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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"

44623 results found.

  1. Erratum : Suzaku WAM observation of GRB 070704
  2. GRB 070714A: Swift/UVOT Upper limits
  3. GRB 070714B: Swift/UVOT Upper Limits
  4. GRB 070714B: Swift-BAT spectral lag for the SHB
  5. GRB 070714B: confirmation of optical afterglow
  6. GRB 070616: No Evidence for I Band Afterglow
  7. GRB 070714A: Swift XRT refined analysis
  8. GRB070714B: Swift-XRT refined analysis
  9. GRB 070707: Swift-XRT follow-up observations
  10. GRB 070714b ("Bastille"): Optical Pre-Imaging (Clarification)
  11. GRB 070714 ("Bastille"): Optical Pre-Imaging
  12. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  13. GRB 070714A, Swift-BAT refined analysis
  14. GRB 070714 : Liverpool Telescope optical counterpart ?
  15. GRB 070714: Swift detection of a bright burst, possibly short
  16. Swift detection of a possible burst (Trigger 284850)
  17. SN 2007bg - off-axis GRB?
  18. GRB 070704: RTT150 optical observations
  19. GRB 070704: Suzaku/WAM observation of the prompt emission
  20. Konus-Wind observation of GRB 070707
  21. Updated Swift/UVOT calibration
  22. GRB 070707: optical afterglow
  23. GRB 070707: object inside XRT error circle
  24. Swift/UVOT Observations of GRB070707
  25. Swift XRT observation of GRB 070707
  26. GRB 070707: VLT observations
  27. INTEGRAL GRB 070707 is a short hard burst
  28. INTEGRAL GRB 070707 is a short hard burst
  29. GRB 070707: A long GRB detected by INTEGRAL
  30. GRB 070707: A long GRB detected by INTEGRAL
  31. GRB 070429B: NIR Observations
  32. GRB070704: FAVOR optical observations
  33. GRB 070704 : Liverpool Telescope Observations
  34. GRB 070611: VLT observations
  35. VLA detection of GRB 070612A in C Band
  36. Konus-Wind observation of GRB 070626
  37. GRB 070704: Swift-XRT refined analysis
  38. Swift/UVOT Observations of GRB070704
  39. GRB 070704, Swift-BAT refined analysis
  40. GRB 070704: Correction to GCN Circ 6594
  41. GRB 070704: Swift detection of a burst
  42. GRB 070626: Suzaku/WAM observation of the prompt emission
  43. GRB 070626: IPN localization and Konus spectrum of a bright long burst
  44. GRB 070628 Swift-UVOT Refined Analysis
  45. GRB 070628: NIR detection of afterglow
  46. GRB 070628, Swift-BAT refined analysis
  47. GRB 070628: TAROT La Silla observatory optical observations
  48. GRB 070628: Swift XRT refined analysis
  49. GRB 070628: Watcher Observations
  50. Swift UVOT Observations of GRB 070628
  51. GRB 070628: Swift detection of a possible burst
  52. GRB 070612A: Allen Telescope Array Observations
  53. IBAS Alert n. 4638: Not a GRB
  54. OT20050728 was not an optical GRB afterglow
  55. INTEGRAL burst GRB070615: X-ray continued observations
  56. GRB 070616 : WIDGET simultaneous optical observations
  57. GRB 070616: Suzaku/WAM observation of the prompt emission
  58. IBAS Alert n.4637: not a GRB
  59. GRB 070612A: Second Epoch WSRT Radio Observations
  60. GRB070621: RTT150 optical observations
  61. GRB 070621: VLT optical observations
  62. GRB 070621: Swift/UVOT Upper Limits
  63. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  64. GRB 070621: Swift-BAT refined analysis
  65. WHT observations of GRB070621
  66. GRB070621: Swift XRT refined analysis
  67. GRB 070621: Gemini South optical imaging
  68. GRB 070621: UVOT-enhanced XRT position
  69. Observations of GRB070612A at Calar Alto
  70. GRB 070621: NOT observations
  71. GRB070621: OPTIMA-Burst optical upper limit
  72. GRB 070621: TAROT Calern observatory optical observations
  73. GRB 070621: Watcher Observations
  74. GRB 070621: ROTSE-III Prompt Optical Limits
  75. GRB 070621: Swift detection of a burst
  76. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  77. GRB 070612A: TNG optical observations
  78. Swift/UVOT detection of GRB070616 optical afterglow.
  79. GRB070612A: Gemini Spectroscopic Redshift
  80. GRB 070612A: NOT observations
  81. GRB070616: Optical Observation by MITSuME Akeno
  82. GRB 070612B: Optical Observation by MITSuME Akeno
  83. GRB070616: Optical Observation by MITSuME Okayama
  84. GRB 070616, Swift-BAT further refined analysis
  85. GRB 070616: Swift XRT refined circular
  86. GRB 070612A: Possible WSRT Radio Detection
  87. GRB 070616: BTA astrometry and finding chart
  88. GRB 070616: BTA optical observations
  89. Swift/UVOT observations of GRB070616
  90. GRB 070616: TLS observation
  91. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  92. GRB 070616, Swift-BAT partial refined analysis
  93. GRB 070616: Swift detection of a burst
  94. GRB 070612B: optical observations
  95. UVOT Observations of INTEGRAL burst GRB070615
  96. VLA upper limit on GRB 070610
  97. GRB 070615
  98. GRB 070615: A long GRB detected by INTEGRAL
  99. SWIFT J195509.6+261406 (GRB 070610): further observations
  100. GRB 070612A: Super-LOTIS observations

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