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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"

45637 results found.

  1. GRB 070616: BTA astrometry and finding chart
  2. GRB 070616: BTA optical observations
  3. Swift/UVOT observations of GRB070616
  4. GRB 070616: TLS observation
  5. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  6. GRB 070616, Swift-BAT partial refined analysis
  7. GRB 070616: Swift detection of a burst
  8. GRB 070612B: optical observations
  9. UVOT Observations of INTEGRAL burst GRB070615
  10. VLA upper limit on GRB 070610
  11. GRB 070615
  12. GRB 070615: A long GRB detected by INTEGRAL
  13. SWIFT J195509.6+261406 (GRB 070610): further observations
  14. GRB 070612A: Super-LOTIS observations
  15. GRB 070612A: Rapid Decay
  16. GRB 070612A: Suzaku/WAM observation of the prompt emission
  17. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  18. GRB070612A: MITSuME Okayama Observation
  19. GRB 070612A: continued SARA observations
  20. GRB 070612A: spectral lag
  21. GRB 070611: Watcher Observations
  22. Swift Trigger 282176 is Cygnus X-1
  23. GRB 070612A: MDM Observations
  24. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  25. GRB 070612B: SARA upper limit
  26. GRB 070612B, Swift-BAT refined analysis
  27. GRB 070612A, Swift-BAT refined analysis
  28. GRB 070612B: Swift-XRT refined analysis
  29. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  30. GRB 070612B: Swift/UVOT upper limits
  31. GRB 070612B: FRAM limit
  32. GRB070612B: P60 Observations
  33. GRB 070612B: KAIT limits
  34. GRB 070612A: SARA detection of possible OT
  35. GRB 070612B: Swift XRT position from downlink data
  36. GRB 070610: TAROT Calern observatory optical observations
  37. GRB 070610: MITSuME OAO optical upper limit
  38. GRB 070612B: Swift detection of a burst
  39. GRB070612 - SDSS Pre-Burst Observations
  40. GRB 070612: Swift detection of a burst
  41. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  42. GRB 070610: SARA upper limit
  43. GRB 070610: Swift-XRT refined analysis
  44. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  45. GRB 070611: Swift/UVOT Observations
  46. GRB 070611: Swift-XRT refined analysis
  47. GRB 070611, Swift-BAT refined analysis
  48. GRB 070610: Optical observations from OSN
  49. GRB 070610: Watcher Observations
  50. GRB 070611: VLT redshift
  51. GRB 060121 : pseudo-z = 1.9 ('intermediate-duration' burst)
  52. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  53. GRB 070611; Swift-XRT position
  54. GRB 070611: ROTSE-III Optical Limits
  55. GRB 070611: Swift detection of a burst
  56. GRB 070610: Swift-UVOT Upper Limits
  57. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  58. GRB 070610, Swift-BAT refined analysis
  59. GRB 070610; Swift-XRT position
  60. GRB 070610: Swift detection of a burst
  61. GRB 070412: TAROT Calern observatory optical observations
  62. GRB 070411: TAROT Calern observatory optical observations
  63. GRB 070419A, deep LBT photometry and possible supernova detection
  64. GRB070520B: optical observations
  65. GRB070520: optical observation
  66. GRB070518: optical observation
  67. GRB070521: optical observation
  68. Swift/UVOT refined analysis of GRB070531
  69. GRB 070531: NOT nIR observations
  70. GRB 070531: Swift-BAT refined analysis
  71. GRB 070531: I-band observations from IAC80
  72. GRB 070531: Swift-XRT position
  73. GRB 070531: Liverpool Telescope Optical Observations
  74. GRB 070531: Swift detection of a burst
  75. GRB 070529: SARA upper limit
  76. Swift/UVOT refined analysis of GRB070529
  77. GRB 070529: MARGE Observations
  78. GRB 070529: Optical aterglow from MIRO
  79. GRB 070529: Gemini Redshift
  80. GRB 070529: Swift-XRT refined analysis
  81. GRB 070529, Swift-BAT refined analysis
  82. GRB 070529: Xinglong TNT Optical Upper Limit
  83. GRB 070529: Swift detection of a burst with an optical aterglow
  84. GRB 070412: Deep Keck imaging
  85. Swift Triggers 280447, 280450 and 280451 are invalid
  86. Swift trigger 280447 is probably a Galactic transient
  87. GRB 070518, deep LBT photometry
  88. GRB 070518: MARGE Observations
  89. GRB 070521: pseudo-z ~ 2.28 from prompt emission spectrum
  90. Konus-Wind observation of GRB 070521
  91. GRB 070518: optical observation
  92. GRB070521: Second Epoch Gemini Imaging
  93. GRB070521: NIR observations
  94. GRB070520B: NIR observations
  95. GRB 070521: Swift/UVOT Upper Limits
  96. GRB 070521, optical observation
  97. GRB 070521: Swift-XRT refined analysis
  98. GRB 070521: Keck imaging
  99. GRB070521: Gemini Observations
  100. GROND upper limits of GRB 070521

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