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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"

25476 results found.

  1. GRB090713 optical limit by "Pi of the Sky"
  2. GRB 090712: Fermi GBM observation
  3. GRB 090713: Fermi GBM detection
  4. GRB 090712: Swift-BAT refined analysis
  5. GRB 090712: Swift detection of a burst
  6. VLA radio observations of GRB 090709A
  7. GRB 090709A: deep optical observation with the 10.4m GTC
  8. GRB 090709A: Suzaku WAM observation of the prompt emission
  9. GRB 090709B: Fermi GBM detection
  10. GRB 090709A: confirmation of the periodicity in the SPI-ACS data
  11. GRB 090709A: evidence for a very red afterglow at low z
  12. Konus-Wind and Konus-RF observations of GRB 090709A
  13. GRB 090709A: Quasiperiodic variations in the BAT light curve
  14. GRB 090709A: RAPTOR Limits During Gamma-Ray Emission
  15. GRB 090709A: Swift XRT Refined Analysis
  16. GRB 090709B, Swift-BAT refined analysis
  17. GRB 090709A: Swift-BAT refined analysis
  18. GRB090709A: High Energy BAT/XRT Analysis Suggests Low to Moderate Redshift
  19. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  20. GRB 090709A: Enhanced Swift-XRT position
  21. GRB 090709B: Swift detection of a burst
  22. GRB 090708 : Fermi GBM detection
  23. GRB 090626: Suzaku WAM observation of the prompt emission
  24. GRB 090704: Fermi GBM observation
  25. GRB 090709: Swift detection of a bright burst
  26. GRB 090708, Swift-BAT refined analysis
  27. GRB 090708: Swift detection of a burst
  28. GRB 090706: Fermi GBM detection
  29. GRB 090705: Swift detection of a possible burst
  30. GRB 090703: Fermi GBM detection
  31. GRB 090313: optical observations
  32. XRF 090702: Swift-XRT afterglow position
  33. XRF 090702: a long soft GRB localized with INTEGRAL
  34. GRB 090404: Deep optical imaging and possible host association
  35. GRB 090701: Fermi GBM detection
  36. GRB 090628: Swift XRT refined analysis
  37. GRB 090630: Fermi GBM detection
  38. GRB 090618: RTT150 optical observations
  39. Konus-Wind observation of GRB 090626
  40. GRB 090628: Swift-BAT refined analysis
  41. GRB 090628: Enhanced Swift-XRT position
  42. GRB 090626: IPN localization
  43. GRB 090628: Swift detection of a burst
  44. GRB 090625B: Fermi GBM observation
  45. GRB 090626: Fermi GBM detection
  46. GRB 090623: Suzaku WAM observation of the prompt emission
  47. GRB 090625B: Swift observation of the INTEGRAL GRB 090625B
  48. GRB 090625B: a long GRB localized by INTEGRAL
  49. GRB 090625: Fermi GBM detection
  50. GRB 090617: Suzaku WAM observation of the prompt emission
  51. GRB 090618: Suzaku WAM observation of the prompt emission
  52. GRB 090621A: Enhanced Swift-XRT position
  53. GRB 090623: Fermi GBM detection
  54. GRB 090621B: GRT Optical Observation
  55. GRB 090621A: GRT Optical Observation
  56. GRB 090621B: Fermi GBM detection
  57. GRB 090621B: I-band observations from 1.23m CAHA
  58. GRB 090621D: Fermi GBM detection
  59. GRB 090621C: Fermi GBM detection
  60. GRB 090621B: P60 Observations
  61. GRB 090621: Fermi GBM observation
  62. GRB 090620: Fermi GBM detecion
  63. Konus-Wind and Konus-RF observations of GRB 090618
  64. GRB 090621B: Swift/UVOT Upper Limits
  65. GRB 090621B: Swift-BAT refined analysis
  66. GRB 090621B: Swift-XRT refined analysis
  67. GRB 090621B: RTT150 optical observations
  68. GRB 090618: RTT150 optical observations
  69. GRB 090621A: Swift-BAT refined analysis
  70. GRB 090621B: Swift detection of a short hard burst
  71. GRB090618: Spectrum and photometry from 6.0m BTA
  72. GRB 090618: BOAO V-band Observation
  73. GRB 090621: Swift detection of a burst
  74. GRB090618, underlying supernova search
  75. GRB090618: OAA-OAUV Optical observations
  76. GRB 090618: Fermi GBM observation
  77. GRB 090618, Swift-BAT refined spectral analysis
  78. VLA radio detection of GRB 090618
  79. GRB090618 - Continued optical monitoring and light curve break
  80. GRB 090618: Swift-BAT refined analysis
  81. GRB090618: Swift-XRT team refined analysis
  82. GRB090618: Swift/UVOT bright afterglow detection
  83. GRB 090618: SDSS host detection
  84. GRB 090618: AGILE observations
  85. GRB 090617: Fermi GBM detection
  86. GRB 090618: LOAO R-band Observation
  87. GRB 090618: Enhanced Swift-XRT position
  88. GRB 090618 Faulkes Telescope North observations
  89. GRB 090618: Swift detection of a bright burst with optical afterglow
  90. GRB 090616: Fermi GBM detection
  91. GRB 090612: Fermi GBM detection
  92. GRB 090610C: Fermi GBM detection
  93. GRB 090610B: Fermi GBM detection
  94. GRB 090610: Fermi GBM detection
  95. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  96. GRB 090602: Suzaku WAM observation of the prompt emission
  97. GRB 090531B: Fermi GBM detection
  98. Konus-RF observation of SGR burst 090605A
  99. Discovery of a new soft gamma repeater source, SGR 0418+5729
  100. GRB 090608: Fermi GBM detection

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