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"

23611 results found.

  1. GRB 070107: Swift detection of a burst
  2. GRB070103: APO SPIcam i' and z' limits
  3. GRB 061201: Nearby Galaxy Cluster Abell 995 is at z=0.0865
  4. GRB070103: KPNO 4m+FLAMINGOS J limit
  5. GRB 070103, Swift-BAT refined analysis
  6. GRB 070103: TAROT Calern observatory optical observations
  7. GRB 070103: Swift detection of a burst
  8. Konus-Wind observation of GRB 061222A
  9. GRB 061210: Swift/XRT Astrometry Correction
  10. GRB 061222B: TAROT La Silla observatory early optical observations
  11. GRB 061218: TAROT La Silla observatory early optical observations
  12. GRB 061222B, Swift-BAT refined analysis
  13. GRB 061222B: Observation with the KANATA 1.5m telescope
  14. GRB 061222A: Observation with the KANATA 1.5m telescope
  15. GRB 061222B: BOOTES-IR optical observations
  16. GRB 061222A, Swift-BAT refined analysis
  17. GRB 061222B: TAROT La Silla observatory afterglow observation
  18. GRB 061222B: TAROT La Silla observatory optical observations
  19. GRB 061222B: Swift detection of a burst
  20. GRB 061222: Swift detection of a burst
  21. GRB 061217: Astrometry-Corrected XRT Position
  22. GRB 061217: Confirmation of host candidate
  23. GRB 061217: Extended object in the revised XRT error circle
  24. GRB 061217, Candidate host galaxy
  25. GRB 061210: Possible Host Galaxy (S2-G2) Keck Spectrum
  26. GRB 061201: Magellan Redshift of nearby Abell cluster
  27. GRB 061218: TAROT La Silla observatory optical observations
  28. GRB 061217: TAROT Calern observatory optical observations
  29. GRB 061218, Swift-BAT refined analysis
  30. GRB 061218, SMARTS optical/IR observations
  31. Swift triggers (#251863) on a possible burst
  32. GRB061217: Swift/UVOT refined analysis.
  33. GRB 061217: optical observations at Calar Alto
  34. GRB 061217, Swift-BAT refined analysis
  35. GRB 061217: Magellan Observations
  36. GRB 061217: Swift detection of a short hard burst
  37. Swift-BAT Trigger 250908 is a Cosmic Ray Shower event
  38. GRB 061210 : Faulkes North Telescope optical limit
  39. GRB 061214(?): Swift detection of a possible burst
  40. GRB 061210: Suzaku WAM observation of the prompt emission
  41. GRB 061213: MASTER-VWF-Kislovodsk optical candidate
  42. GRB 061213: MASTER-VWF-Kislovodsk observations
  43. GRB 061126: a GRB detected off-axis by INTEGRAL
  44. GRB 061202: Suzaku WAM observation of the prompt emission
  45. GRB 061210, Swift-BAT refined analysis of the SHB
  46. GRB 061210: Swift-BAT detection of a short burst
  47. Optical Afterglow observations of GRB 061126
  48. GRB061126: optical observations
  49. GRB 060926: MASTER: discovery of the optical flare
  50. GRB 061201: SOAR Confirmation of Candidate Afterglow
  51. GRB 061202: Swift XRT refined analysis
  52. Konus-Wind observation of GRB 061201
  53. GRB 061202, Swift-BAT refined analysis
  54. GRB 061202: Swift detection of a burst
  55. GRB 061201: Swift XRT Team refined analysis
  56. GRB 061201, Swift-BAT refined analysis of the SHB
  57. GRB 061201: Swift detection of a short hard burst
  58. GRB 061126: Possible Jet Break
  59. Swift XRT on-board boresight update
  60. GRB 061126: Early Super-LOTIS Observations
  61. RHESSI Spectrum of GRB061126
  62. GRB061126: Optical afterglow observations from MIRO
  63. GRB061126: Optical afterglow observations from MIRO
  64. GRB 061126 : SDSS Pre-Burst Observations
  65. GRB 061126: Swift-XRT refined analysis
  66. GRB 061126, Swift-BAT refined analysis
  67. GRB 061126: SARA Observations
  68. GRB 061126: Faulkes Telescope North Optical Observations
  69. GRB 061126: XRT position
  70. GRB 061126: Swift detection of a burst
  71. GRB 061121: Ep,i - Eiso correlation
  72. Konus-Wind observation of GRB 061122
  73. RHESSI Spectrum of GRB061121
  74. Konus-Wind and Konus-A observations of GRB 061121
  75. INTEGRAL results on GRB 061122
  76. Swift-BAT trigger 239987 is not a GRB
  77. GRB 061122A: a long GRB detected by INTEGRAL
  78. GRB 061121, Swift-BAT refined analysis
  79. GRB061121, optical observation
  80. GRB 061121: Optical observation at the KANATA 1.5m telescope
  81. GRB 061121: Faulkes Telescope North Optical Observation
  82. GRB 061121: Swift detection of a bright burst with an optical counterpart
  83. Swift-BAT triggers 238544 and 238546 are not GRBs
  84. GRB 061110A - VLT tentative redshift
  85. GRB 061110B, Swift-BAT refined analysis
  86. GRB 061110B : Liverpool Telescope Optical Afterglow Detection
  87. GRB 061110B: Swift-UVOT Initial Observation
  88. GRB 061110A, Swift-BAT refined analysis
  89. GRB 061110B: TAROT Calern observatory optical observations
  90. GRB 061110B: Swift detection of a burst
  91. GRB 061110 : Optical afterglow candidate
  92. GRB 061110: Swift detection of a burst
  93. Swift-BAT Trigger 237821 is a Cosmic Ray Shower event
  94. GRB 061109: TAROT Calern observatory optical observations
  95. GRB 061109: Swift detection of a possible burst
  96. GRB061028: MAGIC telescope GeV observation
  97. GRB 061027: TAROT La Silla observatory optical observations
  98. GRB 061007: Third Epoch ATCA Radio Observations
  99. Swift-BAT Trigger 236481 is a Cosmic Ray Shower event
  100. GRB 061028: Optical R passband observations

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