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"

37715 results found.

  1. GRB 120326A: T17 optical observations
  2. GRB 120326A: GTC redshift
  3. GRB 120326A: CQUEAN grizY Observation
  4. GRB 120323A: MASTER follow up observations
  5. GRB 120326A: Swift-XRT refined Analysis
  6. GRB 120326A: Swift/UVOT Detection
  7. GRB 120326A: Optical observations at Crni Vrh
  8. GRB120326A: IAC80 observations
  9. GRB 120326A: Liverpool Telescope observations
  10. GRB 120326A: Enhanced Swift-XRT position
  11. Skynet/Dolomiti Observations of GRB120326A
  12. GRB 120326A: TAROT Calern observatory afterglow optical decay
  13. GRB 120326A: TAROT Calern observatory afterglow optical detection
  14. GRB 120326A: ROTSE-III Optical Limits
  15. GRB 120326A: Swift detection of a burst
  16. GRB 120323A: Fermi LAT observations
  17. Konus-Wind observation of GRB 120323A
  18. IPN Triangulation of GRB 120323A (short/very intense)
  19. GRB 120324A: Swift-XRT refined Analysis
  20. Konus-Wind observation of GRB 120324A
  21. GRB 120323A: Fermi GBM detection
  22. GRB 120324A: GROND observations
  23. GRB 120324A: CQUEAN rizY Observation
  24. GRB 120324A: Swift-BAT refined analysis
  25. GRB 120324A: Swift/UVOT Upper Limits
  26. GRB 120324A: TAROT La Silla observatory optical observations
  27. GRB 120324A: Enhanced Swift-XRT position
  28. GRB 120324A: Liverpool Telescope optical candidate
  29. GRB 120324A: UVOT Finding Chart Observation
  30. GRB 120324A: Swift detection of a burst
  31. GRB 120316A : Suzaku WAM observation of the prompt emission
  32. GRB 120320A: Zadko optical observations
  33. GRB 120320A, the review of the sky area in plate archives
  34. GRB 120316A: Fermi-GBM and Fermi-LAT Observations
  35. GRB 120229A: Magellan observations and limit on an optical afterglow
  36. GRB 120320A: Swift/UVOT Upper Limits
  37. GRB 120320A: MITSuME Okayama Optical upper limits
  38. GRB 120320A , optical observations
  39. GRB 120320A: BOOTES-4 optical upper limit
  40. GRB 120320A: Swift-XRT refined Analysis
  41. GRB 120320A, Swift-BAT refined analysis
  42. GRB 120320A: Gemini-N and UKIRT observations
  43. Fermi GBM trigger 120319.237 is not a GRB
  44. GRB 120320A: Enhanced Swift-XRT position
  45. Konus-Wind observation of GRB 120316A
  46. IPN Triangulation of GRB 120316A
  47. GRB 120320A: MASTER optical observations
  48. GRB 120320A: Swift detection of a burst
  49. GBM trigger 353549464 (GRB 120316A?) : High-energy photon emission in Fermi/LAT data
  50. GRB 111228A: possible detection of the SN with the TNG
  51. GRB 120302A: Swift XRT refined analysis
  52. GRB 120312A, the review of the sky area in plate archives
  53. GRB 120312A: CrAO optical upper limit
  54. GRB 120312A: Gemini and UKIRT imaging
  55. GRB 120311A, the review of the sky area in plate archives
  56. Fermi GBM triggers 120309.265 and 120309.402 are not GRBs
  57. Fermi GBM triggers 120305.186, 120305.802 and 120306.823 are not GRBs
  58. GRB 120311A: Optical follow-up
  59. GRB 120311B: Optical follow-up
  60. GRB 120311A: C88 optical limits
  61. GRB 120312A: Swift/UVOT Upper Limits
  62. GRB 120312A: MASTER-NET optical observations
  63. GRB 120312A: WHT candidate afterglow
  64. GRB 120312A: NOT observations
  65. GRB 120312A: Swift-XRT refined Analysis
  66. GRB 120312A: Swift-BAT refined analysis
  67. GRB 120311A: VLT/X-shooter observations
  68. GRB 120311B: C88 optical limits
  69. GRB 120312A: Swift detection of a burst
  70. GROND observations of GRB 120311A
  71. GRB 120311B: Swift/UVOT Upper Limits
  72. GRB 120311B: MITSuME Okayama Optical upper limits
  73. GRB 120311B: Faulkes Telescope North observations
  74. GRB 120311B: Swift-XRT refined Analysis
  75. GRB 120311A: Swift-XRT refined Analysis
  76. GRB 120311B: Enhanced Swift-XRT position
  77. GRB 120311B: Swift-BAT refined analysis
  78. GRB 120311B: Swift-XRT observations
  79. GRB 120311A, Swift-BAT refined analysis
  80. GRB 120311B: Swift detection of a burst
  81. GRB 120311A: Swift/UVOT Upper Limits
  82. GRB 120311A: CAHA 1.23m I-band early observations
  83. GRB 120311A: Enhanced Swift-XRT position
  84. GRB 120311A: Swift-XRT observations
  85. GRB 120311A: Liverpool Telescope optical candidate
  86. GRB 120311A: Swift detection of a burst
  87. GRB 120308A : LOAO optical observation
  88. GRB 120308A: RTT150 optical observations
  89. GRB 120302A: RTT150 optical observations
  90. GRB 120308A: 1.23m CAHA I-band observations
  91. GRB 120308A: Further PAIRITEL NIR Observations
  92. GRB120308A: MITSuME Ishigakijima Optical Upper Limits
  93. GRB 120308A: Swift/UVOT Detection
  94. GRB 120308A: Swift-XRT refined Analysis
  95. GRB 120308A: Enhanced Swift-XRT position
  96. GRB 120308A: Swift-BAT refined analysis
  97. GRB 120308A: IAC80 I-band observations
  98. GRB 120308A: PAIRITEL NIR observations
  99. GRB 120308A: confirmation of the optical afterglow
  100. GRB 120308A: Liverpool Telescope optical afterglow candidate

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