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"

45705 results found.

  1. GRB 120328A: Swift detection of a burst
  2. GRB 120327A: GTC redshift confirmation
  3. GRB 120326A: Fermi GBM Observation
  4. GRB 120327A afterglow detection
  5. GRB 120326A: PAIRITEL NIR Observations
  6. GRB 120326A: Bassano Bresciano Observatory optical observations
  7. GRB 120327A: Swift-XRT refined Analysis
  8. GRB 120327A: CQUEAN grizY Observation
  9. GRB 120326A: LOAO R-band Observations
  10. GRB 120327A: Swift/UVOT further analysis
  11. GRB 120327A: Swift-BAT refined analysis
  12. GRB 120326A : SMA submm observation
  13. GRB 120327A: Enhanced Swift-XRT position
  14. GRB 120327A: X-shooter redshift
  15. GRB 120327A: Gemini-South redshift
  16. GRB 120327A: TAROT La Silla observatory optical decay
  17. GRB120326A: TNT optical observation
  18. GRB 120327A: IAC80 I-band observations
  19. GROND observations of GRB 120327A
  20. GRB 120327A: REM NIR and optical observations
  21. Skynet/PROMPT observations of GRB120327A
  22. GRB 120326A: Maisoncelles Observatory optical observations
  23. GRB 120327A: Liverpool Telescope Observations
  24. GRB 120327A: TAROT La Silla observatory optical detection
  25. GRB 120327A: Swift detection of a burst with an optical counterpart
  26. GRB 120326A: optical observation of GMG
  27. GRB 120326A : LOT optical observation
  28. GRB 120326A: Swift-BAT refined analysis
  29. GRB 120326A: T17 optical observations
  30. GRB 120326A: GTC redshift
  31. GRB 120326A: CQUEAN grizY Observation
  32. GRB 120323A: MASTER follow up observations
  33. GRB 120326A: Swift-XRT refined Analysis
  34. GRB 120326A: Swift/UVOT Detection
  35. GRB 120326A: Optical observations at Crni Vrh
  36. GRB120326A: IAC80 observations
  37. GRB 120326A: Liverpool Telescope observations
  38. GRB 120326A: Enhanced Swift-XRT position
  39. Skynet/Dolomiti Observations of GRB120326A
  40. GRB 120326A: TAROT Calern observatory afterglow optical decay
  41. GRB 120326A: TAROT Calern observatory afterglow optical detection
  42. GRB 120326A: ROTSE-III Optical Limits
  43. GRB 120326A: Swift detection of a burst
  44. GRB 120323A: Fermi LAT observations
  45. Konus-Wind observation of GRB 120323A
  46. IPN Triangulation of GRB 120323A (short/very intense)
  47. GRB 120324A: Swift-XRT refined Analysis
  48. Konus-Wind observation of GRB 120324A
  49. GRB 120323A: Fermi GBM detection
  50. GRB 120324A: GROND observations
  51. GRB 120324A: CQUEAN rizY Observation
  52. GRB 120324A: Swift-BAT refined analysis
  53. GRB 120324A: Swift/UVOT Upper Limits
  54. GRB 120324A: TAROT La Silla observatory optical observations
  55. GRB 120324A: Enhanced Swift-XRT position
  56. GRB 120324A: Liverpool Telescope optical candidate
  57. GRB 120324A: UVOT Finding Chart Observation
  58. GRB 120324A: Swift detection of a burst
  59. Simultaneous optical images of Swift pointing are available by GRT
  60. GRB 120316A : Suzaku WAM observation of the prompt emission
  61. GRB 120320A: Zadko optical observations
  62. GRB 120320A, the review of the sky area in plate archives
  63. GRB 120316A: Fermi-GBM and Fermi-LAT Observations
  64. GRB 120229A: Magellan observations and limit on an optical afterglow
  65. GRB 120320A: Swift/UVOT Upper Limits
  66. GRB 120320A: MITSuME Okayama Optical upper limits
  67. GRB 120320A , optical observations
  68. GRB 120320A: BOOTES-4 optical upper limit
  69. GRB 120320A: Swift-XRT refined Analysis
  70. GRB 120320A, Swift-BAT refined analysis
  71. GRB 120320A: Gemini-N and UKIRT observations
  72. Fermi GBM trigger 120319.237 is not a GRB
  73. GRB 120320A: Enhanced Swift-XRT position
  74. Konus-Wind observation of GRB 120316A
  75. IPN Triangulation of GRB 120316A
  76. GRB 120320A: MASTER optical observations
  77. GRB 120320A: Swift detection of a burst
  78. GBM trigger 353549464 (GRB 120316A?) : High-energy photon emission in Fermi/LAT data
  79. GRB 111228A: possible detection of the SN with the TNG
  80. Trigger 517876 is a Swift detection of GX 5-1
  81. GRB 120302A: Swift XRT refined analysis
  82. GRB 120312A, the review of the sky area in plate archives
  83. GRB 120312A: CrAO optical upper limit
  84. GRB 120312A: Gemini and UKIRT imaging
  85. GRB 120311A, the review of the sky area in plate archives
  86. Fermi GBM triggers 120309.265 and 120309.402 are not GRBs
  87. Fermi GBM triggers 120305.186, 120305.802 and 120306.823 are not GRBs
  88. GRB 120311A: Optical follow-up
  89. GRB 120311B: Optical follow-up
  90. GRB 120311A: C88 optical limits
  91. GRB 120312A: Swift/UVOT Upper Limits
  92. GRB 120312A: MASTER-NET optical observations
  93. GRB 120312A: WHT candidate afterglow
  94. GRB 120312A: NOT observations
  95. GRB 120312A: Swift-XRT refined Analysis
  96. GRB 120312A: Swift-BAT refined analysis
  97. GRB 120311A: VLT/X-shooter observations
  98. GRB 120311B: C88 optical limits
  99. GRB 120312A: Swift detection of a burst
  100. GROND observations of GRB 120311A

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