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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"

22197 results found.

  1. GRB070612A: MITSuME Okayama Observation
  2. GRB 070612A: continued SARA observations
  3. GRB 070612A: spectral lag
  4. GRB 070611: Watcher Observations
  5. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  6. GRB 070612B: SARA upper limit
  7. GRB 070612B: Swift-XRT refined analysis
  8. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  9. GRB 070612B: Swift/UVOT upper limits
  10. GRB 070612B: FRAM limit
  11. GRB070612B: P60 Observations
  12. GRB 070612A: SARA detection of possible OT
  13. GRB 070610: TAROT Calern observatory optical observations
  14. GRB 070610: MITSuME OAO optical upper limit
  15. GRB 070612B: Swift detection of a burst
  16. GRB070612 - SDSS Pre-Burst Observations
  17. GRB 070612: Swift detection of a burst
  18. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  19. GRB 070610: SARA upper limit
  20. GRB 070610: Swift-XRT refined analysis
  21. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  22. GRB 070611: Swift/UVOT Observations
  23. GRB 070611: Swift-XRT refined analysis
  24. GRB 070610: Optical observations from OSN
  25. GRB 070610: Watcher Observations
  26. GRB 070611: ROTSE-III Optical Limits
  27. GRB 070611: Swift detection of a burst
  28. GRB 070610: Swift-UVOT Upper Limits
  29. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  30. GRB 070610: Swift detection of a burst
  31. GRB 070412: TAROT Calern observatory optical observations
  32. GRB 070411: TAROT Calern observatory optical observations
  33. Swift/UVOT refined analysis of GRB070531
  34. GRB 070531: NOT nIR observations
  35. GRB 070531: I-band observations from IAC80
  36. GRB 070531: Liverpool Telescope Optical Observations
  37. GRB 070531: Swift detection of a burst
  38. GRB 070529: SARA upper limit
  39. Swift/UVOT refined analysis of GRB070529
  40. GRB 070529: Optical aterglow from MIRO
  41. GRB 070529: Swift-XRT refined analysis
  42. GRB 070529, Swift-BAT refined analysis
  43. GRB 070529: Xinglong TNT Optical Upper Limit
  44. GRB 070529: Swift detection of a burst with an optical aterglow
  45. GRB 070412: Deep Keck imaging
  46. Swift trigger 280447 is probably a Galactic transient
  47. GRB070521: Second Epoch Gemini Imaging
  48. GRB 070521: Swift/UVOT Upper Limits
  49. GRB 070521, optical observation
  50. GRB 070521: Swift-XRT refined analysis
  51. GRB 070521: Keck imaging
  52. GRB070521: Gemini Observations
  53. GROND upper limits of GRB 070521
  54. GRB 070520B: SARA upper limit
  55. GRB 070520A: SARA upper limit
  56. GRB 070521: SARA upper limit
  57. GRB 070521: Subaru observations and possible host detection
  58. GRB 070520B: Swift/UVOT Upper Limits
  59. GRB 070520A: Subaru Observations
  60. GRB 070520A: Swift UVOT Upper Limits
  61. GRB 070520B: Swift-XRT refined analysis
  62. GRB070521 : Faulkes Telescope North Observations
  63. GRB 070521: TAROT La Silla observatory optical observations
  64. GRB070521 - SDSS Pre-Burst Observations
  65. GRB 070521: Swift detection of a burst
  66. GRB 070520A: MITSuME Akeno optical upper limits
  67. GRB 070520A, Swift-BAT refined analysis
  68. GRB 070518: TNG observations
  69. GRB 070520B: Swift detection of a burst
  70. GRB 070520: Xinglong EST optical Upper Limit
  71. GRB 070520: Swift detection of a burst
  72. VLA observation of GRB 070518
  73. GRB070518: UVOT refined analysis
  74. GRB 070518: OT confirmed form Xinglong TNT observation
  75. GRB 070518: Swift detection of a burst with optical afterglow
  76. GRB 070517: Swift detection of a burst
  77. GRB 070509: objects inside XRT error circle
  78. GRB 070512: IPN localization and Konus spectrum of a bright burst
  79. GRB 070509: Swift/UVOT Upper Limits
  80. GRB 070510: Swift detection of a possible burst
  81. GRB 070508: OA fading and tentative redshift
  82. GRB 070509: REM observations
  83. GRB 070509: Swift detection of a burst
  84. GRB 070509: ROTSE-III Optical Limits
  85. GRB 070508: REM observations
  86. GRB 070508: TAROT La Silla observatory optical observations
  87. GRB 070508: Swift detection of an intense burst with an optical counterpart
  88. GRB 070507: Swift detection of a possible cosmic ray shower event or a possible burst
  89. GRB070506: Swift/UVOT Observations
  90. GRB 070506: Swift detection of a burst with optical afterglow
  91. GRB 070412, deep LBT imaging
  92. GRB070429B: VLT observations
  93. GRB070429B: position correction
  94. GRB 070309: Swift-XRT afterglow confirmation
  95. VLA observation of GRB 070429B
  96. Swift/UVOT observations of GRB070429B
  97. GRB 070429B, Swift-BAT refined analysis
  98. Swift/UVOT observations of GRB070429A
  99. GRB 070429A: optical and NIR observations
  100. GRB 070429B: ROTSE-III Optical Limits

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