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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"

865 results found.

  1. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
  2. GRB 180809A: further Swift/XRT observations
  3. GRB 180701A/MAXI J2119-045: CALET Gamma-Ray Burst Monitor data search
  4. GRB 180728A: VLT/X-shooter redshift of a nearby energetic GRB
  5. Fermi GBM triggers 552488966/180705548 and 552490104/180705561 are not GRBs
  6. GRB 180701A: MAXI/GSC detection
  7. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  8. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  9. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  10. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  11. LIGO/Virgo G298048: Chandra X-ray Update on GW170817
  12. LIGO/Virgo G298048: Discovery of X-ray emission from SSS17a in NGC4993
  13. LIGO/Virgo G298936: Astrosat CZTI upper limits
  14. LIGO/Virgo G298048: INTEGRAL pointed follow-up observations
  15. LIGO/Virgo G298048: Chandra X-ray observations
  16. GRB170730A detecetd by INTEGRAL. Refined analysis
  17. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  18. GRB 170524A: Swift detection of a burst (or possible new SGR)
  19. LIGO/Virgo G275697: DLT40 follow-up observation
  20. LIGO/Virgo G268556/GW170104: Lomonosov BDRG observations
  21. GRB 160821B: Swift-BAT refined analysis
  22. GBM observation of SGR-like burst from the direction of PSR 1119-6127
  23. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  24. GRB 160703, GRB 160705, GRB 160720, SGR1935+2154: First SGRs and GRBs detected by Lomonosov.
  25. SGR 1935+2154: CALET Gamma-Ray Burst Monitor detections
  26. Konus-Wind observation of a bright burst from SGR 1935+2154
  27. SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
  28. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  29. Swift-BAT refined analysis on the bright event from SGR 1935+2154
  30. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  31. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  32. Trigger 701182: Swift detection of SGR 1935+2154
  33. SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
  34. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  35. Fermi GBM Trigger 160622573 is not a GRB
  36. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  37. More FERMI GBM bursts from the magnetar SGR 1935+2154
  38. SGR 1935+2154: MAXI/GSC detection
  39. Fermi GBM trigger 488128598/160620637 is not a GRB
  40. Fermi GBM trigger 487974449/160618852 is not a GRB
  41. Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
  42. Trigger 689353: Swift detection of a transient near Sgr A*
  43. Fermi GBM trigger 486562774/160602514 is not a GRB
  44. Another Swift detection of SGR 1935+2154 (trigger #687124)
  45. Swift detection of SGR 1935+2154
  46. Konus-Wind observation of a bright burst from SGR 1935+2154
  47. FERMI GBM bursts from the magnetar SGR 1935+2154
  48. SGR 1935+2154: AbAO optical upper limit
  49. Fermi GBM triggers of SGR 1935+2154
  50. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  51. Fermi GBM trigger 485124591/160516868 is not a GRB
  52. Trigger 686443: Swift detection of SGR 1935+2154
  53. Fermi GBM trigger 484906918/160514349 is not a GRB
  54. GRB 160401A: a long GRB detected by INTEGRAL
  55. SGR 0755-2933, Swift-BAT refined analysis
  56. Swift detection of a likely new SGR: SGR 0755-2933
  57. IBAS Alert 7313 is SGR J1935+2154
  58. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  59. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  60. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  61. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  62. GRB 150912A: A long GRB detected by INTEGRAL
  63. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  64. Fermi GBM triggers bn150715759 and bn150715817 are not due to GRBs
  65. Trigger 649113: Swift detection of SGR 1E 1841-045
  66. Swift-XRT observations of GRB 150710A
  67. Swift trigger 642453 is not an astrophysical source
  68. Konus-Wind observation of a bright burst from SGR 1935+2154
  69. IPN Triangulation of a bright burst from SGR 1935+2154
  70. GRB 150301A: Swift-BAT refined analysis
  71. GRB 150301A: Fermi GBM observation
  72. GRB 150301A: Swift detection of a short burst or new SGR
  73. Fermi GBM Observations of SGR 1935+2154
  74. Fermi GBM trigger 150223068 is not a GRB
  75. SGR 1935+2154: Swift-BAT refined analysis
  76. Swift detection of an outburst from SGR 1935+2154
  77. Trigger 607399: Swift detection of SGR1806-20
  78. Fermi GBM Observations of SGR 1935+2154
  79. GRB 140710B: a long GRB detected with INTEGRAL
  80. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  81. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  82. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  83. SGR 1935+2154: Swift-BAT observations of additional short soft events
  84. GRB 140705A / SGR 1935+2154: FTN observations
  85. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  86. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  87. Swift detection of a bright X-ray source in M31
  88. Fermi GBM Trigger 140429551 - Detection of a burst from SGR 1806-20
  89. Trigger 597570: Swift detection of SGR 1806-20
  90. GRB 131108A: AGILE/GRID observation
  91. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  92. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  93. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  94. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  95. GRB 130907A: INTEGRAL/SPI-ACS light curve
  96. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  97. Trigger 565443: Swift detection of a burst from SGR J1745-29
  98. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  99. GRB 130609B: Swift/UVOT Observations
  100. Trigger 557640: Swift detection of burst from SGR J1745-29

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