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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"

42896 results found.

  1. GRB 130418A: Swift-XRT refined Analysis
  2. Swift Trigger 553930 is not an astrophysical source
  3. GRB 130418A: SMARTS optical/IR afterglow observations
  4. GRB 130418A: Submm observations from SMA
  5. GRB 130419A, Swift-BAT refined analysis
  6. GRB 130327B: Swift/XRT source is not the afterglow
  7. GRB 130419B (Swift trigger Trigger 553930): MASTER-Net optical observations
  8. Trigger 553930: Swift detection of a possible flare from HR 5110
  9. GRB 130418A: LOAO Observation
  10. GRB 130418A, Swift-BAT refined analysis
  11. GRB 130419A: Swift detection of a burst
  12. GRB130418A: VLT/X-shooter redshift confirmation
  13. GRB 130418A: RATIR Optical and NIR Observations
  14. GRB 130418A: CARMA 3mm detection
  15. GRB 130418A: GROND detection of the optical-NIR afterglow
  16. GRB130418A: OSN 1.5m fading afterglow detection
  17. GRB 130418A: Swift/UVOT Detection and request for continuing coverage
  18. GRB 130418A: Enhanced Swift-XRT position
  19. GRB 130418A: TAROT Calern and TAROT la Silla observatory optical observations
  20. GRB 130418A: TNG optical observations
  21. GRB 130418A: Redshift from 10.4m GTC
  22. GRB 130418A: Bassano Bresciano Observatory optical observations
  23. GRB 130418A: 1.23m I-band observations
  24. GRB 130418A: Swift detection of a burst with an optical counterpart
  25. GRB 130408A: Suzaku WAM observation of the prompt emission
  26. GRB 130408a: Skynet Optical Observations
  27. GRB 130408A: SMARTS optical/IR afterglow observations
  28. GRB 130408A, Swift-BAT refined analysis
  29. GRB 130408A: Zadko observatory - Gingin optical observations
  30. GRB 130407A: Swift-XRT observations
  31. GRB130408A: Swift/UVOT followup observations
  32. GRB 130408A: Swift-XRT refined Analysis
  33. Konus-Wind observation of GRB 130408A
  34. GRB 130408A: Enhanced Swift-XRT position
  35. GRB 130408A - Gemini-S/GMOS redshift determination
  36. GRB 130408A - VLT/X-shooter redshift determination
  37. GRB 130408A: GROND detection of the afterglow
  38. GRB 130408A: Swift/UVOT Detection of the Optical Afterglow
  39. GRB 130408A: Liverpool Telescope Optical candidate detection
  40. GRB 130408A: Swift detection of a burst
  41. GRB 130407A Tiled Swift observations
  42. GRB 130407A: MAXI/GSC detection
  43. GRB 130211A: Retraction of afterglow candidate
  44. GRB 130327B: Suzaku WAM observation of the prompt emission
  45. Konus-Wind observation of GRB 130320B
  46. Swift detection of IGR J18245-2452
  47. IPN Triangulation of GRB 130320B (very long/bright)
  48. Swift/XRT observation of GRB 130327B
  49. GRB 130327A: RATIR Optical/NIR afterglow confirmation
  50. GRB 130306A: Confirmation of the X-ray Afterglow
  51. GRB 130310A: RATIR Observations
  52. Swift Trigger 552142 is a noise event
  53. Konus-Wind observation of GRB 130327B
  54. GRB 130327B: Fermi-LAT detection of a burst
  55. GRB 130327B: Fermi GBM detection
  56. Swift Trigger 552142: a possible GRB
  57. GRB 130327B: gamma-ray detection by AGILE
  58. GRB 130327A: Swift-BAT refined analysis
  59. GRB 130327A: Gemini Observations
  60. GRB 130327A: Swift-XRT refined Analysis
  61. GRB 130327A: Weihai optical obsevations
  62. GRB 130327A: Swift/UVOT Upper Limits
  63. Konus-Wind observation of GRB 130325A
  64. GRB 130327A: ISON-NM optical upper limit
  65. GRB 130325A Tiled Swift observations
  66. GRB 130327A: Enhanced Swift-XRT position
  67. GRB 130327A: RATIR Optical and NIR Observations
  68. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  69. GRB 130325A: Fermi LAT detection
  70. GRB 130327A: Swift detection of a burst
  71. report: GRB 130315A: Zadko observatory - Gingin optical observations
  72. GRB 130325A: Fermi GBM detection
  73. Konus-Wind observation of GRB 130320A
  74. IPN Triangulation of GRB 130320A (long/very bright)
  75. GRB 130305A: Gemini follow-up observations
  76. GRB 130315A: GROND afterglow candidate
  77. GRB 130305A: optical upper limit in Mondy observatory
  78. GRB 130315A: Swift/UVOT Upper Limits
  79. GRB 130313A: optical upper limit in CrAO
  80. GRB 130313A: optical upper limit in Mondy observatory
  81. GRB 130315A: SALT optical observations
  82. GRB130313A: GTC early optical limits
  83. GRB 130313A: 5.8 GHz VLA upper limit
  84. GRB 130315A: Swift-XRT refined Analysis
  85. Swift XRT observations of GRB 130310A
  86. GRB 130315A, Swift-BAT refined analysis
  87. GRB 130313A: Swift/UVOT Upper Limits
  88. GRB 130305A: PTF P48 optical upper limits
  89. GRB130315A BOOTES-3 optical limit
  90. GRB 130315A: Swift detection of a burst
  91. GRB 130310A : Suzaku WAM observation of the prompt emission
  92. GRB 130305A: TLS Tautenburg observations
  93. GRB 130313A: RATIR Optical and NIR Observations
  94. GRB 130313A: TNG optical observations
  95. GRB 130313A: Fading X-ray Afterglow
  96. Swift-BAT trigger 551030 is not astrophysical
  97. GRB 130215A: Detection of the SN with the 10.4m GTC
  98. GRB130313A: Optical observations from GTC
  99. GRB 130313A: NOT optical upper limit
  100. GRB 130313A: Swift-XRT refined Analysis

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