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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"

26364 results found.

  1. VLA upper limit on GRB 070610
  2. GRB 070615
  3. SWIFT J195509.6+261406 (GRB 070610): further observations
  4. GRB 070612A: Super-LOTIS observations
  5. GRB 070612A: Rapid Decay
  6. GRB 070612A: Suzaku/WAM observation of the prompt emission
  7. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  8. GRB070612A: MITSuME Okayama Observation
  9. GRB 070612A: continued SARA observations
  10. GRB 070611: Watcher Observations
  11. Swift Trigger 282176 is Cygnus X-1
  12. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  13. GRB 070612B: SARA upper limit
  14. GRB 070612B, Swift-BAT refined analysis
  15. GRB 070612A, Swift-BAT refined analysis
  16. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  17. GRB 070612B: Swift/UVOT upper limits
  18. GRB 070612B: FRAM limit
  19. GRB070612B: P60 Observations
  20. GRB 070612A: SARA detection of possible OT
  21. GRB 070610: TAROT Calern observatory optical observations
  22. GRB 070610: MITSuME OAO optical upper limit
  23. GRB070612 - SDSS Pre-Burst Observations
  24. GRB 070612: Swift detection of a burst
  25. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  26. GRB 070610: SARA upper limit
  27. GRB 070610: Swift-XRT refined analysis
  28. GRB 070611: Swift/UVOT Observations
  29. GRB 070611: Swift-XRT refined analysis
  30. GRB 070611, Swift-BAT refined analysis
  31. GRB 070610: Optical observations from OSN
  32. GRB 070610: Watcher Observations
  33. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  34. GRB 070611: ROTSE-III Optical Limits
  35. GRB 070610: Swift-UVOT Upper Limits
  36. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  37. GRB 070610, Swift-BAT refined analysis
  38. GRB 070412: TAROT Calern observatory optical observations
  39. GRB 070411: TAROT Calern observatory optical observations
  40. GRB070520B: optical observations
  41. GRB070520: optical observation
  42. GRB070518: optical observation
  43. GRB070521: optical observation
  44. GRB 070531: NOT nIR observations
  45. GRB 070531: Swift-BAT refined analysis
  46. GRB 070531: I-band observations from IAC80
  47. GRB 070531: Liverpool Telescope Optical Observations
  48. GRB 070529: SARA upper limit
  49. Swift/UVOT refined analysis of GRB070529
  50. GRB 070529: Optical aterglow from MIRO
  51. GRB 070529: Swift-XRT refined analysis
  52. GRB 070529, Swift-BAT refined analysis
  53. GRB 070529: Xinglong TNT Optical Upper Limit
  54. GRB 070529: Swift detection of a burst with an optical aterglow
  55. GRB 070412: Deep Keck imaging
  56. Swift trigger 280447 is probably a Galactic transient
  57. GRB 070518, deep LBT photometry
  58. Konus-Wind observation of GRB 070521
  59. GRB070521: Second Epoch Gemini Imaging
  60. GRB 070521: Swift/UVOT Upper Limits
  61. GRB 070521, optical observation
  62. GRB 070521: Swift-XRT refined analysis
  63. GRB 070521: Keck imaging
  64. GRB070521: Gemini Observations
  65. GROND upper limits of GRB 070521
  66. GRB 070520B: SARA upper limit
  67. GRB 070520A: SARA upper limit
  68. GRB 070521: SARA upper limit
  69. GRB 070521: Subaru observations and possible host detection
  70. GRB 070520B: Swift/UVOT Upper Limits
  71. GRB 070520A: Subaru Observations
  72. GRB 070521, Swift-BAT refined analysis
  73. GRB 070520A: Swift UVOT Upper Limits
  74. GRB 070520B: Swift-XRT refined analysis
  75. GRB 070521: TAROT La Silla observatory optical observations
  76. GRB070521 - SDSS Pre-Burst Observations
  77. GRB 070521: Swift detection of a burst
  78. GRB 070520A: MITSuME Akeno optical upper limits
  79. GRB 070520B, Swift-BAT refined analysis
  80. GRB 070520A, Swift-BAT refined analysis
  81. GRB 070520A: Swift-XRT refined analysis
  82. GRB 070518: TNG observations
  83. GRB 070520B: Swift detection of a burst
  84. GRB 070520: Xinglong EST optical Upper Limit
  85. GRB 070520: Swift detection of a burst
  86. VLA observation of GRB 070518
  87. GRB 070518: Swift-XRT refined analysis
  88. GRB070518: UVOT refined analysis
  89. GRB 070518, Swift-BAT refined analysis
  90. GRB 070518: OT confirmed form Xinglong TNT observation
  91. GRB 070518: Swift detection of a burst with optical afterglow
  92. GRB070517: Swift-XRT Refined Analysis
  93. GRB 070517, Swift-BAT refined analysis
  94. GRB 070517: Optical search
  95. GRB 070517: Swift detection of a burst
  96. GRB 070509: objects inside XRT error circle
  97. GRB 070512: IPN localization and Konus spectrum of a bright burst
  98. GRB070419A: optical observations
  99. GRB 070509: Swift/UVOT Upper Limits
  100. Konus-Wind and Konus-A observation of GRB 070508

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