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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"

32532 results found.

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

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