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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"

26305 results found.

  1. Konus-RF and Konus-Wind observations of GRB 090718B
  2. Konus-Wind observations of bright hard GRB 090720B
  3. GRB 090720: Gemini-North Imaging and Optical Afterglow
  4. GRB 090720B: Fermi GBM detection
  5. Swift XRT and UVOT refned analysis of GRB 090720
  6. GRB 090709A: Swift XRT Timing Analysis
  7. GRB 090715B: VLA radio detection
  8. GRB 090720 Source found in ground processing of Swift-BAT data
  9. GRB 090717B: Fermi GBM detection
  10. GRB 090717: Fermi GBM detection
  11. GRB 090719: Fermi GBM detection
  12. GRB 090718B: Fermi GBM detection
  13. GRB 090720: Fermi GBM detection
  14. GRB 090715B: further NOT optical observations
  15. GRB 090715A: Suzaku WAM observation of the prompt emission
  16. Konus-Wind observations of short/hard GRB 090715A
  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: Enhanced Swift-XRT position
  22. GRB 090715B: Observation of the optical afterglow
  23. GRB 090715B: Swift-BAT refined analysis
  24. GRB 090715B: NOT optical observations
  25. Swift problem fixed
  26. GRB 090715B: Swift detection of a burst with a possible optical counterpart
  27. GRB 090715: Swift detection of a short hard burst
  28. Detection of GRB 090618 by RT-2 Experiment onboard the CORONAS-PHOTON Satellite
  29. Swift satellite anomaly
  30. GRB090713 optical limit by "Pi of the Sky"
  31. GRB 090712: Fermi GBM observation
  32. GRB 090713: Fermi GBM detection
  33. GRB 090712: Swift-BAT refined analysis
  34. GRB 090712: Swift detection of a burst
  35. VLA radio observations of GRB 090709A
  36. GRB 090709A: deep optical observation with the 10.4m GTC
  37. GRB 090709A: Suzaku WAM observation of the prompt emission
  38. GRB 090709B: Fermi GBM detection
  39. GRB 090709A: confirmation of the periodicity in the SPI-ACS data
  40. GRB 090709A: evidence for a very red afterglow at low z
  41. Konus-Wind and Konus-RF observations of GRB 090709A
  42. GRB 090709A: Quasiperiodic variations in the BAT light curve
  43. GRB 090709A: RAPTOR Limits During Gamma-Ray Emission
  44. GRB 090709A: Swift XRT Refined Analysis
  45. GRB 090709B, Swift-BAT refined analysis
  46. GRB 090709A: Swift-BAT refined analysis
  47. GRB090709A: High Energy BAT/XRT Analysis Suggests Low to Moderate Redshift
  48. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  49. GRB 090709A: Enhanced Swift-XRT position
  50. GRB 090709B: Swift detection of a burst
  51. GRB 090708 : Fermi GBM detection
  52. GRB 090626: Suzaku WAM observation of the prompt emission
  53. GRB 090704: Fermi GBM observation
  54. GRB 090709: Swift detection of a bright burst
  55. GRB 090708, Swift-BAT refined analysis
  56. GRB 090708: Swift detection of a burst
  57. GRB 090706: Fermi GBM detection
  58. GRB 090705: Swift detection of a possible burst
  59. GRB 090703: Fermi GBM detection
  60. GRB 090313: optical observations
  61. XRF 090702: Swift-XRT afterglow position
  62. XRF 090702: a long soft GRB localized with INTEGRAL
  63. GRB 090404: Deep optical imaging and possible host association
  64. GRB 090701: Fermi GBM detection
  65. GRB 090628: Swift XRT refined analysis
  66. GRB 090630: Fermi GBM detection
  67. GRB 090618: RTT150 optical observations
  68. Konus-Wind observation of GRB 090626
  69. GRB 090628: Swift-BAT refined analysis
  70. GRB 090628: Enhanced Swift-XRT position
  71. GRB 090626: IPN localization
  72. GRB 090628: Swift detection of a burst
  73. GRB 090625B: Fermi GBM observation
  74. GRB 090626: Fermi GBM detection
  75. GRB 090623: Suzaku WAM observation of the prompt emission
  76. GRB 090625B: Swift observation of the INTEGRAL GRB 090625B
  77. GRB 090625B: a long GRB localized by INTEGRAL
  78. GRB 090625: Fermi GBM detection
  79. GRB 090617: Suzaku WAM observation of the prompt emission
  80. GRB 090618: Suzaku WAM observation of the prompt emission
  81. GRB 090621A: Enhanced Swift-XRT position
  82. GRB 090623: Fermi GBM detection
  83. GRB 090621B: GRT Optical Observation
  84. GRB 090621A: GRT Optical Observation
  85. GRB 090621B: Fermi GBM detection
  86. GRB 090621B: I-band observations from 1.23m CAHA
  87. GRB 090621D: Fermi GBM detection
  88. GRB 090621C: Fermi GBM detection
  89. GRB 090621B: P60 Observations
  90. GRB 090621: Fermi GBM observation
  91. GRB 090620: Fermi GBM detecion
  92. Konus-Wind and Konus-RF observations of GRB 090618
  93. GRB 090621B: Swift/UVOT Upper Limits
  94. GRB 090621B: Swift-BAT refined analysis
  95. GRB 090621B: Swift-XRT refined analysis
  96. GRB 090621B: RTT150 optical observations
  97. GRB 090618: RTT150 optical observations
  98. GRB 090621A: Swift-BAT refined analysis
  99. GRB 090621B: Swift detection of a short hard burst
  100. GRB090618: Spectrum and photometry from 6.0m BTA

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