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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"

27462 results found.

  1. GRB 130420B: RATIR Optical and NIR Observations
  2. GRB 130420A: Continued RATIR Optical and NIR Observations
  3. GRB 130420B: Swift-XRT refined Analysis
  4. GRB 130420A: Fermi GBM observation
  5. GRB 130420A: ISON-NM optical observations
  6. Skynet/GORT observations of GRB130420A
  7. GRB 130420B: Weihai optical upper limit
  8. GRB 130420B: Swift/UVOT Upper Limits
  9. GRB 130420A: Swift/UVOT Detection
  10. GRB 130420A: Swift-XRT refined Analysis
  11. GRB 130420B, Swift-BAT refined analysis
  12. GRB 130420A, Swift-BAT refined analysis
  13. Konus-Wind observation of GRB 130418A
  14. GRB130420A : Xinglong TNT optical upper limit
  15. GRB 130420B: Faulkes Telescope North observations
  16. GRB 130420A: Weihai Optical Observations
  17. GRB 130420B: Swift detection of a burst
  18. GRB 130420A: RATIR Optical and NIR Observations
  19. GRB 130420A: PAIRITEL NIR detections
  20. GRB 130420A: ROTSE-III Detection of Optical Counterpart
  21. GRB 130420A: Swift detection of a burst with an optical counterpart
  22. GRB 130420A: Faulkes Telescope North candidate
  23. GRB 130418A: Continued RATIR Optical and NIR Observations
  24. GRB 130418A: Swift-XRT refined Analysis
  25. Swift Trigger 553930 is not an astrophysical source
  26. GRB 130419A, Swift-BAT refined analysis
  27. GRB 130419B (Swift trigger Trigger 553930): MASTER-Net optical observations
  28. Trigger 553930: Swift detection of a possible flare from HR 5110
  29. GRB 130418A: LOAO Observation
  30. GRB 130418A, Swift-BAT refined analysis
  31. GRB 130419A: Swift detection of a burst
  32. GRB 130418A: RATIR Optical and NIR Observations
  33. GRB 130418A: GROND detection of the optical-NIR afterglow
  34. GRB 130418A: Swift/UVOT Detection and request for continuing coverage
  35. GRB 130418A: TAROT Calern and TAROT la Silla observatory optical observations
  36. GRB 130418A: Bassano Bresciano Observatory optical observations
  37. GRB 130418A: Swift detection of a burst with an optical counterpart
  38. GRB 130408a: Skynet Optical Observations
  39. GRB 130408A, Swift-BAT refined analysis
  40. GRB 130408A: Zadko observatory - Gingin optical observations
  41. GRB130408A: Swift/UVOT followup observations
  42. GRB 130408A: Swift-XRT refined Analysis
  43. Konus-Wind observation of GRB 130408A
  44. GRB 130408A - Gemini-S/GMOS redshift determination
  45. GRB 130408A - VLT/X-shooter redshift determination
  46. GRB 130408A: GROND detection of the afterglow
  47. GRB 130408A: Swift/UVOT Detection of the Optical Afterglow
  48. GRB 130408A: Liverpool Telescope Optical candidate detection
  49. GRB 130408A: Swift detection of a burst
  50. GRB 130211A: Retraction of afterglow candidate
  51. Swift detection of IGR J18245-2452
  52. IPN Triangulation of GRB 130320B (very long/bright)
  53. Swift/XRT observation of GRB 130327B
  54. GRB 130327A: RATIR Optical/NIR afterglow confirmation
  55. GRB 130306A: Confirmation of the X-ray Afterglow
  56. GRB 130310A: RATIR Observations
  57. Swift Trigger 552142 is a noise event
  58. GRB 130327B: Fermi-LAT detection of a burst
  59. GRB 130327B: Fermi GBM detection
  60. Swift Trigger 552142: a possible GRB
  61. GRB 130327A: Swift-BAT refined analysis
  62. GRB 130327A: Swift-XRT refined Analysis
  63. GRB 130327A: Swift/UVOT Upper Limits
  64. GRB 130327A: RATIR Optical and NIR Observations
  65. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  66. GRB 130325A: Fermi LAT detection
  67. GRB 130327A: Swift detection of a burst
  68. report: GRB 130315A: Zadko observatory - Gingin optical observations
  69. GRB 130325A: Fermi GBM detection
  70. GRB 130315A: GROND afterglow candidate
  71. GRB 130315A: Swift/UVOT Upper Limits
  72. GRB 130313A: optical upper limit in CrAO
  73. GRB 130313A: optical upper limit in Mondy observatory
  74. GRB 130315A: SALT optical observations
  75. GRB 130313A: 5.8 GHz VLA upper limit
  76. GRB 130315A: Swift-XRT refined Analysis
  77. GRB 130315A, Swift-BAT refined analysis
  78. GRB 130313A: Swift/UVOT Upper Limits
  79. GRB 130305A: PTF P48 optical upper limits
  80. GRB130315A BOOTES-3 optical limit
  81. GRB 130315A: Swift detection of a burst
  82. GRB 130305A: TLS Tautenburg observations
  83. GRB 130313A: RATIR Optical and NIR Observations
  84. GRB 130313A: Swift-BAT Spectral lag analysis
  85. Swift-BAT trigger 551030 is not astrophysical
  86. GRB130313A: Optical observations from GTC
  87. GRB 130313A: NOT optical upper limit
  88. GRB 130313A: Swift-XRT refined Analysis
  89. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  90. GRB 130313A: Weihai optical upper limit
  91. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  92. GRB 130313A: Swift-BAT refined analysis
  93. GRB 130313A: Zadko observatory - Gingin optical observations
  94. GRB 130313A: Swift detection of a short burst
  95. IPN Triangulation of GRB 130307A
  96. GRB 130306A: Swift Detection of a Possible Afterglow
  97. GRB 130310A: Fermi GBM detection
  98. GRB 130310A: Fermi-LAT detection and localization
  99. GRB 130131A: JCMT SCUBA-2 sub-mm observations
  100. GRB 130306A: MITSuME Ishigakijima upper limits

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