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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"

318 results found.

  1. LIGO/Virgo S190901ap: No counterpart candidates in INTEGRAL SPI-ACS,prompt observation
  2. LIGO/Virgo S190828l: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  3. LIGO/Virgo S190828j: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  4. Fermi GBM-190816: Location-dependent upper limits from INTEGRAL/SPI-ACS prompt observation
  5. IceCube-190819A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  6. HAWC-190806A: upper limits from INTEGRAL SPI-ACS and IBIS prompt observation
  7. IceCube 190730A: one weakly associated counterpart candidates in INTEGRAL SPI-ACS, and IBIS prompt observation
  8. Fermi-LAT Gamma-ray Observations of IceCube-190712A
  9. Fermi-LAT Gamma-ray Observations of IceCube-190504A
  10. LIGO/Virgo S190426c: Fermi-LAT search for a high-energy gamma-ray counterpart
  11. INTEGRAL observations of the events in the GWTC-1 catalog
  12. GRB 181201A: a long GRB detected by INTEGRAL
  13. GRB 180809A: further Swift/XRT observations
  14. GRB 180728A: VLT/X-shooter redshift of a nearby energetic GRB
  15. LIGO/Virgo G298048: Chandra X-ray Update on GW170817
  16. LIGO/Virgo G298048: Discovery of X-ray emission from SSS17a in NGC4993
  17. LIGO/Virgo G298936: Astrosat CZTI upper limits
  18. LIGO/Virgo G298048: INTEGRAL pointed follow-up observations
  19. LIGO/Virgo G298048: Chandra X-ray observations
  20. GRB170730A detecetd by INTEGRAL. Refined analysis
  21. LIGO/Virgo G268556/GW170104: Lomonosov BDRG observations
  22. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  23. GRB 160401A: a long GRB detected by INTEGRAL
  24. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  25. GRB 150912A: A long GRB detected by INTEGRAL
  26. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  27. Fermi GBM triggers bn150715759 and bn150715817 are not due to GRBs
  28. Trigger 649113: Swift detection of SGR 1E 1841-045
  29. Swift trigger 642453 is not an astrophysical source
  30. GRB 140710B: a long GRB detected with INTEGRAL
  31. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  32. Swift detection of a bright X-ray source in M31
  33. GRB 131108A: AGILE/GRID observation
  34. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  35. GRB 130907A: INTEGRAL/SPI-ACS light curve
  36. GRB 130513A: a long GRB detected by INTEGRAL
  37. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  38. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  39. GRB 121102A : a long GRB detected by INTEGRAL
  40. GRB 121027A: Swift-XRT refined Analysis
  41. Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
  42. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  43. GRB 120624B: Swift-XRT observations
  44. GRB 120512A: A long GRB detected by INTEGRAL
  45. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  46. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  47. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  48. SGR 1E 1841-045: Swift-BAT refined analysis
  49. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  50. GRB 110625A: Fermi GBM and LAT observations
  51. SGR 1E 1841-045: Swift-BAT refined analysis
  52. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  53. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  54. Fermi GBM detection of an SGR-like burst
  55. Swift-BAT refined analysis of outburst from 1E 1841-04.5
  56. Fermi GBM detection of a burst from 1E 1841-045
  57. SGR-like outburst from the magnetar 1E 1841-04.5
  58. GRB 110112B: A short GRB detected by INTEGRAL
  59. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  60. GRB 100316D: Pre-burst emission measured by BAT
  61. GRB 090709A: Quasiperiodic variations in the BAT light curve
  62. XRF 090702: Swift-XRT refined analysis
  63. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  64. SGR J1550-5418
  65. IBAS Alert N. 5442 is not a GRB
  66. Suzaku ToO Observation of AXP 1E 1547.0-5408
  67. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  68. GRB 081222: Swift XRT refined analysis
  69. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  70. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  71. GRB080818B: GLAST Burst Monitor detection
  72. GRB 080520: Swift XRT Refined Analysis
  73. GRB 080205: Swift XRT refined analysis
  74. GRB 080121: Upper limit on X-ray afterglow
  75. GRB080120: Swift XRT position
  76. Swift XRT follow-up observations of GRB071008
  77. GRB 071003: XRT refined analysis
  78. GRB 070729: Swift-XRT refined analysis
  79. GRB 070520B: Swift-XRT refined analysis
  80. GRB 070520A: Swift-XRT refined analysis
  81. GRB070224: Swift-XRT Refined Analysis
  82. GRB070107: Swift/XRT refined analysis
  83. Retractions of previous Swift-BAT triggers
  84. GRB061222B: Swift-XRT Refined Analysis
  85. GRB061025: Swift XRT refined analysis
  86. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  87. GRB 060729: An update on the late-time Swift observations
  88. GRB 060926: Swift XRT refined analysis
  89. Two bright bursts from SGR 1806-20 detected with IBAS
  90. GRB060213: Swift XRT observations and possible afterglow candidate
  91. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  92. Swift XRT Observation of GRB 060204C
  93. GRB060203: Swift XRT Team Refined Analysis
  94. Possible GRB 050922 detected by INTEGRAL
  95. GRB 050716: Refined XRT analysis.
  96. GRB 050509B: Swift/XRT refined analysis
  97. GRB 050502 - A long GRB detected with INTEGRAL
  98. SGR 1806-20, RHESSI observations of the 041227 giant flare
  99. GRB041220: Swift-BAT burst
  100. Swift-BAT detection of the bright long burst GRB041219

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