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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"

26374 results found.

  1. Swift/UVOT detection of GRB070616 optical afterglow.
  2. GRB 070612A: NOT observations
  3. GRB070616: Optical Observation by MITSuME Okayama
  4. GRB 070616, Swift-BAT further refined analysis
  5. GRB 070616: BTA optical observations
  6. GRB 070616: TLS observation
  7. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  8. GRB 070616: Swift detection of a burst
  9. GRB 070612B: optical observations
  10. UVOT Observations of INTEGRAL burst GRB070615
  11. VLA upper limit on GRB 070610
  12. GRB 070615
  13. SWIFT J195509.6+261406 (GRB 070610): further observations
  14. GRB 070612A: Super-LOTIS observations
  15. GRB 070612A: Rapid Decay
  16. GRB 070612A: Suzaku/WAM observation of the prompt emission
  17. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  18. GRB070612A: MITSuME Okayama Observation
  19. GRB 070612A: continued SARA observations
  20. GRB 070611: Watcher Observations
  21. Swift Trigger 282176 is Cygnus X-1
  22. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  23. GRB 070612B: SARA upper limit
  24. GRB 070612B, Swift-BAT refined analysis
  25. GRB 070612A, Swift-BAT refined analysis
  26. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  27. GRB 070612B: Swift/UVOT upper limits
  28. GRB 070612B: FRAM limit
  29. GRB070612B: P60 Observations
  30. GRB 070612A: SARA detection of possible OT
  31. GRB 070610: TAROT Calern observatory optical observations
  32. GRB 070610: MITSuME OAO optical upper limit
  33. GRB070612 - SDSS Pre-Burst Observations
  34. GRB 070612: Swift detection of a burst
  35. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  36. GRB 070610: SARA upper limit
  37. GRB 070610: Swift-XRT refined analysis
  38. GRB 070611: Swift/UVOT Observations
  39. GRB 070611: Swift-XRT refined analysis
  40. GRB 070611, Swift-BAT refined analysis
  41. GRB 070610: Optical observations from OSN
  42. GRB 070610: Watcher Observations
  43. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  44. GRB 070611: ROTSE-III Optical Limits
  45. GRB 070610: Swift-UVOT Upper Limits
  46. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  47. GRB 070610, Swift-BAT refined analysis
  48. GRB 070412: TAROT Calern observatory optical observations
  49. GRB 070411: TAROT Calern observatory optical observations
  50. GRB070520B: optical observations
  51. GRB070520: optical observation
  52. GRB070518: optical observation
  53. GRB070521: optical observation
  54. GRB 070531: NOT nIR observations
  55. GRB 070531: Swift-BAT refined analysis
  56. GRB 070531: I-band observations from IAC80
  57. GRB 070531: Liverpool Telescope Optical Observations
  58. GRB 070529: SARA upper limit
  59. Swift/UVOT refined analysis of GRB070529
  60. GRB 070529: Optical aterglow from MIRO
  61. GRB 070529: Swift-XRT refined analysis
  62. GRB 070529, Swift-BAT refined analysis
  63. GRB 070529: Xinglong TNT Optical Upper Limit
  64. GRB 070529: Swift detection of a burst with an optical aterglow
  65. GRB 070412: Deep Keck imaging
  66. Swift trigger 280447 is probably a Galactic transient
  67. GRB 070518, deep LBT photometry
  68. Konus-Wind observation of GRB 070521
  69. GRB070521: Second Epoch Gemini Imaging
  70. GRB 070521: Swift/UVOT Upper Limits
  71. GRB 070521, optical observation
  72. GRB 070521: Swift-XRT refined analysis
  73. GRB 070521: Keck imaging
  74. GRB070521: Gemini Observations
  75. GROND upper limits of GRB 070521
  76. GRB 070520B: SARA upper limit
  77. GRB 070520A: SARA upper limit
  78. GRB 070521: SARA upper limit
  79. GRB 070521: Subaru observations and possible host detection
  80. GRB 070520B: Swift/UVOT Upper Limits
  81. GRB 070520A: Subaru Observations
  82. GRB 070521, Swift-BAT refined analysis
  83. GRB 070520A: Swift UVOT Upper Limits
  84. GRB 070520B: Swift-XRT refined analysis
  85. GRB 070521: TAROT La Silla observatory optical observations
  86. GRB070521 - SDSS Pre-Burst Observations
  87. GRB 070521: Swift detection of a burst
  88. GRB 070520A: MITSuME Akeno optical upper limits
  89. GRB 070520B, Swift-BAT refined analysis
  90. GRB 070520A, Swift-BAT refined analysis
  91. GRB 070520A: Swift-XRT refined analysis
  92. GRB 070518: TNG observations
  93. GRB 070520B: Swift detection of a burst
  94. GRB 070520: Xinglong EST optical Upper Limit
  95. GRB 070520: Swift detection of a burst
  96. VLA observation of GRB 070518
  97. GRB 070518: Swift-XRT refined analysis
  98. GRB070518: UVOT refined analysis
  99. GRB 070518, Swift-BAT refined analysis
  100. GRB 070518: OT confirmed form Xinglong TNT observation

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