Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

15242 results found.

  1. GRB141220A: 1.23m CAHA I-band observations
  2. IPN Triangulation of GRB 141207A
  3. GRB 141207A: Suzaku WAM observation of the prompt emission
  4. GRB 141202A: Suzaku WAM observation of the prompt emission
  5. GRB 141121A: Keck observations
  6. GRB 141215A: Fermi GBM detection
  7. GRB 141215A Tiled Swift observations
  8. Konus-Wind observation of GRB 141215A
  9. Konus-Wind observation of GRB 141212B
  10. GRB 141207A: Swift-XRT afterglow candidate detection
  11. Konus-Wind observation of GRB 141207A
  12. GRB141202A: Discovery Channel Telescope Optical Observations
  13. GRB141207A: Discovery Channel Telescope Optical Observations
  14. GRB 141207A: Fermi GBM detection
  15. Konus-Wind observation of GRB 141130A
  16. GRB 141207A Tiled Swift observations
  17. GRB 141207A: Fermi-LAT Detection
  18. GRB141121A: Discovery Channel Telescope Optical Observations
  19. GRB 141205A: Fermi GBM detection
  20. Konus-Wind observation of GRB 141202A
  21. GRB 141202A: Swift XRT observations
  22. GRB 141202A: Fermi GBM Detection
  23. GRB 141202A Tiled Swift observations
  24. IPN Triangulation of GRB 141202A (short/hard)
  25. GRB 141030A: Nanshan very early optical observations
  26. GRB 141121A: Continued RATIR Optical Observations
  27. GRB 141130A: Mondy optical observations
  28. GRB 141121A: RATIR Optical Observations - Errata for GCN 17105
  29. GRB 141121A: MITSuME Ishigakijima Optical Observation after 7 days
  30. IPN Triangulation of GRB 141121A (initial episode)
  31. GRB 141121A: Mondy optical observations
  32. GRB 141121A: SPI-ACS/INTEGRAL observations
  33. Konus-Wind observation of GRB 141121A
  34. GRB 141121A: three epochs of SAO RAS optical observations
  35. GRB 141121A: MITSuME Ishigakijima Optical Observation after 3 days
  36. GRB 141124A​: iPTF upper limits​
  37. GRB 141121A: RATIR Optical Observations - Fading Again
  38. GRB 141118A: Fermi GBM Detection
  39. GRB 141121A: Mondy optical observations
  40. GRB 141121A: LCO-FTN rebrightening confirmation
  41. GRB 141121A: MITSuME Ishigakijima Optical Observation
  42. GRB 141121A: MITSuME Akeno Optical observation
  43. GRB 141121A: RATIR Optical Observations
  44. GRB 141121A: GROND Afterglow candidate
  45. GRB 141121A: MAXI/GSC detection
  46. Konus-Wind observation of GRB 141118A
  47. GRB 141104A: further Swift-XRT observations and afterglow candidate
  48. GRB 141109A: TAROT La Silla observatory optical observations
  49. GRB 141109A: AAO optical observations
  50. Konus-Wind observation of GRB 141109A
  51. GRB141109A : Xinglong TNT optical observation
  52. GRB 141109A: MITSuME Ishigakijima upper limits
  53. GRB 141109A: CQUEAN Detection at 0.85 - 1.05 micron
  54. GRB 141109A: GROND afterglow observation
  55. X-shooter redshift of GRB 141109A
  56. GRB 141104A Tiled Swift observations
  57. GRB 141017A: Skynet PROMPT-CTIO/SSO Observations
  58. Konus-Wind observation of GRB 141104A
  59. Konus-Wind observation of GRB 141102A
  60. GRB 141022A: Skynet PROMPT-CTIO Observations
  61. GRB 141102A: Fermi-LAT detection
  62. GRB 141102A: Fermi GBM detection
  63. MAXI GRB 141029A is likely an X-ray flare from 1RXS J043657.1-161258
  64. GRB 141031A: Skynet PROMPT-CTIO Observations
  65. GRB 141004A: Continued Late Time RATIR Optical and NIR Observations
  66. GRB 141031A: Fermi GBM detection
  67. GRB 141031A: GROND detection of a possible optical afterglow candidate
  68. GRB 141029A: Nanshan optical upper limit
  69. GRB 140509A: GROND afterglow detection
  70. GRB 141028A: Continued RATIR Observations
  71. GRB 141029B: Fermi GBM detection
  72. GRB 141029A Tiled Swift observations
  73. GRB 141028A: VLT/X-shooter redshift of z=2.33
  74. GRB 141028A: Swift/UVOT Detection
  75. GRB 141028A: GROND Afterglow confirmation (MASTER source)
  76. GRB 141020A: Continued Mondy Observations, optical upper limit
  77. GRB 141028A Tiled Swift observations
  78. GRB 141026A: Continued RATIR Optical and NIR Observations
  79. GRB 141028A: Fermi-LAT detection
  80. GRB 141026A: Skynet PROMPT-CTIO/Yerkes-41 Observations
  81. GRB 141004A: Continued RATIR Late Time Optical and NIR Observations
  82. GRB 141026A: Continued RATIR Optical and NIR Observations, Afterglow Detection
  83. GRB141026A: Deep P200 optical imaging
  84. GRB 141026A: 1.23m CAHA I-band observations
  85. GRB 141026A: GROND observations
  86. GRB 141026A: P60 early observations
  87. GRB 141020A: AAO optical upper limit
  88. GRB 141020A: Khureltogot optical upper limit
  89. GRB141022A: Fermi GBM Detection
  90. GRB 141020A: Mondy optical observations
  91. GRB 141022A: GROND Detection of a possible Optical Afterglow Candidate
  92. GRB 141004A: RATIR Late Time Optical and NIR Observations
  93. Konus-Wind observation of GRB 141017A
  94. GRB 141017A: GROND Afterglow Confirmation
  95. Konus-Wind observation of GRB 141011A
  96. GRB 141011A: Fermi GBM detection
  97. GRB141004A: Host galaxy redshift form GTC
  98. GRB 141005A: Additional P60 imaging and afterglow confirmation
  99. GRB 141004A: Fermi GBM observation
  100. GRB 141004A: GROND 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