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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"

32509 results found.

  1. GRB 090726: Swift/UVOT Finding Chart Observation
  2. Konus-Wind and Konus-RF observations of GRB 090719
  3. Konus-RF and Konus-Wind observations of GRB 090718B
  4. Konus-Wind observations of bright hard GRB 090720B
  5. IPN Triangulation of bright GRB 090720B
  6. GRB 090720: Gemini-North Imaging and Optical Afterglow
  7. Swift XRT and UVOT refned analysis of GRB 090720
  8. GRB 090709A: Swift XRT Timing Analysis
  9. GRB 090715B: VLA radio detection
  10. GRB 090720 Source found in ground processing of Swift-BAT data
  11. GRB 090715B: further NOT optical observations
  12. GRB 090715A: Suzaku WAM observation of the prompt emission
  13. GRB 090709A - CARMA mm Observations
  14. GRB 090715B: Lick observations
  15. Konus-Wind observations of short/hard GRB 090715A
  16. GRB 090715B: MASTER optical limit
  17. GRB 090715A: Swift-BAT refined analysis
  18. Konus-Wind and Konus-RF observations of GRB 090715B
  19. GRB 090715B: Swift/UVOT followup observations
  20. GRB 090715B: break in the optical afterglow decay
  21. GRB 090715B: Observation of the optical afterglow
  22. GRB 090715B: Swift XRT Refined Analysis
  23. GRB090715B: WHT redshift
  24. GRB 090715B: Swift-BAT refined analysis
  25. GRB 090715B: NOT optical observations
  26. GRB 090715B - Liverpool Telescope Optical Afterglow Candidate
  27. GRB 090715A: ROTSE-III Optical Limits
  28. GRB 090715: Swift detection of a short hard burst
  29. Detection of GRB 090618 by RT-2 Experiment onboard the CORONAS-PHOTON Satellite
  30. Swift satellite anomaly
  31. GRB 090712: Fermi GBM observation
  32. GRB 090712: Swift-BAT refined analysis
  33. GRB 090709A: Xinglong TNT optical upper limit
  34. VLA radio observations of GRB 090709A
  35. GRB 090621B: MTM-500 optical observations
  36. GRB 090709A: deep optical observation with the 10.4m GTC
  37. GRB090709A : WSRT Radio observation
  38. GRB 090709A: Suzaku WAM observation of the prompt emission
  39. GRB 090709A: Swift UVOT upper limits
  40. GRB 090709A: WHT LIRIS observations
  41. GRB 090709B: Fermi GBM detection
  42. GRB 090709A: confirmation of the periodicity in the SPI-ACS data
  43. GRB 090709A: evidence for a very red afterglow at low z
  44. Konus-Wind and Konus-RF observations of GRB 090709A
  45. GRB 090709A: P60 Observations
  46. GRB 090709A: Quasiperiodic variations in the BAT light curve
  47. GRB 090709A: NOT optical observations
  48. GRB 090709A: RAPTOR Limits During Gamma-Ray Emission
  49. GRB 090709A: Swift XRT Refined Analysis
  50. GRB 090709B, Swift-BAT refined analysis
  51. GRB 090709A: Swift-BAT refined analysis
  52. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  53. GRB 090709A, RIMOTS optical upper limits
  54. GRB 090709A - PAIRITEL Discovery of a Red Afterglow
  55. GRB 090709A: Subaru NIR observation
  56. GRB 090709 : planned Suzaku-ToO observation
  57. GRB 090708 : Fermi GBM detection
  58. GRB 090709: Faulkes Telescope North Upper Limits
  59. GRB 090626: Suzaku WAM observation of the prompt emission
  60. GRB 090709: PAIRITEL NIR Upper Limits
  61. GRB 090704: Fermi GBM observation
  62. GRB 090709: ROTSE-III Optical Limits
  63. GRB 090708: Early RAPTOR Optical Limits
  64. GRB 090708, Swift-BAT refined analysis
  65. GRB 090708: ROTSE-III Optical Limits
  66. Possible GRB090705: Swift-XRT observations
  67. GRB 090705: PAIRITEL NIR Observations
  68. XRF 090702 : RTT150 optical observations
  69. GRB 090618: Mondy optical observations
  70. GRB 090529: CrAO optical upper limit
  71. GRB 090529: MTM-500 optical observations
  72. GRB 090529: Mt.Terskol optical observations
  73. XRF 090702: Swift-XRT refined analysis
  74. GRB 090702: UVOT upper limits
  75. GRB 090313: optical observations
  76. XRF 090702: VLT imaging
  77. XRF 090702: Swift-XRT afterglow position
  78. GRB 090404: Deep optical imaging and possible host association (correction)
  79. GRB 090404: Deep optical imaging and possible host association
  80. GRB 090628: Swift XRT refined analysis
  81. GRB 090618: RTT150 optical observations
  82. GRB 090628: Swift/UVOT Upper Limits
  83. Konus-Wind observation of GRB 090626
  84. GRB080628: SAO RAS optical observations
  85. GRB 090628: Swift-BAT refined analysis
  86. GRB090618: 15GHz radio emission faded
  87. GRB 090628: GROND upper limits
  88. GRB 090628: 1.23m CAHA optical observations
  89. GRB 090626: IPN localization
  90. GRB 090628: Swift XRT position
  91. GRB 090628: Swift detection of a burst
  92. Fermi LAT observations of GRB 090626
  93. GRB 090625B: Fermi GBM observation
  94. GRB 090423: Spitzer observations of the z~8.3 burst
  95. GRB 090625B: Swift/UVOT Upper Limits
  96. GRB 090625B: Swift-XRT refined analysis
  97. GRB 090625B: GROND upper limits
  98. GRB 090623: Suzaku WAM observation of the prompt emission
  99. GRB090618: HCT optical observations
  100. GRB 090618: SARA Second Epoch Observations

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