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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"

16157 results found.

  1. GRB 100518A: Swift/UVOT Upper Limits
  2. GRB 100518A: optical afterglow decay
  3. GRB 100518A: BOOTES-3 optical observations
  4. GRB 100513A: MITSuME Akeno Optical Observation
  5. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  6. GRB 100514A: optical afterglow confirmation
  7. GRB 100514A: Swift/UVOT Observations
  8. GRB 100514A: YNAO-GMG observations
  9. GRB 100514A: MASTER-Net optical observations
  10. GRB 100514A: Faulkes Telescope South observations
  11. GRB 100513A, RIMOTS optical upper limits
  12. GRB 100513A: Gemini/GMOS Spectroscopic Redshift
  13. GRB 100513A: PAIRITEL continued observations and confirmation of fading
  14. GRB100504A: Optical upper limits at IAO
  15. GRB 100511A, RIMOTS optical upper limits
  16. GRB100508A: Further Swift/UVOT Observations
  17. GRB 100508A: GROND Detection of the optical afterglow
  18. GRB 100508A: ROTSE-III Optical Limits
  19. GRB 100418A: RTT150 optical observations
  20. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  21. GRB 100418A: Flattening of the Swift/UVOT Optical Light Curve
  22. GRB 100423A: xinglong TNT optical upper limit
  23. GRB 100420A: Terskol optical upper limit
  24. GRB 100418A: RTT150 optical observations
  25. GRB 100414A : EVLA Radio Detection
  26. GRB 100414A : WSRT Radio Detection
  27. GRB 100423A: CrAO optical observations
  28. GRB 100418A: Terskol optical observations
  29. GRB 100424A: CrAO optical observations
  30. GRB 100424A: Swift/UVOT Upper Limits
  31. GRB 100425A: VLT/X-shooter redshift
  32. GRB 100425A: GROND afterglow observation
  33. GRB 100424A: D50 optical limits
  34. GRB 100425A: candidate optical afterglow from the VLT
  35. GRB100424A: MITSuME optical upper limits
  36. GRB100423A: MITSuME optical upper limits
  37. GRB 100424A: GROND Upper Limits
  38. GRB 100424A: NOT optical observations
  39. GRB 100420A: GRT Optical Observation
  40. GRB 100418A: ROVOR optical measurements at 35 hours
  41. Swift Trigger 420256: D50 optical limits
  42. Swift Trigger 420256: ROTSE-III Optical Limits
  43. Radio afterglow detection of GRB 100418A with the EVLA
  44. GRB 100418A: Continued PAIRITEL NIR Observations
  45. GRB 100418A: WSRT Radio Detection
  46. GRB100418A: REM possible afterglow detection
  47. GRB 100418A: Continuing Swift/UVOT Observations
  48. GRB 100418A: RTT150 optical observations
  49. GRB100420A: MITSuME optical upper limits
  50. GRB 100414A: CFHT optical observations
  51. GRB 100420A: Swift/UVOT Upper Limits
  52. GRB 100418A: RTT150 observations during the optical afterglow maximum
  53. GRB 100418A: optical observations
  54. GRB 100418A: MASTER-Net optical observations
  55. GRB 100418A: VLT optical observations
  56. GRB 100420A: ROTSE-III Optical Limits
  57. GRB 100418A PAIRITEL NIR Observations
  58. GRB 100418A: ROVOR optical afterglow detection
  59. GRB 100418A: host galaxy detection in the SDSS
  60. GRB100414A: SAO RAS optical observations
  61. GRB 100418A: ROTSE-III Optical Limits
  62. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  63. GRB 100413A: Radio Afterglow Detection with the EVLA
  64. GRB 100414A: Gemini-N observation (correction)
  65. GRB 100414A: GROND Detection of the Optical Afterglow
  66. GRB 100413A: GROND Upper limits
  67. GRB 100413A: Swift/UVOT Upper Limits
  68. GRB 100413: xinglong TNT optical upper limit
  69. GRB 100413A: MASTER-Net optical observations
  70. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  71. MASTER observations on the Swift second trigger on LS V +44 17
  72. GRB 100331B: GROND Upper limits
  73. Master-Net observations on the Swift trigger on LS V +44 17
  74. GRB 100401A: Swift/UVOT Upper Limit
  75. GRB 100316A: R-band limit
  76. GRB 100331B: Swift/UVOT Upper Limits
  77. GROND observations of GRB100316D/SN2010bh
  78. Emerging Supernova in the Afterglow of GRB 100316D
  79. SGR 1833-0832: Swift/UVOT Upper Limits
  80. GRB 100319A: correction to GCN 10527
  81. GRB 100219A: MASTER-Net optical alert observations
  82. GRB 100316D: Pre-burst emission measured by BAT
  83. GRB 100219A: optical upper limit
  84. GRB 100316A: optical observations in CrAO
  85. GRB 100316D: Swift XRT enhanced position and further refined analysis
  86. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  87. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  88. GRB 100316B: Swift/UVOT observations
  89. GRB 100316A: TAROT Calern observatory optical observations
  90. GRB 100316B: VLT/X-shooter redshift
  91. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  92. GRB 100316B: Swift detection of a burst with optical counterpart
  93. GRB 100316 optical candidate from 1.23m CAHA telescope
  94. GRB 100316 optical candidate from 1.23m CAHA telescope
  95. GRB100305A: Optical upper limits at IAO
  96. GRB 100305A: Gemini z'-band observation
  97. GRB 100305A Optical Observations
  98. GRB 100305A: P60 Observations
  99. GRB 100302A: Swift/UVOT Upper Limits
  100. GRB 100302A: Optical observations at Crni Vrh

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