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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"

21799 results found.

  1. GRB 130418A: SMARTS optical/IR afterglow observations
  2. GRB 130418A: Submm observations from SMA
  3. GRB 130419A, Swift-BAT refined analysis
  4. GRB 130327B: Swift/XRT source is not the afterglow
  5. GRB 130419B (Swift trigger Trigger 553930): MASTER-Net optical observations
  6. Trigger 553930: Swift detection of a possible flare from HR 5110
  7. GRB 130418A: LOAO Observation
  8. GRB 130418A, Swift-BAT refined analysis
  9. GRB 130418A: REM NIR observations
  10. GRB 130418A: RATIR Optical and NIR Observations
  11. GRB 130418A: GROND detection of the optical-NIR afterglow
  12. GRB130418A: OSN 1.5m fading afterglow detection
  13. GRB 130418A: Swift/UVOT Detection and request for continuing coverage
  14. GRB 130418A: Enhanced Swift-XRT position
  15. GRB 130418A: TAROT Calern and TAROT la Silla observatory optical observations
  16. GRB 130418A: TNG optical observations
  17. GRB 130418A: Bassano Bresciano Observatory optical observations
  18. GRB 130418A: 1.23m I-band observations
  19. GRB 130418A: Swift detection of a burst with an optical counterpart
  20. GRB 130408A: Suzaku WAM observation of the prompt emission
  21. GRB 130408a: Skynet Optical Observations
  22. GRB 130408A: SMARTS optical/IR afterglow observations
  23. GRB 130408A, Swift-BAT refined analysis
  24. GRB 130408A: Zadko observatory - Gingin optical observations
  25. GRB130408A: Swift/UVOT followup observations
  26. Konus-Wind observation of GRB 130408A
  27. GRB 130408A: Enhanced Swift-XRT position
  28. GRB 130408A: GROND detection of the afterglow
  29. GRB 130408A: Swift detection of a burst
  30. GRB 130211A: Retraction of afterglow candidate
  31. GRB 130327B: Suzaku WAM observation of the prompt emission
  32. Konus-Wind observation of GRB 130320B
  33. Swift detection of IGR J18245-2452
  34. IPN Triangulation of GRB 130320B (very long/bright)
  35. GRB 130327A: RATIR Optical/NIR afterglow confirmation
  36. GRB 130306A: Confirmation of the X-ray Afterglow
  37. GRB 130310A: RATIR Observations
  38. Swift Trigger 552142 is a noise event
  39. Konus-Wind observation of GRB 130327B
  40. GRB 130327B: Fermi-LAT detection of a burst
  41. Swift Trigger 552142: a possible GRB
  42. GRB 130327B: gamma-ray detection by AGILE
  43. GRB 130327A: Swift-BAT refined analysis
  44. GRB 130327A: Gemini Observations
  45. GRB 130327A: Weihai optical obsevations
  46. GRB 130327A: Swift/UVOT Upper Limits
  47. GRB 130327A: ISON-NM optical upper limit
  48. GRB 130327A: Enhanced Swift-XRT position
  49. GRB 130327A: RATIR Optical and NIR Observations
  50. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  51. GRB 130325A: Fermi LAT detection
  52. GRB 130327A: Swift detection of a burst
  53. report: GRB 130315A: Zadko observatory - Gingin optical observations
  54. Konus-Wind observation of GRB 130320A
  55. IPN Triangulation of GRB 130320A (long/very bright)
  56. GRB 130305A: Gemini follow-up observations
  57. GRB 130315A: GROND afterglow candidate
  58. GRB 130315A: Swift/UVOT Upper Limits
  59. GRB 130313A: optical upper limit in CrAO
  60. GRB 130313A: optical upper limit in Mondy observatory
  61. GRB 130315A: SALT optical observations
  62. GRB130313A: GTC early optical limits
  63. Swift XRT observations of GRB 130310A
  64. GRB 130315A, Swift-BAT refined analysis
  65. GRB 130313A: Swift/UVOT Upper Limits
  66. GRB 130305A: PTF P48 optical upper limits
  67. GRB130315A BOOTES-3 optical limit
  68. GRB 130315A: Swift detection of a burst
  69. GRB 130310A : Suzaku WAM observation of the prompt emission
  70. GRB 130305A: TLS Tautenburg observations
  71. GRB 130313A: RATIR Optical and NIR Observations
  72. GRB 130313A: TNG optical observations
  73. GRB130313A: Optical observations from GTC
  74. GRB 130313A: NOT optical upper limit
  75. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  76. GRB 130313A: Weihai optical upper limit
  77. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  78. GRB 130313A: Zadko observatory - Gingin optical observations
  79. GRB 130313A: MASTER-Net optical observations
  80. GRB 130313A: Swift detection of a short burst
  81. IPN Triangulation of GRB 130307A
  82. GRB 100424A: Keck host detection and VLT/X-shooter redshift
  83. GRB 130310A: optical observations
  84. GRB 130306A: Swift Detection of a Possible Afterglow
  85. GRB 130131B: host detection and redshift
  86. Konus-Wind observation of GRB 130310A
  87. GRB 130310A: Fermi GBM detection
  88. GRB 130310A: Fermi-LAT detection and localization
  89. GRB 130306A: MITSuME Ishigakijima upper limits
  90. GRB 130305A BAT refined circular
  91. Konus-Wind observation of GRB 130306A
  92. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  93. GRB 130305A: Gemini-North upper limit
  94. GRB 130306A: MASTER-Net pre-Swift alert observation
  95. GRB 130305A: Swift/UVOT Upper Limit
  96. GRB 130305A: RATIR Observations
  97. GRB 100615A: HST host detection and X-shooter redshift
  98. Konus-Wind observation of GRB 130305A
  99. GRB 130305A: Fermi GBM observation
  100. GRB 130305A: Fermi LAT Detection

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