Skip to main content
New! Browse Circulars by Event, Advanced Search, Sample Codes, Schema Release. See news and announcements

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"

24167 results found.

  1. GRB 090726: Swift detection of a burst
  2. Swift Trigger 358354 is not a GRB
  3. Konus-Wind and Konus-RF observations of GRB 090719
  4. Konus-RF and Konus-Wind observations of GRB 090718B
  5. Fermi Gamma-ray Burst Monitor triggers 269935914 through 270021937 are not GRBs
  6. Konus-Wind observations of bright hard GRB 090720B
  7. IPN Triangulation of bright GRB 090720B
  8. GRB 090720: Gemini-North Imaging and Optical Afterglow
  9. GRB 090720B: Fermi GBM detection
  10. Swift XRT and UVOT refned analysis of GRB 090720
  11. GRB 090709A: Swift XRT Timing Analysis
  12. GRB 090720 Source found in ground processing of Swift-BAT data
  13. GRB 090717B: Fermi GBM detection
  14. GRB 090717: Fermi GBM detection
  15. GRB 090719: Fermi GBM detection
  16. GRB 090718B: Fermi GBM detection
  17. GRB 090718: Fermi GBM detection
  18. GRB 090720: Fermi GBM detection
  19. GRB 090715A: Suzaku WAM observation of the prompt emission
  20. GRB 090709A - CARMA mm Observations
  21. GRB 090715A: VLA observations
  22. Konus-Wind observations of short/hard GRB 090715A
  23. GRB 090715B: MASTER optical limit
  24. GRB 090715A: Swift-BAT refined analysis
  25. GRB 090715B: Swift/UVOT followup observations
  26. GRB 090715B: break in the optical afterglow decay
  27. GRB 090715B: Swift XRT Refined Analysis
  28. GRB 090715B: Swift-BAT refined analysis
  29. GRB 090715B - Liverpool Telescope Optical Afterglow Candidate
  30. GRB 090715B: Swift detection of a burst with a possible optical counterpart
  31. GRB 090715A: ROTSE-III Optical Limits
  32. GRB 090715: Swift detection of a short hard burst
  33. Swift satellite anomaly
  34. GRB090713 optical limit by "Pi of the Sky"
  35. GRB 090712: Fermi GBM observation
  36. GRB 090713: Fermi GBM detection
  37. GRB 090712: Swift-BAT refined analysis
  38. GRB 090712: Swift detection of a burst
  39. GRB 090709A: Xinglong TNT optical upper limit
  40. GRB 090709A: Suzaku WAM observation of the prompt emission
  41. GRB 090709A: Swift UVOT upper limits
  42. GRB 090709B: Fermi GBM detection
  43. GRB 090709A: confirmation of the periodicity in the SPI-ACS data
  44. GRB 090709A: P60 Observations
  45. GRB 090709A: Quasiperiodic variations in the BAT light curve
  46. GRB 090709A: NOT optical observations
  47. GRB 090709A: RAPTOR Limits During Gamma-Ray Emission
  48. GRB 090709A: Swift XRT Refined Analysis
  49. GRB 090709B, Swift-BAT refined analysis
  50. GRB 090709A: Swift-BAT refined analysis
  51. GRB090709A: High Energy BAT/XRT Analysis Suggests Low to Moderate Redshift
  52. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  53. GRB 090709A, RIMOTS optical upper limits
  54. GRB 090709B: Swift detection of a burst
  55. GRB 090708 : Fermi GBM detection
  56. GRB 090626: Suzaku WAM observation of the prompt emission
  57. GRB 090709: PAIRITEL NIR Upper Limits
  58. GRB 090704: Fermi GBM observation
  59. GRB 090709: ROTSE-III Optical Limits
  60. GRB 090709: Swift detection of a bright burst
  61. GRB 090708: Early RAPTOR Optical Limits
  62. GRB 090708, Swift-BAT refined analysis
  63. GRB 090708: ROTSE-III Optical Limits
  64. GRB 090708: Swift detection of a burst
  65. GRB 090704: a long GRB found in INTEGRAL off-line analysis
  66. GRB 090706: Fermi GBM detection
  67. Swift-BAT trigger 356516 is not a GRB
  68. Possible GRB090705: Swift-XRT observations
  69. GRB 090705: PAIRITEL NIR Observations
  70. GRB 090705: Swift detection of a possible burst
  71. GRB 090703: Fermi GBM detection
  72. GRB 090702: UVOT upper limits
  73. XRF 090702: Swift-XRT afterglow position
  74. GRB 090701: Fermi GBM detection
  75. GRB 090628: Swift XRT refined analysis
  76. GRB 090630: Fermi GBM detection
  77. GRB 090628: Swift/UVOT Upper Limits
  78. Konus-Wind observation of GRB 090626
  79. GRB080628: SAO RAS optical observations
  80. GRB 090628: Swift-BAT refined analysis
  81. GRB 090628: GROND upper limits
  82. GRB 090626: IPN localization
  83. GRB 090628: Swift/UVOT Finding Chart Observation
  84. GRB 090628: Swift XRT position
  85. GRB 090628: Swift detection of a burst
  86. Fermi LAT observations of GRB 090626
  87. GRB 090625B: Fermi GBM observation
  88. GRB 090625B: Swift-XRT refined analysis
  89. GRB 090626: Fermi GBM detection
  90. GRB 090623: Suzaku WAM observation of the prompt emission
  91. GRB 090618: SARA Second Epoch Observations
  92. GRB 090625B: Faulkes Telescope South observations
  93. GRB 090625: Fermi GBM detection
  94. GRB 090617: Suzaku WAM observation of the prompt emission
  95. GRB 090623: Fermi GBM detection
  96. GRB 090621B: GRT Optical Observation
  97. GRB 090621A: GRT Optical Observation
  98. PAIRITEL observations of GRB 090618
  99. GRB 090621B: Fermi GBM detection
  100. GRB 090621D: Fermi GBM detection

Advanced

Download all Circulars as a .tar.gz archive:
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