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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"

19866 results found.

  1. Konus-Wind observation of GRB 070626
  2. GRB 070704: Swift-XRT refined analysis
  3. Swift/UVOT Observations of GRB070704
  4. GRB 070704: Correction to GCN Circ 6594
  5. GRB 070704: Swift detection of a burst
  6. GRB 070626: Suzaku/WAM observation of the prompt emission
  7. GRB 070626: IPN localization and Konus spectrum of a bright long burst
  8. GRB 070628 Swift-UVOT Refined Analysis
  9. GRB 070628: NIR detection of afterglow
  10. GRB 070628: TAROT La Silla observatory optical observations
  11. INTEGRAL burst GRB070615: X-ray continued observations
  12. GRB 070616 : WIDGET simultaneous optical observations
  13. GRB070621: RTT150 optical observations
  14. GRB 070621: VLT optical observations
  15. GRB 070621: Swift/UVOT Upper Limits
  16. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  17. WHT observations of GRB070621
  18. GRB 070621: Gemini South optical imaging
  19. GRB 070621: UVOT-enhanced XRT position
  20. Observations of GRB070612A at Calar Alto
  21. GRB 070621: NOT observations
  22. GRB070621: OPTIMA-Burst optical upper limit
  23. GRB 070621: TAROT Calern observatory optical observations
  24. GRB 070621: Watcher Observations
  25. GRB 070621: Swift detection of a burst
  26. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  27. Swift/UVOT detection of GRB070616 optical afterglow.
  28. GRB070616: Optical Observation by MITSuME Okayama
  29. GRB 070616: TLS observation
  30. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  31. GRB 070616: Swift detection of a burst
  32. GRB 070612B: optical observations
  33. UVOT Observations of INTEGRAL burst GRB070615
  34. VLA upper limit on GRB 070610
  35. GRB 070615
  36. SWIFT J195509.6+261406 (GRB 070610): further observations
  37. GRB 070612A: Super-LOTIS observations
  38. GRB 070612A: Rapid Decay
  39. GRB 070612A: Suzaku/WAM observation of the prompt emission
  40. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  41. GRB070612A: MITSuME Okayama Observation
  42. GRB 070612A: continued SARA observations
  43. GRB 070611: Watcher Observations
  44. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  45. GRB 070612B: SARA upper limit
  46. GRB 070612B: Swift-XRT refined analysis
  47. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  48. GRB 070612B: Swift/UVOT upper limits
  49. GRB 070612B: FRAM limit
  50. GRB070612B: P60 Observations
  51. GRB 070612A: SARA detection of possible OT
  52. GRB 070610: TAROT Calern observatory optical observations
  53. GRB 070610: MITSuME OAO optical upper limit
  54. GRB070612 - SDSS Pre-Burst Observations
  55. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  56. GRB 070610: SARA upper limit
  57. GRB 070610: Swift-XRT refined analysis
  58. GRB 070611: Swift/UVOT Observations
  59. GRB 070610: Optical observations from OSN
  60. GRB 070610: Watcher Observations
  61. GRB 070611: ROTSE-III Optical Limits
  62. GRB 070610: Swift-UVOT Upper Limits
  63. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  64. GRB 070412: TAROT Calern observatory optical observations
  65. GRB 070411: TAROT Calern observatory optical observations
  66. GRB 070419A, deep LBT photometry and possible supernova detection
  67. GRB 070531: NOT nIR observations
  68. GRB 070531: I-band observations from IAC80
  69. GRB 070531: Liverpool Telescope Optical Observations
  70. GRB 070529: SARA upper limit
  71. Swift/UVOT refined analysis of GRB070529
  72. GRB 070529: Optical aterglow from MIRO
  73. GRB 070529, Swift-BAT refined analysis
  74. GRB 070529: Xinglong TNT Optical Upper Limit
  75. GRB 070529: Swift detection of a burst with an optical aterglow
  76. GRB 070412: Deep Keck imaging
  77. Swift trigger 280447 is probably a Galactic transient
  78. GRB070521: Second Epoch Gemini Imaging
  79. GRB 070521: Swift/UVOT Upper Limits
  80. GRB 070521, optical observation
  81. GRB 070521: Swift-XRT refined analysis
  82. GRB 070521: Keck imaging
  83. GRB070521: Gemini Observations
  84. GROND upper limits of GRB 070521
  85. GRB 070520B: SARA upper limit
  86. GRB 070520A: SARA upper limit
  87. GRB 070521: SARA upper limit
  88. GRB 070521: Subaru observations and possible host detection
  89. GRB 070520B: Swift/UVOT Upper Limits
  90. GRB 070520A: Subaru Observations
  91. GRB 070520A: Swift UVOT Upper Limits
  92. GRB 070521: TAROT La Silla observatory optical observations
  93. GRB070521 - SDSS Pre-Burst Observations
  94. GRB 070521: Swift detection of a burst
  95. GRB 070520A: MITSuME Akeno optical upper limits
  96. GRB 070520B, Swift-BAT refined analysis
  97. GRB 070520A: Swift-XRT refined analysis
  98. GRB 070518: TNG observations
  99. GRB 070520B: Swift detection of a burst
  100. GRB 070520: Xinglong EST optical Upper Limit

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