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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.

Lucene Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

864 results found.

  1. GRB 180809A: further Swift/XRT observations
  2. GRB 180701A/MAXI J2119-045: CALET Gamma-Ray Burst Monitor data search
  3. GRB 180728A: VLT/X-shooter redshift of a nearby energetic GRB
  4. Fermi GBM triggers 552488966/180705548 and 552490104/180705561 are not GRBs
  5. GRB 180701A: MAXI/GSC detection
  6. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  7. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  8. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  9. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  10. LIGO/Virgo G298048: Chandra X-ray Update on GW170817
  11. LIGO/Virgo G298048: Discovery of X-ray emission from SSS17a in NGC4993
  12. LIGO/Virgo G298936: Astrosat CZTI upper limits
  13. LIGO/Virgo G298048: INTEGRAL pointed follow-up observations
  14. LIGO/Virgo G298048: Chandra X-ray observations
  15. GRB170730A detecetd by INTEGRAL. Refined analysis
  16. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  17. GRB 170524A: Swift detection of a burst (or possible new SGR)
  18. LIGO/Virgo G275697: DLT40 follow-up observation
  19. LIGO/Virgo G268556/GW170104: Lomonosov BDRG observations
  20. GRB 160821B: Swift-BAT refined analysis
  21. GBM observation of SGR-like burst from the direction of PSR 1119-6127
  22. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  23. GRB 160703, GRB 160705, GRB 160720, SGR1935+2154: First SGRs and GRBs detected by Lomonosov.
  24. SGR 1935+2154: CALET Gamma-Ray Burst Monitor detections
  25. Konus-Wind observation of a bright burst from SGR 1935+2154
  26. SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
  27. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  28. Swift-BAT refined analysis on the bright event from SGR 1935+2154
  29. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  30. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  31. Trigger 701182: Swift detection of SGR 1935+2154
  32. SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
  33. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  34. Fermi GBM Trigger 160622573 is not a GRB
  35. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  36. More FERMI GBM bursts from the magnetar SGR 1935+2154
  37. SGR 1935+2154: MAXI/GSC detection
  38. Fermi GBM trigger 488128598/160620637 is not a GRB
  39. Fermi GBM trigger 487974449/160618852 is not a GRB
  40. Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
  41. Trigger 689353: Swift detection of a transient near Sgr A*
  42. Fermi GBM trigger 486562774/160602514 is not a GRB
  43. Another Swift detection of SGR 1935+2154 (trigger #687124)
  44. Swift detection of SGR 1935+2154
  45. Konus-Wind observation of a bright burst from SGR 1935+2154
  46. FERMI GBM bursts from the magnetar SGR 1935+2154
  47. SGR 1935+2154: AbAO optical upper limit
  48. Fermi GBM triggers of SGR 1935+2154
  49. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  50. Fermi GBM trigger 485124591/160516868 is not a GRB
  51. Trigger 686443: Swift detection of SGR 1935+2154
  52. Fermi GBM trigger 484906918/160514349 is not a GRB
  53. GRB 160401A: a long GRB detected by INTEGRAL
  54. SGR 0755-2933, Swift-BAT refined analysis
  55. Swift detection of a likely new SGR: SGR 0755-2933
  56. IBAS Alert 7313 is SGR J1935+2154
  57. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  58. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  59. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  60. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  61. GRB 150912A: A long GRB detected by INTEGRAL
  62. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  63. Fermi GBM triggers bn150715759 and bn150715817 are not due to GRBs
  64. Trigger 649113: Swift detection of SGR 1E 1841-045
  65. Swift-XRT observations of GRB 150710A
  66. Swift trigger 642453 is not an astrophysical source
  67. Konus-Wind observation of a bright burst from SGR 1935+2154
  68. IPN Triangulation of a bright burst from SGR 1935+2154
  69. GRB 150301A: Swift-BAT refined analysis
  70. GRB 150301A: Fermi GBM observation
  71. GRB 150301A: Swift detection of a short burst or new SGR
  72. Fermi GBM Observations of SGR 1935+2154
  73. Fermi GBM trigger 150223068 is not a GRB
  74. SGR 1935+2154: Swift-BAT refined analysis
  75. Swift detection of an outburst from SGR 1935+2154
  76. Trigger 607399: Swift detection of SGR1806-20
  77. Fermi GBM Observations of SGR 1935+2154
  78. GRB 140710B: a long GRB detected with INTEGRAL
  79. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  80. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  81. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  82. SGR 1935+2154: Swift-BAT observations of additional short soft events
  83. GRB 140705A / SGR 1935+2154: FTN observations
  84. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  85. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  86. Swift detection of a bright X-ray source in M31
  87. Fermi GBM Trigger 140429551 - Detection of a burst from SGR 1806-20
  88. Trigger 597570: Swift detection of SGR 1806-20
  89. GRB 131108A: AGILE/GRID observation
  90. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  91. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  92. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  93. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  94. GRB 130907A: INTEGRAL/SPI-ACS light curve
  95. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  96. Trigger 565443: Swift detection of a burst from SGR J1745-29
  97. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  98. GRB 130609B: Swift/UVOT Observations
  99. Trigger 557640: Swift detection of burst from SGR J1745-29
  100. GRB 130513A: a long GRB detected by INTEGRAL

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