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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"

320 results found.

  1. LIGO/Virgo S190910h: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  2. LIGO/Virgo S190910d: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  3. LIGO/Virgo S190901ap: No counterpart candidates in INTEGRAL SPI-ACS,prompt observation
  4. LIGO/Virgo S190828l: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  5. LIGO/Virgo S190828j: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  6. Fermi GBM-190816: Location-dependent upper limits from INTEGRAL/SPI-ACS prompt observation
  7. IceCube-190819A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  8. HAWC-190806A: upper limits from INTEGRAL SPI-ACS and IBIS prompt observation
  9. IceCube 190730A: one weakly associated counterpart candidates in INTEGRAL SPI-ACS, and IBIS prompt observation
  10. Fermi-LAT Gamma-ray Observations of IceCube-190712A
  11. Fermi-LAT Gamma-ray Observations of IceCube-190504A
  12. LIGO/Virgo S190426c: Fermi-LAT search for a high-energy gamma-ray counterpart
  13. INTEGRAL observations of the events in the GWTC-1 catalog
  14. GRB 181201A: a long GRB detected by INTEGRAL
  15. GRB 180809A: further Swift/XRT observations
  16. GRB 180728A: VLT/X-shooter redshift of a nearby energetic GRB
  17. LIGO/Virgo G298048: Chandra X-ray Update on GW170817
  18. LIGO/Virgo G298048: Discovery of X-ray emission from SSS17a in NGC4993
  19. LIGO/Virgo G298936: Astrosat CZTI upper limits
  20. LIGO/Virgo G298048: INTEGRAL pointed follow-up observations
  21. LIGO/Virgo G298048: Chandra X-ray observations
  22. GRB170730A detecetd by INTEGRAL. Refined analysis
  23. LIGO/Virgo G268556/GW170104: Lomonosov BDRG observations
  24. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  25. GRB 160401A: a long GRB detected by INTEGRAL
  26. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  27. GRB 150912A: A long GRB detected by INTEGRAL
  28. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  29. Fermi GBM triggers bn150715759 and bn150715817 are not due to GRBs
  30. Trigger 649113: Swift detection of SGR 1E 1841-045
  31. Swift trigger 642453 is not an astrophysical source
  32. GRB 140710B: a long GRB detected with INTEGRAL
  33. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  34. Swift detection of a bright X-ray source in M31
  35. GRB 131108A: AGILE/GRID observation
  36. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  37. GRB 130907A: INTEGRAL/SPI-ACS light curve
  38. GRB 130513A: a long GRB detected by INTEGRAL
  39. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  40. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  41. GRB 121102A : a long GRB detected by INTEGRAL
  42. GRB 121027A: Swift-XRT refined Analysis
  43. Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
  44. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  45. GRB 120624B: Swift-XRT observations
  46. GRB 120512A: A long GRB detected by INTEGRAL
  47. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  48. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  49. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  50. SGR 1E 1841-045: Swift-BAT refined analysis
  51. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  52. GRB 110625A: Fermi GBM and LAT observations
  53. SGR 1E 1841-045: Swift-BAT refined analysis
  54. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  55. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  56. Fermi GBM detection of an SGR-like burst
  57. Swift-BAT refined analysis of outburst from 1E 1841-04.5
  58. Fermi GBM detection of a burst from 1E 1841-045
  59. SGR-like outburst from the magnetar 1E 1841-04.5
  60. GRB 110112B: A short GRB detected by INTEGRAL
  61. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  62. GRB 100316D: Pre-burst emission measured by BAT
  63. GRB 090709A: Quasiperiodic variations in the BAT light curve
  64. XRF 090702: Swift-XRT refined analysis
  65. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  66. SGR J1550-5418
  67. IBAS Alert N. 5442 is not a GRB
  68. Suzaku ToO Observation of AXP 1E 1547.0-5408
  69. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  70. GRB 081222: Swift XRT refined analysis
  71. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  72. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  73. GRB080818B: GLAST Burst Monitor detection
  74. GRB 080520: Swift XRT Refined Analysis
  75. GRB 080205: Swift XRT refined analysis
  76. GRB 080121: Upper limit on X-ray afterglow
  77. GRB080120: Swift XRT position
  78. Swift XRT follow-up observations of GRB071008
  79. GRB 071003: XRT refined analysis
  80. GRB 070729: Swift-XRT refined analysis
  81. GRB 070520B: Swift-XRT refined analysis
  82. GRB 070520A: Swift-XRT refined analysis
  83. GRB070224: Swift-XRT Refined Analysis
  84. GRB070107: Swift/XRT refined analysis
  85. Retractions of previous Swift-BAT triggers
  86. GRB061222B: Swift-XRT Refined Analysis
  87. GRB061025: Swift XRT refined analysis
  88. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  89. GRB 060729: An update on the late-time Swift observations
  90. GRB 060926: Swift XRT refined analysis
  91. Two bright bursts from SGR 1806-20 detected with IBAS
  92. GRB060213: Swift XRT observations and possible afterglow candidate
  93. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  94. Swift XRT Observation of GRB 060204C
  95. GRB060203: Swift XRT Team Refined Analysis
  96. Possible GRB 050922 detected by INTEGRAL
  97. GRB 050716: Refined XRT analysis.
  98. GRB 050509B: Swift/XRT refined analysis
  99. GRB 050502 - A long GRB detected with INTEGRAL
  100. SGR 1806-20, RHESSI observations of the 041227 giant flare

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