 120729A: Swift/UVOT Detection
  74. Swift Trigger 529076 is from Swift J1910.2-0546 and is not a GRB
  75. GRB 120729A: Xinglong TNT optical upper limit
  76. GRB 120729A, Swift-BAT refined analysis
  77. GRB 120728A, Swift-BAT refined analysis
  78. GRB 120729A: Enhanced Swift-XRT position
  79. GRB 120728A: Swift/UVOT Upper Limits
  80. GRB 120729A Gemini-N redshift
  81. GRB120729A - Faulkes Telescope North Optical Afterglow Candidate
  82. GRB 120729A: Swift detection of a burst with an optical afterglow
  83. GRB 120728A: Swift-XRT refined Analysis
  84. GRB 120728A: Enhanced Swift-XRT position
  85. Trigger 529076: Swift possible detection of SwJ1910.2-0546
  86. GRB 120728A: GROND observations
  87. GRB 120728A: Swift detection of a burst
  88. GRB 120727A/Galactic source: Fermi-LAT detection of a transient source
  89. GRB 120716A: optical observation in Maidanak observatory
  90. Swift Trigger 528925 is probably a noise fluctuation
  91. GRB 120722A: optical upper limit
  92. GRB 120724A: optical observation in Maidanak observatory
  93. GRB 120724A: JCMT SCUBA-2 sub-mm observation
  94. GRB 120716A: optical observation in CrAO
  95. GRB 120724A, Swift-BAT refined analysis
  96. GRB 120724A: Swift/UVOT Detection of the Optical Afterglow
  97. GRB 120724A: Enhanced Swift-XRT position
  98. GRB 120724A: Swift-XRT refined Analysis
  99. GRB120711A: Planned XMM-Newton observation
  100. GRB 120724A: Gemini-N tentative redshift

Advanced

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