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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"

43902 results found.

  1. GRB 070704: Swift detection of a burst
  2. GRB 070626: Suzaku/WAM observation of the prompt emission
  3. GRB 070626: IPN localization and Konus spectrum of a bright long burst
  4. GRB 070628 Swift-UVOT Refined Analysis
  5. GRB 070628: NIR detection of afterglow
  6. GRB 070628, Swift-BAT refined analysis
  7. GRB 070628: TAROT La Silla observatory optical observations
  8. GRB 070628: Swift XRT refined analysis
  9. GRB 070628: Watcher Observations
  10. Swift UVOT Observations of GRB 070628
  11. GRB 070628: Swift detection of a possible burst
  12. GRB 070612A: Allen Telescope Array Observations
  13. IBAS Alert n. 4638: Not a GRB
  14. OT20050728 was not an optical GRB afterglow
  15. INTEGRAL burst GRB070615: X-ray continued observations
  16. GRB 070616 : WIDGET simultaneous optical observations
  17. GRB 070616: Suzaku/WAM observation of the prompt emission
  18. IBAS Alert n.4637: not a GRB
  19. GRB 070612A: Second Epoch WSRT Radio Observations
  20. GRB070621: RTT150 optical observations
  21. GRB 070621: VLT optical observations
  22. GRB 070621: Swift/UVOT Upper Limits
  23. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  24. GRB 070621: Swift-BAT refined analysis
  25. WHT observations of GRB070621
  26. GRB070621: Swift XRT refined analysis
  27. GRB 070621: Gemini South optical imaging
  28. GRB 070621: UVOT-enhanced XRT position
  29. Observations of GRB070612A at Calar Alto
  30. GRB 070621: NOT observations
  31. GRB070621: OPTIMA-Burst optical upper limit
  32. GRB 070621: TAROT Calern observatory optical observations
  33. GRB 070621: Watcher Observations
  34. GRB 070621: ROTSE-III Prompt Optical Limits
  35. GRB 070621: Swift detection of a burst
  36. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  37. GRB 070612A: TNG optical observations
  38. Swift/UVOT detection of GRB070616 optical afterglow.
  39. GRB070612A: Gemini Spectroscopic Redshift
  40. GRB 070612A: NOT observations
  41. GRB070616: Optical Observation by MITSuME Akeno
  42. GRB070616: Optical Observation by MITSuME Okayama
  43. GRB 070616, Swift-BAT further refined analysis
  44. GRB 070616: Swift XRT refined circular
  45. GRB 070612A: Possible WSRT Radio Detection
  46. GRB 070616: BTA astrometry and finding chart
  47. GRB 070616: BTA optical observations
  48. Swift/UVOT observations of GRB070616
  49. GRB 070616: TLS observation
  50. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  51. GRB 070616, Swift-BAT partial refined analysis
  52. GRB 070616: Swift detection of a burst
  53. GRB 070612B: optical observations
  54. VLA upper limit on GRB 070610
  55. GRB 070615: A long GRB detected by INTEGRAL
  56. SWIFT J195509.6+261406 (GRB 070610): further observations
  57. GRB 070612A: Super-LOTIS observations
  58. GRB 070612A: Rapid Decay
  59. GRB 070612A: Suzaku/WAM observation of the prompt emission
  60. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  61. GRB070612A: MITSuME Okayama Observation
  62. GRB 070612A: continued SARA observations
  63. GRB 070612A: spectral lag
  64. GRB 070611: Watcher Observations
  65. Swift Trigger 282176 is Cygnus X-1
  66. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  67. GRB 070612B: SARA upper limit
  68. GRB 070612B, Swift-BAT refined analysis
  69. GRB 070612A, Swift-BAT refined analysis
  70. GRB 070612B: Swift-XRT refined analysis
  71. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  72. GRB 070612B: Swift/UVOT upper limits
  73. GRB070612B: P60 Observations
  74. GRB 070612B: KAIT limits
  75. GRB 070612A: SARA detection of possible OT
  76. GRB 070612B: Swift XRT position from downlink data
  77. GRB 070610: TAROT Calern observatory optical observations
  78. GRB 070610: MITSuME OAO optical upper limit
  79. GRB 070612B: Swift detection of a burst
  80. GRB070612 - SDSS Pre-Burst Observations
  81. GRB 070612: Swift detection of a burst
  82. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  83. GRB 070610: SARA upper limit
  84. GRB 070610: Swift-XRT refined analysis
  85. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  86. GRB 070611: Swift/UVOT Observations
  87. GRB 070611: Swift-XRT refined analysis
  88. GRB 070611, Swift-BAT refined analysis
  89. GRB 070610: Optical observations from OSN
  90. GRB 070610: Watcher Observations
  91. GRB 070611: VLT redshift
  92. GRB 060121 : pseudo-z = 1.9 ('intermediate-duration' burst)
  93. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  94. GRB 070611; Swift-XRT position
  95. GRB 070611: ROTSE-III Optical Limits
  96. GRB 070611: Swift detection of a burst
  97. GRB 070610: Swift-UVOT Upper Limits
  98. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  99. GRB 070610, Swift-BAT refined analysis
  100. GRB 070610; Swift-XRT position

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