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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"

19809 results found.

  1. GRB 080804: Enhanced Swift-XRT position
  2. GRB 080804: Faulkes Telescope South observations
  3. GRB080805 optical limit by "Pi of the Sky"
  4. GRB 080805: Afterglow confirmation
  5. GRB 080805: GROND detection of possible afterglow
  6. GRB 080805: Swift detection of a burst
  7. GRB 080804: Swift detection of a burst with optical afterglow
  8. GRB 080802: Swift/UVOT Upper Limits
  9. GRB 080802: UVI Telescope Upper Limit
  10. GRB 080802: Swift detection of a probable burst
  11. GRB 080727B: IR photometry
  12. GRB 080727C: TAROT Calern observatory optical observations
  13. GRB 080727B: KAIT photometry and an early lightcurve break
  14. GRB 080727C: Swift/UVOT Upper Limits
  15. GRB 080727C: Liverpool Telescope observations
  16. GRB 080727A: VLT upper limits
  17. GRB 080727C: Enhanced Swift-XRT position
  18. GRB080727C: RTT150 optical observations
  19. GRB 080727C: Swift detection of a burst
  20. Swift detection of XTE J1701-407
  21. GRB 080727B: Swift/UVOT Upper Limits
  22. GRB080727A: Swift/UVOT Upper Limits
  23. GRB 080727B: Enhanced Swift-XRT position
  24. GRB 080727A: Enhanced Swift-XRT position
  25. GRB 080727B: REM prompt observations
  26. GRB 080727B: Swift detection of a bright burst
  27. GRB 080727: Swift detection of a burst
  28. GRB 080726: GRB Localization by SuperAGILE
  29. GRB 080723A: optical upper limit
  30. GRB080723B: Swift/UVOT Upper Limits
  31. GRB 080725: REM prompt observations
  32. GRB 080723A: Swift/UVOT Upper Limits
  33. VLA radio upper limit on GRB 080721
  34. GRB 080723, Swift-BAT refined analysis
  35. GRB 080723: Enhanced Swift-XRT position
  36. GRB 080723: Swift detection of a burst
  37. GRB 080721: Enhanced Swift-XRT position
  38. GRB 080721, Swift-BAT refined analysis
  39. GRB 080721: Swift detection of a burst with a bright optical counterpart.
  40. Trigger 317393: Swift detection of a possible GRB
  41. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  42. GRB 080714: GROND confirmation of the optical/NIR afterglow
  43. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  44. GRB 080714: Enhanced Swift-XRT position
  45. GRB 080714: Swift-BAT refined analysis
  46. GRB 080714: Swift detection of a burst
  47. GRB 080702A: optical upper limit
  48. GRB 080603A: CrAO optical observations
  49. GRB 080710: TLS observations, steepening afterglow decay
  50. GRB 080702B: Swift XRT confirmation of the afterglow
  51. GRB 080710: Lick IR detection
  52. GRB 080710: Swift-XRT refined analysis
  53. GRB080710: Swift/UVOT observations
  54. GRB 080710: Enhanced Swift-XRT position
  55. UVOT white band observations of GRB080710
  56. GRB 080710: REM afterglow confirmation & brightening
  57. GRB 080710: Swift XRT position
  58. GRB 080707: GROND Confirmation of the Optical Afterglow
  59. UVOT observations of GRB080707
  60. GRB 080707, Swift-BAT refined analysis
  61. GRB 080707: Swift XRT refined analysis
  62. GRB 080707: Enhanced Swift-XRT position
  63. GRB 080707: VLT redshift
  64. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  65. GRB 080707: Swift detection of a burst
  66. Trigger 316063: Swift detection of a transient
  67. GRB 080703: GROND Upper Limits
  68. GRB 080702B: GROND Upper Limits
  69. GRB 080703: VLT observations of the afterglow
  70. GRB 080703: Enhanced Swift-XRT position
  71. GRB 080703, Swift-BAT refined analysis
  72. GRB 080702B Swift-BAT refined analysis
  73. GRB 080703: Swift detection of a burst with optical afterglow
  74. No radio detection from the short GRB 080702A
  75. Swift/UVOT observation of GRB080702A
  76. GRB 080702B: Swift XRT and UVOT observations
  77. GRB 080701A: Early RAPTOR optical limits
  78. Swift Trigger 315630: Swift/UVOT Upper Limits
  79. GRB 080702B : Burst detected in BAT during Swift slew
  80. GRB 080702A: Enhanced Swift-XRT position
  81. Swift Trigger 315630: TLS R-band observation
  82. Swift Trigger 315630: Probably not a GRB
  83. GRB 080702: Swift detection of a short burst
  84. GRB 080701A, VATT optical upper limit
  85. TLS I-Band Observation of GRB 080701A
  86. GRB 080701A: Swift/UVOT Upper Limits
  87. GRB 080701: Enhanced Swift-XRT position
  88. Trigger 315630: Swift detection of a possible burst
  89. GRB 080701: Swift-XRT Prompt Analysis
  90. GRB 080625: Further observations from OSN
  91. GRB 080625:Swift-XRT detection of the afterglow
  92. GRB 080625: Observations at OSN
  93. GRB 080623: GROND upper limits
  94. GRB 080623: Enhanced Swift-XRT position
  95. GRB 080623: TAROT La Silla observatory optical observations
  96. GRB 080623: Swift XRT prompt analysis
  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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