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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"

32533 results found.

  1. GRB 100418A: Continuing Swift/UVOT Observations
  2. GRB 100418A: further GROND observations and light curve fit
  3. GRB 100418A: RTT150 optical observations
  4. GRB100420A: MITSuME optical upper limits
  5. GRB 100420A: Swift/UVOT Upper Limits
  6. GRB 100420A: XRT refined analysis
  7. GRB 100418A: SARA second epoch
  8. GRB 100420A: SARA Upper Limits
  9. GRB 100418A: RTT150 observations during the optical afterglow maximum
  10. GRB 100418A: optical observations
  11. GRB 100418A: MASTER-Net optical observations
  12. GRB 100414A: Confirmation of the X-ray afterglow
  13. GRB 100418A: VLT optical observations
  14. GRB 100420A: ROTSE-III Optical Limits
  15. GRB 100418A PAIRITEL NIR Observations
  16. GRB 100418A: ROVOR optical afterglow detection
  17. GRB 100418A: Swift/UVOT Observations
  18. GRB 100418A: Gemini-N redshift confirmation
  19. GRB 100413A: GMRT observation of radio afterglow
  20. GRB 100418A: Swift-XRT Refined Analysis
  21. GRB 100418A: host galaxy detection in the SDSS
  22. GRB100418A: VLT/X-shooter redshift and photometry
  23. GRB 100418A: SARA observations
  24. GRB100414A: SAO RAS optical observations
  25. GRB 100418A: GROND observations; missing author list added
  26. GRB 100418A: GROND observations
  27. GRB 100418A: Swift-BAT refined analysis
  28. GRB 100418A: ROTSE-III Optical Limits
  29. GRB 100413A: Radio Afterglow Detection with the EVLA
  30. GRB 100414A: Suzaku WAM observation of the prompt emission
  31. GRB 100414A: Swift/UVOT Observations
  32. GRB 100414A: Gemini-N observation (correction)
  33. GRB 100414A: GROND Detection of the Optical Afterglow
  34. GRB 100414A: Gemini-N candidate and redshift
  35. GRB 100413A: Suzaku WAM observation of the prompt emission
  36. GRB 100414A: Palomar Transient Factory Observations
  37. GRB 100413B: Swift Confirmation of Burst
  38. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  39. GRB 100413A: Swift-BAT final refined analysis
  40. GRB 100414A: IPN Localization
  41. Konus-Wind observation of GRB 100414A (correction to GCN 10597)
  42. Konus-Wind observation of GRB 100414B
  43. GRB 100413A: GROND Upper limits
  44. GRB 100413A: Swift/UVOT Upper Limits
  45. Konus-Wind observation of GRB 100413A
  46. GRB 100413A: Faulkes Telescope South observations
  47. Tentative redshift of GRB100413A from X-ray data
  48. GRB 100413A: SARA upper limit
  49. GRB 100413A: Swift-XRT Refined Analysis
  50. GRB 100413A: Swift-BAT initial refined analysis
  51. GRB 100413: xinglong TNT optical upper limit
  52. GRB 100413A: MASTER-Net optical observations
  53. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  54. Swift-BAT trigger 419015 is not astrophysical
  55. GRB100401A: GROND Upper Limits
  56. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  57. GRB 100331B: GROND Upper limits
  58. Master-Net observations on the Swift trigger on LS V +44 17
  59. GRB 100401A: Swift/UVOT Upper Limit
  60. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  61. GRB 100401A: Fermi GBM detection
  62. GRB 100331B: BOOTES-3 observations
  63. GRB 100316A: R-band limit
  64. GRB 100324B: Suzaku WAM observation of the prompt emission
  65. GRB 100331B: Swift/UVOT Upper Limits
  66. GRB 100331B: Swift/XRT possible afterglow candidate
  67. INTEGRAL trigger 5994 (GRB100331A): Swift/XRT observations
  68. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  69. GRB 100331A: BOOTES-3 observations
  70. Konus-Wind observation of GRB 100324B
  71. GRB 100331A: A long GRB detected by INTEGRAL
  72. IPN triangulation of GRB100324B
  73. Konus-Wind observation of GRB 100322A
  74. Short X-ray Transient detected by MAXI/GSC
  75. GRB 100322A: Suzaku WAM observation of the prompt emission
  76. GROND observations of GRB100316D/SN2010bh
  77. GRB 100324A: GROND observations
  78. Emerging Supernova in the Afterglow of GRB 100316D
  79. GRB 100316D: Spectroscopic Discovery of a Supernova from Magellan
  80. SGR 1833-0832: Swift/UVOT Upper Limits
  81. SGR 1833-0832: Archival Chandra Observations
  82. SGR 1833-0832 is pulsed at 7.56 seconds
  83. SGR 1833-0832 is pulsed at 7.56 seconds
  84. Possible pulsation period in SGR 1833-0832
  85. Discovery of the Spin Period of SGR 1833-0832
  86. GRB 100316D: ATCA radio observations
  87. GRB 100319A: correction to GCN 10527
  88. Probable SGR 1833-0832: Swift-XRT refined analysis
  89. Swift-XRT refined position of the probable new SGR 1833-0832
  90. Swift-BAT refined analysis of the probable new SGR 1833-0832
  91. GRB 100219A: MASTER-Net optical alert observations
  92. GRB 100316D: Possible Supernova
  93. GRB 100316D: Pre-burst emission measured by BAT
  94. GRB 100316D: Further Gemini observations
  95. GRB 100219A: optical upper limit
  96. GRB 100316A: optical observations in CrAO
  97. GRB 100316D: Swift/UVOT Observations
  98. GRB 100316D: Swift XRT enhanced position and further refined analysis
  99. GRB 100316B: Swift-XRT refined analysis
  100. Tentative redshift of GRB100316D from X-ray data

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