Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

4269 results found.

  1. IPN Triangulation of GRB 111222A (short/hard/intense)
  2. GRB 111215A: EVLA observations
  3. GRB111215A: CARMA Detection
  4. GRB 111103B: optical upper limit
  5. GRB 111215A: Enhanced Swift-XRT position
  6. GRB 111215A: Swift detection of a burst
  7. GRB 111129A: Swift/UVOT Detection
  8. GRB 111129A: Swift detection of a burst with an optical counterpart
  9. GRB 111126A found in ground analysis of BAT data
  10. GRB 111022B: MASTER OT observations
  11. GRB 111029A: SAO RAS optical limits
  12. GRB111029A: MITSuME Ishigakijima Optical Upper Limits
  13. GRB 111029A: PAIRITEL NIR Upper Limits
  14. GRB 111029A: optical upper limit
  15. GRB 111026A: Swift detection of a burst
  16. GRB 111022A: MASTER-Net early limit
  17. GRB 110825A: GROND Observations
  18. GRB 110924A: Swift detection of a possible burst
  19. GRB110918A: Lick Observations
  20. GRB 110918A: INT optical detection of Swift candidate afterglow
  21. Swift detection of short bursts from PSR J1647-4552
  22. GRB 110915A: MITSuME Akeno Optical upper limits
  23. GRB 110905A / X-ray transient MAXI J1836-194: TNT optical observation
  24. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  25. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  26. Swift detection of an SGR burst from Swift J1834.9-0846
  27. Swift-BAT Trigger 501485 is noise
  28. GRB 110818A, Swift-BAT refined analysis
  29. SGR 1834.9-0846/ GRB 110807A, I-band observations
  30. SGR 1834.9-0846/ GRB 110807A: archival IR observations
  31. SGR J1834.9-0846: A Neutron Star in W41?
  32. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  33. Fermi GBM detection of a SGR-like burst
  34. GRB 110807A: Swift detection of a burst or a posible new SGR
  35. GRB 110726A: two epochs of SAO RAS optical observations
  36. GRB 110801A: MASTER OT observations
  37. AXP 4U 0142+61: Fermi GBM detection
  38. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  39. GRB 110719A: GRT Optical Observation
  40. GRB 110719A: optical limit by "Pi of the Sky"
  41. Swift J1822.3-1606
  42. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  43. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  44. GRB 110709B: Preliminary Swift-BAT refined analysis
  45. GRB 110709B: Swift detection of a burst
  46. GRB 110709A: MASTER-NET optical observations
  47. GRB 110709A: Swift detection of a burst
  48. Swift trigger 456780 is not a burst
  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. SGR 1E 1841-045: Swift-BAT refined analysis
  53. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  54. GRB 110529A: Suzaku WAM observation of the prompt emission
  55. GRB 110530A: Swift-XRT refined Analysis
  56. GRB 110529A: Fermi GBM detection
  57. LAT Observations of GRB110529A
  58. GRB 110520A: MASTER-NET optical observations
  59. GRB 110519A: Swift detection of a burst
  60. GRB 110412A: Swift-BAT refined analysis
  61. GRB 110411A: MASTER prompt and follow-up optical limits
  62. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  63. GRB 110328A / Swift J164449.3+573451: VLBA Observations
  64. GRB 110406A: Positional coincidence with NGC 404
  65. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  66. GRB 110402A afterglow observation
  67. GRB 110402A: MITSuME Okayama and Ishigakijima Optical upper limits
  68. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  69. GRB 110328A / Swift J164449.3+573451: Mondy optical observations
  70. GRB 110328A / Swift J164449.3+573451: BAT refined analysis
  71. GRB 110328A / Swift J164449.3+573451: Konkoly observations
  72. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Upper Limits
  73. GRB 110328B: Fermi-LAT Detection
  74. GRB 110328B: Fermi GBM detection
  75. GRB 110301A: Fermi GBM detection
  76. Fermi GBM detection of an SGR-like burst
  77. GRB 110213A: YNAO-GMG Observations
  78. GRB 110213B: MAXI/GSC refined analysis
  79. GRB 110213A: Swift detection of a burst with optical afterglow
  80. GRB 110208A: Potential afterglow from Magellan
  81. SGR-like outburst from the magnetar 1E 1841-04.5
  82. GRB 110205A: Lightbuckets Optical Observations
  83. GRB110205A: MITSuME Ishigakijima Optical Observation
  84. GRB 110205A: Swift-BAT refined analysis
  85. GRB 110112A: MASTER optical observations
  86. GRB 110112A: Swift detection of a possible short burst
  87. Short GRB 110106A: MASTER OT observations
  88. GRB 101219A: Swift detection of a short hard burst
  89. GRB 101129A : Suzaku WAM observation of the prompt emission
  90. GRB 101204A detected in ground analysis of BAT data
  91. GRB101030A
  92. Swift detection of MAXIJ1409-619
  93. Fermi GBM detection of a burst from a galactic source
  94. GRB 10112A: MASTER optical observations
  95. GRB 090113, the review of the sky area in plate archives
  96. GRB 101030A: Swift detection of a burst
  97. GRB 100728B: X-shooter redshift
  98. GRB100906A: Optical observations at IAO
  99. GRB 100901A: Faulkes Telescope North afterglow candidate
  100. GRB100807A: R band observations

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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