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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"

37512 results found.

  1. GRB 070714A: Swift XRT refined analysis
  2. GRB070714B: Swift-XRT refined analysis
  3. GRB 070707: Swift-XRT follow-up observations
  4. GRB 070714b ("Bastille"): Optical Pre-Imaging (Clarification)
  5. GRB 070714 ("Bastille"): Optical Pre-Imaging
  6. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  7. GRB 070714A, Swift-BAT refined analysis
  8. GRB 070714 : Liverpool Telescope optical counterpart ?
  9. GRB 070714: Swift detection of a bright burst, possibly short
  10. Swift detection of a possible burst (Trigger 284850)
  11. SN 2007bg - off-axis GRB?
  12. GRB 070704: RTT150 optical observations
  13. GRB 070704: Suzaku/WAM observation of the prompt emission
  14. Konus-Wind observation of GRB 070707
  15. GRB 070707: optical afterglow
  16. GRB 070707: object inside XRT error circle
  17. Swift XRT observation of GRB 070707
  18. GRB 070707: VLT observations
  19. INTEGRAL GRB 070707 is a short hard burst
  20. INTEGRAL GRB 070707 is a short hard burst
  21. GRB 070707: A long GRB detected by INTEGRAL
  22. GRB 070707: A long GRB detected by INTEGRAL
  23. GRB 070429B: NIR Observations
  24. GRB070704: FAVOR optical observations
  25. GRB 070704 : Liverpool Telescope Observations
  26. GRB 070611: VLT observations
  27. VLA detection of GRB 070612A in C Band
  28. Konus-Wind observation of GRB 070626
  29. GRB 070704: Swift-XRT refined analysis
  30. Swift/UVOT Observations of GRB070704
  31. GRB 070704, Swift-BAT refined analysis
  32. GRB 070704: Correction to GCN Circ 6594
  33. GRB 070704: Swift detection of a burst
  34. GRB 070626: Suzaku/WAM observation of the prompt emission
  35. GRB 070626: IPN localization and Konus spectrum of a bright long burst
  36. GRB 070628 Swift-UVOT Refined Analysis
  37. GRB 070628: NIR detection of afterglow
  38. GRB 070628, Swift-BAT refined analysis
  39. GRB 070628: TAROT La Silla observatory optical observations
  40. GRB 070628: Swift XRT refined analysis
  41. GRB 070628: Watcher Observations
  42. Swift UVOT Observations of GRB 070628
  43. GRB 070628: Swift detection of a possible burst
  44. GRB 070612A: Allen Telescope Array Observations
  45. IBAS Alert n. 4638: Not a GRB
  46. OT20050728 was not an optical GRB afterglow
  47. GRB 070616 : WIDGET simultaneous optical observations
  48. GRB 070616: Suzaku/WAM observation of the prompt emission
  49. IBAS Alert n.4637: not a GRB
  50. GRB 070612A: Second Epoch WSRT Radio Observations
  51. GRB070621: RTT150 optical observations
  52. GRB 070621: VLT optical observations
  53. GRB 070621: Swift/UVOT Upper Limits
  54. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  55. GRB 070621: Swift-BAT refined analysis
  56. GRB 070621: Gemini South optical imaging
  57. GRB 070621: UVOT-enhanced XRT position
  58. Observations of GRB070612A at Calar Alto
  59. GRB 070621: NOT observations
  60. GRB070621: OPTIMA-Burst optical upper limit
  61. GRB 070621: TAROT Calern observatory optical observations
  62. GRB 070621: Watcher Observations
  63. GRB 070621: ROTSE-III Prompt Optical Limits
  64. GRB 070621: Swift detection of a burst
  65. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  66. GRB 070612A: TNG optical observations
  67. Swift/UVOT detection of GRB070616 optical afterglow.
  68. GRB070612A: Gemini Spectroscopic Redshift
  69. GRB 070612A: NOT observations
  70. GRB 070612B: Optical Observation by MITSuME Akeno
  71. GRB070616: Optical Observation by MITSuME Okayama
  72. GRB 070616, Swift-BAT further refined analysis
  73. GRB 070616: Swift XRT refined circular
  74. GRB 070612A: Possible WSRT Radio Detection
  75. GRB 070616: BTA astrometry and finding chart
  76. GRB 070616: BTA optical observations
  77. GRB 070616: TLS observation
  78. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  79. GRB 070616, Swift-BAT partial refined analysis
  80. GRB 070616: Swift detection of a burst
  81. GRB 070612B: optical observations
  82. VLA upper limit on GRB 070610
  83. GRB 070615
  84. GRB 070615: A long GRB detected by INTEGRAL
  85. SWIFT J195509.6+261406 (GRB 070610): further observations
  86. GRB 070612A: Super-LOTIS observations
  87. GRB 070612A: Rapid Decay
  88. GRB 070612A: Suzaku/WAM observation of the prompt emission
  89. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  90. GRB070612A: MITSuME Okayama Observation
  91. GRB 070612A: continued SARA observations
  92. GRB 070612A: spectral lag
  93. GRB 070611: Watcher Observations
  94. Swift Trigger 282176 is Cygnus X-1
  95. GRB 070612A: MDM Observations
  96. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  97. GRB 070612B: SARA upper limit
  98. GRB 070612B, Swift-BAT refined analysis
  99. GRB 070612A, Swift-BAT refined analysis
  100. GRB 070612B: Swift-XRT refined analysis

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