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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"

326 results found.

  1. Fermi-LAT Gamma-ray Observations of IceCube-190922B
  2. LIGO/Virgo S190924h: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  3. LIGO/Virgo S190923y: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  4. IceCube-190922A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  5. HAWC-190916A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  6. LIGO/Virgo S190915ak: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  7. LIGO/Virgo S190910h: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  8. LIGO/Virgo S190910d: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  9. LIGO/Virgo S190901ap: No counterpart candidates in INTEGRAL SPI-ACS,prompt observation
  10. LIGO/Virgo S190828l: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  11. LIGO/Virgo S190828j: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  12. Fermi GBM-190816: Location-dependent upper limits from INTEGRAL/SPI-ACS prompt observation
  13. IceCube-190819A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  14. HAWC-190806A: upper limits from INTEGRAL SPI-ACS and IBIS prompt observation
  15. IceCube 190730A: one weakly associated counterpart candidates in INTEGRAL SPI-ACS, and IBIS prompt observation
  16. Fermi-LAT Gamma-ray Observations of IceCube-190712A
  17. Fermi-LAT Gamma-ray Observations of IceCube-190504A
  18. LIGO/Virgo S190426c: Fermi-LAT search for a high-energy gamma-ray counterpart
  19. INTEGRAL observations of the events in the GWTC-1 catalog
  20. GRB 181201A: a long GRB detected by INTEGRAL
  21. GRB 180809A: further Swift/XRT observations
  22. GRB 180728A: VLT/X-shooter redshift of a nearby energetic GRB
  23. LIGO/Virgo G298048: Chandra X-ray Update on GW170817
  24. LIGO/Virgo G298048: Discovery of X-ray emission from SSS17a in NGC4993
  25. LIGO/Virgo G298936: Astrosat CZTI upper limits
  26. LIGO/Virgo G298048: INTEGRAL pointed follow-up observations
  27. LIGO/Virgo G298048: Chandra X-ray observations
  28. GRB170730A detecetd by INTEGRAL. Refined analysis
  29. LIGO/Virgo G268556/GW170104: Lomonosov BDRG observations
  30. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  31. GRB 160401A: a long GRB detected by INTEGRAL
  32. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  33. GRB 150912A: A long GRB detected by INTEGRAL
  34. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  35. Fermi GBM triggers bn150715759 and bn150715817 are not due to GRBs
  36. Trigger 649113: Swift detection of SGR 1E 1841-045
  37. Swift trigger 642453 is not an astrophysical source
  38. GRB 140710B: a long GRB detected with INTEGRAL
  39. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  40. Swift detection of a bright X-ray source in M31
  41. GRB 131108A: AGILE/GRID observation
  42. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  43. GRB 130907A: INTEGRAL/SPI-ACS light curve
  44. GRB 130513A: a long GRB detected by INTEGRAL
  45. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  46. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  47. GRB 121102A : a long GRB detected by INTEGRAL
  48. GRB 121027A: Swift-XRT refined Analysis
  49. Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
  50. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  51. GRB 120624B: Swift-XRT observations
  52. GRB 120512A: A long GRB detected by INTEGRAL
  53. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  54. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  55. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  56. SGR 1E 1841-045: Swift-BAT refined analysis
  57. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  58. GRB 110625A: Fermi GBM and LAT observations
  59. SGR 1E 1841-045: Swift-BAT refined analysis
  60. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  61. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  62. Fermi GBM detection of an SGR-like burst
  63. Swift-BAT refined analysis of outburst from 1E 1841-04.5
  64. Fermi GBM detection of a burst from 1E 1841-045
  65. SGR-like outburst from the magnetar 1E 1841-04.5
  66. GRB 110112B: A short GRB detected by INTEGRAL
  67. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  68. GRB 100316D: Pre-burst emission measured by BAT
  69. GRB 090709A: Quasiperiodic variations in the BAT light curve
  70. XRF 090702: Swift-XRT refined analysis
  71. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  72. SGR J1550-5418
  73. IBAS Alert N. 5442 is not a GRB
  74. Suzaku ToO Observation of AXP 1E 1547.0-5408
  75. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  76. GRB 081222: Swift XRT refined analysis
  77. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  78. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  79. GRB080818B: GLAST Burst Monitor detection
  80. GRB 080520: Swift XRT Refined Analysis
  81. GRB 080205: Swift XRT refined analysis
  82. GRB 080121: Upper limit on X-ray afterglow
  83. GRB080120: Swift XRT position
  84. Swift XRT follow-up observations of GRB071008
  85. GRB 071003: XRT refined analysis
  86. GRB 070729: Swift-XRT refined analysis
  87. GRB 070520B: Swift-XRT refined analysis
  88. GRB 070520A: Swift-XRT refined analysis
  89. GRB070224: Swift-XRT Refined Analysis
  90. GRB070107: Swift/XRT refined analysis
  91. Retractions of previous Swift-BAT triggers
  92. GRB061222B: Swift-XRT Refined Analysis
  93. GRB061025: Swift XRT refined analysis
  94. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  95. GRB 060729: An update on the late-time Swift observations
  96. GRB 060926: Swift XRT refined analysis
  97. Two bright bursts from SGR 1806-20 detected with IBAS
  98. GRB060213: Swift XRT observations and possible afterglow candidate
  99. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  100. Swift XRT Observation of GRB 060204C

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