Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

37803 results found.

  1. GRB090709A: High Energy BAT/XRT Analysis Suggests Low to Moderate Redshift
  2. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  3. GRB 090709A, RIMOTS optical upper limits
  4. GRB 090709A: Enhanced Swift-XRT position
  5. GRB 090709A - PAIRITEL Discovery of a Red Afterglow
  6. GRB 090709A: Subaru NIR observation
  7. GRB 090709B: Swift detection of a burst
  8. GRB 090709 : planned Suzaku-ToO observation
  9. GRB 090708 : Fermi GBM detection
  10. GRB 090709: Faulkes Telescope North Upper Limits
  11. GRB 090626: Suzaku WAM observation of the prompt emission
  12. GRB 090709: PAIRITEL NIR Upper Limits
  13. GRB 090704: Fermi GBM observation
  14. GRB 090709: ROTSE-III Optical Limits
  15. GRB 090709: Swift detection of a bright burst
  16. GRB 090708: Early RAPTOR Optical Limits
  17. GRB 090708, Swift-BAT refined analysis
  18. GRB 090708: ROTSE-III Optical Limits
  19. GRB 090708: Swift detection of a burst
  20. GRB 090704: a long GRB found in INTEGRAL off-line analysis
  21. GRB 090706: Fermi GBM detection
  22. Swift-BAT trigger 356516 is not a GRB
  23. Possible GRB090705: Swift-XRT observations
  24. GRB 090705: PAIRITEL NIR Observations
  25. GRB 090705: Swift detection of a possible burst
  26. XRF 090702 : RTT150 optical observations
  27. GRB 090618: Mondy optical observations
  28. GRB 090529: CrAO optical upper limit
  29. GRB 090529: MTM-500 optical observations
  30. GRB 090529: Mt.Terskol optical observations
  31. XRF 090702: Swift-XRT refined analysis
  32. GRB 090703: Fermi GBM detection
  33. GRB 090702: UVOT upper limits
  34. GRB 090313: optical observations
  35. XRF 090702: VLT imaging
  36. XRF 090702: Swift-XRT afterglow position
  37. XRF 090702: a long soft GRB localized with INTEGRAL
  38. GRB 090404: Deep optical imaging and possible host association (correction)
  39. GRB 090404: Deep optical imaging and possible host association
  40. GRB 090701: Fermi GBM detection
  41. GRB 090628: Swift XRT refined analysis
  42. GRB 090630: Fermi GBM detection
  43. GRB 090618: RTT150 optical observations
  44. GRB 090628: Swift/UVOT Upper Limits
  45. Konus-Wind observation of GRB 090626
  46. GRB080628: SAO RAS optical observations
  47. GRB 090628: Swift-BAT refined analysis
  48. GRB 090628: GROND upper limits
  49. GRB 090628: Enhanced Swift-XRT position
  50. GRB 090628: 1.23m CAHA optical observations
  51. GRB 090626: IPN localization
  52. GRB 090628: Swift/UVOT Finding Chart Observation
  53. GRB 090628: Swift XRT position
  54. GRB 090628: Swift detection of a burst
  55. Fermi LAT observations of GRB 090626
  56. GRB 090625B: Fermi GBM observation
  57. GRB 090423: Spitzer observations of the z~8.3 burst
  58. GRB 090625B: Swift/UVOT Upper Limits
  59. GRB 090625B: Swift-XRT refined analysis
  60. GRB 090626: Fermi GBM detection
  61. GRB 090625B: GROND upper limits
  62. GRB 090623: Suzaku WAM observation of the prompt emission
  63. GRB090618: HCT optical observations
  64. GRB 090618: SARA Second Epoch Observations
  65. GRB 090625B: Faulkes Telescope South observations
  66. GRB 090625B: Swift observation of the INTEGRAL GRB 090625B
  67. GRB 090625B: a long GRB localized by INTEGRAL
  68. GRB 090625: Fermi GBM detection
  69. GRB 090618: Correction to GCN 9568
  70. GRB 090617: Suzaku WAM observation of the prompt emission
  71. GRB 090618: Suzaku WAM observation of the prompt emission
  72. GRB 090621A: Enhanced Swift-XRT position
  73. GRB 090623: Fermi GBM detection
  74. GRB 090621B: GRT Optical Observation
  75. GRB 090621A: GRT Optical Observation
  76. PAIRITEL observations of GRB 090618
  77. GRB 090621B: Fermi GBM detection
  78. GRB 090621B: I-band observations from 1.23m CAHA
  79. GRB 090621D: Fermi GBM detection
  80. GRB 090621B: Gemini spectrum of afterglow candidate
  81. GRB 090621C: Fermi GBM detection
  82. GRB 090621B: P60 Observations
  83. GRB 090621: Fermi GBM observation
  84. GRB 090621B: VLA observations
  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 090621B: Optical Observations
  93. GRB 090621A: Swift-BAT refined analysis
  94. GRB 090621B: Swift detection of a short hard burst
  95. GRB 090621: Swift/UVOT Upper Limits
  96. GRB 090621: Swift-XRT Team refined analysis
  97. GRB 090618: BOAO V-band Observation
  98. GRB 090621: Swift detection of a burst
  99. GRB 090618: ZTSh optical observations
  100. GRB 090618 : WSRT radio detection

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov