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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"

36791 results found.

  1. Correction to Circular 5314: Circular refers to GRB 060714
  2. GRB060707 possible optical confirmation
  3. Swift trigger 219136 is probably not a GRB
  4. GRB 060714, optical observation
  5. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  6. GRB 060605: SkyNet Optical Limits
  7. GRB060712: P60 Observations
  8. GRB 060712: XRT refined analysis
  9. GRB 060712: Swift/UVOT Upper Limits
  10. GRB060526: optical observations
  11. GRB 060712: XRT refined position
  12. GRB 060712: Refined analysis of the Swift-BAT burst
  13. GRB060712: MASTER optical observation
  14. GRB120706: MASTER optical observation
  15. GRB 060712: Swift detection of a burst
  16. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  17. GRB 060708: PROMPT Optical Limits
  18. GRB 060707: OA fading and redshift
  19. GRB 060708: Swift-XRT refined analysis
  20. GCN 060708: Swift-UVOT Observations
  21. GRB 060708: Refined analysis of the Swift-BAT burst
  22. GCN 060707: Swift-UVOT observations
  23. GRB 060707: Swift-XRT refined analysis
  24. GRB 060708: Swift detection of a burst with an UVOT countpart
  25. GRB060707 possible optical confirmation
  26. GRB 060707: BOOTES-IR optical afterglow candidate
  27. GRB 060707: Refined analysis of the Swift-BAT burst
  28. GRB 060707: BOOTES-IR optical observation
  29. GRB 060707: Swift detection of a burst
  30. GRB 060515: Upper Limit on Host Galaxy
  31. GRB 050223: Magellan redshift
  32. GRB 060614: SMARTS host galaxy observations
  33. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  34. Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109)
  35. GRB 060109: Upper Limit on Host Galaxy
  36. GRB 060105: Upper limit on Host Galaxy
  37. GRB060614: Detection of the host galaxy but no supernova emission
  38. GRB 060614: redshift confirmation
  39. GRB 060614: Redshift
  40. Swift-BAT trigger 215279 is not a GRB
  41. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  42. GRB060614: Optical observations
  43. GRB 060614: spectroscopy
  44. GRB050326: Host Galaxy Candidates
  45. GRB050124: Possible Host Galaxy
  46. GRB050223: Host Galaxy
  47. GRB060512: near IR observations
  48. GRB060526: optical observations
  49. GRB 060614: pseudo-z from spectral parameters of the prompt emission
  50. Konus-Wind observation of GRB 060614
  51. GRB060605: optical observation
  52. The Unusually Long-Lived Afterglow of GRB 060614
  53. GRB 060614: optical observations
  54. GRB 060605, optical observations
  55. GRB 060614, SMARTS optical/IR afterglow observation
  56. GRB060614: SSO 1m observations
  57. GRB060614: Watcher observation
  58. GRB 060614: Swift-BAT refined analysis
  59. GRB 060614: Swift/UVOT Observations
  60. GRB 060604, optical observations
  61. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  62. GRB 060602A: Swift/XRT analysis
  63. GRB 060610: KAIT observations
  64. GRB 060607: RTT150 optical observations
  65. GRB 070706B: Watcher upper limit
  66. GRB 060607B: Swift-BAT Refined Analysis
  67. GRB 060607B: Swift detection of a burst
  68. GCN 060607: Swift-UVOT obswervations.
  69. GRB 060607: Swift-BAT Refined Analysis
  70. GRB 060607: optical limit by "Pi of the Sky"
  71. GRB 060607: Swift-XRT Team refined analysis
  72. GRB 060607: IR observations
  73. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  74. VLT/UVES observations of GRB 060607
  75. GRB 060607: PROMPT Observations
  76. GRB 060605: RTT150 optical observations
  77. GRB 060607: REM NIR afterglow
  78. GRB 060607: Swift detection of a burst with bright optical counterpart
  79. GRB 060522: PROMPT Optical Limits
  80. GRB 060605 BAT refined analysis
  81. GRB 060605: Xinglong TNT optical observations
  82. GRB060602B : REM infrared observations
  83. GRB060605: Swift/UVOT detections
  84. GRB 060605: Swift-XRT Team refined analysis
  85. SALT spectroscopy of GRB 060605
  86. GRB 060605: TNG optical observations
  87. GRB 060605: RTT150 optical observations
  88. GRB 060605: ROTSE-III Optical Counterpart
  89. GRB 060605: Swift detection of a burst with optical counterpart
  90. GRB 060605: ROTSE-III Detection of Optical Counterpart
  91. GRB 060604: redshift
  92. GRB 060512: Keck Redshift
  93. GRB 060604 optical photometry
  94. GRB 060604: Swift-XRT Team refined analysis
  95. GRB 060604: BAT refined analysis
  96. GRB 060604A: ROTSE-III Optical Limits
  97. GRB 060604: Swift detection of a burst with possible optical counterpart
  98. GRB 060602A: Swift-BAT Refined Analysis: Correction
  99. GRB 060602B: XMM-Newton Survey Source
  100. GRB 060602B: Swift-XRT Refined Analysis

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