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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"

20514 results found.

  1. GRB 100614A: Liverpool Telescope Observations
  2. GRB 100614A: Swift detection of a burst
  3. GRB 100606A: GROND observations
  4. Radio detection of GRB100418a with ATCA
  5. GRB 100606A: Gemini-South imaging
  6. GRB 100606A: Swift/UVOT Upper Limits
  7. GRB 100111A: Maidanak optical observations
  8. GRB 100418A: Maidanak optical observations
  9. GRB 100513A: CrAO optical observations
  10. GRB 100514A: CrAO optical observations
  11. GRB 100528A: GROND detection in all bands
  12. GRB 100528A: NOT optical observation
  13. GRB100526B: GROND Upper limits
  14. GRB 100526B: Swift/UVOT Upper Limits
  15. GRB 100526A: Swift/UVOT Upper Limits
  16. GRB 100526A: Gemini/NIRI infrared afterglow candidate
  17. GRB 100526A: NOT optical upper limit
  18. GRB 100526B: Swift XRT/UVOT observations
  19. GRB 100526A: MASTER-Net optical alert observations
  20. GRB 100522A: GROND observations, upper limits
  21. Swift/UVOT observations of GRB100522A.
  22. GRB 100522A: NIR observations from CAHA
  23. GRB 100418A: CrAO optical observations
  24. GRB 100518A: GROND afterglow observation and photo-z
  25. GRB 100518A: Swift/UVOT Upper Limits
  26. GRB 100518A: BOOTES-3 optical observations
  27. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  28. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  29. GRB 100514A: Swift/UVOT Observations
  30. GRB 100514A: YNAO-GMG observations
  31. GRB 100514A: MASTER-Net optical observations
  32. GRB 100514A: Faulkes Telescope South observations
  33. GRB 100513A: Faulkes Telescope South observations
  34. GRB 100513A: Swift/UVOT upper limits
  35. GRB 100513A: Gemini/GMOS Spectroscopic Redshift
  36. GRB 100513A: Lick observations and R-band dropout
  37. GRB 100513A: PAIRITEL continued observations and confirmation of fading
  38. GRB 100513A: PAIRITEL NIR afterglow candidate
  39. GRB 100511A: Super-LOTIS early observations
  40. GRB100508A: Further Swift/UVOT Observations
  41. GRB 100508A: GROND Detection of the optical afterglow
  42. GRB100508A: Swift/UVOT Detection of the Afterglow
  43. GRB 100418A: Keck imaging
  44. GRB 100418A: RTT150 optical observations
  45. GRB 100504A: Swift/UVOT Observations
  46. GRB 100418A: Flattening of the Swift/UVOT Optical Light Curve
  47. GRB 100504A: GROND Upper limits
  48. INTEGRAL observations of Swift GRB trigger 421072
  49. GRB 100420A: EVLA radio observations
  50. GRB 100420A: Gemini discovery of infrared afterglow
  51. GRB 100423A: xinglong TNT optical upper limit
  52. GRB 100427A: Swift XRT and UVOT Upper Limits
  53. GRB 100424a. Radio observations
  54. GRB 100418A: RTT150 optical observations
  55. GRB 100414A : EVLA Radio Detection
  56. GRB 100414A : WSRT Radio Detection
  57. GRB 100423A: CrAO optical observations
  58. GRB 100418A: Terskol optical observations
  59. GRB 100424A: CrAO optical observations
  60. GRB 100424A: NIR Afterglow Confirmation
  61. GRB 100424A: Gemini/NIRI H-band observations
  62. GRB100425A: Swift/UVOT Upper Limits
  63. GRB 100424A: Swift/UVOT Upper Limits
  64. GRB 100425A: GROND afterglow observation
  65. GRB 100424A: Gemini/NIRI Candidate Afterglow
  66. GRB 100425A: candidate optical afterglow from the VLT
  67. GRB 100424A : Lulin early z'-band upper limit
  68. GRB 100424A: GROND Upper Limits
  69. GRB 100424A: PAIRITEL NIR Upper Limits
  70. GRB 100424A: WHT z-band observations
  71. GRB 100424A: NOT optical observations
  72. GRB 100418A: ROVOR optical measurements at 35 hours
  73. GRB 100418A: Possible Evidence for a Supernova
  74. Swift Trigger 420256: IAC80 R-band observations
  75. Swift Trigger 420256: BOOTES-2 observations
  76. GRB 100423A: GROND discovery of afterglow
  77. Radio afterglow detection of GRB 100418A with the EVLA
  78. GRB 100414A: Radio Afterglow Detection with the Expanded VLA
  79. GRB 100418A: Continued PAIRITEL NIR Observations
  80. GRB 100418A: WSRT Radio Detection
  81. GRB 100418A: Continuing Swift/UVOT Observations
  82. GRB 100418A: further GROND observations and light curve fit
  83. GRB 100418A: RTT150 optical observations
  84. GRB 100414A: CFHT optical observations
  85. GRB 100420A: Swift/UVOT Upper Limits
  86. GRB 100418A: SARA second epoch
  87. GRB 100420A: SARA Upper Limits
  88. GRB 100418A: RTT150 observations during the optical afterglow maximum
  89. GRB 100418A: optical observations
  90. GRB 100418A: MASTER-Net optical observations
  91. GRB 100418A: VLT optical observations
  92. GRB 100418A: SMA submm detection
  93. GRB 100418A PAIRITEL NIR Observations
  94. GRB 100418A: ROVOR optical afterglow detection
  95. GRB 100418A: Swift/UVOT Observations
  96. GRB 100418A: SARA observations
  97. GRB100414A: SAO RAS optical observations
  98. GRB 100418A: GROND observations; missing author list added
  99. GRB 100418A: GROND observations
  100. GRB 100418A: ROTSE-III Optical Limits

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