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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"

5401 results found.

  1. GRB 161015A: Fermi-LAT detection
  2. GRB 161014A: TNG optical observations
  3. GRB 161014A: Continued MITSuME Akeno Optical Observation
  4. GRB 161014A : Xinglong TNT optical observation
  5. GRB 160925A: Kottamia R-band observation
  6. GRB 161001A: GROND afterglow candidate
  7. GRB 160814A: MAXI/GSC detection
  8. Swift Trigger 707545 is likely 4U 1850-03/GS1843-02
  9. GRB 160804A: ISON/UAFO optical observations
  10. Swift follow up of IceCube-160731A
  11. Swift Trigger 704327: MASTER syncronous optical observations
  12. Swift Trigger 704327: a possible GRB
  13. GRB 160712A: GROND observations
  14. GRB 160629A: AbAO optical observations
  15. GRB 160703A: MITSuME Ishigakijima Optical Observation
  16. GRB 160703A: MITSuME Akeno Optical Observations
  17. GRB 160625B: RTT150 optical observations
  18. GRB 160625B: MITSuME Ishigakijima Optical Observation
  19. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  20. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  21. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  22. LIGO/Virgo G211117/GW151226: serendipitous XMM-Newton slew observations
  23. SWIFT J174540.2-290037, Swift-BAT refined analysis (trigger 689956)
  24. Trigger 689956: Swift detection of a source near the Galactic center
  25. Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
  26. Konus-Wind observation of GRB 160530A
  27. IPN Triangulation of GRB 160530A
  28. GRB 160525B: MITSuME Akeno optical upper limits
  29. GRB 160530A: discovery with the Compton Spectrometer and Imager
  30. The nature of the Fermi/GBM trigger 160523919 is unknown.
  31. Swift detection of SGR 1935+2154
  32. GRB 160521A: a long GRB detected by INTEGRAL
  33. GRB 160509A: MAXI/GSC refined analysis
  34. LIGO/Virgo G211117: Astrosat CZTI upper limits
  35. GRB 160506A: Swift detection of a burst
  36. ICECUBE-160427A : Pan-STARRS imaging and optical transients in the field
  37. GRB 160503A: Fermi GBM observation
  38. GRB 160503A: Fermi-LAT detection
  39. GRB 160325A: Skynet PROMPT-CTIO observations of the optical afterglow
  40. GRB 160417A: GMG observations
  41. LIGO/Virgo G211117: EWE for NOWT of 12 days follow-up of northern sky
  42. GRB 160409A found in Swift BAT ground analysis
  43. GRB 160410A: Swift/UVOT Detection
  44. GRB 160410A: Swift detection of a (possibly-short) burst with an optical counterpart
  45. LIGO/Virgo G211117: LOFAR follow-up
  46. GRB 160327A: JCMT SCUBA-2 sub-mm observation
  47. GRB 160327A: Continued RATIR Optical and NIR Observations
  48. GRB 160327A: Mondy optical upper limit
  49. GRB 160327A: RATIR Optical and NIR Afterglow Detection
  50. GRB 160325A: GROND Upper Limits
  51. GRB 160325A: Swift detection of a burst
  52. Swift detects GX 301-2 in very high state
  53. GRB 160321A: AbAO optical observations
  54. GRB 160321A: Possible RATIR Optical and NIR Detections
  55. GRB 160321A: MASTER observations zero Galaxy latitude GRB
  56. GRB 160310A: Terskol 2-m observations
  57. GRB 160310A: A further Swift-XRT observation, no afterglow detected
  58. GRB 160314A: Continued RATIR Optical and NIR Observations
  59. GRB 160313A: Mondy optical upper limit
  60. GRB 160314A: GROND optical/NIR observations
  61. GRB 160314A: ISON-Ussuriysk optical upper limit, updated photometry and correction of GCN 19184
  62. GRB 160314A: RATIR Optical and NIR Observations
  63. GRB 160314A: Mondy optical observations
  64. GRB 160228A: GROND afterglow confirmation and X-shooter host candidate redshift
  65. GRB 160314A: ISON-Ussuriysk optical upper limit
  66. GRB 160314A: Weihai optical upper limit
  67. GRB 160314A: Swift detection of a burst
  68. GRB 160313A: MASTER-Net optical observations
  69. GRB 160313A: RATIR Optical and NIR Observations
  70. GRB 160310A: MASTER-Kislovods observations
  71. GRB 160310A: Further NOT observations
  72. GRB 160310A: RATIR Optical and NIR Observations
  73. GRB 160310A: NOT optical observations
  74. GRB 160310A: LCOGT-SAAO optical upper limits
  75. LIGO/Virgo G211117: HAWC follow-up of northern sky
  76. GRB 160303A: X-shooter spectroscopy
  77. GRB 160303A: JCMT SCUBA-2 sub-mm observation
  78. GRB160303A: further GROND observations
  79. GRB 160303A: Continued RATIR Optical and NIR Observations
  80. GRB 160303A: GROND Optical Detection
  81. GRB 160303A: VLT/FORS2 afterglow obervations
  82. GRB 160303A: McDonald 2.1m CQUEAN Detection
  83. GRB 160303A: RATIR Optical and NIR Afterglow Detection
  84. GRB 160303A: MITSuME Akeno optical upper limits
  85. GRB 160303A: LCOGT-FTN optical observations
  86. GRB 160303A: MITSuME Okayama upper limits
  87. GRB 160303A: ISON-NM early optical early limits
  88. GRB 160227A: McDonald 0.8m Detection
  89. GRB 160227A: MASTER prompt OT Detection and LC
  90. GRB 160227A: MASTER OT Detection
  91. Fermi GBM trigger 477460274/160218161 is not a GRB
  92. GRB 160223A: GROND optical/NIR afterglow
  93. LIGO/Virgo G211117: LOFAR follow-up
  94. GRB 160203A: MITSuME Akeno optical upper limits
  95. GRB 160203A: TSHAO optical observations
  96. GRB 160203A: Skynet PROMPT-CTIO observations of the optical afterglow
  97. The bright GRB160203A: X-shooter spectroscopy and redshift
  98. GRB 160203A: LCOGT-Cerro Tololo optical afterglow confirmation
  99. GRB 160203A: GROND Afterglow Candidate
  100. GRB 160131A: RATIR Optical Observations

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