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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"

28294 results found.

  1. GRB 160623A: TSHAO optical observations
  2. GRB 160624A: Swift-XRT refined Analysis
  3. GRB 160623A: MITSuME Ishigakijima Optical Observation
  4. GRB 160624A: MITSuME Ishigakijima upper limits
  5. GRB 160624A, Swift-BAT refined analysis
  6. GRB 160623A: Swift/UVOT Upper Limits
  7. GRB 160623A: RATIR Optical and NIR Observations, Afterglow Confirmation
  8. GRB 160624A: Enhanced Swift-XRT position
  9. GRB160624A:possible GRB host redshift
  10. GRB 160623A: Mondy optical observations
  11. GRB 160624A: Swift detection of a short burst
  12. GRB 160623A: Swift-XRT afterglow detection
  13. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  14. Trigger 701182: Swift detection of SGR 1935+2154
  15. GRB 160623A / Galactic transient: Fermi-LAT detection
  16. SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
  17. BAT trigger 700791 (possible GRB 160622A) is SNR RCW 103
  18. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  19. LIGO/Virgo G211117/GW151226: serendipitous XMM-Newton slew observations
  20. GRB 160612A: Swift-XRT observations
  21. IPN Triangulation of GRB 160612A (short/hard)
  22. GRB 160612A: Fermi GBM detection
  23. GRB 160611A: Swift/UVOT observations
  24. GRB 160611A: Swift-BAT refined analysis
  25. Swift Trigger 690738 is not an astrophysical event
  26. GRB 160611A: Swift-XRT refined Analysis
  27. GRB160611.9 MASTER-Net OT detection
  28. GRB 160611A: Enhanced Swift-XRT position
  29. GRB 160611A: Swift-XRT observations
  30. SWIFT J174540.2-290037, Swift-BAT refined analysis (trigger 690197)
  31. SWIFT J174540.2-290037, Swift-BAT refined analysis (trigger 689956)
  32. Trigger 689956: Swift detection of a source near the Galactic center
  33. GRB 160607A: Swift/UVOT Upper Limits
  34. GRB 160607A: GROND confirmation of the afterglow
  35. GRB 160607A: candidate optical afterglow from the NOT
  36. GRB 160607A: Swift-BAT refined analysis
  37. Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
  38. GRB 160607A: Swift-XRT refined Analysis
  39. GRB 160607A: Enhanced Swift-XRT position
  40. GRB 160607A: Swift detection of a bright burst
  41. Trigger 689353: Swift detection of a transient near Sgr A*
  42. GRB 160601A: AbAO optical observations
  43. GRB 160601A: Swift/UVOT Upper Limits
  44. GRB 160601A: Swift-BAT refined analysis
  45. GRB160601A: Gemini Imaging
  46. GRB 160601A: GTC observations confirming transient source decay
  47. GRB 160601A: Mondy optical observations, photometry of NOT sources
  48. GRB160601A: NOT afterglow confirmation
  49. GRB 160601A: Swift-XRT refined Analysis
  50. GRB160601A: NOT detection of an afterglow candidate
  51. GRB 160601A: Enhanced Swift-XRT position
  52. GRB 160601A: Mondy optical observations
  53. GRB 160601A: MITSuME Okayama Ks-band upper-limit
  54. GRB 160530A: Swift follow-up and X-ray afterglow candidate
  55. GRB 160601A: MITSuME Okayama upper limits
  56. GRB 160601A: Swift detection of a short hard burst
  57. GRB 160530B: Fermi GBM Detection
  58. GRB 160530A: discovery with the Compton Spectrometer and Imager
  59. GRB 160525B: Mondy optical upper limit
  60. GRB 160525B: Khureltogot optical upper limit
  61. GRB 160525B: Swift-BAT refined analysis
  62. GRB 160525B: Swift-XRT refined Analysis
  63. GRB 160525B: Nanshan optical upper limit
  64. GRB 160525B: Swift/UVOT Detection
  65. GRB 160521B: Swift-XRT afterglow detection
  66. GRB 160525B: Enhanced Swift-XRT position
  67. GRB 160525A: Swift-BAT refined analysis
  68. GRB 160525B: Swift detection of a burst
  69. GRB 160525A: Swift detection of a probable burst
  70. GRB 160521B: Theoretical estimate of the redshift and urgent need for further x-ray observations
  71. GRB 160521B: Swift-XRT observations
  72. Another Swift detection of SGR 1935+2154 (trigger #687124)
  73. Swift detection of SGR 1935+2154
  74. GRB 160521B: Fermi GBM detection
  75. GRB 160521A: a long GRB detected by INTEGRAL
  76. GRB 160519A: Swift-BAT refined analysis
  77. GRB 160519A: Fermi GBM detection
  78. SGR 1935+2154: AbAO optical upper limit
  79. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  80. Trigger 686443: Swift detection of SGR 1935+2154
  81. FACT follow-up of the IceCube event 160427A
  82. Interplanetary Network Search for IceCube 160427A
  83. GRB 160509A: CALET Gamma-Ray Burst Monitor detection
  84. GRB 160509A: non-observation of VHE emission with HAWC
  85. GRB 160509A: TLS Tautenburg Afterglow Detection
  86. GRB 160509A Gemini North redshift
  87. GRB 160509A: Fermi-LAT refined analysis
  88. GRB 160509A: Fermi GBM Detection
  89. GRB 160509A Gemini North candidate afterglow
  90. GRB 160509A: optical observations
  91. GRB 160509A: Swift-XRT afterglow detection
  92. Correction to GCN 19404; GRB 160509A: MAXI/GSC detection
  93. GRB 160227A: MAXI/GSC detection
  94. GRB 160506A: TAROT La Silla observatory optical observations
  95. LIGO/Virgo G211117: Astrosat CZTI upper limits
  96. GRB 160506A: IRSF upper limits
  97. GRB 160506A: Swift-XRT refined Analysis
  98. GRB 160506A: Swift/UVOT Upper Limits
  99. GRB 160506A: Swift-BAT refined analysis
  100. GRB 160506A: GROND upper limits

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