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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"

43012 results found.

  1. Konus-Wind observation of GRB 100724B
  2. GRB 100725A: Prompt enhanced Swift-XRT position
  3. GRB 100725A: Swift detection of a burst
  4. GRB 100724B: Fermi LAT and GBM analysis
  5. GRB 100724B: Fermi GBM detection
  6. GRB 100724A: Swift/BAT spectral lag results
  7. GRB 100724A: Swift XRT refined analysis
  8. GRB 100724A: Enhanced Swift-XRT position
  9. GRB 100724A: Swift/UVOT observations
  10. GRB 100724A: Swift-BAT refined analysis
  11. GRB 100724A: X-shooter redshift
  12. GRB 100724A: fading afterglow seen with GROND
  13. GRB 100724A, GROND detection of an afterglow candidate
  14. GRB 100724A: Swift detection of a burst
  15. GRB 100614A: 10.4-m GTC deep-optical limit
  16. GRB 100722A: Fermi GBM detection
  17. GRB 100718A: MASTER-Net optical prompt and alert observations
  18. GRB 100719A: Swift-BAT refined analysis
  19. GRB 100719A: Swift detection of a burst
  20. GRB 100713A: optical observation in Maidanak
  21. GRB 100713A: further inspection of TNG images
  22. GRB 100713A: Swift XRT refined analysis
  23. GRB 100713A : IRSF/SIRIUS NIR upper limits
  24. GRB100713A: Swift/UVOT observations
  25. GRB 100713A: GROND upper limits
  26. GRB 100713A: optical upper limit
  27. GRB 100713A: TNG optical observations
  28. GRB 100713A: TELMA and 1.5m OSN optical observations
  29. GRB100713A: Swift X-ray afterglow detection
  30. GRB 100713A: a long GRB detected by INTEGRAL
  31. GRB 100707A: Suzaku WAM observation of the prompt emission
  32. Konus-Wind observation of GRB 100707A
  33. IPN triangulation of GRB 100707A
  34. GRB 100628A: Keck/LRIS Spectroscopy of Host Galaxy Candidate
  35. GRB 100707A: Fermi LAT detection
  36. GRB 100707A: Fermi GBM detection
  37. GRB 100628A: Near-IR sources coincident with the possible X-ray afterglow
  38. GRB 100628A: Chandra observations
  39. GRB 100628A: Swift XRT/UVOT refined analysis
  40. Tentative redshift of GRB100704A from Swift-XRT data
  41. Konus-Wind observation of GRB 100701B
  42. IPN triangulation of GRB 100701B
  43. Konus-Wind observation of GRB 100704A
  44. GRB 100703A: a short GRB detected by INTEGRAL
  45. GRB 100704A: Swift XRT refined analysis
  46. GRB 100704: Swift/UVOT Upper Limits
  47. GRB 100704A: Fermi GBM observation
  48. GRB 100704A: Swift-BAT refined analysis
  49. GRB100704A: MOA optical upper limit
  50. GRB 100704A: Enhanced Swift-XRT position
  51. GRB 100704A: Swift detection of a burst
  52. GRB 100615A: Additional Gemini/NIRI observations
  53. GRB 100526A: Gemini/NIRI afterglow confirmation and host galaxy
  54. GRB 100702A: Swift XRT refined analysis
  55. Swift/UVOT observations of GRB100702A
  56. GRB 100702A: Second epoch of Magellan near-IR observations and afterglow limits
  57. GRB 100701B: Fermi GBM detection
  58. GRB 100702A: Magellan near-IR observations
  59. GRB 100702A: VLT optical observations
  60. GRB 100702: ROTSE-III Optical Limits
  61. GRB 100702A: Swift detection of a short burst
  62. GRB 100615A: Chandra X-ray ToO Observation
  63. XRF 100701A : MAXI/GSC detection of a probable XRF
  64. GRB 100213B: Detection of Fading Optical Afterglow
  65. GRB 100625A: Fermi GBM detection
  66. GRB 100628A: Second epoch of Magellan near-IR observations
  67. GRB 100628A: GROND optical/NIR observations of the host candidate
  68. GRB 100628A: Swift XRT refined position
  69. GRB100625A: GROND confirmation of constant source
  70. GRB 100625A Gemini-South 2nd epoch imaging
  71. GRB100628A : MOA optical upper limit
  72. GRB 090709A: Host galaxy detection
  73. GRB 100628A: Swift/UVOT Upper Limits
  74. GRB 100628A: Swift XRT detection of a possible X-ray afterglow
  75. GRB 100628A: INTEGRAL SPI-ACS light curve
  76. GRB 100625A: Magellan near-IR Observations
  77. GRB 100628A: Swift-BAT refined analysis
  78. GRB 100628A: Swift detection of a short hard burst
  79. Swift-BAT trigger 426048 is not a burst
  80. GRB 100625A: Swift/UVOT Upper Limits
  81. GRB 100625A: Swift-BAT refined analysis
  82. Konus-Wind observation of GRB 100625A
  83. GRB 100625A : IRSF/SIRIUS NIR upper limit
  84. GRB 100625A: Swift-XRT Team refined analysis
  85. GRB 100625A: Gemini candidate afterglow
  86. GRB 100625A: Enhanced Swift-XRT position
  87. GRB100625A : MOA optical upper limit
  88. GRB 100625A: Swift detection of a short hard burst
  89. GRB 100418A: late time optical observations
  90. Konus-Wind observation of GRB 100621A
  91. GRB 100621A: IRSF/SIRIUS NIR Observation
  92. GRB 100621A MOA-II optical limit
  93. GRB 100621A: Swift/UVOT observations
  94. GRB 100621A: Swift XRT refined analysis
  95. GRB 100621A: VLT/X-shooter redshift
  96. GRB 100621A: Swift-BAT refined analysis
  97. GRB 100621A: GROND observation of bright NIR afterglow
  98. GRB 100621A: Enhanced Swift-XRT position
  99. GRB 100621A: Prompt enhanced Swift-XRT position
  100. GRB 100621A: ROTSE-III Optical Limits

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