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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

43921 results found.

  1. Updated Swift/UVOT calibration
  2. GRB 070707: optical afterglow
  3. GRB 070707: object inside XRT error circle
  4. Swift/UVOT Observations of GRB070707
  5. Swift XRT observation of GRB 070707
  6. INTEGRAL GRB 070707 is a short hard burst
  7. INTEGRAL GRB 070707 is a short hard burst
  8. GRB 070707: A long GRB detected by INTEGRAL
  9. GRB 070707: A long GRB detected by INTEGRAL
  10. GRB 070429B: NIR Observations
  11. GRB070704: FAVOR optical observations
  12. GRB 070704 : Liverpool Telescope Observations
  13. GRB 070611: VLT observations
  14. VLA detection of GRB 070612A in C Band
  15. Konus-Wind observation of GRB 070626
  16. GRB 070704: Swift-XRT refined analysis
  17. Swift/UVOT Observations of GRB070704
  18. GRB 070704, Swift-BAT refined analysis
  19. GRB 070704: Correction to GCN Circ 6594
  20. GRB 070704: Swift detection of a burst
  21. GRB 070626: Suzaku/WAM observation of the prompt emission
  22. GRB 070626: IPN localization and Konus spectrum of a bright long burst
  23. GRB 070628 Swift-UVOT Refined Analysis
  24. GRB 070628: NIR detection of afterglow
  25. GRB 070628, Swift-BAT refined analysis
  26. GRB 070628: TAROT La Silla observatory optical observations
  27. GRB 070628: Swift XRT refined analysis
  28. GRB 070628: Watcher Observations
  29. Swift UVOT Observations of GRB 070628
  30. GRB 070628: Swift detection of a possible burst
  31. GRB 070612A: Allen Telescope Array Observations
  32. IBAS Alert n. 4638: Not a GRB
  33. OT20050728 was not an optical GRB afterglow
  34. INTEGRAL burst GRB070615: X-ray continued observations
  35. GRB 070616 : WIDGET simultaneous optical observations
  36. GRB 070616: Suzaku/WAM observation of the prompt emission
  37. IBAS Alert n.4637: not a GRB
  38. GRB 070612A: Second Epoch WSRT Radio Observations
  39. GRB070621: RTT150 optical observations
  40. GRB 070621: VLT optical observations
  41. GRB 070621: Swift/UVOT Upper Limits
  42. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  43. GRB 070621: Swift-BAT refined analysis
  44. WHT observations of GRB070621
  45. GRB070621: Swift XRT refined analysis
  46. GRB 070621: Gemini South optical imaging
  47. GRB 070621: UVOT-enhanced XRT position
  48. Observations of GRB070612A at Calar Alto
  49. GRB 070621: NOT observations
  50. GRB070621: OPTIMA-Burst optical upper limit
  51. GRB 070621: TAROT Calern observatory optical observations
  52. GRB 070621: Watcher Observations
  53. GRB 070621: ROTSE-III Prompt Optical Limits
  54. GRB 070621: Swift detection of a burst
  55. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  56. GRB 070612A: TNG optical observations
  57. Swift/UVOT detection of GRB070616 optical afterglow.
  58. GRB070612A: Gemini Spectroscopic Redshift
  59. GRB 070612A: NOT observations
  60. GRB070616: Optical Observation by MITSuME Akeno
  61. GRB070616: Optical Observation by MITSuME Okayama
  62. GRB 070616, Swift-BAT further refined analysis
  63. GRB 070616: Swift XRT refined circular
  64. GRB 070612A: Possible WSRT Radio Detection
  65. GRB 070616: BTA astrometry and finding chart
  66. GRB 070616: BTA optical observations
  67. Swift/UVOT observations of GRB070616
  68. GRB 070616: TLS observation
  69. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  70. GRB 070616, Swift-BAT partial refined analysis
  71. GRB 070616: Swift detection of a burst
  72. GRB 070612B: optical observations
  73. VLA upper limit on GRB 070610
  74. GRB 070615: A long GRB detected by INTEGRAL
  75. SWIFT J195509.6+261406 (GRB 070610): further observations
  76. GRB 070612A: Super-LOTIS observations
  77. GRB 070612A: Rapid Decay
  78. GRB 070612A: Suzaku/WAM observation of the prompt emission
  79. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  80. GRB070612A: MITSuME Okayama Observation
  81. GRB 070612A: continued SARA observations
  82. GRB 070612A: spectral lag
  83. GRB 070611: Watcher Observations
  84. Swift Trigger 282176 is Cygnus X-1
  85. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  86. GRB 070612B: SARA upper limit
  87. GRB 070612B, Swift-BAT refined analysis
  88. GRB 070612A, Swift-BAT refined analysis
  89. GRB 070612B: Swift-XRT refined analysis
  90. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  91. GRB 070612B: Swift/UVOT upper limits
  92. GRB070612B: P60 Observations
  93. GRB 070612B: KAIT limits
  94. GRB 070612A: SARA detection of possible OT
  95. GRB 070612B: Swift XRT position from downlink data
  96. GRB 070610: TAROT Calern observatory optical observations
  97. GRB 070610: MITSuME OAO optical upper limit
  98. GRB 070612B: Swift detection of a burst
  99. GRB070612 - SDSS Pre-Burst Observations
  100. GRB 070612: Swift detection of a burst

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