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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"

39314 results found.

  1. GRB 100725B: Swift-BAT refined analysis
  2. GRB 100725B: refined XRT analysis
  3. GRB 100725A: GROND upper limits
  4. GRB 100725B: Swift/UVOT Upper Limits
  5. GRB 100725A: Swift/UVOT Upper Limits
  6. GRB 100725A: Swift-BAT refined analysis
  7. GRB 100725A: Swift XRT refined analysis
  8. GRB 100725B: Enhanced Swift-XRT position
  9. GRB 100725A: Enhanced Swift-XRT position
  10. GRB100725B: Faulkes Telescope North observations
  11. GRB 100725B: Swift detection of a burst
  12. Konus-Wind observation of GRB 100724B
  13. GRB 100725A: Prompt enhanced Swift-XRT position
  14. GRB 100725A: Swift detection of a burst
  15. GRB 100724B: Fermi LAT and GBM analysis
  16. GRB 100724B: Fermi GBM detection
  17. GRB 100724A: Swift/BAT spectral lag results
  18. GRB 100724A: Swift XRT refined analysis
  19. GRB 100724A: Enhanced Swift-XRT position
  20. GRB 100724A: Swift/UVOT observations
  21. GRB 100724A: Swift-BAT refined analysis
  22. GRB 100724A: X-shooter redshift
  23. GRB 100724A: fading afterglow seen with GROND
  24. GRB 100724A, GROND detection of an afterglow candidate
  25. GRB 100724A: Swift detection of a burst
  26. GRB 100614A: 10.4-m GTC deep-optical limit
  27. GRB 100722A: Fermi GBM detection
  28. GRB 100718A: MASTER-Net optical prompt and alert observations
  29. GRB 100719A: Swift-BAT refined analysis
  30. GRB 100719A: Swift detection of a burst
  31. GRB 100713A: optical observation in Maidanak
  32. GRB 100713A: further inspection of TNG images
  33. GRB 100713A: Swift XRT refined analysis
  34. GRB 100713A : IRSF/SIRIUS NIR upper limits
  35. Fermi GBM trigger 300794561 (100714419) is not a GRB
  36. GRB 100713A: GROND upper limits
  37. GRB 100713A: optical upper limit
  38. GRB 100713A: TNG optical observations
  39. GRB 100713A: TELMA and 1.5m OSN optical observations
  40. GRB100713A: Swift X-ray afterglow detection
  41. GRB 100713A: a long GRB detected by INTEGRAL
  42. GRB 100707A: Suzaku WAM observation of the prompt emission
  43. Fermi GBM trigger 300370702 (100709513) is not a GRB
  44. Konus-Wind observation of GRB 100707A
  45. IPN triangulation of GRB 100707A
  46. GRB 100628A: Keck/LRIS Spectroscopy of Host Galaxy Candidate
  47. GRB 100707A: Fermi LAT detection
  48. GRB 100707A: Fermi GBM detection
  49. GRB 100628A: Near-IR sources coincident with the possible X-ray afterglow
  50. GRB 100628A: Chandra observations
  51. GRB 100628A: Swift XRT/UVOT refined analysis
  52. Tentative redshift of GRB100704A from Swift-XRT data
  53. Konus-Wind observation of GRB 100701B
  54. IPN triangulation of GRB 100701B
  55. Konus-Wind observation of GRB 100704A
  56. GRB 100703A: a short GRB detected by INTEGRAL
  57. GRB 100704A: Swift XRT refined analysis
  58. GRB 100704: Swift/UVOT Upper Limits
  59. GRB 100704A: Fermi GBM observation
  60. GRB 100704A: Swift-BAT refined analysis
  61. GRB 100704A: Enhanced Swift-XRT position
  62. GRB 100704A: Swift detection of a burst
  63. GRB 100615A: Additional Gemini/NIRI observations
  64. GRB 100526A: Gemini/NIRI afterglow confirmation and host galaxy
  65. GRB 100702A, Swift-BAT refined analysis
  66. Fermi GBM trigger 299767472 (100702531) is not a GRB
  67. GRB 100702A: Swift XRT refined analysis
  68. Swift/UVOT observations of GRB100702A
  69. GRB 100702A: Second epoch of Magellan near-IR observations and afterglow limits
  70. GRB 100701B: Fermi GBM detection
  71. GRB 100702A: Magellan near-IR observations
  72. GRB 100702A: VLT optical observations
  73. GRB 100702: ROTSE-III Optical Limits
  74. GRB 100702A: Swift detection of a short burst
  75. GRB 100615A: Chandra X-ray ToO Observation
  76. XRF 100701A : MAXI/GSC detection of a probable XRF
  77. GRB 100213B: Detection of Fading Optical Afterglow
  78. GRB 100625A: Fermi GBM detection
  79. GRB 100628A: Second epoch of Magellan near-IR observations
  80. GRB 100628A: GROND optical/NIR observations of the host candidate
  81. GRB 100628A: Gemini North Observations
  82. GRB 100628A: Coincidence of source "G1" with revised XRT error circle
  83. GRB 100628A: Swift XRT refined position
  84. GRB100625A: GROND confirmation of constant source
  85. GRB 100625A Gemini-South 2nd epoch imaging
  86. GRB 090709A: Host galaxy detection
  87. GRB 100628A: Magellan near-IR observations
  88. GRB 100628A: Swift/UVOT Upper Limits
  89. GRB 100628A: Swift XRT detection of a possible X-ray afterglow
  90. GRB 100628A: INTEGRAL SPI-ACS light curve
  91. GRB 100625A: Magellan near-IR Observations
  92. GRB 100628A: Swift-BAT refined analysis
  93. GRB 100628A: Swift detection of a short hard burst
  94. GRB 100614A: CrAO optical limit
  95. GRB 100625A: Swift/UVOT Upper Limits
  96. GRB 100625A: Swift-BAT refined analysis
  97. Konus-Wind observation of GRB 100625A
  98. GRB 100625A : IRSF/SIRIUS NIR upper limit
  99. GRB 100625A: Swift-XRT Team refined analysis
  100. GRB 100625A: Gemini candidate afterglow

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