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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"

38179 results found.

  1. IBAS Alert n. 4638: Not a GRB
  2. OT20050728 was not an optical GRB afterglow
  3. GRB 070616 : WIDGET simultaneous optical observations
  4. GRB 070616: Suzaku/WAM observation of the prompt emission
  5. IBAS Alert n.4637: not a GRB
  6. GRB 070612A: Second Epoch WSRT Radio Observations
  7. GRB070621: RTT150 optical observations
  8. GRB 070621: VLT optical observations
  9. GRB 070621: Swift/UVOT Upper Limits
  10. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  11. GRB 070621: Swift-BAT refined analysis
  12. GRB 070621: Gemini South optical imaging
  13. GRB 070621: UVOT-enhanced XRT position
  14. Observations of GRB070612A at Calar Alto
  15. GRB 070621: NOT observations
  16. GRB070621: OPTIMA-Burst optical upper limit
  17. GRB 070621: TAROT Calern observatory optical observations
  18. GRB 070621: Watcher Observations
  19. GRB 070621: ROTSE-III Prompt Optical Limits
  20. GRB 070621: Swift detection of a burst
  21. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  22. GRB 070612A: TNG optical observations
  23. Swift/UVOT detection of GRB070616 optical afterglow.
  24. GRB070612A: Gemini Spectroscopic Redshift
  25. GRB 070612A: NOT observations
  26. GRB 070612B: Optical Observation by MITSuME Akeno
  27. GRB070616: Optical Observation by MITSuME Okayama
  28. GRB 070616, Swift-BAT further refined analysis
  29. GRB 070616: Swift XRT refined circular
  30. GRB 070612A: Possible WSRT Radio Detection
  31. GRB 070616: BTA astrometry and finding chart
  32. GRB 070616: BTA optical observations
  33. GRB 070616: TLS observation
  34. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  35. GRB 070616, Swift-BAT partial refined analysis
  36. GRB 070616: Swift detection of a burst
  37. GRB 070612B: optical observations
  38. VLA upper limit on GRB 070610
  39. GRB 070615
  40. GRB 070615: A long GRB detected by INTEGRAL
  41. SWIFT J195509.6+261406 (GRB 070610): further observations
  42. GRB 070612A: Super-LOTIS observations
  43. GRB 070612A: Rapid Decay
  44. GRB 070612A: Suzaku/WAM observation of the prompt emission
  45. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  46. GRB070612A: MITSuME Okayama Observation
  47. GRB 070612A: continued SARA observations
  48. GRB 070612A: spectral lag
  49. GRB 070611: Watcher Observations
  50. Swift Trigger 282176 is Cygnus X-1
  51. GRB 070612A: MDM Observations
  52. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  53. GRB 070612B: SARA upper limit
  54. GRB 070612B, Swift-BAT refined analysis
  55. GRB 070612A, Swift-BAT refined analysis
  56. GRB 070612B: Swift-XRT refined analysis
  57. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  58. GRB 070612B: Swift/UVOT upper limits
  59. GRB 070612B: FRAM limit
  60. GRB070612B: P60 Observations
  61. GRB 070612B: KAIT limits
  62. GRB 070612A: SARA detection of possible OT
  63. GRB 070612B: Swift XRT position from downlink data
  64. GRB 070610: TAROT Calern observatory optical observations
  65. GRB 070610: MITSuME OAO optical upper limit
  66. GRB 070612B: Swift detection of a burst
  67. GRB070612 - SDSS Pre-Burst Observations
  68. GRB 070612: Swift detection of a burst
  69. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  70. GRB 070610: SARA upper limit
  71. GRB 070610: Swift-XRT refined analysis
  72. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  73. GRB 070611: Swift/UVOT Observations
  74. GRB 070611: Swift-XRT refined analysis
  75. GRB 070611, Swift-BAT refined analysis
  76. GRB 070610: Optical observations from OSN
  77. GRB 070610: Watcher Observations
  78. GRB 070611: VLT redshift
  79. GRB 060121 : pseudo-z = 1.9 ('intermediate-duration' burst)
  80. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  81. GRB 070611; Swift-XRT position
  82. GRB 070611: ROTSE-III Optical Limits
  83. GRB 070611: Swift detection of a burst
  84. GRB 070610: Swift-UVOT Upper Limits
  85. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  86. GRB 070610, Swift-BAT refined analysis
  87. GRB 070610; Swift-XRT position
  88. GRB 070610: Swift detection of a burst
  89. GRB 070412: TAROT Calern observatory optical observations
  90. GRB 070411: TAROT Calern observatory optical observations
  91. GRB 070419A, deep LBT photometry and possible supernova detection
  92. GRB070520B: optical observations
  93. GRB070520: optical observation
  94. GRB070518: optical observation
  95. GRB070521: optical observation
  96. GRB 070531: NOT nIR observations
  97. GRB 070531: Swift-BAT refined analysis
  98. GRB 070531: I-band observations from IAC80
  99. GRB 070531: Swift-XRT position
  100. GRB 070531: Liverpool Telescope Optical Observations

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