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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"

2744 results found.

  1. GRB 111228A: Possible host detected by Swift/UVOT
  2. GRB 120116A, the review of the sky area in plate archives
  3. GRB 120121A: Swift-XRT position
  4. GRB 120102A, the review of the sky area in plate archive
  5. GRB 110915B, the review of the sky area in plate archives
  6. GRB 111225A, the review of the sky area in plate archives
  7. GRB 111222A, the review of the sky area in plate archives
  8. GRB 111211A: Detection of the SN with the 10.4m GTC
  9. GRB 120102A: Swift-BAT refined analysis
  10. GRB 110915A, the review of the sky area in plate archives
  11. GRB 111229A: Swift detection of a burst
  12. GRB 111228A: Possible host galaxy in the SDSS arhive
  13. GRB 111225A: Swift-XRT refined Analysis
  14. GRB 111205A: Confirmation of X-ray Afterglow
  15. Possible detection of pre-trigger X-ray emission from GRB 111215A by MAXI/GSC
  16. GRB 111215A: Swift-BAT refined analysis
  17. GRB 111201A, the review of the sky area in plate archive
  18. GRB 111209A: VLT/X-shooter redshift
  19. GRB 111205A: GROND observations
  20. GRB 111123A: optical upper limit in CrAO: correction to the GCN circ. 12613
  21. GRB 111123A, Swift-BAT refined analysis
  22. GRB 111123A: TNG NIR detection of the afterglow candidate
  23. GRB 111117A, the review of the sky area in plate archives
  24. GRB 111117A: TNG observations
  25. GRB111107A: Further ATCA observations - no detection
  26. GRB111107A: ATCA observations - upper limit and a possible detection
  27. GRB 111109A: Swift-BAT refined analysis
  28. GRB 111107A: Swift-BAT refined analysis
  29. GRB 111103B : WIYN 3.5m NIR observations
  30. GRB 111022B: BTA Optical Observations
  31. GRB 111020A Spectral lag analysis
  32. GRB 110918A: Optical light curve for days 1.4 to 16.3
  33. GRB 111016A: Swift-BAT refined analysis
  34. GRB 111016A: P60 Afterglow Candidate
  35. GRB 111016A: Swift detection of a burst
  36. GRB 111005A: EVLA Observations
  37. GRB 110924A: Swift detection of a possible burst
  38. GRB 110918A optical observation
  39. GRB 110903A: Suzaku WAM observation of the prompt emission
  40. GRB 110825A: Further Swift/XRT Observations
  41. MAXI J1836-194 (originally GRB 110905A): Swift-BAT refined analysis
  42. GRB 110905A: Potential BAT trigger on MAXI J1836-194
  43. Trigger 502024: Swift detection of KS 1741-293
  44. GRB110825A: Fermi GBM observation
  45. GRB 110825A: GMG optical observation
  46. GRB 110825A: field inspection and possible host galaxy
  47. GRB 110820A, the review of the sky area in plate archives
  48. IPN triangulation of GRB 110820B (very long duration, extremely intense)
  49. IPN triangulation of GRB110802A (short/hard burst)
  50. GRB 110715A optical observations
  51. Swift Trigger 457076: a possible GRB
  52. GRB 110708A: Konkoly observations
  53. GRB 110709B: Swift/UVOT Detection of Possible Optical Flaring
  54. GRB 110709B : A possible source in USNO B 1.0
  55. GRB 110709B: possible quiescent source in DSS
  56. GRB 110708A: Liverpool Telescope observations
  57. GRB 110708A: Lick observations
  58. GRB 110625A, the review of the sky area in plate archives
  59. Swift Trigger 456659 is probably not astrophysical
  60. GRB 110625A: 1.23m CAHA I-band observations
  61. IPN triangulation of GRB110618A (long duration, extremely intense)
  62. GRB 110604A: Suzaku WAM observation of the prompt emission
  63. GRB 110530A: optical observations in Mondy observatory
  64. GMRT detection of GRB 110328A
  65. GRB 110503A optical observation
  66. GRB 110503A optical observations
  67. GRB 110428A : Swift-XRT observations
  68. GRB 110422A: correction to the GCN circ. 11958
  69. GRB 110414A: GROND upper limits
  70. GRB 100407A : Errata of afterglow position in GCN 11899
  71. GRB 110406A: An exceptionally bright burst detected by INTEGRAL SPI-ACS
  72. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  73. GRB 110328A / Swift J164449.3+573451: BAT refined analysis
  74. GRB 110213A, the review of the sky area in plate archives
  75. GRB 110328A / Swift J164449.3+573451: NOT optical observations.
  76. GRB 110318B: Swift detection of a burst
  77. GRB 110305A: REM detection of a possible NIR afterglow
  78. IBAS distribution of coordinates for low significance INTEGRAL GRB triggers
  79. GRB 101225A, the review of the sky area in plate archives
  80. OT 110215: possible GRB from 2MASS J00264184+8324093
  81. GRB 110213B: Possible Host Galaxy in SDSS Stripe 82 Imaging
  82. GRB 110213B: P60 Optical Afterglow Candidate
  83. GRB 110206A: SMARTS optical/IR afterglow candidate observations
  84. GRB 101225A is likely at z~0
  85. GRB 110205A: Possible Lick/Kast redshift
  86. GRB 101224A, the review of the sky area in plate archives
  87. GRB 101219B: GROND detection of a SN signature
  88. GRB 101219B: correction
  89. New feature in Fermi GBM GRB Ground Position Notices
  90. GRB 110112A: WHT candidate afterglow/host galaxy
  91. GRB 110112A: Swift detection of a possible short burst
  92. GRB 101219b. Possible radio afterglow detection.
  93. GRB 110106B: Gemini-North / WHT detection of a fading afterglow
  94. GRB 101225: Optical follow-up of the Christmas burst
  95. GRB 101225A: Swift-XRT refined Analysis
  96. Trigger 441015: Swift detection of a possible burst or transient
  97. GRB 101224A: Swift detection of a short burst
  98. Redshift solution(s) for GRB101213A from Swift-XRT data
  99. GRB 101204A Afterglow Candidate, VATT Observations
  100. IPN Localization of GRB101130 (possible short duration burst)

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