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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"

12318 results found.

  1. GRB 080915: Swift/UVOT Upper Limits
  2. GRB080913: Swift/UVOT Upper Limits
  3. GRB 080913: Swift detection of a burst
  4. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  5. GRB080905A: Swift/UVOT Upper Limits
  6. GRB 080905A: MITSuME Akeno optical upper limits
  7. GRB 080906: Refined Swift/UVOT Observations
  8. GRB 080905B: Refined UVOT Analysis
  9. GRB 080905: Swift detection of a probably-short burst
  10. GRB 080903: Swift/UVOT Observations
  11. GRB 080903: Swift detection of a burst
  12. Recent VLA non-detection of SGR 0501+4516
  13. nIR observations of SGR 0501+4516
  14. GRB080828: Swift/UVOT Upper Limits
  15. GRB080825B: Swift/UVOT Upper Limits
  16. VLA non-detection of SGR 0501+4516
  17. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  18. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  19. GRB 080810: Swift/UVOT Refined Analysis
  20. GRB 080723B: GROND upper limits
  21. GRB 080727B: Late VLT imaging
  22. GRB 080805: Swift/UVOT Upper Limits
  23. GRB 080804: Swift/UVOT Refined Analysis
  24. GRB 080805: VLT redshift
  25. GRB 080805: Swift detection of a burst
  26. GRB 080802: Swift/UVOT Upper Limits
  27. GRB 080802: UVI Telescope Upper Limit
  28. GRB 080802: Swift detection of a probable burst
  29. GRB 080727B: GROND redshift limit
  30. GRB 080727C: Swift/UVOT Upper Limits
  31. GRB 080727A: VLT upper limits
  32. GRB 080727C: Swift detection of a burst
  33. Swift detection of XTE J1701-407
  34. GRB 080727B: Swift/UVOT Upper Limits
  35. GRB 080727A: Swift-XRT refined analysis
  36. GRB080727A: Swift/UVOT Upper Limits
  37. GRB 080727B: Swift detection of a bright burst
  38. GRB 080727: Swift detection of a burst
  39. GRB 080723A: optical upper limit
  40. GRB080723B: Swift/UVOT Upper Limits
  41. ATCA radio upper limit on GRB 080723B
  42. GRB 080723A: Swift/UVOT Upper Limits
  43. VLA radio upper limit on GRB 080721
  44. GRB 080723B: AGILE GRID and MCAL results
  45. Trigger 317393: Swift detection of a possible GRB
  46. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  47. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  48. GRB 080714: Swift detection of a burst
  49. GRB 080702A: optical upper limit
  50. GRB 080710: TLS observations, steepening afterglow decay
  51. GRB 080702B: Swift XRT confirmation of the afterglow
  52. UVOT observations of GRB080707
  53. GRB 080707: VLT redshift
  54. GRB 080707: Swift detection of a burst
  55. GRB 080703: GROND Upper Limits
  56. GRB 080702B: GROND Upper Limits
  57. Swift/UVOT observation of GRB080702A
  58. GRB 080702B: Swift XRT and UVOT observations
  59. GRB 080702A: MITSuME Akeno optical upper limits
  60. Swift Trigger 315630: Swift/UVOT Upper Limits
  61. Swift Trigger 315630: Probably not a GRB
  62. GRB 080701A, VATT optical upper limit
  63. GRB 080701A: Swift/UVOT Upper Limits
  64. GRB 080701A: Early Super-LOTIS Observations
  65. GRB 080623: GROND upper limits
  66. GRB080623: Swift UVOT followup observations
  67. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  68. Swift trigger 314975 is not a GRB
  69. VLA upper limit on INTEGRAL burst GRB 080613A
  70. GRB080613B: MITSuME upper limits
  71. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  72. Konus-Wind observation of GRB 080613B
  73. GRB 080603A: optical observations on June 04
  74. GRB080613A: Swift/UVOT Upper Limits
  75. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  76. GRB 080613B: GROND Upper Limits
  77. GRB080613B: Swift/UVOT Upper Limits
  78. GRB 080613B: Swift detection of a burst
  79. Swift observations of BAT Slew Survey event (Trigger=010)
  80. GRB 080603B - TLS 2nd Epoch: Another Break
  81. Swift/UVOT Observations of GRB080607
  82. GRB 080604: VLA radio upper limit
  83. GRB 080603B: VLA radio upper limit
  84. GRB 080605: VLT redshift
  85. Swift/UVOT observations of GRB080604
  86. GRB080604: HET redshift retraction
  87. Konus-Wind observation of GRB 080602
  88. GRB 080602: NOT R-band upper limit
  89. Swift analysis of BAT Slew Survey event (Trigger=009)
  90. Reactivation of SGR 1627-41
  91. GRB 080524: Swift XRT and UVOT analysis
  92. GRB 080503: 2nd Epoch Chandra X-ray Observations
  93. GRB 080523: Swift detection of a burst
  94. GRB 80516: Swift/UVOT Observations
  95. GRB 080514B: UVOT Observations
  96. GRB080520: Swift/UVOT observations
  97. GRB 080520: VLT redshift
  98. GRB 080514B: Suzaku WAM observation of the prompt emission
  99. GRB 080516, GROND further analysis
  100. GRB 080517: Swift detection of a burst

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