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"

42809 results found.

  1. Simultaneous optical images of Swift pointing are available by GRT
  2. GRB 120316A : Suzaku WAM observation of the prompt emission
  3. GRB 120320A: Zadko optical observations
  4. GRB 120320A, the review of the sky area in plate archives
  5. GRB 120316A: Fermi-GBM and Fermi-LAT Observations
  6. GRB 120229A: Magellan observations and limit on an optical afterglow
  7. GRB 120320A: BOOTES-4 optical upper limit
  8. GRB 120320A: Swift-XRT refined Analysis
  9. GRB 120320A, Swift-BAT refined analysis
  10. GRB 120320A: Gemini-N and UKIRT observations
  11. Fermi GBM trigger 120319.237 is not a GRB
  12. GRB 120320A: Enhanced Swift-XRT position
  13. Konus-Wind observation of GRB 120316A
  14. IPN Triangulation of GRB 120316A
  15. GRB 120320A: MASTER optical observations
  16. GRB 120320A: Swift detection of a burst
  17. GBM trigger 353549464 (GRB 120316A?) : High-energy photon emission in Fermi/LAT data
  18. GRB 111228A: possible detection of the SN with the TNG
  19. Trigger 517876 is a Swift detection of GX 5-1
  20. GRB 120302A: Swift XRT refined analysis
  21. GRB 120312A: CrAO optical upper limit
  22. GRB 120312A: Gemini and UKIRT imaging
  23. Fermi GBM triggers 120309.265 and 120309.402 are not GRBs
  24. Fermi GBM triggers 120305.186, 120305.802 and 120306.823 are not GRBs
  25. GRB 120311B: Optical follow-up
  26. GRB 120312A: MASTER-NET optical observations
  27. GRB 120312A: WHT candidate afterglow
  28. GRB 120312A: NOT observations
  29. GRB 120312A: Swift-XRT refined Analysis
  30. GRB 120312A: Swift-BAT refined analysis
  31. GRB 120311A: VLT/X-shooter observations
  32. GRB 120312A: Swift detection of a burst
  33. GROND observations of GRB 120311A
  34. GRB 120311B: Swift/UVOT Upper Limits
  35. GRB 120311B: Faulkes Telescope North observations
  36. GRB 120311B: Swift-XRT refined Analysis
  37. GRB 120311A: Swift-XRT refined Analysis
  38. GRB 120311B: Enhanced Swift-XRT position
  39. GRB 120311B: Swift-BAT refined analysis
  40. GRB 120311B: Swift-XRT observations
  41. GRB 120311A, Swift-BAT refined analysis
  42. GRB 120311B: Swift detection of a burst
  43. GRB 120311A: CAHA 1.23m I-band early observations
  44. GRB 120311A: Enhanced Swift-XRT position
  45. GRB 120311A: Swift-XRT observations
  46. GRB 120311A: Liverpool Telescope optical candidate
  47. GRB 120311A: Swift detection of a burst
  48. GRB 120308A : LOAO optical observation
  49. GRB 120308A: RTT150 optical observations
  50. GRB 120302A: RTT150 optical observations
  51. GRB 120308A: 1.23m CAHA I-band observations
  52. GRB 120308A: Further PAIRITEL NIR Observations
  53. GRB 120308A: Swift/UVOT Detection
  54. GRB 120308A: Swift-XRT refined Analysis
  55. GRB 120308A: Enhanced Swift-XRT position
  56. GRB 120308A: Swift-BAT refined analysis
  57. GRB 120308A: IAC80 I-band observations
  58. GRB 120308A: PAIRITEL NIR observations
  59. GRB 120308A: confirmation of the optical afterglow
  60. GRB 120308A: Liverpool Telescope optical afterglow candidate
  61. GRB 120308A: Swift detection of a burst
  62. GRB 120305A: D50 optical limits
  63. GRB 120302A: Fermi GBM Observation
  64. GRB 120302A: Swift-BAT refined position and a possible XRT and UVOT counterpart
  65. GRB 120305A: EVLA deep limit on a radio counterpart
  66. GRB 120305A: Swift-XRT refined Analysis
  67. GRB 120305A: Enhanced Swift-XRT position
  68. GRB 120305A: Swift-BAT refined analysis
  69. GRB 120305A - Liverpool Telescope Observations
  70. GRB 120305A: MASTER-NET early optical observations
  71. GRB 120305A: Swift detection of a short burst
  72. GRB 120302A: GROND detection of an afterglow candidate
  73. GRB 120302A, Swift-BAT refined analysis
  74. GRB 111222A: Swift observation on 2012 February 06/07
  75. GRB 120302A found in ground analysis of BAT data
  76. GRB 120229A, Swift-BAT refined analysis
  77. GRB 120229A: Swift detection of a short burst
  78. Konus-Wind observation of GRB 120226A
  79. GRB 120226A: Fermi-GBM and Fermi-LAT detections; LAT position retraction
  80. GRB 120226A: Fermi-LAT data analysis
  81. IPN Triangulation of GRB 120226A
  82. GRB 120227A: RAPTOR Limit During the Gamma-Ray Emitting Interval
  83. GRB 120224A: VLT/X-shooter observations
  84. GRB 120224A: optical observation in Mondy observatory
  85. GRB 120226A: Fermi-LAT detection of a burst
  86. GRB 120224A: GROND detection of the afterglow candidate
  87. GRB 120224A: Swift-XRT refined Analysis
  88. Swift Trigger 516027 is CC Eri
  89. GRB 120224A: Swift-BAT refined analysis
  90. GRB 120224A: FTN optical observations
  91. GRB 120224A: Enhanced Swift-XRT position
  92. GRB 120224A: Swift detection of a burst
  93. GRB 1202019A: optical observation in Mondy observatory
  94. GRB 120219A: MASTER prompt and early optical limit and OT discussion
  95. GRB 120219A: 1.23m CAHA optical observations
  96. GCN 12974 : Errata in the Subject
  97. GRB 120219A, optical observations
  98. GRB120219A: Keck Observations
  99. GRB 120219A: Swift-XRT refined Analysis
  100. GRB 120219A: Swift/UVOT Upper Limits

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