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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"

35989 results found.

  1. Swift trigger 219136 is probably not a GRB
  2. GRB 060714, optical observation
  3. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  4. GRB 060605: SkyNet Optical Limits
  5. GRB060712: P60 Observations
  6. GRB 060712: XRT refined analysis
  7. GRB 060712: Swift/UVOT Upper Limits
  8. GRB060526: optical observations
  9. GRB 060712: XRT refined position
  10. GRB 060712: Refined analysis of the Swift-BAT burst
  11. GRB060712: MASTER optical observation
  12. GRB120706: MASTER optical observation
  13. GRB 060712: Swift detection of a burst
  14. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  15. GRB 060708: PROMPT Optical Limits
  16. GRB 060707: OA fading and redshift
  17. GRB 060708: Swift-XRT refined analysis
  18. GCN 060708: Swift-UVOT Observations
  19. GRB 060708: Refined analysis of the Swift-BAT burst
  20. GCN 060707: Swift-UVOT observations
  21. GRB 060707: Swift-XRT refined analysis
  22. GRB 060708: Swift detection of a burst with an UVOT countpart
  23. GRB060707 possible optical confirmation
  24. GRB 060707: BOOTES-IR optical afterglow candidate
  25. GRB 060707: Refined analysis of the Swift-BAT burst
  26. GRB 060707: BOOTES-IR optical observation
  27. GRB 060707: Swift detection of a burst
  28. GRB 060515: Upper Limit on Host Galaxy
  29. GRB 050223: Magellan redshift
  30. GRB 060614: SMARTS host galaxy observations
  31. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  32. Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109)
  33. GRB 060109: Upper Limit on Host Galaxy
  34. GRB 060105: Upper limit on Host Galaxy
  35. GRB060614: Detection of the host galaxy but no supernova emission
  36. GRB 060614: redshift confirmation
  37. GRB 060614: Redshift
  38. Swift-BAT trigger 215279 is not a GRB
  39. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  40. GRB060614: Optical observations
  41. GRB 060614: spectroscopy
  42. GRB050326: Host Galaxy Candidates
  43. GRB050124: Possible Host Galaxy
  44. GRB050223: Host Galaxy
  45. GRB060512: near IR observations
  46. GRB060526: optical observations
  47. GRB 060614: pseudo-z from spectral parameters of the prompt emission
  48. Konus-Wind observation of GRB 060614
  49. GRB060605: optical observation
  50. The Unusually Long-Lived Afterglow of GRB 060614
  51. GRB 060614: optical observations
  52. GRB 060605, optical observations
  53. GRB 060614, SMARTS optical/IR afterglow observation
  54. GRB060614: SSO 1m observations
  55. GRB060614: Watcher observation
  56. GRB 060614: Swift-BAT refined analysis
  57. GRB 060614: Swift/UVOT Observations
  58. GRB 060604, optical observations
  59. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  60. GRB 060602A: Swift/XRT analysis
  61. GRB 060610: KAIT observations
  62. GRB 060607: RTT150 optical observations
  63. GRB 070706B: Watcher upper limit
  64. GRB 060607B: Swift-BAT Refined Analysis
  65. GRB 060607B: Swift detection of a burst
  66. GCN 060607: Swift-UVOT obswervations.
  67. GRB 060607: Swift-BAT Refined Analysis
  68. GRB 060607: optical limit by "Pi of the Sky"
  69. GRB 060607: Swift-XRT Team refined analysis
  70. GRB 060607: IR observations
  71. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  72. VLT/UVES observations of GRB 060607
  73. GRB 060607: PROMPT Observations
  74. GRB 060605: RTT150 optical observations
  75. GRB 060607: REM NIR afterglow
  76. GRB 060607: Swift detection of a burst with bright optical counterpart
  77. GRB 060522: PROMPT Optical Limits
  78. GRB 060605 BAT refined analysis
  79. GRB 060605: Xinglong TNT optical observations
  80. GRB060602B : REM infrared observations
  81. GRB060605: Swift/UVOT detections
  82. GRB 060605: Swift-XRT Team refined analysis
  83. SALT spectroscopy of GRB 060605
  84. GRB 060605: TNG optical observations
  85. GRB 060605: RTT150 optical observations
  86. GRB 060605: ROTSE-III Optical Counterpart
  87. GRB 060605: Swift detection of a burst with optical counterpart
  88. GRB 060605: ROTSE-III Detection of Optical Counterpart
  89. GRB 060604: redshift
  90. GRB 060512: Keck Redshift
  91. GRB 060604 optical photometry
  92. GRB 060604: Swift-XRT Team refined analysis
  93. GRB 060604: BAT refined analysis
  94. GRB 060604A: ROTSE-III Optical Limits
  95. GRB 060604: Swift detection of a burst with possible optical counterpart
  96. GRB 060602A: Swift-BAT Refined Analysis: Correction
  97. GRB 060602B: XMM-Newton Survey Source
  98. GRB 060602B: Swift-XRT Refined Analysis
  99. GRB 060602B: Swift-BAT Refined Analysis
  100. GRB 060602B: Swift/UVOT observations

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