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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"

20519 results found.

  1. GRB 100418A: SARA observations
  2. GRB100414A: SAO RAS optical observations
  3. GRB 100418A: GROND observations; missing author list added
  4. GRB 100418A: GROND observations
  5. GRB 100418A: ROTSE-III Optical Limits
  6. GRB 100413A: Radio Afterglow Detection with the EVLA
  7. GRB 100414A: Swift/UVOT Observations
  8. GRB 100414A: GROND Detection of the Optical Afterglow
  9. GRB 100414A: Gemini-N candidate and redshift
  10. GRB 100414A: Palomar Transient Factory Observations
  11. GRB 100413B: Swift Confirmation of Burst
  12. GRB 100415A: MAXI/GSC detection of a probable GRB
  13. GRB 100413B : Swift detection of a burst
  14. GRB 100413A: GROND Upper limits
  15. GRB 100413A: Swift/UVOT Upper Limits
  16. GRB 100413A: Faulkes Telescope South observations
  17. GRB 100413A: SARA upper limit
  18. GRB 100413: xinglong TNT optical upper limit
  19. GRB 100413A: MASTER-Net optical observations
  20. GRB100401A: GROND Upper Limits
  21. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  22. MASTER observations on the Swift second trigger on LS V +44 17
  23. GRB 100331B: GROND Upper limits
  24. Master-Net observations on the Swift trigger on LS V +44 17
  25. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  26. GRB 100331B: BOOTES-3 observations
  27. GRB 100331B: Swift/UVOT Upper Limits
  28. INTEGRAL trigger 5994 (GRB100331A): Swift/XRT observations
  29. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  30. GRB 100331A: BOOTES-3 observations
  31. GROND observations of GRB100316D/SN2010bh
  32. GRB 100324A: GROND observations
  33. GRB 100316D: Spectroscopic Discovery of a Supernova from Magellan
  34. SGR 1833-0832: Swift/UVOT Upper Limits
  35. SGR 1833-0832: Archival Chandra Observations
  36. Possible pulsation period in SGR 1833-0832
  37. Discovery of the Spin Period of SGR 1833-0832
  38. GRB 100316D: ATCA radio observations
  39. GRB 100319A: correction to GCN 10527
  40. GRB 100219A: MASTER-Net optical alert observations
  41. GRB 100316D: Possible Supernova
  42. GRB 100316D: Pre-burst emission measured by BAT
  43. GRB 100316D: Further Gemini observations
  44. GRB 100219A: optical upper limit
  45. GRB 100316A: optical observations in CrAO
  46. GRB 100316D: Swift/UVOT Observations
  47. GRB 100316D: Swift XRT enhanced position and further refined analysis
  48. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  49. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  50. GRB 100316D: Gemini/GMOS and VLT/X-shooter observations
  51. GRB 100316D: VLT/X-shooter observations
  52. GRB100316C: Swift/UVOT Upper Limits
  53. GRB 100316B: Swift/UVOT observations
  54. GRB 100316A: TAROT Calern observatory optical observations
  55. GRB 100316A: Swift-XRT refined analysis
  56. GRB100316A: Swift/UVOT Upper Limits
  57. GRB 100316C: BOOTES-3 observations
  58. GRB 100316B: VLT/X-shooter redshift
  59. GRB 100316B: Skynet/PROMPT Observations of Fading
  60. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  61. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  62. GRB 100316 optical candidate from 1.23m CAHA telescope
  63. GRB 100316 optical candidate from 1.23m CAHA telescope
  64. GRB 100316A: Swift/UVOT Observations
  65. GRB 100305A: Super-LOTIS early observations
  66. GRB100302A : LOAO observations and Lulin afterglow analysis
  67. GRB 100305A: Gemini z'-band observation
  68. GRB 100305A: Swift/UVOT Upper Limits
  69. GRB 100305A Optical Observations
  70. GRB 100305A: PAIRITEL NIR Upper Limits
  71. GRB 100305A: P60 Observations
  72. GRB 100302A: Swift/UVOT Upper Limits
  73. GRB 100302A: Optical observations at Crni Vrh
  74. GRB 100302A: MASTER-Net optical alert observations
  75. GRB 1000302A : A possible afterglow candidate
  76. GRB 100302A: Skynet/DAO Observations
  77. GRB 100206A: optical observations in CrAO
  78. GRB 100206A: optical observations in Terskol
  79. GRB 100213B: Mondy optical observations
  80. GRB 100219A: optical observations
  81. GRB 100224A SHB found in ground analysis of BAT data
  82. GRB
  83. GRB 100219A: X-shooter refined analysis
  84. GRB 100219A - Gemini South Spectroscopy
  85. GRB 100216A: Swift/UVOT Observations
  86. GRB 100219A: VLT/X-shooter redshift
  87. GRB 100219A: GROND observations
  88. GRB 100219A: NOT OA observations
  89. GRB 100219A: Swift/UVOT Detection of the Optical Afterglow
  90. GRB 100216A: XRT Refined Analysis
  91. GRB 100213B: Gemini-N Observations
  92. GRB 100213B: Swift/UVOT Upper Limits
  93. GRB 100213A: Swift/UVOT Upper Limits
  94. GRB 100213B: PAIRITEL NIR Upper Limits
  95. GRB 100213A: SARA observations
  96. GRB 100213A: Swift XRT refined analysis
  97. GRB 100213B: NOT optical observations
  98. GRB 100206A: Second epoch Gemini-north observations and afterglow limits
  99. Swift/UVOT observations of GRB100212A - correction of the name of the burst
  100. Swift/UVOT observations of GRB120212A

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