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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"

2794 results found.

  1. Swift Trigger 457076: a possible GRB
  2. GRB 110708A: Konkoly observations
  3. GRB 110709B: Swift/UVOT Detection of Possible Optical Flaring
  4. GRB 110709B : A possible source in USNO B 1.0
  5. GRB 110709B: possible quiescent source in DSS
  6. GRB 110708A: Liverpool Telescope observations
  7. GRB 110708A: Lick observations
  8. GRB 110625A, the review of the sky area in plate archives
  9. Swift Trigger 456659 is probably not astrophysical
  10. GRB 110625A: 1.23m CAHA I-band observations
  11. IPN triangulation of GRB110618A (long duration, extremely intense)
  12. GRB 110604A: Suzaku WAM observation of the prompt emission
  13. GRB 110530A: optical observations in Mondy observatory
  14. GMRT detection of GRB 110328A
  15. GRB 110503A optical observation
  16. GRB 110503A optical observations
  17. GRB 110428A : Swift-XRT observations
  18. GRB 110422A: correction to the GCN circ. 11958
  19. GRB 110414A: GROND upper limits
  20. GRB 100407A : Errata of afterglow position in GCN 11899
  21. GRB 110406A: An exceptionally bright burst detected by INTEGRAL SPI-ACS
  22. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  23. GRB 110328A / Swift J164449.3+573451: BAT refined analysis
  24. GRB 110213A, the review of the sky area in plate archives
  25. GRB 110328A / Swift J164449.3+573451: NOT optical observations.
  26. GRB 110318B: Swift detection of a burst
  27. GRB 110305A: REM detection of a possible NIR afterglow
  28. IBAS distribution of coordinates for low significance INTEGRAL GRB triggers
  29. GRB 101225A, the review of the sky area in plate archives
  30. OT 110215: possible GRB from 2MASS J00264184+8324093
  31. GRB 110213B: Possible Host Galaxy in SDSS Stripe 82 Imaging
  32. GRB 110213B: P60 Optical Afterglow Candidate
  33. GRB 110206A: SMARTS optical/IR afterglow candidate observations
  34. GRB 101225A is likely at z~0
  35. GRB 110205A: Possible Lick/Kast redshift
  36. GRB 101224A, the review of the sky area in plate archives
  37. GRB 101219B: GROND detection of a SN signature
  38. GRB 101219B: correction
  39. New feature in Fermi GBM GRB Ground Position Notices
  40. GRB 110112A: WHT candidate afterglow/host galaxy
  41. GRB 110112A: Swift detection of a possible short burst
  42. GRB 101219b. Possible radio afterglow detection.
  43. GRB 110106B: Gemini-North / WHT detection of a fading afterglow
  44. GRB 101225: Optical follow-up of the Christmas burst
  45. GRB 101225A: Swift-XRT refined Analysis
  46. Trigger 441015: Swift detection of a possible burst or transient
  47. GRB 101224A: Swift detection of a short burst
  48. Redshift solution(s) for GRB101213A from Swift-XRT data
  49. GRB 101204A Afterglow Candidate, VATT Observations
  50. IPN Localization of GRB101130 (possible short duration burst)
  51. GRB101030A
  52. Optical observation of GRB 101024A
  53. GRB 101117B: Swift-BAT refined analysis
  54. Possible detection of INTEGRAL burst GRB 101112A by the EVLA
  55. GRB 090113, the review of the sky area in plate archives
  56. GRB 101030A: Swift-BAT refined analysis
  57. GRB 101030A: Swift detection of a burst
  58. GRB 090111, the review of the sky area in plate archives (1976-1996)
  59. GRB 101008A: correction to the GCN 11352
  60. GRB 101017A: Swift detection of a burst with optical counterpart
  61. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  62. GRB 101008A: MASTER prompt optical observations
  63. GRB 101008A: SAO RAS optical observations
  64. GRB 100924A: Fermi GBM observation
  65. GRB 100925A / MAXI J1659-152: Optical observation with the Kottamia 188cm telescope
  66. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  67. GRB 100915A: Correction to Swift-BAT refined analysis
  68. GRB 100901A: errata of GRB name in GCN 11270
  69. GRB 100905A: UKIRT zJHK Observation
  70. GRB 100901A: Possible WSRT Radio Detection
  71. Optical observations of GRB 100901A
  72. GRB 100902A: GROND observations; afterglow candidate
  73. GRB 100901A: optical observation at Mt.Terskol
  74. GRB 100816A: 10.4-m GTC redshift confirmation
  75. GRB 100816A: VLT and Gemini-N revised redshift
  76. GRB 100816A : Lulin r'-band observation
  77. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  78. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  79. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening
  80. GRB 100805A: Swift-BAT refined analysis
  81. Trigger 430975: Swift detection of a possible burst
  82. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  83. GRB 100802A: Liverpool Telescope observations
  84. GRB 100802A: Possible Swift/UVOT Detection of Optical Afterglow
  85. GRB 100728A, Swift-BAT refined analysis
  86. GRB 100728B: Swift detection of a burst with an optical counterpart
  87. GRB 100727A: Swift detection of a burst
  88. GRB 100725B: refined XRT analysis
  89. GRB 100713A: optical observation in Maidanak
  90. GRB 100628A: Keck/LRIS Spectroscopy of Host Galaxy Candidate
  91. GRB 100628A: Near-IR sources coincident with the possible X-ray afterglow
  92. GRB 100628A: Swift XRT/UVOT refined analysis
  93. GRB 100615A: Additional Gemini/NIRI observations
  94. GRB 100702A, Swift-BAT refined analysis
  95. GRB 100628A: GROND optical/NIR observations of the host candidate
  96. GRB100625A: GROND confirmation of constant source
  97. GRB100628A: RTT150 optical observations
  98. GRB 100628A: Swift XRT detection of a possible X-ray afterglow
  99. GRB 100628A: INTEGRAL SPI-ACS light curve
  100. GRB 100621A: Swift/UVOT observations

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