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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"

26299 results found.

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

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