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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"

32532 results found.

  1. GRB 090709A : Quick look analysis of the Suzaku observation
  2. GRB 090728: Swift-BAT refined analysis
  3. GRB 090727: GRT Optical Observation
  4. GRB 090728: Swift XRT refined analysis
  5. GRB 090727: optical observations
  6. GRB 090726: GRT Optical Observation
  7. GRB 090727: Swift/UVOT Upper Limits
  8. GRB 090728: Swift/UVOT Upper Limits
  9. GRB 090727: I-band observations from 1.23m CAHA
  10. GRB 090728, RIMOTS optical upper limits
  11. GRB 090728A: Faulkes Telescope North Optical Afterglow Candidate
  12. GRB 090727: Swift-BAT refined analysis
  13. GRB 090727: Swift-XRT refined analysis
  14. GRB 090727: Liverpool Telescope Afterglow Confirmation and Optical Flare
  15. GRB 090715B: Late-time Lick 3m observations
  16. GRB 090727: Liverpool Telescope possible OT candidate
  17. GRB090726: Swift/UVOT observations
  18. GRB 090726, Swift-BAT refined analysis
  19. GRB 090726: Afterglow candidate photometryfrom Crni Vrh
  20. GRB 090726: D50 optical observations
  21. GRB090726: 6-meter telescope redshift
  22. GRB 090726: Swift-XRT Team refined analysis
  23. GRB 090726: optical transient candidate
  24. GRB 090726: Swift/UVOT Finding Chart Observation
  25. Konus-Wind and Konus-RF observations of GRB 090719
  26. Konus-RF and Konus-Wind observations of GRB 090718B
  27. Konus-Wind observations of bright hard GRB 090720B
  28. IPN Triangulation of bright GRB 090720B
  29. GRB 090720: Gemini-North Imaging and Optical Afterglow
  30. Swift XRT and UVOT refned analysis of GRB 090720
  31. GRB 090709A: Swift XRT Timing Analysis
  32. GRB 090715B: VLA radio detection
  33. GRB 090720 Source found in ground processing of Swift-BAT data
  34. GRB 090715B: further NOT optical observations
  35. GRB 090715A: Suzaku WAM observation of the prompt emission
  36. GRB 090709A - CARMA mm Observations
  37. GRB 090715B: Lick observations
  38. Konus-Wind observations of short/hard GRB 090715A
  39. GRB 090715B: MASTER optical limit
  40. GRB 090715A: Swift-BAT refined analysis
  41. Konus-Wind and Konus-RF observations of GRB 090715B
  42. GRB 090715B: Swift/UVOT followup observations
  43. GRB 090715B: break in the optical afterglow decay
  44. GRB 090715B: Observation of the optical afterglow
  45. GRB 090715B: Swift XRT Refined Analysis
  46. GRB090715B: WHT redshift
  47. GRB 090715B: Swift-BAT refined analysis
  48. GRB 090715B: NOT optical observations
  49. GRB 090715B - Liverpool Telescope Optical Afterglow Candidate
  50. GRB 090715A: ROTSE-III Optical Limits
  51. GRB 090715: Swift detection of a short hard burst
  52. Detection of GRB 090618 by RT-2 Experiment onboard the CORONAS-PHOTON Satellite
  53. Swift satellite anomaly
  54. GRB 090712: Fermi GBM observation
  55. GRB 090712: Swift-BAT refined analysis
  56. GRB 090709A: Xinglong TNT optical upper limit
  57. VLA radio observations of GRB 090709A
  58. GRB 090621B: MTM-500 optical observations
  59. GRB 090709A: deep optical observation with the 10.4m GTC
  60. GRB090709A : WSRT Radio observation
  61. GRB 090709A: Suzaku WAM observation of the prompt emission
  62. GRB 090709A: Swift UVOT upper limits
  63. GRB 090709A: WHT LIRIS observations
  64. GRB 090709B: Fermi GBM detection
  65. GRB 090709A: confirmation of the periodicity in the SPI-ACS data
  66. GRB 090709A: evidence for a very red afterglow at low z
  67. Konus-Wind and Konus-RF observations of GRB 090709A
  68. GRB 090709A: P60 Observations
  69. GRB 090709A: Quasiperiodic variations in the BAT light curve
  70. GRB 090709A: NOT optical observations
  71. GRB 090709A: RAPTOR Limits During Gamma-Ray Emission
  72. GRB 090709A: Swift XRT Refined Analysis
  73. GRB 090709B, Swift-BAT refined analysis
  74. GRB 090709A: Swift-BAT refined analysis
  75. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  76. GRB 090709A, RIMOTS optical upper limits
  77. GRB 090709A - PAIRITEL Discovery of a Red Afterglow
  78. GRB 090709A: Subaru NIR observation
  79. GRB 090709 : planned Suzaku-ToO observation
  80. GRB 090708 : Fermi GBM detection
  81. GRB 090709: Faulkes Telescope North Upper Limits
  82. GRB 090626: Suzaku WAM observation of the prompt emission
  83. GRB 090709: PAIRITEL NIR Upper Limits
  84. GRB 090704: Fermi GBM observation
  85. GRB 090709: ROTSE-III Optical Limits
  86. GRB 090708: Early RAPTOR Optical Limits
  87. GRB 090708, Swift-BAT refined analysis
  88. GRB 090708: ROTSE-III Optical Limits
  89. Possible GRB090705: Swift-XRT observations
  90. GRB 090705: PAIRITEL NIR Observations
  91. XRF 090702 : RTT150 optical observations
  92. GRB 090618: Mondy optical observations
  93. GRB 090529: CrAO optical upper limit
  94. GRB 090529: MTM-500 optical observations
  95. GRB 090529: Mt.Terskol optical observations
  96. XRF 090702: Swift-XRT refined analysis
  97. GRB 090702: UVOT upper limits
  98. GRB 090313: optical observations
  99. XRF 090702: VLT imaging
  100. XRF 090702: Swift-XRT afterglow position

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