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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"

343 results found.

  1. IceCube-191119A - No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  2. LIGO/Virgo S191110af: Potential pulsar counterparts
  3. Konus-Wind observation of the recent SGR 1935+2154 activity
  4. LIGO/Virgo S191110af: No counterpart candidates in INTEGRAL SPI-ACS, and IBIS prompt observation
  5. LIGO/Virgo S191110af: No counterpart candidates in INTEGRAL SPI-ACS, prompt observation
  6. LIGO/Virgo S191109d: No counterpart candidates in INTEGRAL SPI-ACS,prompt observation
  7. LIGO/Virgo S191105e: No counterpart candidates in INTEGRAL SPI-ACS and,IBIS prompt observation
  8. IceCube-191001A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  9. LIGO/Virgo S190930t: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  10. LIGO/Virgo S190930s: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  11. Fermi-LAT Gamma-ray Observations of IceCube-190922B
  12. LIGO/Virgo S190924h: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  13. LIGO/Virgo S190923y: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  14. IceCube-190922A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  15. HAWC-190916A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  16. LIGO/Virgo S190915ak: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  17. LIGO/Virgo S190910h: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  18. LIGO/Virgo S190910d: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  19. LIGO/Virgo S190901ap: No counterpart candidates in INTEGRAL SPI-ACS,prompt observation
  20. LIGO/Virgo S190828l: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  21. LIGO/Virgo S190828j: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  22. Fermi GBM-190816: Location-dependent upper limits from INTEGRAL/SPI-ACS prompt observation
  23. IceCube-190819A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  24. HAWC-190806A: upper limits from INTEGRAL SPI-ACS and IBIS prompt observation
  25. IceCube 190730A: one weakly associated counterpart candidates in INTEGRAL SPI-ACS, and IBIS prompt observation
  26. Fermi-LAT Gamma-ray Observations of IceCube-190712A
  27. Fermi-LAT Gamma-ray Observations of IceCube-190504A
  28. LIGO/Virgo S190426c: Fermi-LAT search for a high-energy gamma-ray counterpart
  29. LIGO/Virgo S190425z: Las Cumbres Observatory Galaxy Targeted Counterpart Search
  30. INTEGRAL observations of the events in the GWTC-1 catalog
  31. GRB 181201A: a long GRB detected by INTEGRAL
  32. GRB 180809A: further Swift/XRT observations
  33. GRB 180701A/MAXI J2119-045: CALET Gamma-Ray Burst Monitor data search
  34. GRB 180728A: VLT/X-shooter redshift of a nearby energetic GRB
  35. GRB 180701A: MAXI/GSC detection
  36. LIGO/Virgo G298048: Chandra X-ray Update on GW170817
  37. LIGO/Virgo G298048: Discovery of X-ray emission from SSS17a in NGC4993
  38. LIGO/Virgo G298936: Astrosat CZTI upper limits
  39. LIGO/Virgo G298048: INTEGRAL pointed follow-up observations
  40. LIGO/Virgo G298048: Chandra X-ray observations
  41. GRB170730A detecetd by INTEGRAL. Refined analysis
  42. LIGO/Virgo G275697: DLT40 follow-up observation
  43. LIGO/Virgo G268556/GW170104: Lomonosov BDRG observations
  44. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  45. GRB 160401A: a long GRB detected by INTEGRAL
  46. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  47. GRB 150912A: A long GRB detected by INTEGRAL
  48. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  49. Fermi GBM triggers bn150715759 and bn150715817 are not due to GRBs
  50. Trigger 649113: Swift detection of SGR 1E 1841-045
  51. Swift trigger 642453 is not an astrophysical source
  52. GRB 140710B: a long GRB detected with INTEGRAL
  53. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  54. Swift detection of a bright X-ray source in M31
  55. GRB 131108A: AGILE/GRID observation
  56. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  57. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  58. GRB 130907A: INTEGRAL/SPI-ACS light curve
  59. GRB 130609B: Swift/UVOT Observations
  60. GRB 130513A: a long GRB detected by INTEGRAL
  61. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  62. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  63. GRB 121102A : a long GRB detected by INTEGRAL
  64. GRB 121027A: Swift-XRT refined Analysis
  65. Fermi/GBM detection of an SGR-like burst
  66. Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
  67. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  68. GRB 120624B: Swift-XRT observations
  69. GRB 120512A: A long GRB detected by INTEGRAL
  70. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  71. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  72. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  73. SGR 1E 1841-045: Swift-BAT refined analysis
  74. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  75. GRB 110625A: Fermi GBM and LAT observations
  76. SGR 1E 1841-045: Swift-BAT refined analysis
  77. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  78. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  79. Fermi GBM detection of an SGR-like burst
  80. Swift-BAT refined analysis of outburst from 1E 1841-04.5
  81. Fermi GBM detection of a burst from 1E 1841-045
  82. SGR-like outburst from the magnetar 1E 1841-04.5
  83. GRB 110112B: A short GRB detected by INTEGRAL
  84. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  85. GRB 100316D: Pre-burst emission measured by BAT
  86. GRB 090709A: Quasiperiodic variations in the BAT light curve
  87. XRF 090702: Swift-XRT refined analysis
  88. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  89. SGR J1550-5418
  90. IBAS Alert N. 5442 is not a GRB
  91. Suzaku ToO Observation of AXP 1E 1547.0-5408
  92. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  93. GRB 090111: Swift UVOT Upper Limits
  94. GRB 081222: Swift XRT refined analysis
  95. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  96. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  97. GRB080818B: GLAST Burst Monitor detection
  98. GRB 080520: Swift XRT Refined Analysis
  99. GRB 080205: Swift XRT refined analysis
  100. GRB 080121: Upper limit on X-ray afterglow

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