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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"

901 results found.

  1. Swift trigger 933276 MASTER observation
  2. Trigger 933285: Swift detection of the brightest burst so far from SGR 1935+2154
  3. Trigger 933276: Swift detection of further activity from SGR 1935+2154
  4. Fermi GBM GRB 191104C (trigger 594592184 / 191104854) is not a GRB
  5. Fermi GBM GRBs 191104 A, B, C and triggers 594534420/191104185 and 594563923/191104527 are not GRBs
  6. SGR 1935+2154: Swift-BAT refined analysis
  7. GRB 191104B/GRB 191104C are SGR 1935+2154
  8. Trigger 933083: Swift detection of SGR 1935+2154
  9. Fermi GBM triggers 594523229/191104056 and 594528816/191104120 are not GRBs
  10. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  11. IceCube-191001A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  12. LIGO/Virgo S190930t: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  13. LIGO/Virgo S190930s: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  14. Fermi-LAT Gamma-ray Observations of IceCube-190922B
  15. LIGO/Virgo S190924h: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  16. LIGO/Virgo S190923y: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  17. IceCube-190922A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  18. HAWC-190916A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  19. LIGO/Virgo S190915ak: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  20. LIGO/Virgo S190910h: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  21. LIGO/Virgo S190910d: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  22. LIGO/Virgo S190901ap: No counterpart candidates in INTEGRAL SPI-ACS,prompt observation
  23. LIGO/Virgo S190828l: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  24. LIGO/Virgo S190828j: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  25. Fermi GBM-190816: Location-dependent upper limits from INTEGRAL/SPI-ACS prompt observation
  26. IceCube-190819A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  27. HAWC-190806A: upper limits from INTEGRAL SPI-ACS and IBIS prompt observation
  28. IceCube 190730A: one weakly associated counterpart candidates in INTEGRAL SPI-ACS, and IBIS prompt observation
  29. Fermi-LAT Gamma-ray Observations of IceCube-190712A
  30. Fermi-LAT Gamma-ray Observations of IceCube-190504A
  31. LIGO/Virgo S190426c: Fermi-LAT search for a high-energy gamma-ray counterpart
  32. LIGO/Virgo S190425z: Las Cumbres Observatory Galaxy Targeted Counterpart Search
  33. GRB 190326A: Swift XRT and UVOT follow-up observations
  34. GRB 190326A: Swift-BAT refined analysis - a soft-short GRB or an SGR
  35. INTEGRAL observations of the events in the GWTC-1 catalog
  36. GRB 181201A: a long GRB detected by INTEGRAL
  37. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
  38. GRB 180809A: further Swift/XRT observations
  39. GRB 180701A/MAXI J2119-045: CALET Gamma-Ray Burst Monitor data search
  40. GRB 180728A: VLT/X-shooter redshift of a nearby energetic GRB
  41. Fermi GBM triggers 552488966/180705548 and 552490104/180705561 are not GRBs
  42. GRB 180701A: MAXI/GSC detection
  43. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  44. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  45. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  46. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  47. LIGO/Virgo G298048: Chandra X-ray Update on GW170817
  48. LIGO/Virgo G298048: Discovery of X-ray emission from SSS17a in NGC4993
  49. LIGO/Virgo G298936: Astrosat CZTI upper limits
  50. LIGO/Virgo G298048: INTEGRAL pointed follow-up observations
  51. LIGO/Virgo G298048: Chandra X-ray observations
  52. GRB170730A detecetd by INTEGRAL. Refined analysis
  53. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  54. GRB 170524A: Swift detection of a burst (or possible new SGR)
  55. LIGO/Virgo G275697: DLT40 follow-up observation
  56. LIGO/Virgo G268556/GW170104: Lomonosov BDRG observations
  57. GRB 160821B: Swift-BAT refined analysis
  58. GBM observation of SGR-like burst from the direction of PSR 1119-6127
  59. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  60. GRB 160703, GRB 160705, GRB 160720, SGR1935+2154: First SGRs and GRBs detected by Lomonosov.
  61. SGR 1935+2154: CALET Gamma-Ray Burst Monitor detections
  62. Konus-Wind observation of a bright burst from SGR 1935+2154
  63. SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
  64. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  65. Swift-BAT refined analysis on the bright event from SGR 1935+2154
  66. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  67. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  68. Trigger 701182: Swift detection of SGR 1935+2154
  69. SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
  70. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  71. Fermi GBM Trigger 160622573 is not a GRB
  72. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  73. More FERMI GBM bursts from the magnetar SGR 1935+2154
  74. SGR 1935+2154: MAXI/GSC detection
  75. Fermi GBM trigger 488128598/160620637 is not a GRB
  76. Fermi GBM trigger 487974449/160618852 is not a GRB
  77. Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
  78. Trigger 689353: Swift detection of a transient near Sgr A*
  79. Fermi GBM trigger 486562774/160602514 is not a GRB
  80. Another Swift detection of SGR 1935+2154 (trigger #687124)
  81. Swift detection of SGR 1935+2154
  82. Konus-Wind observation of a bright burst from SGR 1935+2154
  83. FERMI GBM bursts from the magnetar SGR 1935+2154
  84. SGR 1935+2154: AbAO optical upper limit
  85. Fermi GBM triggers of SGR 1935+2154
  86. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  87. Fermi GBM trigger 485124591/160516868 is not a GRB
  88. Trigger 686443: Swift detection of SGR 1935+2154
  89. Fermi GBM trigger 484906918/160514349 is not a GRB
  90. GRB 160401A: a long GRB detected by INTEGRAL
  91. SGR 0755-2933, Swift-BAT refined analysis
  92. Swift detection of a likely new SGR: SGR 0755-2933
  93. IBAS Alert 7313 is SGR J1935+2154
  94. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  95. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  96. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  97. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  98. GRB 150912A: A long GRB detected by INTEGRAL
  99. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  100. Fermi GBM triggers bn150715759 and bn150715817 are not due to GRBs

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