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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"

313 results found.

  1. HAWC-190806A: upper limits from INTEGRAL SPI-ACS and IBIS prompt observation
  2. IceCube 190730A: one weakly associated counterpart candidates in INTEGRAL SPI-ACS, and IBIS prompt observation
  3. Fermi-LAT Gamma-ray Observations of IceCube-190712A
  4. Fermi-LAT Gamma-ray Observations of IceCube-190504A
  5. LIGO/Virgo S190426c: Fermi-LAT search for a high-energy gamma-ray counterpart
  6. INTEGRAL observations of the events in the GWTC-1 catalog
  7. GRB 181201A: a long GRB detected by INTEGRAL
  8. GRB 180809A: further Swift/XRT observations
  9. GRB 180728A: VLT/X-shooter redshift of a nearby energetic GRB
  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. LIGO/Virgo G268556/GW170104: Lomonosov BDRG observations
  17. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  18. GRB 160401A: a long GRB detected by INTEGRAL
  19. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  20. GRB 150912A: A long GRB detected by INTEGRAL
  21. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  22. Fermi GBM triggers bn150715759 and bn150715817 are not due to GRBs
  23. Trigger 649113: Swift detection of SGR 1E 1841-045
  24. Swift trigger 642453 is not an astrophysical source
  25. GRB 140710B: a long GRB detected with INTEGRAL
  26. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  27. Swift detection of a bright X-ray source in M31
  28. GRB 131108A: AGILE/GRID observation
  29. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  30. GRB 130907A: INTEGRAL/SPI-ACS light curve
  31. GRB 130513A: a long GRB detected by INTEGRAL
  32. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  33. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  34. GRB 121102A : a long GRB detected by INTEGRAL
  35. GRB 121027A: Swift-XRT refined Analysis
  36. Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
  37. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  38. GRB 120624B: Swift-XRT observations
  39. GRB 120512A: A long GRB detected by INTEGRAL
  40. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  41. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  42. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  43. SGR 1E 1841-045: Swift-BAT refined analysis
  44. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  45. GRB 110625A: Fermi GBM and LAT observations
  46. SGR 1E 1841-045: Swift-BAT refined analysis
  47. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  48. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  49. Fermi GBM detection of an SGR-like burst
  50. Swift-BAT refined analysis of outburst from 1E 1841-04.5
  51. Fermi GBM detection of a burst from 1E 1841-045
  52. SGR-like outburst from the magnetar 1E 1841-04.5
  53. GRB 110112B: A short GRB detected by INTEGRAL
  54. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  55. GRB 100316D: Pre-burst emission measured by BAT
  56. GRB 090709A: Quasiperiodic variations in the BAT light curve
  57. XRF 090702: Swift-XRT refined analysis
  58. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  59. SGR J1550-5418
  60. IBAS Alert N. 5442 is not a GRB
  61. Suzaku ToO Observation of AXP 1E 1547.0-5408
  62. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  63. GRB 081222: Swift XRT refined analysis
  64. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  65. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  66. GRB080818B: GLAST Burst Monitor detection
  67. GRB 080520: Swift XRT Refined Analysis
  68. GRB 080205: Swift XRT refined analysis
  69. GRB 080121: Upper limit on X-ray afterglow
  70. GRB080120: Swift XRT position
  71. Swift XRT follow-up observations of GRB071008
  72. GRB 071003: XRT refined analysis
  73. GRB 070729: Swift-XRT refined analysis
  74. GRB 070520B: Swift-XRT refined analysis
  75. GRB 070520A: Swift-XRT refined analysis
  76. GRB070224: Swift-XRT Refined Analysis
  77. GRB070107: Swift/XRT refined analysis
  78. Retractions of previous Swift-BAT triggers
  79. GRB061222B: Swift-XRT Refined Analysis
  80. GRB061025: Swift XRT refined analysis
  81. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  82. GRB 060729: An update on the late-time Swift observations
  83. GRB 060926: Swift XRT refined analysis
  84. Two bright bursts from SGR 1806-20 detected with IBAS
  85. GRB060213: Swift XRT observations and possible afterglow candidate
  86. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  87. Swift XRT Observation of GRB 060204C
  88. GRB060203: Swift XRT Team Refined Analysis
  89. Possible GRB 050922 detected by INTEGRAL
  90. GRB 050716: Refined XRT analysis.
  91. GRB 050509B: Swift/XRT refined analysis
  92. GRB 050502 - A long GRB detected with INTEGRAL
  93. SGR 1806-20, RHESSI observations of the 041227 giant flare
  94. GRB041220: Swift-BAT burst
  95. Swift-BAT detection of the bright long burst GRB041219
  96. GRB 041219 - A long GRB detected by INTEGRAL
  97. XMM-Newton Images of GRB 040827
  98. XRF040701: Second-Epoch Chandra Observations
  99. XRF040701: First-Epoch Chandra Observations
  100. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC

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