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"

28261 results found.

  1. GRB 120422A: Enhanced Swift-XRT position
  2. GRB 120422A: Swift-BAT refined analysis
  3. GRB 120422A: Gemini observations
  4. GRB 120422A: Faulkes Telescope North observations
  5. GRB 120422A: Swift detection of a burst
  6. GRB 120419A: Swift-XRT and UVOT observations
  7. GRB 120419A: A long GRB detected by INTEGRAL
  8. SGR1806-20, Swift-BAT refined analysis (Trigger 519868)
  9. Swift Trigger 519874 is probably a noise event
  10. Trigger 519868: Swift detection of SGR1806-20
  11. GRB 120404A: optical observations in Mondy observatory
  12. GRB 120404A: optical observations
  13. GRB 120404A, Optical Observations
  14. GRB 120404A: MASTER OT observations
  15. GRB120404A: GROND observations show steeply decaying afterglow
  16. GRB120404A: MOA optical observations of the initial rise afterglow
  17. GRB 120404A: VLT/X-shooter redshift confirmation
  18. GRB 120404A: Swift/UVOT Detection
  19. GRB 120404A: MITSuME Ishigakijima Optical Observation
  20. GRB 120404A: MITSuME Okayama Optical Observation
  21. GRB 120403B: Swift-XRT refined Analysis
  22. GRB 120404A: Swift-XRT refined Analysis
  23. GRB 120404A: Swift-BAT refined analysis
  24. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
  25. GRB 120404A: Enhanced Swift-XRT position
  26. GRB 120402B: MASTER early OT limit
  27. GRB 120403B: TAROT La Silla observatory optical observations
  28. GRB 120403B: Fermi GBM Observation
  29. GRB 120404A: Gemini-N Redshift
  30. GRB 120403B: AAT nIR observations
  31. GRB 120404A: Faulkes Telescope North afterglow confirmation
  32. GRB 120404A: Swift detection of a burst with an optical counterpart
  33. GRB 120403B: Swift-BAT refined analysis
  34. GRB 120403B: Swift/UVOT Upper Limits
  35. GRB 120403B: Enhanced Swift-XRT position
  36. GRB 120403A: Swift/BAT spectral lag analysis
  37. GRB 120403B: Swift detection of a burst
  38. BAT trigger 519207 was a burst from Cyg X-1, was not GRB 120402A
  39. GRB 120326A, the review of the sky area in plate archives
  40. GRB 120402A: optical upper limit
  41. GRB 120320A: optical upper limit in Mondy observatory
  42. GRB 120320A: early optical upper limit
  43. GRB 120403A, Swift-BAT refined analysis
  44. GRB 120402B: Fermi GBM detection
  45. GRB 120328B: Pi of the Sky simultaneous upper limits
  46. GRB 120326A: Bassano Bresciano Observatory - correction for GCN Cir 13178
  47. GRB 120402A: Swift detection of a possible burst or noise
  48. GRB 120326A: Cima Rest and Bassano Brescia
  49. GRB 120327A: SMARTS optical/IR afterglow observations
  50. GRB 120401A: Swift-XRT refined Analysis
  51. GRB 120401A: Swift-BAT refined analysis
  52. GRB 120401A: Enhanced Swift-XRT position
  53. GRB 120401A: Swift detection of a burst
  54. GRB 120324A: CrAO optical upper limit
  55. GRB 120326A: Bassano Bresciano Observatory lightcurve analisis
  56. GRB 120326A: MITSuME Ishigakijima Optical Observation at 3 days afterthe burst
  57. GRB 120326A : Suzaku WAM observation of the prompt emission
  58. GRB 120324A, the review of the sky area in plate archives
  59. GRB 120326A: Bassano Bresciano Observatory optical observations
  60. GRB 120328A: MITSuME Ishigakijima Optical Upper Limits
  61. GRB 120326A: MITSuME Ishigakijima Optical Observation at 2 days afterthe burst
  62. GRB 120327A: MITSuME Ishigakijima Optical Upper Limits at 1 day afterthe burst
  63. Swift trigger 518853: MASTER-ICATE possible OT
  64. The Swift-XRT source associated with trigger 518853 is a cosmic ray
  65. Trigger 518853: Swift detection of a probable Galactic transient
  66. GRB 120328B: Fermi-LAT Observations
  67. GRB 120327A: Zadko optical observations
  68. GRB 120328B: Fermi GBM detection
  69. GRB 120328A: Swift/UVOT Upper Limits
  70. GRB 120328A: Swift-XRT refined Analysis
  71. IPN Triangulation of GRB 120328B (long/intense)
  72. GRB 120327A: MITSuME Ishigakijima Optical Observation
  73. GRB 120326A: MITSuME Ishigakijima Optical Observation
  74. GRB 120328A: Swift-BAT refined analysis
  75. GRB 120328A: Enhanced Swift-XRT position
  76. GRB 120327A: NOT optical observations
  77. GRB 120328A: TAROT La Silla observatory optical observations
  78. Skynet/PROMPT observations of GRB120328A
  79. GRB 120328A: Swift detection of a burst
  80. GRB 120326A: Fermi GBM Observation
  81. GRB 120327A afterglow detection
  82. GRB 120326A: PAIRITEL NIR Observations
  83. GRB 120326A: Bassano Bresciano Observatory optical observations
  84. GRB 120327A: Swift-XRT refined Analysis
  85. GRB 120326A: LOAO R-band Observations
  86. GRB 120327A: Swift/UVOT further analysis
  87. GRB 120327A: Swift-BAT refined analysis
  88. GRB 120326A : SMA submm observation
  89. GRB 120327A: Enhanced Swift-XRT position
  90. GRB 120327A: X-shooter redshift
  91. GROND observations of GRB 120327A
  92. GRB 120327A: REM NIR and optical observations
  93. Skynet/PROMPT observations of GRB120327A
  94. GRB 120327A: Liverpool Telescope Observations
  95. GRB 120327A: TAROT La Silla observatory optical detection
  96. GRB 120327A: Swift detection of a burst with an optical counterpart
  97. GRB 120326A : LOT optical observation
  98. GRB 120326A: Swift-BAT refined analysis
  99. GRB 120326A: Swift-XRT refined Analysis
  100. GRB 120326A: Swift/UVOT 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