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"

42438 results found.

  1. SGR 1834.9-0846/ GRB 110807A, I-band observations
  2. Konus-Wind observation of GRB 110808B
  3. Konus-Wind observation of GRB 110808A
  4. A new photometric resource for GRB observers
  5. RXTE Discovery of the Spin Period of Swift J1834.9-0846
  6. GRB 110808A: Swift/UVOT Detection
  7. GRB 110808A: Swift-BAT refined analysis
  8. GRB 110808A: Swift-XRT refined Analysis
  9. SGR J1834.9-0846: A Neutron Star in W41?
  10. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  11. GRB 110808A: VLT/X-shooter spectroscopy
  12. GRB 110808A: Enhanced Swift-XRT position
  13. GRB 110808A: Swift detection of a burst with optical counterpart
  14. Fermi GBM detection of a SGR-like burst
  15. GRB 110807A: SAO RAS observations
  16. GRB 110807A: Swift detection of a burst or a posible new SGR
  17. GRB 110726A: two epochs of SAO RAS optical observations
  18. Reprocessed enhanced Swift-XRT positions and GRB products
  19. Konus-Wind observation of GRB 110802A
  20. GRB 110801A: optical observations in CrAO
  21. EVLA observation for Fermi burst GRB 110721A
  22. GRB 110731A : Suzaku WAM observation of the prompt emission
  23. GRB 110726A: Swift-XRT refined Analysis
  24. GRB110731A: MOA optical observations of the steeply fading afterglow
  25. GRB 110801A: SAO RAS optical observations
  26. GRB110801A: MITSuME Ishigakijima Optical Observation at 1 day after the burst
  27. GRB 110801A: Evidence for a jet break
  28. GRB 110801A: MASTER OT observations
  29. GRB 110801A: Swift-BAT refined analysis
  30. Swift/UVOT observations of GRB110801A
  31. GRB 110801A: Swift-XRT refined Analysis
  32. GRB 110801A: Afterglow redshift from 10.4m GTC
  33. GRB110801A: MITSuME Ishigakijima Optical Observation
  34. GRB 110801A: Enhanced Swift-XRT position
  35. GRB 110801A: TLS Optical afterglow confirmation
  36. GRB 110801A: Swift detection of a burst with an optical counterpart
  37. GRB 110731A / EVLA upper limits
  38. GRB110731A: MITSuME Ishigakijima Optical Upper Limits
  39. GRB 110731A Gemini-N redshift
  40. GRB 110731A: Swift-XRT refined Analysis
  41. Konus-Wind observation of GRB 110731A
  42. GRB110731A: Swift/UVOT Observations
  43. GRB 110731A: Fermi GBM observation
  44. GRB 110731A: NOT photometry
  45. GRB 110731A: Enhanced Swift-XRT position
  46. Fermi-LAT Detection of GRB110731A
  47. GRB 110731A: Swift-BAT refined analysis
  48. GRB 110731A: FTN+FTS afterglow observations
  49. GRB 110731A: Swift detection of a burst with an optical counterpart
  50. Sw J1644+57 (GRB 110328A): Continued VLBA Observations
  51. INTEGRAL Weak trigger #6331: GRT Optical Observation
  52. GRB 110721A: Swift observations of afterglow candidate
  53. GRB 110726A: optical upper limit in CrAO
  54. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  55. GRB 110726A: EVLA observations
  56. GRB 110726A: IAC80 R-band observations
  57. GRB 110726A: ROTSE-III refined analysis, fast decay in early phase
  58. GRB110726A: MITSuME Ishigakijima Optical Observation
  59. GRB 110726A: Further Swift/UVOT Observations
  60. GRB110726A: Gemini-N tentative redshift
  61. GRB 110726A: Swift-BAT refined analysis
  62. GRB 110726A: Enhanced Swift-XRT position
  63. GRB 110726A: Swift/UVOT Detection
  64. GRB 110726A: Liverpool Telescope observations
  65. GRB 110726: ROTSE-III Detection of Optical Counterpart
  66. GRB 110726A: Swift detection of a burst
  67. GRB 110721A: Preliminary Swift/UVOT Upper Limits
  68. GRB 110721A: Gemini-South spectroscopy of the potential optical counterpart
  69. GRB 110721A: potential counterpart candidate
  70. Konus-Wind observation of GRB 110721A
  71. GRB 110709B / EVLA detection of radio counterpart
  72. GRB 110719A / SMA 345 GHz upper limits
  73. GRB 110721A: Fermi-LAT detection
  74. GRB 110721A: Fermi GBM detection
  75. GRB110715A: spectral lag analysis
  76. GRB 110715A : Suzaku WAM observation of the prompt emission
  77. GRB 110719A: GRT Optical Observation
  78. GRB 110719A: optical limit by "Pi of the Sky"
  79. GRB 110719A: z-band upper limit
  80. Swift/UVOT observations of GRB110719A
  81. Swift J1822.3-1606 : Fermi GBM observation
  82. GRB 110719A: Swift-XRT refined Analysis
  83. GRB 110719A: optical upper limit
  84. GRB 110719A: Enhanced Swift-XRT position
  85. GRB 110719A: Swift-BAT refined analysis
  86. GRB 110715A optical observations
  87. GRB 110719A: Swift detection of a burst
  88. GRB 110709B : Suzaku WAM observation of the prompt emission
  89. GRB 110715A: ATCA detection of the radio counterpart
  90. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  91. GRB110715A: GROND Detection of the Optical/NIR Afterglow
  92. GRB 110715A: APEX detection of the submm counterpart
  93. Swift J1822.3-1606
  94. Konus-Wind observation of GRB 110715A
  95. GRB 110715A: Swift-XRT refined Analysis
  96. GRB110715A: VLT redshift
  97. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  98. GRB 110715A: Swift/UVOT Detection
  99. GRB 110715A: Enhanced Swift-XRT position
  100. GRB 110715A: Swift-BAT refined analysis

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