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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"

5859 results found.

  1. GRB 150418A: MAXI/GSC detection
  2. Swift detection of SAX J1808.4-3658
  3. Swift triggered on a source in Terzan 5 (trigger=637212)
  4. GRB 150323C: CrAO optical observations
  5. GRB 150323C: additional optical observations in Mondy
  6. GRB 150403A: Swift detection of a burst with an optical counterpart
  7. GRB 150317A: likely host galaxy detection
  8. GRB 150323C: MITSuME Akeno Optical observation
  9. GRB 150220A: Optical observations at Kyiv comet station
  10. Konus-Wind observation of GRB 150323B
  11. GRB 150323C: Mondy optical observations
  12. GRB 150323C, Swift-BAT refined analysis
  13. GRB 150323B: Fermi GBM observation
  14. GRB 150323C: MASTER-net optical observation
  15. GRB 150323B detected in ground analysis of Swift-BAT data
  16. Swift Triggers 635788-635794 are probably not real.
  17. GRB 150318A: Skynet PROMPT-CTIO Observations
  18. GRB 150220A, the review of the sky area in plate archives
  19. GRB 150314A: P60 observations
  20. GRB 150313A: MAXI/GSC detection
  21. GRB 150222A: CrAO optical observation
  22. GRB 150309A: CrAO optic upper limit
  23. GRB 150309A: ISON-Kislovodsk optic upper limit
  24. GRB150309A: Optical observations at Crni Vrh
  25. GRB 150309A: MASTER prompt optical observation
  26. GRB 150309A: Swift detection of a burst
  27. GRB 150305A: a long GRB detected by INTEGRAL
  28. GRB 150301B: GROND afterglow observations
  29. GRB 150301A: Fermi GBM observation
  30. Swift-BAT refined analysis of magnetar 4U 0142+61 (Trigger 632888)
  31. Fermi GBM Observations of Magnetar 4U 0142+61
  32. Trigger 632888: Swift detection of the magnetar 4U 0142+61
  33. GRB 150220A: Swift-XRT observations
  34. GRB 150222A: GROND optical afterglow candidate
  35. GRB 150222A: Enhanced Swift-XRT position
  36. GRB 150222A: Swift-BAT refined analysis
  37. GRB 150222A: Swift detection of a burst
  38. Trigger 631747: Swift detection of 4U 0614+09
  39. GRB 150213B: Swift-BAT refined analysis
  40. GRB 150213B: Swift detection of a burst with an optical afterglow
  41. GRB 150210A: MASTER SN detection during LAT error box inspection
  42. GRB 150206B: Fermi GBM detection
  43. Trigger 630047: Swift detection of 1RXS J180408.9-342058
  44. GRB 150206B: iPTF Optical Observations
  45. GRB 150206A: Swift detection of a burst with an optical afterglow
  46. GRB 150203A: REM optical and NIR observations
  47. GRB 150203A: Fermi GBM observation
  48. GRB 150203A: Swift detection of a burst
  49. Konus-Wind observation of GRB 150201A
  50. GRB 150201A: Fermi GBM observation
  51. GRB 150201A: Swift detection of a burst
  52. GRB 150128A: MASTER OT detction during inspection
  53. IPN Triangulation of GRB 150127A
  54. GRB 150127A: Fermi-LAT detection
  55. GRB150127A: Fermi GBM Detection
  56. GRB 150123A: MAXI/GSC detection
  57. Konus-Wind observation of GRB 150118B
  58. IPN Triangulation of GRB 150118B (long/intense)
  59. GRB 150118B: Fermi GBM Detection
  60. GRB 150118B: Fermi-LAT detection
  61. The Swift Detection of a Large Flare from the RS CVn Binary SZ Psc
  62. Swift detection of the variable star SZ Psc
  63. GRB 150110B: Swift detection of a burst
  64. Swift detection of 4U 1700+24 (= V* V934 Her)
  65. GRB 141225A: MASTER-SAAO first OT detection
  66. GRB 141225A: UVOT detection
  67. GRB 141225A: Optical aftergow confirmation
  68. GRB 141225A: LT optical candidate
  69. GRB 141225A: 1.23m CAHA optical observations
  70. GRB 141222A: First MASTER-SAAO optical observation
  71. GRB 141222A: Fermi-LAT detection
  72. GRB141221A: GROND Afterglow Detection
  73. GRB 141212A: Swift-BAT refined analysis
  74. Swift detection of 4U 1700+24 (= V934 Her)
  75. GRB 141212A: extended object within the XRT error circle
  76. GRB 141212A: Swift detection of a short burst
  77. GRB 141202A: Swift/UVOT Detection of a Variable Source Near the IPN Error Box
  78. GRB 141121A: Mondy optical observations
  79. IPN Triangulation of GRB 141202A (short/hard)
  80. GRB 141124A​: iPTF upper limits​
  81. GRB 141121A: Swift detection of a burst
  82. Swift Trigger 618673: probable noise event
  83. Trigger 618634: Swift detection of Vela X-1
  84. GRB 141109B: optical upper limits
  85. Swift Trigger 618402: probable noise event
  86. GRB 141109B: MITSuME Akeno upper limits
  87. GRB141109A : Xinglong TNT optical observation
  88. GRB 141109A: MITSuME Ishigakijima upper limits
  89. GRB 141109A: CQUEAN Detection at 0.85 - 1.05 micron
  90. GRB 141109A: GROND afterglow observation
  91. X-shooter redshift of GRB 141109A
  92. GRB 141109A: REM NIR candidate afterglow
  93. GRB 141031A, Swift-BAT refined analysis
  94. GRB 141028A: SAO RAS Zeiss-1000 photometry
  95. GRB 140509A: GROND afterglow detection
  96. GRB 141029A: MAXI/GSC detection
  97. GRB 141026A: SAO RAS Zeiss-1000 observations
  98. GRB 141020A: Khureltogot optical upper limit
  99. GRB 141022A: Swift-BAT refined analysis
  100. GRB141015A iTelescope observation

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