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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"

23410 results found.

  1. GRB 080727C: Swift detection of a burst
  2. Swift detection of XTE J1701-407
  3. GRB 080727B: Swift/UVOT Upper Limits
  4. GRB 080727B: Swift-XRT refined analysis
  5. GRB 080727B, Swift-BAT refined analysis
  6. GRB080727A: Swift/UVOT Upper Limits
  7. GRB 080727B: Enhanced Swift-XRT position
  8. GRB 080727A: Enhanced Swift-XRT position
  9. GRB 080727B: REM prompt observations
  10. GRB 080727B: Swift detection of a bright burst
  11. GRB 080727: Swift detection of a burst
  12. GRB 080723A: optical upper limit
  13. GRB080723B: Swift/UVOT Upper Limits
  14. GRB 080725: REM prompt observations
  15. GRB 080725: Swift detection of a burst
  16. GRB 080723A: Swift/UVOT Upper Limits
  17. VLA radio upper limit on GRB 080721
  18. GRB 080723, Swift-BAT refined analysis
  19. GRB 080723B: Detection and Localization by SuperAGILE
  20. GRB 080723B : a long GRB detected with INTEGRAL
  21. GRB 080723: Enhanced Swift-XRT position
  22. GRB 080723: Swift detection of a burst
  23. GRB 080721: OA fading and redshift
  24. GRB 080721: Enhanced Swift-XRT position
  25. GRB 080721: Swift detection of a burst with a bright optical counterpart.
  26. Trigger 317393: Swift detection of a possible GRB
  27. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  28. GRB 080714: GROND confirmation of the optical/NIR afterglow
  29. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  30. GRB 080714: Swift-XRT refined analysis
  31. GRB 080714: Enhanced Swift-XRT position
  32. GRB 080714: Swift-BAT refined analysis
  33. GRB 080714: Swift detection of a burst
  34. GRB 080702A: optical upper limit
  35. GRB 080603A: CrAO optical observations
  36. GRB 080710: TLS observations, steepening afterglow decay
  37. GRB 080702B: Swift XRT confirmation of the afterglow
  38. GRB 080710: Lick IR detection
  39. GRB 080710: Swift-XRT refined analysis
  40. GRB080710: Swift/UVOT observations
  41. GRB 080710: Enhanced Swift-XRT position
  42. UVOT white band observations of GRB080710
  43. GRB 080710: REM afterglow confirmation & brightening
  44. GRB 080710: Swift XRT position
  45. GRB 080710: Swift detection of a burst
  46. New Swift-XRT GRB products available online.
  47. GRB 080707: GROND Confirmation of the Optical Afterglow
  48. UVOT observations of GRB080707
  49. GRB 080707: Swift XRT refined analysis
  50. GRB 080707: Enhanced Swift-XRT position
  51. GRB 080707: VLT redshift
  52. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  53. GRB 080707: Swift detection of a burst
  54. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  55. Trigger 316063: Swift detection of a transient
  56. GRB 080703: GROND Upper Limits
  57. GRB 080702B: GROND Upper Limits
  58. GRB 080703: Swift-XRT refined analysis
  59. GRB 080703: VLT observations of the afterglow
  60. GRB 080703: Enhanced Swift-XRT position
  61. GRB 080702B Swift-BAT refined analysis
  62. GRB 080703: Swift detection of a burst with optical afterglow
  63. No radio detection from the short GRB 080702A
  64. Swift/UVOT observation of GRB080702A
  65. GRB 080702B: Swift XRT and UVOT observations
  66. GRB 080702A: MITSuME Akeno optical upper limits
  67. GRB 080701A: Early RAPTOR optical limits
  68. Swift Trigger 315630: Swift/UVOT Upper Limits
  69. GRB 080702A: Swift-XRT Team refined analysis
  70. GRB 080702B : Burst detected in BAT during Swift slew
  71. GRB 080702A: Enhanced Swift-XRT position
  72. Swift Trigger 315630: TLS R-band observation
  73. Swift Trigger 315630: Probably not a GRB
  74. GRB 080702: Swift detection of a short burst
  75. GRB 080701: Swift-XRT refined analysis
  76. GRB 080701A, VATT optical upper limit
  77. TLS I-Band Observation of GRB 080701A
  78. GRB 080701A: Swift/UVOT Upper Limits
  79. GRB 080701A: Early Super-LOTIS Observations
  80. GRB 080701: Enhanced Swift-XRT position
  81. Trigger 315630: Swift detection of a possible burst
  82. GRB 080701: Swift-XRT Prompt Analysis
  83. GRB 080701: Swift detection of a burst
  84. GRB 080625: Further observations from OSN
  85. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  86. GRB 080625: Observations at OSN
  87. GRB 080625: Gamma Ray Burst Localization by SuperAGILE
  88. GRB 080623: GROND upper limits
  89. GRB080623: Swift UVOT followup observations
  90. GRB 080623: Enhanced Swift-XRT position
  91. GRB 080623: TAROT La Silla observatory optical observations
  92. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  93. GRB 080623: Swift XRT prompt analysis
  94. GRB 080623: Swift detection of a burst
  95. Swift trigger 314975 is not a GRB
  96. Swift-BAT trigger 314975 possible burst
  97. GRB080607: optical observation
  98. GRB 070809: Putative host galaxy and redshift
  99. VLA upper limit on INTEGRAL burst GRB 080613A
  100. GRB080613B: MITSuME upper limits

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