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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"

18335 results found.

  1. GRB 080804: Swift detection of a burst with optical afterglow
  2. GRB 080802: Swift/UVOT Upper Limits
  3. GRB 080802: UVI Telescope Upper Limit
  4. GRB 080802: Swift detection of a probable burst
  5. GRB 080727B: IR photometry
  6. GRB 080727C: TAROT Calern observatory optical observations
  7. GRB 080727B: KAIT photometry and an early lightcurve break
  8. GRB 080727C: Swift/UVOT Upper Limits
  9. Konus-Wind observation of GRB 080727B
  10. GRB 080727C: Liverpool Telescope observations
  11. GRB 080727A: VLT upper limits
  12. GRB 080727C: Enhanced Swift-XRT position
  13. GRB080727C: RTT150 optical observations
  14. GRB 080727C: Swift detection of a burst
  15. Swift detection of XTE J1701-407
  16. GRB 080727B: Swift/UVOT Upper Limits
  17. GRB080727A: Swift/UVOT Upper Limits
  18. GRB 080727B: Enhanced Swift-XRT position
  19. GRB 080727A: Enhanced Swift-XRT position
  20. GRB 080727B: REM prompt observations
  21. GRB 080727B: Swift detection of a bright burst
  22. GRB 080727: Swift detection of a burst
  23. GRB 080723A: optical upper limit
  24. GRB080723B: Swift/UVOT Upper Limits
  25. GRB 080725: REM prompt observations
  26. GRB 080723A: Swift/UVOT Upper Limits
  27. VLA radio upper limit on GRB 080721
  28. GRB 080723B - Swift-XRT refined analysis
  29. GRB 080723, Swift-BAT refined analysis
  30. GRB 080723: Enhanced Swift-XRT position
  31. GRB 080723: Swift detection of a burst
  32. GRB 080721: Swift-XRT refined analysis
  33. GRB 080721: Enhanced Swift-XRT position
  34. GRB 080721: Swift detection of a burst with a bright optical counterpart.
  35. Trigger 317393: Swift detection of a possible GRB
  36. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  37. GRB 080714: GROND confirmation of the optical/NIR afterglow
  38. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  39. GRB 080714: Enhanced Swift-XRT position
  40. GRB 080714: Swift-BAT refined analysis
  41. GRB 080714: Swift detection of a burst
  42. GRB 080702A: optical upper limit
  43. GRB 080603A: CrAO optical observations
  44. GRB 080702B: Swift XRT confirmation of the afterglow
  45. GRB 080710: Lick IR detection
  46. GRB 080710: Rapid PROMPT Observations
  47. GRB 080710: Swift-XRT refined analysis
  48. GRB080710: Swift/UVOT observations
  49. GRB 080710: Enhanced Swift-XRT position
  50. UVOT white band observations of GRB080710
  51. GRB 080710: REM afterglow confirmation & brightening
  52. GRB 080710: Swift XRT position
  53. GRB 080707: possible break in the X-rays
  54. GRB 080707: GROND Confirmation of the Optical Afterglow
  55. UVOT observations of GRB080707
  56. GRB 080707: Swift XRT refined analysis
  57. GRB 080707: Enhanced Swift-XRT position
  58. GRB 080707: VLT redshift
  59. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  60. GRB 080707: Swift detection of a burst
  61. Trigger 316063: Swift detection of a transient
  62. GRB 080703: GROND Upper Limits
  63. GRB 080702B: GROND Upper Limits
  64. GRB 080703: VLT observations of the afterglow
  65. GRB 080703: Enhanced Swift-XRT position
  66. GRB 080703: Swift detection of a burst with optical afterglow
  67. No radio detection from the short GRB 080702A
  68. Swift/UVOT observation of GRB080702A
  69. GRB 080702B: Swift XRT and UVOT observations
  70. GRB 080701A: Early RAPTOR optical limits
  71. Swift Trigger 315630: Swift/UVOT Upper Limits
  72. GRB 080702B : Burst detected in BAT during Swift slew
  73. GRB 080702A: Enhanced Swift-XRT position
  74. Swift Trigger 315630: TLS R-band observation
  75. Swift Trigger 315630: Probably not a GRB
  76. GRB 080702: Swift detection of a short burst
  77. GRB 080701A, VATT optical upper limit
  78. TLS I-Band Observation of GRB 080701A
  79. GRB 080701A: Swift/UVOT Upper Limits
  80. GRB 080701: Enhanced Swift-XRT position
  81. GRB 080701A, Swift-BAT refined analysis
  82. Trigger 315630: Swift detection of a possible burst
  83. GRB 080701: Swift-XRT Prompt Analysis
  84. GRB 080625: Further observations from OSN
  85. GRB 080625: Observations at OSN
  86. GRB 080623: GROND upper limits
  87. GRB 080623: Enhanced Swift-XRT position
  88. GRB 080623: TAROT La Silla observatory optical observations
  89. GRB 080623: Swift XRT prompt analysis
  90. Swift-BAT trigger 314975 possible burst
  91. GRB080607: optical observation
  92. GRB 070809: Putative host galaxy and redshift
  93. VLA upper limit on INTEGRAL burst GRB 080613A
  94. GRB080613B: MITSuME upper limits
  95. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  96. GRB 080603A: optical observations on June 04
  97. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  98. GRB 080613B: GROND Upper Limits
  99. GRB 080613B - NOT optical and IR nondetections
  100. GRB 080613B: Swift-XRT refined analysis

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