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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"

42290 results found.

  1. GRB 100413A: SARA upper limit
  2. GRB 100413A: Swift-XRT Refined Analysis
  3. GRB 100413A: Swift-BAT initial refined analysis
  4. GRB 100413A: Enhanced Swift-XRT position
  5. GRB 100413: xinglong TNT optical upper limit
  6. GRB 100413A: MASTER-Net optical observations
  7. GRB 100413A: Swift detection of a burst
  8. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  9. Swift-BAT trigger 419015 is not astrophysical
  10. Trigger 419015 is probably not a GRB
  11. GRB100401A: GROND Upper Limits
  12. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  13. MASTER observations on the Swift second trigger on LS V +44 17
  14. GRB 100331B: GROND Upper limits
  15. Master-Net observations on the Swift trigger on LS V +44 17
  16. GRB 100401A: Swift/UVOT Upper Limit
  17. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  18. GRB 100401A: Fermi GBM detection
  19. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  20. GRB 100331B: BOOTES-3 observations
  21. GRB 100316A: R-band limit
  22. GRB 100324B: Suzaku WAM observation of the prompt emission
  23. GRB 100331B: Swift/UVOT Upper Limits
  24. GRB 100331B: Swift/XRT possible afterglow candidate
  25. Swift detection of LS V +44 17
  26. GRB 100331B: SuperAGILE Localization of a Long GRB
  27. INTEGRAL trigger 5994 (GRB100331A): Swift/XRT observations
  28. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  29. GRB 100331A: BOOTES-3 observations
  30. Konus-Wind observation of GRB 100324B
  31. GRB 100331A: A long GRB detected by INTEGRAL
  32. Konus-Wind observation of GRB 100322A
  33. Short X-ray Transient detected by MAXI/GSC
  34. GRB 100322A: Suzaku WAM observation of the prompt emission
  35. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  36. GRB 100325A: Fermi LAT detection
  37. GROND observations of GRB100316D/SN2010bh
  38. GRB 100325A: Fermi GBM detection
  39. GRB 100324A: GROND observations
  40. GRB 100324A found in ground analysis of BAT data
  41. Emerging Supernova in the Afterglow of GRB 100316D
  42. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  43. GRB 100316D: Spectroscopic Discovery of a Supernova from Magellan
  44. SGR 1833-0832: Swift/UVOT Upper Limits
  45. GRB 100322A: Fermi GBM detection
  46. SGR 1833-0832: Archival Chandra Observations
  47. SGR 1833-0832 is pulsed at 7.56 seconds
  48. SGR 1833-0832 is pulsed at 7.56 seconds
  49. Discovery of the Spin Period of SGR 1833-0832
  50. GRB 100316D: ATCA radio observations
  51. GRB 100319A: correction to GCN 10527
  52. Probable SGR 1833-0832: Swift-XRT refined analysis
  53. Probable SGR 1833-0832: Enhanced Swift-XRT position
  54. Swift-XRT refined position of the probable new SGR 1833-0832
  55. Swift-BAT refined analysis of the probable new SGR 1833-0832
  56. GRB 100219A: MASTER-Net optical alert observations
  57. GRB 100319A: Swift detection of a burst; possible SGR
  58. GRB 100316D: Possible Supernova
  59. GRB 100316D: Pre-burst emission measured by BAT
  60. GRB 100219A: optical upper limit
  61. GRB 100316A: optical observations in CrAO
  62. GRB 100316D: Swift/UVOT Observations
  63. GRB 100316D: Swift XRT enhanced position and further refined analysis
  64. GRB 100316B: Swift-XRT refined analysis
  65. Tentative redshift of GRB100316D from X-ray data
  66. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  67. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  68. GRB 100316D: Gemini/GMOS and VLT/X-shooter observations
  69. GRB 100316D: VLT/X-shooter observations
  70. GRB 100316D: Swift-BAT refined analysis
  71. GRB 100316C: Swift-BAT refined analysis
  72. GRB 100316B: Swift/UVOT observations
  73. GRB 100316C: Swift-XRT team refined analysis
  74. GRB 100316C: Enhanced Swift-XRT position
  75. GRB 100316D: Swift XRT refined analysis
  76. GRB 100316A: TAROT Calern observatory optical observations
  77. GRB 100316A: Swift-XRT refined analysis
  78. GRB 100316B: Enhanced Swift-XRT position
  79. GRB 100316A: Swift-BAT refined analysis
  80. GRB 100316B: Swift-BAT refined analysis
  81. Trigger 416140 is almost certainly not a GRB
  82. GRB 100316D: Swift detection of a burst
  83. GRB 100316B: VLT/X-shooter redshift
  84. GRB 100316B: Skynet/PROMPT Observations of Fading
  85. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  86. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  87. GRB 100316C: Swift detection of a burst
  88. GRB 100316A: Enhanced Swift-XRT position
  89. GRB 100316B: Swift detection of a burst with optical counterpart
  90. GRB 100316 optical candidate from 1.23m CAHA telescope
  91. GRB 100316 optical candidate from 1.23m CAHA telescope
  92. GRB 100316A: Swift/UVOT Observations
  93. GRB 100316A: Swift-XRT detection
  94. GRB 100316A: Swift detection of a burst
  95. IBAS Alert 5992 is not a GRB, but XTE J1855-026
  96. GRB100305A: Optical upper limits at IAO
  97. GRB 100305A: Super-LOTIS early observations
  98. GRB100302A : LOAO observations and Lulin afterglow analysis
  99. GRB 100305A, Swift-BAT refined analysis
  100. GRB 100305A: Gemini z'-band observation

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