Skip to main content
New! Browse Circulars by Event, Advanced Search, Sample Codes, Schema Release. See news and announcements

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"

322 results found.

  1. Fermi GBM-190816: Location-dependent upper limits from INTEGRAL/SPI-ACS prompt observation
  2. IceCube-190819A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  3. HAWC-190806A: upper limits from INTEGRAL SPI-ACS and IBIS prompt observation
  4. IceCube 190730A: one weakly associated counterpart candidates in INTEGRAL SPI-ACS, and IBIS prompt observation
  5. Fermi-LAT Gamma-ray Observations of IceCube-190712A
  6. Fermi-LAT Gamma-ray Observations of IceCube-190504A
  7. LIGO/Virgo S190426c: Fermi-LAT search for a high-energy gamma-ray counterpart
  8. LIGO/Virgo S190425z: Las Cumbres Observatory Galaxy Targeted Counterpart Search
  9. INTEGRAL observations of the events in the GWTC-1 catalog
  10. GRB 181201A: a long GRB detected by INTEGRAL
  11. GRB 180809A: further Swift/XRT observations
  12. GRB 180701A/MAXI J2119-045: CALET Gamma-Ray Burst Monitor data search
  13. GRB 180728A: VLT/X-shooter redshift of a nearby energetic GRB
  14. GRB 180701A: MAXI/GSC detection
  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 G275697: DLT40 follow-up observation
  22. LIGO/Virgo G268556/GW170104: Lomonosov BDRG observations
  23. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  24. GRB 160401A: a long GRB detected by INTEGRAL
  25. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  26. GRB 150912A: A long GRB detected by INTEGRAL
  27. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  28. Fermi GBM triggers bn150715759 and bn150715817 are not due to GRBs
  29. Trigger 649113: Swift detection of SGR 1E 1841-045
  30. Swift trigger 642453 is not an astrophysical source
  31. GRB 140710B: a long GRB detected with INTEGRAL
  32. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  33. Swift detection of a bright X-ray source in M31
  34. GRB 131108A: AGILE/GRID observation
  35. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  36. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  37. GRB 130907A: INTEGRAL/SPI-ACS light curve
  38. GRB 130609B: Swift/UVOT Observations
  39. GRB 130513A: a long GRB detected by INTEGRAL
  40. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  41. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  42. GRB 121102A : a long GRB detected by INTEGRAL
  43. GRB 121027A: Swift-XRT refined Analysis
  44. Fermi/GBM detection of an SGR-like burst
  45. Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
  46. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  47. GRB 120624B: Swift-XRT observations
  48. GRB 120512A: A long GRB detected by INTEGRAL
  49. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  50. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  51. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  52. SGR 1E 1841-045: Swift-BAT refined analysis
  53. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  54. GRB 110625A: Fermi GBM and LAT observations
  55. SGR 1E 1841-045: Swift-BAT refined analysis
  56. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  57. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  58. Fermi GBM detection of an SGR-like burst
  59. Swift-BAT refined analysis of outburst from 1E 1841-04.5
  60. Fermi GBM detection of a burst from 1E 1841-045
  61. SGR-like outburst from the magnetar 1E 1841-04.5
  62. GRB 110112B: A short GRB detected by INTEGRAL
  63. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  64. GRB 100316D: Pre-burst emission measured by BAT
  65. GRB 090709A: Quasiperiodic variations in the BAT light curve
  66. XRF 090702: Swift-XRT refined analysis
  67. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  68. SGR J1550-5418
  69. IBAS Alert N. 5442 is not a GRB
  70. Suzaku ToO Observation of AXP 1E 1547.0-5408
  71. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  72. GRB 090111: Swift UVOT Upper Limits
  73. GRB 081222: Swift XRT refined analysis
  74. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  75. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  76. GRB080818B: GLAST Burst Monitor detection
  77. GRB 080520: Swift XRT Refined Analysis
  78. GRB 080205: Swift XRT refined analysis
  79. GRB 080121: Upper limit on X-ray afterglow
  80. GRB080120: Swift XRT position
  81. Swift XRT follow-up observations of GRB071008
  82. GRB 071003: XRT refined analysis
  83. GRB 070729: Swift-XRT refined analysis
  84. GRB 070520B: Swift-XRT refined analysis
  85. GRB 070520A: Swift-XRT refined analysis
  86. GRB070107: Swift/XRT refined analysis
  87. GRB061222B: Swift-XRT Refined Analysis
  88. GRB061025: Swift XRT refined analysis
  89. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  90. GRB 060729: An update on the late-time Swift observations
  91. GRB 060926: Swift XRT refined analysis
  92. Two bright bursts from SGR 1806-20 detected with IBAS
  93. GRB060213: Swift XRT observations and possible afterglow candidate
  94. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  95. Swift XRT Observation of GRB 060204C
  96. GRB060203: Swift XRT Team Refined Analysis
  97. Possible GRB 050922 detected by INTEGRAL
  98. GRB 050716: Refined XRT analysis.
  99. GRB 050509B: Swift/XRT refined analysis
  100. GRB 050502 - A long GRB detected with INTEGRAL

Advanced

Download all Circulars as a .tar.gz archive:
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov