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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"

36300 results found.

  1. GRB 070714B: Swift-BAT spectral lag for the SHB
  2. GRB 070714B: confirmation of optical afterglow
  3. GRB 070616: No Evidence for I Band Afterglow
  4. GRB 070714A: Swift XRT refined analysis
  5. GRB070714B: Swift-XRT refined analysis
  6. GRB 070707: Swift-XRT follow-up observations
  7. GRB 070714b ("Bastille"): Optical Pre-Imaging (Clarification)
  8. GRB 070714 ("Bastille"): Optical Pre-Imaging
  9. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  10. GRB 070714A, Swift-BAT refined analysis
  11. GRB 070714 : Liverpool Telescope optical counterpart ?
  12. GRB 070714: Swift detection of a bright burst, possibly short
  13. Swift detection of a possible burst (Trigger 284850)
  14. SN 2007bg - off-axis GRB?
  15. GRB 070704: RTT150 optical observations
  16. GRB 070704: Suzaku/WAM observation of the prompt emission
  17. Konus-Wind observation of GRB 070707
  18. GRB 070707: optical afterglow
  19. GRB 070707: object inside XRT error circle
  20. Swift XRT observation of GRB 070707
  21. GRB 070707: VLT observations
  22. INTEGRAL GRB 070707 is a short hard burst
  23. INTEGRAL GRB 070707 is a short hard burst
  24. GRB 070707: A long GRB detected by INTEGRAL
  25. GRB 070707: A long GRB detected by INTEGRAL
  26. GRB 070429B: NIR Observations
  27. GRB070704: FAVOR optical observations
  28. GRB 070704 : Liverpool Telescope Observations
  29. GRB 070611: VLT observations
  30. VLA detection of GRB 070612A in C Band
  31. Konus-Wind observation of GRB 070626
  32. GRB 070704: Swift-XRT refined analysis
  33. Swift/UVOT Observations of GRB070704
  34. GRB 070704, Swift-BAT refined analysis
  35. GRB 070704: Correction to GCN Circ 6594
  36. GRB 070704: Swift detection of a burst
  37. GRB 070626: Suzaku/WAM observation of the prompt emission
  38. GRB 070626: IPN localization and Konus spectrum of a bright long burst
  39. GRB 070628 Swift-UVOT Refined Analysis
  40. GRB 070628: NIR detection of afterglow
  41. GRB 070628, Swift-BAT refined analysis
  42. GRB 070628: TAROT La Silla observatory optical observations
  43. GRB 070628: Swift XRT refined analysis
  44. GRB 070628: Watcher Observations
  45. Swift UVOT Observations of GRB 070628
  46. GRB 070628: Swift detection of a possible burst
  47. GRB 070612A: Allen Telescope Array Observations
  48. IBAS Alert n. 4638: Not a GRB
  49. OT20050728 was not an optical GRB afterglow
  50. GRB 070616 : WIDGET simultaneous optical observations
  51. GRB 070616: Suzaku/WAM observation of the prompt emission
  52. IBAS Alert n.4637: not a GRB
  53. GRB 070612A: Second Epoch WSRT Radio Observations
  54. GRB070621: RTT150 optical observations
  55. GRB 070621: VLT optical observations
  56. GRB 070621: Swift/UVOT Upper Limits
  57. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  58. GRB 070621: Swift-BAT refined analysis
  59. GRB070621: Swift XRT refined analysis
  60. GRB 070621: Gemini South optical imaging
  61. GRB 070621: UVOT-enhanced XRT position
  62. Observations of GRB070612A at Calar Alto
  63. GRB 070621: NOT observations
  64. GRB070621: OPTIMA-Burst optical upper limit
  65. GRB 070621: TAROT Calern observatory optical observations
  66. GRB 070621: Watcher Observations
  67. GRB 070621: ROTSE-III Prompt Optical Limits
  68. GRB 070621: Swift detection of a burst
  69. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  70. GRB 070612A: TNG optical observations
  71. Swift/UVOT detection of GRB070616 optical afterglow.
  72. GRB070612A: Gemini Spectroscopic Redshift
  73. GRB 070612A: NOT observations
  74. GRB 070612B: Optical Observation by MITSuME Akeno
  75. GRB070616: Optical Observation by MITSuME Okayama
  76. GRB 070616, Swift-BAT further refined analysis
  77. GRB 070616: Swift XRT refined circular
  78. GRB 070612A: Possible WSRT Radio Detection
  79. GRB 070616: BTA astrometry and finding chart
  80. GRB 070616: BTA optical observations
  81. GRB 070616: TLS observation
  82. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  83. GRB 070616, Swift-BAT partial refined analysis
  84. GRB 070616: Swift detection of a burst
  85. GRB 070612B: optical observations
  86. VLA upper limit on GRB 070610
  87. GRB 070615
  88. GRB 070615: A long GRB detected by INTEGRAL
  89. SWIFT J195509.6+261406 (GRB 070610): further observations
  90. GRB 070612A: Super-LOTIS observations
  91. GRB 070612A: Rapid Decay
  92. GRB 070612A: Suzaku/WAM observation of the prompt emission
  93. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  94. GRB070612A: MITSuME Okayama Observation
  95. GRB 070612A: continued SARA observations
  96. GRB 070612A: spectral lag
  97. GRB 070611: Watcher Observations
  98. Swift Trigger 282176 is Cygnus X-1
  99. GRB 070612A: MDM Observations
  100. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby

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