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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"

3765 results found.

  1. GRB 170202A: MITSuME Akeno Optical Observation
  2. GRB 170202A: MASTGlobal ER-Net bright OT nonmonotonic light curve
  3. GRB 170202A: Mini-MegaTORTORA upper limits
  4. GRB 170202A: Swift detection of a burst with an optical afterglow
  5. LIGO/Virgo G270580: Las Cumbres Observatory Follow-up Observations
  6. GRB 170127A: GROND Upper limits
  7. Konus-Wind observation of GRB 170126A
  8. GRB 170127B: Swift detection of a short burst
  9. LIGO/Virgo G270580: Pan-STARRS coverage and 124 optical transients
  10. GRB 170121B: MASTER early optical observations of the Swift possible XT
  11. LIGO/Virgo G270580: ATLAS coverage and 4 optical transients
  12. LIGO/Virgo G270580: Mini-MegaTORTORA follow-up observations
  13. GRB 170113A: Swift detection of a burst with an optical counterpart
  14. GRB 170111A: Swift detection of a burst
  15. Trigger 731535: Swift detection of GRS 1716-249/GRO J1719-24/V2293 Oph
  16. LIGO/Virgo G268556: Pan-STARRS1 observations and summary of transient sources
  17. Trigger 731257: Another Swift-BAT detection of GRS 1716-249/GRO J1719-24/V2293 Oph
  18. Trigger 731183: Swift detection of GRS 1716-249/GRO J1719-24/V2293 Oph
  19. LIGO/Virgo G211117 / GW151226: LOFAR follow-up
  20. LIGO/Virgo G268556: observation regions by Project Mini-GWAC of SVOM
  21. GRS 1716-249/GRO J1719-24/V2293 Oph, Swift-BAT refined analysis
  22. GRB 161220A: Swift-BAT refined analysis
  23. IPN Triangulation of GRB 161218B (long/very bright)
  24. GRB 161117A: Swift/UVOT Detection
  25. GRB 161117B: LCO optical observations
  26. GRB 161117A: VLT/X-shooter spectroscopy and redshift
  27. GRB 161117A: Swift detection of a burst with an optical counterpart
  28. GRB 161108A: TSHAO optical observations
  29. GRB 161108A: TAROT Calern observatory optical observations
  30. GRB 160928A: The first GRB detected by POLAR
  31. Konus-Wind observation of GRB 161023A
  32. Konus-Wind observation of GRB 161017A
  33. GRB 161017A: MITSuME Akeno Optical Observation
  34. GRB 161014A: Swift-XRT refined Analysis
  35. GRB 161014A: Swift-BAT refined analysis
  36. GRB 161014A: Swift/UVOT Detection
  37. GRB 161014A: Swift-XRT and UVOT afterglow detection
  38. GRB 161014A : Xinglong TNT optical observation
  39. GRB161014A: optical afterglow candidate with the LCOGT-FTS
  40. GRB 161014A: MITSuME-Akeno optical observation
  41. GRB 161010A: Swift/UVOT Possible Detection
  42. GRB 161007A: MASTER-net early optical observations
  43. GRB 160927A: GTC observations
  44. GRB 161004B: Prompt enhanced Swift-XRT position
  45. GRB 161004A: Swift detection of a burst with a possible optical counterpart
  46. Fermi GBM trigger 496791348/160928900 is not a GRB
  47. GRB160925A / Fermi 496473540: MASTER optical transient confirmation by LCOGT-FTN
  48. GRB160821A: Astrosat CZTI (veto) detection
  49. IPN Triangulation of GRB 160820A (short/hard)
  50. GRB 160816A: TSHAO optical observations
  51. IPN Triangulation of GRB 160806A
  52. GRB 160804A: Swift-BAT refined analysis
  53. GRB 160801A: Swift detection of a burst
  54. HAWC follow up of IceCube 160731
  55. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  56. Konus-Wind observation of GRB 160720A
  57. GRB 160712A: Global MASTER-Net optical observation
  58. GRB 160628A CALET Gamma-Ray Burst Monitor detection
  59. GRB 160629A: AbAO optical observations
  60. GRB 160703A: Swift-BAT refined analysis
  61. GRB 160629A: AbAO optical observations
  62. GRB 160625B: TSHAO optical observations, correction GCN 19619
  63. IPN Triangulation of GRB 160620A (short/hard)
  64. GRB 160624A: Swift-XRT refined Analysis
  65. GRB 160624A: Swift detection of a short burst
  66. LIGO/Virgo G211117/GW151226: serendipitous XMM-Newton slew observations
  67. IPN Triangulation of GRB 160612A (short/hard)
  68. GRB160611.9 MASTER-Net OT detection
  69. GRB 160601A: AbAO optical observations
  70. FERMI GBM bursts from the magnetar SGR 1935+2154
  71. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  72. FACT follow-up of the IceCube event 160427A
  73. GRB 160501A: Swift-BAT refined analysis
  74. MASTER search for counterpart to the IceCube event 67093193 (run 127853)
  75. GRB 160425A MASTER notices: possible host galaxy in the optical error-box
  76. GRB 160425A : MASTER earlier optical observations
  77. LIGO/Virgo G211117: EWE for NOWT of 12 days follow-up of northern sky
  78. GRB 160411A: Fermi GBM detection
  79. GRB 160411A: Swift detection of a short burst
  80. GRB 160410A: Swift/UVOT Detection
  81. GRB 160410A: Enhanced Swift-XRT position
  82. GRB 160410A: GROND optical detection
  83. GRB 160410A: Swift detection of a (possibly-short) burst with an optical counterpart
  84. GRB 160327A: Continued RATIR Optical and NIR Observations
  85. LIGO/Virgo G211117: LOFAR follow-up
  86. GRB 160327A: Swift-BAT refined analysis
  87. Swift detects GX 301-2 in very high state
  88. GRB 160321A: MASTER observations zero Galaxy latitude GRB
  89. Swift Trigger 678197 is a noise fluctuation
  90. LIGO/Virgo G211117: GRAWITA LBT follow-up of PS15dpn
  91. GRB 160303A: BOAO R-band Detection
  92. GRB 160227A: LOAO 1.0m optical detection
  93. GRB 160227A: McDonald 0.8m Detection
  94. GRB 160228A: Mondy optcial observations
  95. GRB 160228A: MASTER-Amur prompt observations
  96. GRB 160227A: AROMA-N Optical Observation
  97. GRB 160228A: optical observations
  98. GRB 160225.81/FERMI Trigg 478121069: MASTER OT J095503.19-355149.4 detection
  99. GRB 160221A: Swift-XRT afterglow detection
  100. GRB 160221A: Swift-XRT observations

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