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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"

18354 results found.

  1. GRB 070704: Swift-XRT refined analysis
  2. Swift/UVOT Observations of GRB070704
  3. GRB 070704: Correction to GCN Circ 6594
  4. GRB 070704: Swift detection of a burst
  5. GRB 070628 Swift-UVOT Refined Analysis
  6. GRB 070628: NIR detection of afterglow
  7. GRB 070628: TAROT La Silla observatory optical observations
  8. GRB 070616 : WIDGET simultaneous optical observations
  9. GRB070621: RTT150 optical observations
  10. GRB 070621: VLT optical observations
  11. GRB 070621: Swift/UVOT Upper Limits
  12. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  13. GRB 070621: Gemini South optical imaging
  14. GRB 070621: UVOT-enhanced XRT position
  15. Observations of GRB070612A at Calar Alto
  16. GRB 070621: NOT observations
  17. GRB 070621: TAROT Calern observatory optical observations
  18. GRB 070621: Watcher Observations
  19. GRB 070621: Swift detection of a burst
  20. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  21. Swift/UVOT detection of GRB070616 optical afterglow.
  22. GRB070616: Optical Observation by MITSuME Okayama
  23. GRB 070616: TLS observation
  24. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  25. GRB 070616: Swift detection of a burst
  26. GRB 070612B: optical observations
  27. UVOT Observations of INTEGRAL burst GRB070615
  28. VLA upper limit on GRB 070610
  29. GRB 070615
  30. SWIFT J195509.6+261406 (GRB 070610): further observations
  31. GRB 070612A: Super-LOTIS observations
  32. GRB 070612A: Rapid Decay
  33. GRB070612A: MITSuME Okayama Observation
  34. GRB 070612A: continued SARA observations
  35. GRB 070611: Watcher Observations
  36. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  37. GRB 070612B: SARA upper limit
  38. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  39. GRB 070612B: Swift/UVOT upper limits
  40. GRB 070612B: FRAM limit
  41. GRB070612B: P60 Observations
  42. GRB 070612A: SARA detection of possible OT
  43. GRB 070610: TAROT Calern observatory optical observations
  44. GRB 070610: MITSuME OAO optical upper limit
  45. GRB070612 - SDSS Pre-Burst Observations
  46. GRB 070610: SARA upper limit
  47. GRB 070610: Swift-XRT refined analysis
  48. GRB 070611: Swift/UVOT Observations
  49. GRB 070610: Optical observations from OSN
  50. GRB 070610: Watcher Observations
  51. GRB 070611: ROTSE-III Optical Limits
  52. GRB 070610: Swift-UVOT Upper Limits
  53. GRB 070412: TAROT Calern observatory optical observations
  54. GRB 070411: TAROT Calern observatory optical observations
  55. GRB 070531: NOT nIR observations
  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: Xinglong TNT Optical Upper Limit
  62. GRB 070529: Swift detection of a burst with an optical aterglow
  63. GRB 070412: Deep Keck imaging
  64. Swift trigger 280447 is probably a Galactic transient
  65. GRB070521: Second Epoch Gemini Imaging
  66. GRB 070521: Swift/UVOT Upper Limits
  67. GRB 070521, optical observation
  68. GRB 070521: Swift-XRT refined analysis
  69. GRB 070521: Keck imaging
  70. GRB070521: Gemini Observations
  71. GROND upper limits of GRB 070521
  72. GRB 070520B: SARA upper limit
  73. GRB 070520A: SARA upper limit
  74. GRB 070521: SARA upper limit
  75. GRB 070521: Subaru observations and possible host detection
  76. GRB 070520B: Swift/UVOT Upper Limits
  77. GRB 070520A: Subaru Observations
  78. GRB 070520A: Swift UVOT Upper Limits
  79. GRB 070520B: Swift-XRT refined analysis
  80. GRB 070521: TAROT La Silla observatory optical observations
  81. GRB070521 - SDSS Pre-Burst Observations
  82. GRB 070521: Swift detection of a burst
  83. GRB 070520A: MITSuME Akeno optical upper limits
  84. GRB 070520A: Swift-XRT refined analysis
  85. GRB 070518: TNG observations
  86. GRB 070520B: Swift detection of a burst
  87. GRB 070520: Xinglong EST optical Upper Limit
  88. GRB 070520: Swift detection of a burst
  89. VLA observation of GRB 070518
  90. GRB070518: UVOT refined analysis
  91. GRB 070518: OT confirmed form Xinglong TNT observation
  92. GRB 070518: Swift detection of a burst with optical afterglow
  93. GRB 070517: Swift detection of a burst
  94. GRB 070509: objects inside XRT error circle
  95. GRB 070512: IPN localization and Konus spectrum of a bright burst
  96. GRB 070509: Swift/UVOT Upper Limits
  97. GRB 070509: REM observations
  98. GRB 070508: REM observations
  99. GRB 070508: TAROT La Silla observatory optical observations
  100. GRB 070508: Swift detection of an intense burst with an optical counterpart

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