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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"

32531 results found.

  1. GRB 060801: Kanazawa Optical Observation
  2. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  3. GRB 060218 / SN 2006aj Nebular Spectrum
  4. GRB 060729 redshift
  5. GRB 060719: TORTOREM optical upper limits
  6. GRB 060729: Swift/UVOT Detections
  7. GRB 060729: Refined analysis of the Swift-BAT burst
  8. GRB 060729: Swift-XRT refined analysis
  9. GRB 060729: Swift/UVOT Observations
  10. GRB 060729: ROTSE-III Detection of Optical Counterpart
  11. GRB 060728: Swift/UVOT Upper Limits
  12. GRB 060728: Refined analysis of the Swift-BAT burst
  13. GRB 060728, SMARTS optical/IR observations
  14. Swift/XRT preliminary analysis
  15. GRB060614 ATCA Radio Limits
  16. GRB 060218 (SN 2006aj): IR afterglow detection six months after the
  17. GRB 060714: Swift/UVOT Observations
  18. GRB060719: prompt NIR observations with REM
  19. GRB 060714: NOT observations
  20. GRB 060719: near-infrared afterglow
  21. GRB 060719: correction to the coordinates reported in GCN 5347
  22. GRB 060522: VLA observation
  23. GRB 060719: Swift/UVOT Upper Limits
  24. GRB 060719: VLT/ISAAC observations
  25. GRB 060719: Refined analysis of the Swift-BAT burst
  26. GRB 060719: XRT refined analysis
  27. GRB 060719: further analysis of VLT observations
  28. GRB 060719: prompt PROMPT observations
  29. GRB060719: REM NIR Observations
  30. GRB 060719: Continued LCO optical observations
  31. GRB 060719: VLT observations
  32. GRB 060717: Swift XRT refined analysis
  33. GRB 060714: OA fading and a possible host detection
  34. GRB 060717: NOT observations
  35. GRB 060714: Refined analysis of the Swift-BAT burst
  36. GRB 060717 optical upper limit
  37. GRB060717: Swift/UVOT upper limits
  38. GRB 060717: Swift XRT refined position
  39. GRB 060717: Swift-BAT refined analysis
  40. GRB060717 - SDSS Pre-burst Observations
  41. GRB 060714: REM infrared observations
  42. GRB 060717, optical observation
  43. GRB060714: correction to GCN 5324
  44. GRB 060714, SMARTS optical/IR afterglow observation
  45. GRB 060714 : Liverpool Telescope Observations
  46. GRB 060714: Swift XRT refined analysis
  47. GRB 060714: OA redshift
  48. GRB 060708: VLT spectroscopy
  49. GRB060708: MARGE low resolution spectrum observations
  50. Swift-BAT trigger 219136 is not a GRB
  51. Correction to Circular 5314: Circular refers to GRB 060714
  52. GRB060707 possible optical confirmation
  53. GRB 060714, optical observation
  54. GRB 060605: SkyNet Optical Limits
  55. GRB060712: P60 Observations
  56. GRB 060712: Swift/UVOT Upper Limits
  57. GRB 060712: Refined analysis of the Swift-BAT burst
  58. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  59. GRB 060708: PROMPT Optical Limits
  60. GRB 060707: OA fading and redshift
  61. GRB 060708: Swift-XRT refined analysis
  62. GCN 060708: Swift-UVOT Observations
  63. GRB 060708: Refined analysis of the Swift-BAT burst
  64. GCN 060707: Swift-UVOT observations
  65. GRB 060707: Swift-XRT refined analysis
  66. GRB060707 possible optical confirmation
  67. GRB 060707: Refined analysis of the Swift-BAT burst
  68. GRB060614: Possible SN Bump in UVOT U Band Light Curve
  69. GRB 060515: Upper Limit on Host Galaxy
  70. GRB 050223: Magellan redshift
  71. GRB 060614: SMARTS host galaxy observations
  72. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  73. Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109)
  74. GRB 060109: Upper Limit on Host Galaxy
  75. GRB 060105: Upper limit on Host Galaxy
  76. GRB060614: Detection of the host galaxy but no supernova emission
  77. GRB 060614: redshift confirmation
  78. GRB 060614: Redshift
  79. Swift-BAT trigger 215279 is not a GRB
  80. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  81. GRB060614: Optical observations
  82. GRB 060614: spectroscopy
  83. GRB050326: Host Galaxy Candidates
  84. GRB050124: Possible Host Galaxy
  85. GRB050223: Host Galaxy
  86. GRB060512: near IR observations
  87. Konus-Wind observation of GRB 060614
  88. GRB060605: optical observation
  89. The Unusually Long-Lived Afterglow of GRB 060614
  90. GRB 060614: optical observations
  91. GRB 060605, optical observations
  92. GRB 060614, SMARTS optical/IR afterglow observation
  93. GRB060614: SSO 1m observations
  94. GRB060614: Watcher observation
  95. GRB 060614: Swift-BAT refined analysis
  96. GRB 060614: Swift/UVOT Observations
  97. GRB060614: Swift-XRT refined analysis
  98. GRB 060604, optical observations
  99. GRB 060602A: Swift/XRT analysis
  100. BAT Trigger #214277 is SGR 1900+14

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