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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"

23585 results found.

  1. GRB 090817: a long GRB localized by INTEGRAL
  2. GRB 090814B: I-band observations from 1.23m CAHA telescope
  3. GRB 090814B: Liverpool Telescope Observations
  4. GRB 090814A: Swift-BAT refined analysis
  5. GRB 090814B: a long GRB localized by INTEGRAL
  6. GRB 090814: GROND Detection of an Optical Afterglow Candidate
  7. GRB 090814: Swift detection of a burst
  8. GRB 090813, Swift-BAT refined analysis
  9. Konus-Wind observations of GRB090813
  10. GRB 090813: Liverpool Telescope afterglow confirmation
  11. GRB 090813: optical candidate from 1.23m CAHA telescope
  12. GRB 090813: Swift detection of a burst
  13. GRB 090812: Faulkes Telescope South Continued Optical Monitoring
  14. GRB 090812: Swift XRT refined analysis
  15. GRB 090812, RIMOTS optical upper limits
  16. GRB 090812 Swift-BAT Refined Analysis
  17. GRB090812: Swift/UVOT observations
  18. GRB 090812: GROND Observations of the Optical/NIR Afterglow
  19. GRB 090812: Liverpool Telescope afterglow confirmation
  20. GRB 090812: P60 Confirmation of Optical Afterglow
  21. GRB 090812: Swift detection of a burst with an optical counterpart
  22. GRB 090621B: MAGIC telescope GeV observation
  23. GRB 090621A: MAGIC telescope GeV observation
  24. GRB 090809: Swift-BAT refined analysis
  25. GRB 090809: Swift detection of a burst with a possible optical counterpart
  26. GRB 090807: Liverpool Telescope observations
  27. GRB 090807: MITSuME optical upper limit
  28. GRB 090807, Swift-BAT refined analysis
  29. GRB 090807: Swift detection of a burst
  30. IPN Triangulation and Konus-Wind observaions of GRB090727B
  31. Swift-BAT trigger 358760 is most likely not a GRB
  32. Swift trigger 358760 is probably a noise event
  33. GRB 090717A: Suzaku WAM observation of the prompt emission
  34. GRB 090709A : Quick look analysis of the Suzaku observation
  35. GRB 090728: Swift-BAT refined analysis
  36. GRB 090727: optical observations
  37. GRB 090727: I-band observations from 1.23m CAHA
  38. GRB 090728A: Faulkes Telescope North Optical Afterglow Candidate
  39. GRB 090728: Swift detection of a burst
  40. GRB 090727: Swift-BAT refined analysis
  41. GRB 090727: Liverpool Telescope possible OT candidate
  42. GRB 090727: Swift detection of a burst
  43. GRB 090726, Swift-BAT refined analysis
  44. GRB 090711: Fermi GBM detection
  45. GRB090726: 6-meter telescope redshift
  46. GRB 090726: optical transient candidate
  47. GRB 090726: Swift/UVOT Finding Chart Observation
  48. GRB 090726: Swift detection of a burst
  49. Swift Trigger 358354 is not a GRB
  50. Konus-Wind and Konus-RF observations of GRB 090719
  51. Konus-RF and Konus-Wind observations of GRB 090718B
  52. Konus-Wind observations of bright hard GRB 090720B
  53. IPN Triangulation of bright GRB 090720B
  54. GRB 090720B: Fermi GBM detection
  55. GRB 090720 Source found in ground processing of Swift-BAT data
  56. GRB 090717B: Fermi GBM detection
  57. GRB 090717: Fermi GBM detection
  58. GRB 090719: Fermi GBM detection
  59. GRB 090720: Fermi GBM detection
  60. GRB 090715A: Suzaku WAM observation of the prompt emission
  61. GRB 090715B: Lick observations
  62. Konus-Wind observations of short/hard GRB 090715A
  63. GRB 090715B: MASTER optical limit
  64. GRB 090715A: Swift-BAT refined analysis
  65. Konus-Wind and Konus-RF observations of GRB 090715B
  66. GRB 090715B: Observation of the optical afterglow
  67. GRB 090715B: Swift-BAT refined analysis
  68. GRB 090715B - Liverpool Telescope Optical Afterglow Candidate
  69. GRB 090715B: Swift detection of a burst with a possible optical counterpart
  70. GRB 090715: Swift detection of a short hard burst
  71. Detection of GRB 090618 by RT-2 Experiment onboard the CORONAS-PHOTON Satellite
  72. GRB 090713: Fermi GBM detection
  73. GRB 090712: Swift-BAT refined analysis
  74. GRB 090712: Swift detection of a burst
  75. GRB 090709A: deep optical observation with the 10.4m GTC
  76. GRB 090709A: Suzaku WAM observation of the prompt emission
  77. GRB 090709B: Fermi GBM detection
  78. GRB 090709A: confirmation of the periodicity in the SPI-ACS data
  79. GRB 090709A: evidence for a very red afterglow at low z
  80. Konus-Wind and Konus-RF observations of GRB 090709A
  81. GRB 090709A: Quasiperiodic variations in the BAT light curve
  82. GRB 090709B, Swift-BAT refined analysis
  83. GRB 090709A: Swift-BAT refined analysis
  84. GRB 090709A: Enhanced Swift-XRT position
  85. GRB 090709A: Subaru NIR observation
  86. GRB 090709B: Swift detection of a burst
  87. GRB 090626: Suzaku WAM observation of the prompt emission
  88. GRB 090704: Fermi GBM observation
  89. GRB 090709: Swift detection of a bright burst
  90. GRB 090708, Swift-BAT refined analysis
  91. GRB 090708: Swift detection of a burst
  92. GRB 090704: a long GRB found in INTEGRAL off-line analysis
  93. GRB 090706: Fermi GBM detection
  94. Swift-BAT trigger 356516 is not a GRB
  95. Possible GRB090705: Swift-XRT observations
  96. GRB 090705: Swift detection of a possible burst
  97. XRF 090702 : RTT150 optical observations
  98. GRB 090529: Mt.Terskol optical observations
  99. XRF 090702: Swift-XRT refined analysis
  100. GRB 090702: UVOT upper limits

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