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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"

32510 results found.

  1. GRB100414A: SAO RAS optical observations
  2. GRB 100418A: GROND observations; missing author list added
  3. GRB 100418A: GROND observations
  4. GRB 100418A: Swift-BAT refined analysis
  5. GRB 100418A: ROTSE-III Optical Limits
  6. GRB 100413A: Radio Afterglow Detection with the EVLA
  7. GRB 100414A: Suzaku WAM observation of the prompt emission
  8. GRB 100414A: Swift/UVOT Observations
  9. GRB 100414A: Gemini-N observation (correction)
  10. GRB 100414A: GROND Detection of the Optical Afterglow
  11. GRB 100414A: Gemini-N candidate and redshift
  12. GRB 100413A: Suzaku WAM observation of the prompt emission
  13. GRB 100414A: Palomar Transient Factory Observations
  14. GRB 100413B: Swift Confirmation of Burst
  15. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  16. GRB 100413A: Swift-BAT final refined analysis
  17. GRB 100414A: IPN Localization
  18. Konus-Wind observation of GRB 100414A (correction to GCN 10597)
  19. Konus-Wind observation of GRB 100414B
  20. GRB 100413A: GROND Upper limits
  21. GRB 100413A: Swift/UVOT Upper Limits
  22. Konus-Wind observation of GRB 100413A
  23. GRB 100413A: Faulkes Telescope South observations
  24. Tentative redshift of GRB100413A from X-ray data
  25. GRB 100413A: SARA upper limit
  26. GRB 100413A: Swift-XRT Refined Analysis
  27. GRB 100413A: Swift-BAT initial refined analysis
  28. GRB 100413: xinglong TNT optical upper limit
  29. GRB 100413A: MASTER-Net optical observations
  30. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  31. Swift-BAT trigger 419015 is not astrophysical
  32. GRB100401A: GROND Upper Limits
  33. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  34. GRB 100331B: GROND Upper limits
  35. Master-Net observations on the Swift trigger on LS V +44 17
  36. GRB 100401A: Swift/UVOT Upper Limit
  37. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  38. GRB 100401A: Fermi GBM detection
  39. GRB 100331B: BOOTES-3 observations
  40. GRB 100316A: R-band limit
  41. GRB 100324B: Suzaku WAM observation of the prompt emission
  42. GRB 100331B: Swift/UVOT Upper Limits
  43. GRB 100331B: Swift/XRT possible afterglow candidate
  44. INTEGRAL trigger 5994 (GRB100331A): Swift/XRT observations
  45. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  46. GRB 100331A: BOOTES-3 observations
  47. Konus-Wind observation of GRB 100324B
  48. GRB 100331A: A long GRB detected by INTEGRAL
  49. IPN triangulation of GRB100324B
  50. Konus-Wind observation of GRB 100322A
  51. Short X-ray Transient detected by MAXI/GSC
  52. GRB 100322A: Suzaku WAM observation of the prompt emission
  53. GROND observations of GRB100316D/SN2010bh
  54. GRB 100324A: GROND observations
  55. Emerging Supernova in the Afterglow of GRB 100316D
  56. GRB 100316D: Spectroscopic Discovery of a Supernova from Magellan
  57. SGR 1833-0832: Swift/UVOT Upper Limits
  58. SGR 1833-0832: Archival Chandra Observations
  59. SGR 1833-0832 is pulsed at 7.56 seconds
  60. SGR 1833-0832 is pulsed at 7.56 seconds
  61. Possible pulsation period in SGR 1833-0832
  62. Discovery of the Spin Period of SGR 1833-0832
  63. GRB 100316D: ATCA radio observations
  64. GRB 100319A: correction to GCN 10527
  65. Probable SGR 1833-0832: Swift-XRT refined analysis
  66. Swift-XRT refined position of the probable new SGR 1833-0832
  67. Swift-BAT refined analysis of the probable new SGR 1833-0832
  68. GRB 100219A: MASTER-Net optical alert observations
  69. GRB 100316D: Possible Supernova
  70. GRB 100316D: Pre-burst emission measured by BAT
  71. GRB 100316D: Further Gemini observations
  72. GRB 100219A: optical upper limit
  73. GRB 100316A: optical observations in CrAO
  74. GRB 100316D: Swift/UVOT Observations
  75. GRB 100316D: Swift XRT enhanced position and further refined analysis
  76. GRB 100316B: Swift-XRT refined analysis
  77. Tentative redshift of GRB100316D from X-ray data
  78. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  79. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  80. GRB 100316D: Gemini/GMOS and VLT/X-shooter observations
  81. GRB 100316D: VLT/X-shooter observations
  82. GRB 100316D: Swift-BAT refined analysis
  83. GRB100316C: Swift/UVOT Upper Limits
  84. GRB 100316C: Swift-BAT refined analysis
  85. GRB 100316B: Swift/UVOT observations
  86. GRB 100316C: Swift-XRT team refined analysis
  87. GRB 100316D: Swift XRT refined analysis
  88. GRB 100316A: TAROT Calern observatory optical observations
  89. GRB 100316A: Swift-XRT refined analysis
  90. GRB 100316A: Swift-BAT refined analysis
  91. GRB 100316B: Swift-BAT refined analysis
  92. GRB100316A: Swift/UVOT Upper Limits
  93. GRB 100316C: BOOTES-3 observations
  94. GRB 100316B: VLT/X-shooter redshift
  95. GRB 100316B: Skynet/PROMPT Observations of Fading
  96. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  97. GRB 100316 optical candidate from 1.23m CAHA telescope
  98. GRB 100316 optical candidate from 1.23m CAHA telescope
  99. GRB 100316A: Swift/UVOT Observations
  100. GRB 100305A: Super-LOTIS early observations

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