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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"

15251 results found.

  1. GRB 141222A: Fermi-LAT detection
  2. GRB 141215A: further Swift-XRT observations and afterglow detection
  3. GRB 141221A: Fermi GBM observation
  4. GRB141221A: GROND Afterglow Detection
  5. Konus-Wind observation of GRB 141220A
  6. GRB 141220A: Fermi GBM observation
  7. GRB 141220A: MITSuME Okayama upper limits
  8. GRB 141220A: Photometry from OSIRIS/GTC
  9. GRB 141220A: LT optical afterglow observations
  10. GRB141220A: 1.23m CAHA I-band observations
  11. IPN Triangulation of GRB 141207A
  12. GRB 141207A: Suzaku WAM observation of the prompt emission
  13. GRB 141202A: Suzaku WAM observation of the prompt emission
  14. GRB 141121A: Keck observations
  15. GRB 141215A: Fermi GBM detection
  16. GRB 141215A Tiled Swift observations
  17. Konus-Wind observation of GRB 141215A
  18. Konus-Wind observation of GRB 141212B
  19. GRB 141207A: Swift-XRT afterglow candidate detection
  20. Konus-Wind observation of GRB 141207A
  21. GRB141202A: Discovery Channel Telescope Optical Observations
  22. GRB141207A: Discovery Channel Telescope Optical Observations
  23. GRB 141207A: Fermi GBM detection
  24. Konus-Wind observation of GRB 141130A
  25. GRB 141207A Tiled Swift observations
  26. GRB 141207A: Fermi-LAT Detection
  27. GRB141121A: Discovery Channel Telescope Optical Observations
  28. GRB 141205A: Fermi GBM detection
  29. Konus-Wind observation of GRB 141202A
  30. GRB 141202A: Swift XRT observations
  31. GRB 141202A: Fermi GBM Detection
  32. GRB 141202A Tiled Swift observations
  33. IPN Triangulation of GRB 141202A (short/hard)
  34. GRB 141030A: Nanshan very early optical observations
  35. GRB 141121A: Continued RATIR Optical Observations
  36. GRB 141130A: Mondy optical observations
  37. GRB 141121A: RATIR Optical Observations - Errata for GCN 17105
  38. GRB 141121A: MITSuME Ishigakijima Optical Observation after 7 days
  39. IPN Triangulation of GRB 141121A (initial episode)
  40. GRB 141121A: Mondy optical observations
  41. GRB 141121A: SPI-ACS/INTEGRAL observations
  42. Konus-Wind observation of GRB 141121A
  43. GRB 141121A: three epochs of SAO RAS optical observations
  44. GRB 141121A: MITSuME Ishigakijima Optical Observation after 3 days
  45. GRB 141124A​: iPTF upper limits​
  46. GRB 141121A: RATIR Optical Observations - Fading Again
  47. GRB 141118A: Fermi GBM Detection
  48. GRB 141121A: Mondy optical observations
  49. GRB 141121A: LCO-FTN rebrightening confirmation
  50. GRB 141121A: MITSuME Ishigakijima Optical Observation
  51. GRB 141121A: MITSuME Akeno Optical observation
  52. GRB 141121A: RATIR Optical Observations
  53. GRB 141121A: GROND Afterglow candidate
  54. GRB 141121A: MAXI/GSC detection
  55. Konus-Wind observation of GRB 141118A
  56. GRB 141104A: further Swift-XRT observations and afterglow candidate
  57. GRB 141109A: TAROT La Silla observatory optical observations
  58. GRB 141109A: AAO optical observations
  59. Konus-Wind observation of GRB 141109A
  60. GRB141109A : Xinglong TNT optical observation
  61. GRB 141109A: MITSuME Ishigakijima upper limits
  62. GRB 141109A: CQUEAN Detection at 0.85 - 1.05 micron
  63. GRB 141109A: GROND afterglow observation
  64. X-shooter redshift of GRB 141109A
  65. GRB 141104A Tiled Swift observations
  66. GRB 141017A: Skynet PROMPT-CTIO/SSO Observations
  67. Konus-Wind observation of GRB 141104A
  68. Konus-Wind observation of GRB 141102A
  69. GRB 141022A: Skynet PROMPT-CTIO Observations
  70. GRB 141102A: Fermi-LAT detection
  71. GRB 141102A: Fermi GBM detection
  72. MAXI GRB 141029A is likely an X-ray flare from 1RXS J043657.1-161258
  73. GRB 141031A: Skynet PROMPT-CTIO Observations
  74. GRB 141004A: Continued Late Time RATIR Optical and NIR Observations
  75. GRB 141031A: Fermi GBM detection
  76. GRB 141031A: GROND detection of a possible optical afterglow candidate
  77. GRB 141029A: Nanshan optical upper limit
  78. GRB 140509A: GROND afterglow detection
  79. GRB 141028A: Continued RATIR Observations
  80. GRB 141029B: Fermi GBM detection
  81. GRB 141029A Tiled Swift observations
  82. GRB 141028A: VLT/X-shooter redshift of z=2.33
  83. GRB 141028A: Swift/UVOT Detection
  84. GRB 141028A: GROND Afterglow confirmation (MASTER source)
  85. GRB 141020A: Continued Mondy Observations, optical upper limit
  86. GRB 141028A Tiled Swift observations
  87. GRB 141026A: Continued RATIR Optical and NIR Observations
  88. GRB 141028A: Fermi-LAT detection
  89. GRB 141026A: Skynet PROMPT-CTIO/Yerkes-41 Observations
  90. GRB 141004A: Continued RATIR Late Time Optical and NIR Observations
  91. GRB 141026A: Continued RATIR Optical and NIR Observations, Afterglow Detection
  92. GRB141026A: Deep P200 optical imaging
  93. GRB 141026A: 1.23m CAHA I-band observations
  94. GRB 141026A: GROND observations
  95. GRB 141026A: P60 early observations
  96. GRB 141020A: AAO optical upper limit
  97. GRB 141020A: Khureltogot optical upper limit
  98. GRB141022A: Fermi GBM Detection
  99. GRB 141020A: Mondy optical observations
  100. GRB 141022A: GROND Detection of a possible Optical Afterglow Candidate

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